HTTP · ISO · IATA · IANA · GS1 · NATO
Every code you look up, filed on one desk.
Status codes, countries, currencies, languages, airports, ports, time zones, barcodes and more — 2,372 entries from the official registries, searchable in one place.
Instant, client-side, keyboard-friendly — ↑ ↓ to move, Enter to open.
The collections
Front page · indexHTTP Status Codes
Every response code the web can send — from 100 Continue to 511 Network Authentication Required — with plain-English meanings.
Country Codes
All 250 ISO 3166-1 entries: alpha-2, alpha-3 and numeric codes, plus dialing codes, internet TLDs and capitals.
Currency Codes
Every active ISO 4217 currency: three-letter code, numeric code, minor units and the countries that use it.
Language Codes
The two-letter codes behind every lang attribute, locale and translation file — all 183 ISO 639-1 languages.
Airport Codes
IATA and ICAO codes for the world's major international airports — the letters on your boarding pass and baggage tag.
Port Numbers
The well-known and notable TCP/UDP ports every developer and admin meets: SSH, DNS, HTTPS, databases, mail and more.
Time Zone Abbreviations
CET, EST, IST, JST and the rest — the world's time-zone abbreviations with their UTC offsets and where they apply.
NATO Phonetic Alphabet
Alfa to Zulu, plus digits — the international radiotelephony spelling alphabet, with Morse code for good measure.
Vehicle Registration Codes
The oval bumper stickers: D for Germany, CH for Switzerland, RA for Argentina — international vehicle registration codes.
GS1 Barcode Prefixes
The first digits of every EAN barcode tell you which GS1 organization issued it — from 400–440 Germany to 978 for books.
HS Customs Chapters
The 96 chapters of the Harmonized System — the classification behind every customs declaration and tariff line in world trade.
Ask the Desk
An AI reference assistant grounded in this directory. Bring your own Anthropic API key — it never leaves your browser, and we never see it.