Reference tables

Static, sourced tables you can filter in place. Each page says where the data comes from and when it was last checked.

• HTTP status codes: the complete listEvery registered HTTP status code from 100 to 511 with its name, RFC and a one-line meaning, from the IANA registry. Search the table by code or keyword.1 table · Data last checked 2026-09-20
• File extensions and MIME types120 common file extensions with their type, MIME type, the programs that open them and notes on converting them, from HEIC and WebP to MKV, OPUS and DOCX.1 table · Data last checked 2026-09-20
• Country codes and international calling codesSearchable table of ISO 3166-1 alpha-2 and alpha-3 country codes with international dialling codes for all 193 UN member states plus observers and territories.2 tables · Data last checked 2026-09-20
• Unit conversion tables with live convertersExact conversion factors for length, mass, volume, area, temperature and data sizes (KB vs KiB, MB vs MiB), with a live converter for each section. No sign-up.6 tables · Data last checked 2026-09-20
• Paper and photo sizes: mm, inches and pixelsA, B and US paper sizes in mm, inches and pixels at 72, 150 and 300 dpi, plus passport photo sizes (US 2×2 in, UK/EU 35×45 mm, Canada 50×70 mm) in pixels.5 tables · Data last checked 2026-09-20