#tld

Every top-level domain in the IANA root zone as an API — the authoritative list a registrar, domain validator or analytics tool needs. For each TLD: whether it is a country-code TLD (ccTLD), a generic TLD (gTLD) or an internationalized (IDN) domain, its A-label, its Unicode form (e.g. xn--p1ai resolves to .рф) and, for ccTLDs, the country it belongs to. Validate a TLD or whole domain, find a country's ccTLD, filter by type, search, or list the entire root zone. Sourced from IANA's official tlds-alpha-by-domain.txt and served from memory — always fast.

api.oanor.com/tld-api

Parse any hostname or URL with the Public Suffix List. Split a domain into its subdomain, registrable domain (eTLD+1) and public suffix (eTLD), or fetch just the suffix or just the registrable domain. Handles full URLs, internationalized (punycode) domains, IP addresses, multi-level suffixes like co.uk and com.au, and — when you ask for it — private suffixes such as github.io and s3 buckets. Built on an always-current Public Suffix List and served entirely in-memory, so responses are instant and the service is always available. Ideal for cookie and domain scoping, analytics attribution, email and link validation, security and anti-abuse, and devops tooling.

api.oanor.com/domain-api