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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minute“Internet country code” usually means a country-code top-level domain (ccTLD), such as .jp for Japan, .fr for France, or .ke for Kenya. Traditional ccTLDs use two-letter codes drawn from ISO 3166-1, but ISO country codes also serve many non-Internet purposes—and a code or domain suffix does not by itself establish that a place is a sovereign state.
What are Internet country codes?
In domain names, the term usually refers to country-code top-level domains, abbreviated ccTLDs. A top-level domain is the final label in a domain name: in example.fr, that label is .fr. ICANN describes ccTLDs as the top-level-domain category reserved for countries, territories, and geographic locations identified in the ISO 3166-1 Country Codes list.
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The traditional ASCII form is two letters, as in .jp, .fr, and .ke. Some country-code domains can also appear in scripts other than US-ASCII; these are internationalized domain names. ICANN’s ccTLD overview explains the category and its relationship to ISO 3166-1.
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Yes, in the conventional case: the two-letter ccTLD suffix is based on an ISO 3166-1 alpha-2 code. But ISO codes and ccTLDs are not interchangeable terms. ISO 3166 is a system for representing country names and subdivisions in multiple contexts; a ccTLD is a kind of top-level domain in the DNS.
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ISO codes are also used in areas such as postal services, passports, logistics, telecommunications, travel, and finance. Seeing a two-letter country code in one of those settings does not mean it is a domain suffix.
What does ISO 3166 cover?
ISO 3166 has three parts: Part 1 covers current country names and other listed areas; Part 2 covers subdivisions; and Part 3 covers non-current country names. Its code formats include alpha-2 (two letters), alpha-3 (three letters), and numeric-3 (three digits). The conventional basis for ccTLDs is the alpha-2 format, not the other formats.
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| ISO 3166 code type | Form | Relevance to domain names |
|---|---|---|
| Alpha-2 | Two letters | Conventional basis for traditional ccTLDs |
| Alpha-3 | Three letters | Not the conventional ccTLD form |
| Numeric-3 | Three digits | Not the conventional ccTLD form |
| Subdivision code | Country code plus up to three characters | Identifies a subdivision, rather than serving as the conventional country-code top-level domain form |
| Former-name code | Code for a non-current country name | Not the conventional ccTLD form |
ISO 3166’s scope is broader than sovereign states. ISO says Part 1 includes dependencies and other areas of particular geopolitical interest, and some legacy entries remain listed even though they do not meet the standard’s current definition of a country. Consequently, neither an ISO code nor an associated domain suffix is proof of sovereignty or international recognition. See ISO’s overview of ISO 3166 country codes.
Does every eligible code have a delegated domain?
No. Eligibility for a country-code top-level domain is distinct from the domain being delegated in the DNS or a registry being operated. IANA says the primary eligibility method is listing as a two-letter ASCII ISO 3166-1 alpha-2 code; eligibility can also arise through the IDN Fast Track process for internationalized domain names.
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IANA’s documented delegation or transfer process reviews the proposed manager’s technical and administrative competence, includes government review, and considers whether the proposal serves the local Internet community. ISO maintains the country-code list; IANA handles domain delegation and transfer processes. The two roles are related, but they are not the same. Details are available in IANA’s ccTLD delegation and transfer guidance.
What does a suffix such as .uk or .jp mean?
A suffix such as .jp identifies a ccTLD associated with a country, territory, or geographic location; it is not a complete statement about the person or organization using the domain. In particular, the suffix alone does not prove the registrant is physically located there, that the site is government-run, or that the associated place has a particular political status.
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Registration conditions are set locally and can differ from one ccTLD to another. Check the relevant registry’s current policy if you need to know who can register a name, what documentation may be required, or whether restrictions apply. A general definition cannot establish those details for every domain.
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For current ISO codes, use the ISO Online Browsing Platform, which ISO identifies as the source for current information and changes: ISO Online Browsing Platform. For whether a ccTLD is delegated and for delegation information, consult IANA’s relevant records and guidance. For registration eligibility and rules, consult the local ccTLD registry. These sources answer different questions: code listing, DNS delegation, and local registration policy should not be treated as one status.
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