#dns

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

Resolve DNS records — A, AAAA, MX, NS, TXT, CNAME, SOA, SRV, CAA, PTR — for any domain, fetch all common records in a single call, or run a reverse PTR lookup for an IPv4 address. Backed by Google DNS-over-HTTPS. Ideal for devops tooling, uptime and email-deliverability checks (SPF/DKIM/DMARC), security research and domain monitoring.

api.oanor.com/dns-api

Domain and IP registration lookups via RDAP — the modern, structured successor to WHOIS. Get the registrar, registration / update / expiry dates, status codes, nameservers, DNSSEC state, and IP network ownership (CIDR, organization, country).

api.oanor.com/whois-api