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Free Online Calculators, Converters & Dev Tools | Tejji
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Document
robots.txt
# robots.txt - AI Bot & Crawler Management # Strategy: Allow search engines and AI search (brings human traffic), throttle AI training crawlers # ============================================================================= # SEARCH ENGINES - Full Access (Bring Human SEO Traffic) # ============================================================================= User-agent: Googlebot Allow: / # Crawl-delay: 0.1 # Block IPv6 wildcard search URLs — thin content (near-identical template pages) # Disallow: /ip/search/ # Disallow: /ip/ip-to-location/ # Disallow: /seo/keyword-tool/ User-agent: Bingbot Allow: / Crawl-delay: 0.5 User-agent: Baiduspider Allow: / Crawl-delay: 2 # ============================================================================= # AI SEARCH ENGINES - Allowed with Moderate Delay (Bring Human Referrals) # These can drive traffic when users ask questions and get linked to your site # ============================================================================= User-agent: Applebot # Apple AI Search / Siri Allow: / Crawl-delay: 3 User-agent: PerplexityBot # Perplexity AI Search Allow: / Crawl-delay: 3 User-agent: OAI-SearchBot # OpenAI SearchGPT Allow: / Crawl-delay: 3 User-agent: DuckAssistBot # DuckDuckGo AI Assistant Allow: / Crawl-delay: 3 # ============================================================================= # AI ASSISTANTS - Allowed with Delay (Direct User Queries) # These are users asking questions through ChatGPT, Claude, etc. # ============================================================================= User-agent: ChatGPT-User # ChatGPT web browsing Allow: / Crawl-delay: 2 User-agent: Perplexity-User # Perplexity user queries Allow: / Crawl-delay: 2 User-agent: Claude-User # Claude user queries Allow: / Crawl-delay: 2 User-agent: Meta-ExternalFetcher # Meta AI user queries Allow: / Crawl-delay: 2 User-agent: MistralAI-User # Mistral user queries Allow: / Crawl-delay: 2 # ============================================================================= # SEO SCRAPERS - HEAVILY THROTTLED (No Human Traffic Value) # These bots scrape for SEO/analytics tools - no direct visitor referrals # ============================================================================= User-agent: SemrushBot # Semrush SEO tool crawler Crawl-delay: 60 # Very slow - purely for their commercial SEO tool User-agent: DotBot # Moz/OpenSiteExplorer Crawl-delay: 60 # Very slow - SEO link analysis only User-agent: AhrefsBot # Ahrefs SEO tool Crawl-delay: 60 # Very slow - backlink analysis tool User-agent: MJ12bot # Majestic SEO crawler Crawl-delay: 60 # Very slow - link intelligence User-agent: DataForSeoBot # DataForSEO API crawler Crawl-delay: 60 User-agent: BLEXBot # WebMeUp backlink crawler Crawl-delay: 60 User-agent: seoscanners # Generic SEO scanner Crawl-delay: 60 User-agent: SiteAuditBot # SEMrush Site Audit Crawl-delay: 60 User-agent: SEOkicks # SEOkicks link research Crawl-delay: 60 # ============================================================================= # AI TRAINING CRAWLERS - BLOCKED or HEAVILY THROTTLED (No Human Traffic Value) # These only consume resources for AI model training without bringing users # ============================================================================= User-agent: Bytespider # ByteDance/TikTok - 540k requests! Crawl-delay: 30 # Heavy throttle instead of block (may still index) User-agent: GPTBot # OpenAI training crawler Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: Amazonbot # Amazon AI training Crawl-delay: 20 User-agent: PetalBot # Huawei AI training Crawl-delay: 20 User-agent: ClaudeBot # Anthropic training crawler Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: Claude-SearchBot # Anthropic search training Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: CCBot # Common Crawl (used by many AI companies) Allow: / # Allowed — monetized via Tollbit Crawl-delay: 15 User-agent: FacebookBot # Meta training crawler Crawl-delay: 20 User-agent: Meta-ExternalAgent # Meta general crawler Crawl-delay: 15 User-agent: Google-CloudVertexBot # Google AI training Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: Google-Extended # Google AI training Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: anthropic-ai # Anthropic variants Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: cohere-ai # Cohere AI Allow: / # Allowed — monetized via Tollbit Crawl-delay: 10 User-agent: Diffbot # Diffbot crawler Crawl-delay: 20 User-agent: ImagesiftBot # Image training Disallow: / User-agent: Omgilibot # Omgili crawler Disallow: / User-agent: Omgili # Omgili variant Disallow: / User-agent: YouBot # You.com crawler Crawl-delay: 10 # ============================================================================= # ARCHIVAL & RESEARCH - Allowed with Delay # ============================================================================= User-agent: archive.org_bot # Internet Archive - Wayback Machine Allow: / Crawl-delay: 5 User-agent: ia_archiver # Internet Archive variant Allow: / Crawl-delay: 5 # ============================================================================= # MISCELLANEOUS AI CRAWLERS - BLOCKED # ============================================================================= User-agent: Anchor Browser # Anchor AI Disallow: / User-agent: Timpibot # Timpi search Crawl-delay: 15 User-agent: ProRataInc # ProRata.ai Disallow: / User-agent: Novellum AI Crawl # Novellum Disallow: / # ============================================================================= # DEFAULT RULE - Moderate Crawl Delay for Unlisted Bots # ============================================================================= User-agent: * Crawl-delay: 2 Disallow: /dist/ Disallow: /wwwroot/ Disallow: /*.js$ Disallow: /*.css$ Disallow: /bin/ Disallow: /obj/ # Disallow: /ip/search/ # Disallow: /ip/ip-to-location/ # Disallow: /seo/keyword-tool/ # ============================================================================= # SITEMAP - Help Search Engines Index Your Content # ============================================================================= Sitemap: https://tejji.com/sitemap.xml
Document
llms.txt
# Tejji
> Free online tools — calculators, converters, IP tools, time/date utilities, and more. No sign-up required. All tools run client-side for privacy.
## About
Tejji provides 115+ free online tools across 8 categories. All tools work in the browser with no server round-trips for calculations. No account needed.
## Categories
### Finance Tools
- [Mortgage Calculator](/apps/mortgage-calculator): Calculate monthly mortgage payments with amortization
- [Loan EMI Calculator](/apps/loan-emi-calculator): Calculate monthly EMI with amortization schedule
- [Compound Interest Calculator](/apps/compound-interest-calculator): Calculate compound interest with monthly contributions
- [Investment Calculator](/apps/investment-calculator): Calculate SIP and lump sum investment returns
- [Retirement Calculator](/apps/retirement-calculator): Plan retirement with corpus projection and 4% rule
- [Future Value Calculator](/apps/future-value-calculator): Calculate future value of money
- [NPV Calculator](/apps/net-present-value-calculator): Calculate net present value of cash flows
- [Inflation Calculator](/apps/inflation-calculator): See how inflation erodes purchasing power
- [Salary Calculator](/apps/salary-calculator): Convert salary between hourly, weekly, monthly, annual
- [Tax Calculator](/apps/tax-calculator): Calculate US federal income tax with bracket breakdown
- [Sales Tax Calculator](/apps/sales-tax-calculator): Calculate sales tax for any US state
- [Tip Calculator](/apps/tip-calculator): Calculate tips, split bills, per-person totals
- [Percentage Calculator](/apps/percentage-calculator): Calculate percentages, % of, % change
- [APR to APY](/apps/apr-to-apy): Convert annual percentage rate to annual percentage yield
- [Money Converter](/apps/money-converter): Convert between currencies worldwide
- [Send Money](/apps/send-money): Compare exchange rates for international transfers
- [Invoice Generator](/apps/invoice-generator): Create professional invoices
### Math & Science Tools
- [Calculator](/apps/calculator): Basic and scientific calculator with history
- [Pythagorean Theorem](/apps/pythagoras-theorem): Find any side of a right triangle
- [Roman Numeral Converter](/apps/roman-numeral-converter): Convert between Arabic and Roman numerals
### Health Tools
- [BMI Calculator](/apps/bmi-calculator): Calculate Body Mass Index (imperial/metric)
- [Body Fat Calculator](/apps/body-fat-calculator): Estimate body fat using US Navy method
- [Calorie Calculator](/apps/calorie-calculator): Calculate daily calorie needs with BMR and TDEE
### Education Tools
- [GPA Calculator](/apps/gpa-calculator): Calculate GPA with courses and credit hours
- [Grade Calculator](/apps/grade-calculator): Calculate course grade with weighted assignments
### Developer Tools
- [JSON Formatter](/apps/json-formatter): Format, validate, and beautify JSON
- [Regex Tester](/apps/regex-tester): Test regular expressions in real-time
- [Hash Generator](/apps/hash-generator): Generate MD5, SHA-1, SHA-256, SHA-512 hashes
- [UUID Generator](/apps/uuid-generator): Generate random UUID v4 strings
- [Timestamp Converter](/apps/timestamp-converter): Convert Unix timestamps to dates
- [Cron Expression Builder](/apps/cron-expression-builder): Build cron schedule expressions
- [Base64 Encoder/Decoder](/apps/encode-decode-base64): Encode and decode Base64
- [HTML Encoder/Decoder](/apps/encode-decode-html): Encode and decode HTML entities
- [HTML to Text](/apps/html-to-text): Strip HTML tags, convert to plain text
- [URL Encoder/Decoder](/apps/url-encoder-decoder): Encode and decode URLs
- [Markdown Editor](/apps/markdown-editor): Edit Markdown with live preview
- [Meta Tag Generator](/apps/meta-tag-generator): Generate SEO meta tags
- [QR Code Generator](/apps/qr-code-generator): Generate QR codes for URLs and text
- [Password Generator](/apps/password-generator): Generate strong random passwords
- [Color Picker](/apps/color-picker): Pick colors, convert HEX/RGB/HSL
### Text & Utility Tools
- [Character Count](/apps/character-count): Count characters, words, sentences
- [Typo Generator](/apps/typo-generator): Generate typo combinations for domain research
- [Traffic Rank](/apps/traffic-rank): Check website traffic ranking
### Date Tools
- [Age Calculator](/apps/age-calculator): Calculate exact age with zodiac and milestones
- [Date Calculator](/apps/date-calculator): Calculate days between dates
- [What Day Is It](/apps/what-day-is-it): Find day of the week for any date
- [Lottery Number Generator](/apps/lottery-number-generator): Generate random lottery numbers
- [Pomodoro Timer](/apps/pomodoro-timer): Focus timer with work/break intervals
### Unit Converters
- [Temperature](/convert/temperature-conversion): Celsius, Fahrenheit, Kelvin
- [Length](/convert/length-conversion): Meters, feet, inches, miles
- [Mass/Weight](/convert/mass-conversion): Kilograms, pounds, ounces
- [Speed](/convert/speed-conversion): MPH, KPH, knots
- [Bytes/Data](/convert/bytes-conversion): Bytes, KB, MB, GB, TB
- [Number Systems](/convert/number-conversion): Decimal, binary, octal, hex
- [Angle](/convert/angle-conversion): Degrees, radians, gradians
- [Astronomical](/convert/astronomical-conversion): Light years, parsecs, AU
- [Frequency](/convert/frequency-conversion): Hertz, kilohertz, megahertz
- [Mileage/Fuel](/convert/mileage-conversion): MPG, km/L, L/100km
- [Metric](/convert/metric-conversion): Common metric and imperial units
- [Length Metric](/convert/length-metric-conversion): Metric length unit prefixes
- [Mass Metric](/convert/mass-metric-conversion): Metric mass unit prefixes
- Quick converters: [°C→°F](/convert/celsius-to-fahrenheit), [°F→°C](/convert/fahrenheit-to-celsius), [cm→in](/convert/cm-to-inches), [in→cm](/convert/inches-to-cm), [ft→m](/convert/feet-to-meters), [m→ft](/convert/meters-to-feet), [mm→in](/convert/mm-to-inches), [yd→m](/convert/yards-to-meters), [kg→lbs](/convert/kg-to-lbs), [lbs→kg](/convert/lbs-to-kg), [kg→oz](/convert/kg-to-oz), [oz→g](/convert/oz-to-g), [g→oz](/convert/g-to-oz), [kg→stone](/convert/kg-to-stone), [stone→kg](/convert/stone-to-kg), [km→mi](/convert/km-to-miles), [mi→km](/convert/miles-to-km), [kph→mph](/convert/kph-to-mph), [mph→kph](/convert/mph-to-kph), [KB→MB](/convert/kb-to-mb), [MB→GB](/convert/mb-to-gb), [GB→MB](/convert/gb-to-mb), [GB→TB](/convert/gb-to-tb)
### IP Tools
- [My IP Address](/ip/my-ip-address): See your public IP address
- [IP to Location](/ip/ip-to-location): Geolocate any IP address
- [Bulk IP Lookup](/ip/bulk-ip-lookup): Look up multiple IPs at once
- [IP to URL](/ip/ip-address-to-url): Reverse DNS lookup
- [URL to IP](/ip/url-to-ip-address): DNS resolution
- [IP to Number](/ip/ip-to-number): Convert IPv4 to decimal
- [IPv4 to IPv6](/ip/ipv4-to-ipv6-conversion): Address format conversion
- [Server Variables](/ip/ip-server-variables): View request headers
- [DNS Lookup](/ip/dns-lookup): Query DNS records
- [WHOIS Lookup](/ip/whois-lookup): Domain registration info
- [IP Blacklist Check](/ip/ip-blacklist-check): Check IP reputation
- [Subnet Calculator](/ip/subnet-calculator): Calculate subnets and CIDR
### Time & Date
- [World Clock](/time-date/world-clock): Time in cities worldwide
- [Current Time](/time-date/current-time): Current time in any city
- [Time Zone Conversion](/time-date/time-conversion): Convert between time zones
### Visa / Immigration
- [H1B Visa Data](/visa/h1b): H1B LCA data for companies
- [H1B Sponsors](/visa/h1b-sponsors): Search H1B sponsor companies
- [H1B Salary](/visa/h1b-salary): H1B salary data by job title
- [H1B Trends](/visa/h1b-trends): H1B filing trends over time
- [H1B Compare](/visa/h1b-compare): Compare H1B sponsors side by side
### Postal Codes
- [ZIP Codes](/zip-codes): Postal codes worldwide
- [India Pincode Finder](/zip-codes/pincode-finder): India postal code lookup
- [US ZIP Code Details](/zip-codes/us/{zip}): Detailed US ZIP code pages
- [India PIN Code Details](/zip-codes/india/{pin}): Detailed India PIN code pages
### SEO
- [Keyword Tool](/seo/keyword-tool): Search suggestions from search engines
## API
- Cities endpoint: `GET /api/location/cities?q={query}` — search ~80K cities worldwide
## Optional
- Full detail version: [/llms-full.txt](/llms-full.txt)
- Sitemap: [/sitemap.xml](/sitemap.xml)
Document
llms-full.txt
# Tejji — Full Tool Reference
> Free online tools — calculators, converters, IP tools, time/date utilities, and more.
> No sign-up required. All tools run client-side for privacy.
> This is the detailed version. See [/llms.txt](/llms.txt) for the concise version.
---
## Finance Tools
### Mortgage Calculator
- **URL**: /apps/mortgage-calculator
- **What it does**: Calculates monthly mortgage payments given loan amount, interest rate, and loan term. Shows full amortization schedule with principal/interest breakdown.
- **Inputs**: Loan amount (USD), annual interest rate (%), loan term (years)
- **Output**: Monthly payment, total interest, total cost, amortization table
- **Example query**: "What is the monthly payment on a $300,000 mortgage at 6.5% for 30 years?"
- **Slug pages**: /apps/mortgage-calculator/300000-6.5-30
### Loan EMI Calculator
- **URL**: /apps/loan-emi-calculator
- **What it does**: Calculates Equated Monthly Installment (EMI) for any loan. Common in India and Asia. Shows amortization schedule with pie chart.
- **Inputs**: Principal amount, annual interest rate (%), tenure (months)
- **Output**: EMI amount, total interest, total payment, amortization schedule
- **Example query**: "What is the EMI for a ₹10 lakh loan at 8.5% for 5 years?"
### Compound Interest Calculator
- **URL**: /apps/compound-interest-calculator
- **What it does**: Calculates compound interest with optional monthly contributions. Shows growth chart over time.
- **Inputs**: Principal, annual rate, years, monthly contribution, compounding frequency
- **Output**: Future value, total contributions, total interest earned, growth chart
### Investment Calculator
- **URL**: /apps/investment-calculator
- **What it does**: Calculates returns for both SIP (Systematic Investment Plan) and lump sum investments.
- **Inputs**: Investment amount, expected return rate, investment period
- **Output**: Maturity value, total investment, wealth gained
### Retirement Calculator
- **URL**: /apps/retirement-calculator
- **What it does**: Projects retirement corpus based on current savings, contributions, and expected returns. Uses 4% safe withdrawal rule.
- **Inputs**: Current age, retirement age, current savings, monthly contribution, expected return, inflation rate
- **Output**: Retirement corpus, safe annual withdrawal, monthly income in retirement
### Future Value Calculator
- **URL**: /apps/future-value-calculator
- **What it does**: Calculates the future value of a present sum at a given interest rate.
- **Inputs**: Present value, annual interest rate, number of years
- **Output**: Future value
### NPV Calculator
- **URL**: /apps/net-present-value-calculator
- **What it does**: Calculates Net Present Value of a series of future cash flows.
- **Inputs**: Discount rate, initial investment, cash flows per period
- **Output**: NPV, IRR
### Inflation Calculator
- **URL**: /apps/inflation-calculator
- **What it does**: Shows how inflation changes purchasing power over time using historical CPI data.
- **Inputs**: Amount, start year, end year
- **Output**: Adjusted amount, cumulative inflation percentage
### Salary Calculator
- **URL**: /apps/salary-calculator
- **What it does**: Converts salary between hourly, weekly, biweekly, monthly, and annual amounts.
- **Inputs**: Amount, from period, to period
- **Output**: Equivalent salary in target period
### Tax Calculator
- **URL**: /apps/tax-calculator
- **What it does**: Calculates 2024 US federal income tax with bracket breakdown.
- **Inputs**: Gross income, filing status, deductions
- **Output**: Effective tax rate, marginal rate, tax by bracket, take-home pay
### Sales Tax Calculator
- **URL**: /apps/sales-tax-calculator
- **What it does**: Calculates sales tax for any US state, showing combined state + local rates.
- **Inputs**: Purchase amount, state
- **Output**: Tax amount, total with tax, state rate, combined rate
### Tip Calculator
- **URL**: /apps/tip-calculator
- **What it does**: Calculates tip amount and splits the bill among multiple people.
- **Inputs**: Bill amount, tip percentage, number of people
- **Output**: Tip amount, total bill, per-person amount
### Percentage Calculator
- **URL**: /apps/percentage-calculator
- **What it does**: Three modes — "What is X% of Y", "X is what % of Y", "% change from X to Y".
- **Inputs**: Two numbers and calculation mode
- **Output**: Result with formula shown
### APR to APY Converter
- **URL**: /apps/apr-to-apy
- **What it does**: Converts Annual Percentage Rate to Annual Percentage Yield based on compounding frequency.
- **Inputs**: APR (%), compounding frequency
- **Output**: APY (%)
### Money Converter
- **URL**: /apps/money-converter
- **What it does**: Converts between world currencies using live exchange rates.
- **Inputs**: Amount, from currency, to currency
- **Output**: Converted amount, exchange rate
### Send Money Comparison
- **URL**: /apps/send-money
- **What it does**: Compares exchange rates and fees across international money transfer providers (Wise, Remitly, etc.).
- **Inputs**: Amount, from country, to country
- **Output**: Provider comparison table with rates, fees, speed
---
## Math & Science Tools
### Calculator
- **URL**: /apps/calculator
- **What it does**: Basic and scientific calculator with history. Supports standard arithmetic and scientific functions.
- **Inputs**: Mathematical expression
- **Output**: Result, calculation history
### Pythagorean Theorem Calculator
- **URL**: /apps/pythagoras-theorem
- **What it does**: Finds the missing side of a right triangle given two sides.
- **Inputs**: Two sides (a, b, or c)
- **Output**: Missing side, angles, area, step-by-step solution
### Roman Numeral Converter
- **URL**: /apps/roman-numeral-converter
- **What it does**: Converts between Arabic numbers and Roman numerals. Includes quiz mode.
- **Inputs**: Number or Roman numeral
- **Output**: Converted value with breakdown
---
## Health Tools
### BMI Calculator
- **URL**: /apps/bmi-calculator
- **What it does**: Calculates Body Mass Index. Supports imperial and metric units.
- **Inputs**: Weight (kg or lbs), height (cm or ft/in)
- **Output**: BMI value, category (underweight/normal/overweight/obese), BMI prime
### Body Fat Calculator
- **URL**: /apps/body-fat-calculator
- **What it does**: Estimates body fat percentage using the US Navy circumference method.
- **Inputs**: Gender, height, waist, neck, hips (women only)
- **Output**: Body fat %, fat mass, lean mass, category
### Calorie Calculator
- **URL**: /apps/calorie-calculator
- **What it does**: Calculates daily calorie needs based on BMR (Mifflin-St Jeor) and activity level.
- **Inputs**: Age, gender, weight, height, activity level, goal
- **Output**: BMR, TDEE, recommended calories, macronutrient split
---
## Unit Converters
All converters work instantly with no page reload. Enter a value and the result appears immediately.
### Temperature Conversion
- **URL**: /convert/temperature-conversion
- **Units**: Celsius, Fahrenheit, Kelvin, Rankine, Réaumur
- **Example**: "Convert 100 degrees Celsius to Fahrenheit" → 212°F
- **Slug pages**: /convert/temperature-conversion/100-celsius-to-fahrenheit
### Length Conversion
- **URL**: /convert/length-conversion
- **Units**: Meter, kilometer, mile, yard, foot, inch, centimeter, millimeter, nautical mile
- **Example**: "How many feet in 1 meter?" → 3.28084 ft
### Mass/Weight Conversion
- **URL**: /convert/mass-conversion
- **Units**: Kilogram, pound, ounce, gram, stone, ton (metric/US/UK)
- **Example**: "Convert 75 kg to pounds" → 165.347 lbs
### Speed Conversion
- **URL**: /convert/speed-conversion
- **Units**: km/h, mph, m/s, knots, Mach
- **Example**: "100 kph in mph" → 62.137 mph
### Bytes/Data Conversion
- **URL**: /convert/bytes-conversion
- **Units**: Byte, KB, MB, GB, TB, PB (binary and decimal)
### Number System Conversion
- **URL**: /convert/number-conversion
- **Systems**: Decimal, Binary, Octal, Hexadecimal
### Angle Conversion
- **URL**: /convert/angle-conversion
- **Units**: Degrees, radians, gradians, arcminutes, arcseconds
### Astronomical Conversion
- **URL**: /convert/astronomical-conversion
- **Units**: Light year, parsec, astronomical unit, kilometer, mile
### Frequency Conversion
- **URL**: /convert/frequency-conversion
- **Units**: Hertz, kHz, MHz, GHz, RPM
### Mileage/Fuel Conversion
- **URL**: /convert/mileage-conversion
- **Units**: MPG (US), MPG (UK), km/L, L/100km
### Metric Prefix Converters
- Length metric: /convert/length-metric-conversion — all SI length prefixes
- Mass metric: /convert/mass-metric-conversion — all SI mass prefixes
- General metric: /convert/metric-conversion — common metric↔imperial
---
## IP & Network Tools
### My IP Address
- **URL**: /ip/my-ip-address
- **What it does**: Shows your public IP address as seen by servers, with geolocation data from MaxMind GeoLite2.
### IP to Location
- **URL**: /ip/ip-to-location
- **What it does**: Geolocates any IP address showing city, region, country, ISP, coordinates on a map.
- **Slug pages**: /ip/ip-to-location/8.8.8.8
### DNS Lookup
- **URL**: /ip/dns-lookup
- **What it does**: Queries DNS records (A, AAAA, MX, NS, TXT, CNAME) for any domain.
- **Slug pages**: /ip/dns-lookup/google.com
### WHOIS Lookup
- **URL**: /ip/whois-lookup
- **What it does**: Retrieves domain registration information via WHOIS protocol.
- **Slug pages**: /ip/whois-lookup/google.com
### URL to IP Address
- **URL**: /ip/url-to-ip-address
- **What it does**: Resolves a domain name to its IP address(es).
### IP Address to URL
- **URL**: /ip/ip-address-to-url
- **What it does**: Performs reverse DNS lookup to find hostnames for an IP.
### Bulk IP Lookup
- **URL**: /ip/bulk-ip-lookup
- **What it does**: Look up geolocation data for multiple IP addresses at once.
### IP to Number
- **URL**: /ip/ip-to-number
- **What it does**: Converts IPv4 dotted-decimal to 32-bit integer and vice versa.
### IPv4 to IPv6
- **URL**: /ip/ipv4-to-ipv6-conversion
- **What it does**: Converts IPv4 addresses to IPv6 mapped format.
### Subnet Calculator
- **URL**: /ip/subnet-calculator
- **What it does**: Calculates network address, broadcast, host range from CIDR notation.
### IP Blacklist Check
- **URL**: /ip/ip-blacklist-check
- **What it does**: Checks if an IP is listed on common DNS blacklists (DNSBL).
---
## Time & Date Tools
### World Clock
- **URL**: /time-date/world-clock
- **What it does**: Shows current time across multiple cities with interactive time-bar visualization. Drag cities to reorder, set home city for offset calculation, day/night indicators.
- **Slug pages**: /time-date/world-clock/london, /time-date/world-clock/tokyo
### Current Time
- **URL**: /time-date/current-time
- **What it does**: Shows current time in any city worldwide with timezone details.
- **Slug pages**: /time-date/current-time/new-york
### Time Zone Conversion
- **URL**: /time-date/time-conversion
- **What it does**: Converts time between different time zones.
- **Slug pages**: /time-date/time-conversion/est-to-pst
---
## Visa & Immigration Tools
### H1B Visa Data
- **URL**: /visa/h1b
- **What it does**: Search and browse H1B LCA (Labor Condition Application) data filed with USCIS. Filter by company, job title, year.
### H1B Sponsors
- **URL**: /visa/h1b-sponsors
- **What it does**: Search for companies that sponsor H1B visas. See filing counts, approval rates.
- **Slug pages**: /visa/h1b-sponsors/google, /visa/h1b-sponsors/microsoft
### H1B Salary Data
- **URL**: /visa/h1b-salary
- **What it does**: View H1B salary data by job title with percentile distribution.
- **Slug pages**: /visa/h1b-salary/software-engineer
### H1B Trends
- **URL**: /visa/h1b-trends
- **What it does**: Visualize H1B filing trends over time with charts.
### H1B Compare
- **URL**: /visa/h1b-compare
- **What it does**: Compare H1B sponsors side by side — filings, salaries, approval rates.
---
## Postal Code Tools
### ZIP Codes Worldwide
- **URL**: /zip-codes
- **What it does**: Search postal codes for cities globally.
### India Pincode Finder
- **URL**: /zip-codes/pincode-finder
- **What it does**: Search and browse Indian postal codes (PIN codes) by city, district, or state.
### US ZIP Code Pages (155,000+ pages)
- **URL**: /zip-codes/us/{zip}
- **What it does**: Detailed page for each US ZIP code with city, county, state, coordinates, and nearby codes.
- **Example**: /zip-codes/us/10001 — New York, NY
### India PIN Code Pages (41,000+ pages)
- **URL**: /zip-codes/india/{pin}
- **What it does**: Detailed page for each India PIN code with post office, district, state, and nearby codes.
- **Example**: /zip-codes/india/110001 — New Delhi
---
## Developer Tools
### JSON Formatter
- **URL**: /apps/json-formatter
- **What it does**: Formats, validates, and beautifies JSON data with syntax highlighting and error reporting.
### Regex Tester
- **URL**: /apps/regex-tester
- **What it does**: Tests regular expressions in real-time with match highlighting. Shows capture groups.
### Hash Generator
- **URL**: /apps/hash-generator
- **What it does**: Generates cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) from text or files.
### UUID Generator
- **URL**: /apps/uuid-generator
- **What it does**: Generates random UUID v4 strings. Batch mode for multiple UUIDs. Validates existing UUIDs.
### Timestamp Converter
- **URL**: /apps/timestamp-converter
- **What it does**: Converts between Unix timestamps and human-readable dates. Shows live clock.
### Base64 Encoder/Decoder
- **URL**: /apps/encode-decode-base64
- **What it does**: Encodes and decodes Base64 strings with full Unicode support.
### QR Code Generator
- **URL**: /apps/qr-code-generator
- **What it does**: Generates QR codes for URLs, text, and other data. Download as PNG.
---
## API Endpoints
### City Search API
- **Endpoint**: `GET /api/location/cities?q={query}`
- **Description**: Search ~80,000 cities worldwide by name. Returns city name, country, timezone, coordinates.
- **Rate limit**: No authentication required. Reasonable use expected.
- **Response**: JSON array of city objects
---
## Technical Details
- **Stack**: ASP.NET Core, Vanilla TypeScript, Vite
- **Calculations**: All client-side (no server round-trips)
- **Privacy**: No user data stored or transmitted
- **PWA**: Installable as Progressive Web App
- **Accessibility**: Keyboard navigable, screen reader compatible
- **Mobile**: Responsive design, works on all screen sizes
## Links
- Concise version: [/llms.txt](/llms.txt)
- Sitemap: [/sitemap.xml](/sitemap.xml)
- Contact: [/home/contact](/home/contact)