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Country Code Lookup Tool

Search for ISO 3166 codes, international dialing prefixes, and top-level domains (TLDs) for over 240 countries.

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Category References & Tables
Country ISO-2 ISO-3 Num Dial TLD
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About

Standardization is the backbone of global data exchange. Whether for configuring shipping APIs, validating phone numbers, or setting up international databases, developers and logistics managers need accurate Country Codes. This tool provides a unified reference for ISO 3166-1 alpha-2, alpha-3, numeric codes, and ITU-T calling prefixes.

Misidentifying a country code can lead to failed API requests, lost shipments, or routing errors in telecommunications. This database ensures 100% compliance with current international standards.

iso-codes dialing-codes data international reference

Formulas

While not a mathematical calculation, the relationship between these codes is a strict 1:1 mapping in relational databases.

Country ↔ {
ISO2 (Alpha-2)ISO3 (Alpha-3)Codephone (Dialing)

Reference Data

Country NameISO-2ISO-3DialTLD
United StatesUSUSA+1.us
United KingdomGBGBR+44.uk
GermanyDEDEU+49.de
JapanJPJPN+81.jp
BrazilBRBRA+55.br
ChinaCNCHN+86.cn
IndiaININD+91.in
AustraliaAUAUS+61.au

Frequently Asked Questions

Alpha-2 (2 letters) is the most widely used code, found in TLDs (.us, .uk) and IBANs. Alpha-3 (3 letters) allows for more combinations and is often used in machine-readable passports and UN documents.
The North American Numbering Plan (NANP) covers the US, Canada, and several Caribbean nations, all sharing the "+1" prefix. The differentiation happens at the area code level.
Generally, yes. However, when countries split (e.g., Sudan/South Sudan) or change names (e.g., Turkey to TΓΌrkiye), new codes are issued by the ISO maintenance agency.