Codes & Lookups
Look up codes and reference data: postal codes, country and currency codes, HTTP status codes, chemical elements and other standard tables. Enter a code or a name to see what it stands for.
46 tools
- UK Postcode Lookup Look up the place and region for any UK postcode or outward code.
- US ZIP Code Lookup Look up the city and state for any US ZIP code.
- Capital City to Country Find which country a capital city belongs to, with its dialing code and currency.
- Turkey License Plate Code Lookup Enter a Turkish license plate code (1–81) to find which province it belongs to.
- Country Info & Dialing Code Lookup Select a country to see its international dialing code, capital city and currency.
- Turkey Telephone Area Code Lookup Look up the landline telephone area code for any province in Turkey.
- Currency to Country Find which countries use a given ISO currency code (e.g. EUR, JPY).
- Turkey Postal Code Lookup Select a province and district to list the postal codes of its neighborhoods (Turkey and Northern Cyprus).
- NATO Phonetic Alphabet Converter Convert any text into the NATO phonetic alphabet (Alfa, Bravo, Charlie...).
- Capital City of a Country Look up the capital city of any country, along with its international dialing code.
- Dialing Code to Country Find which country or countries use a given international dialing code (e.g. +90).
- HTTP Status Code Lookup Enter an HTTP status code (like 200, 301, 404, or 500) to instantly see its standard reason phrase and which category it belongs to — informational, success, redirection, client error, or server error.
- Dialing Code to Country Info Reverse-look up the country, capital and currency for an international dialing code.
- Greek Alphabet Lookup Look up a Greek letter by its position (1–24), returning the upper- and lower-case symbols and the English name.
- IATA Airline Code Lookup Look up the two-letter IATA code and three-letter ICAO code for a major airline by name.
- Brevity Code Lookup Looks up the meaning of common multiservice air-combat brevity terms such as Fox Three, Bingo and Splash.
- Country Code to Name Lookup Looks up a country name from its ISO 3166-1 alpha-2 or alpha-3 code.
- Fingerspelling Reference Spells out any word into American Sign Language fingerspelling, giving the handshape description for each letter.
- Plant Hardiness Zone Lookup Looks up the average annual minimum temperature for a USDA plant hardiness zone (1-13) in both Fahrenheit and Celsius.
- Element by Number Lookup Looks up the chemical element name, symbol and atomic mass for a given atomic number.
- Paper Size Calculator Look up the precise dimensions of ISO A-series paper sizes (A0 through A6). See each format's width and height in millimeters, inches, and pixels at 150 DPI — handy for printing, design, and document setup.
- AWG to mm² Wire Size Converter Convert American Wire Gauge (AWG) to cross-sectional area in mm² and back, with conductor diameter.
- Maritime Signal Flag Lookup Look up the International Code of Signals meaning and NATO phonetic name for any single-letter maritime signal flag.
- HTTP Status Phrase to Code Lookup Reverse-looks up the numeric HTTP status code and its class from a reason phrase such as "Not Found" or "Bad Gateway".
- Language Code to Name Converter Looks up the language name for an ISO 639-1 two-letter code (e.g. en → English) or finds the code for a language name, in either direction.
- Element by Symbol Lookup Look up a chemical element from its periodic-table symbol, or find the symbol for an element name, with its atomic number.
- Q Code Lookup Look up the plain-language meaning of an amateur radio Q code such as QTH, QSL or QRZ.
- Language Name to Code Converter Converts a language name to its ISO 639-1 two-letter code and back, for around 50 common languages.
- Screw Gauge Lookup Calculator Converts a US screw gauge number to its major diameter in inches and millimeters using diameter = 0.060 + 0.013 × gauge.
- IATA to ICAO Airport Code Converter Converts between 3-letter IATA and 4-letter ICAO airport codes for major international airports, in either direction.
- ASCII Table Reference Calculator Look up any ASCII character from its decimal code, or find the code, hex and binary of a character. Bidirectional.
- Greek Letter Lookup Looks up Greek letters by name or symbol, returning the lowercase and uppercase forms plus a common mathematical or scientific use.
- ccTLD Lookup Look up which country a country-code top-level domain (ccTLD) belongs to, or find a country's domain extension.
- Paper Size Lookup Calculator Look up the exact dimensions of any standard paper size (A0–A8, B0–B5, US Letter, Legal, Tabloid) in millimeters and inches, with aspect ratio.
- NATO Phonetic Alphabet Lookup Convert any letter to its NATO phonetic spelling word (A = Alfa, B = Bravo) or look up which letter a NATO word stands for.
- Resolution Standard Lookup Looks up a display resolution standard by name or by pixel dimensions, with megapixels and aspect ratio.
- ISO Country Numeric Code Lookup Look up the ISO 3166-1 numeric code, alpha-3 code, and country name from a two-letter ISO alpha-2 country code.
- City to IATA Code Converter Convert a major city name to its primary airport IATA code, or an IATA code back to its city. Covers about 50 of the world's busiest hubs.
- Currency Code to Name Converter Looks up the full currency name for an ISO 4217 code (USD → US Dollar) or finds the code for a currency name. Works both directions for ~50 major currencies.
- Element Properties Lookup Looks up a chemical element by symbol, name or atomic number and returns its atomic mass, group and period.
- Element Symbol to Name Lookup Looks up the full element name, atomic number and atomic mass from a chemical symbol such as Fe or Na.
- Shoe Size to Length Converter Converts between US men's shoe size and foot length in millimeters, centimeters and inches using the Brannock relationship.
- Battery Size Lookup Look up the voltage, physical dimensions, and common chemistry for standard battery codes like AA, 9V, CR2032 and 18650.
- Drill Bit Size Lookup Look up the diameter in inches and millimetres of a number-gauge or letter-designated drill bit.
- EtherType Lookup Looks up the protocol name for an Ethernet EtherType value, entered in hexadecimal, with or without the 0x prefix (0x0800 or 0800).
- MIME Type to Extension Lookup Looks up the file extension for a MIME type, or the MIME type for an extension, using a table of common types.