Reference

RDAP support by TLD

Every delegated top-level domain, whether its registry publishes an RDAP service, and the endpoint that serves it. Built from IANA's own bootstrap registry — the same file every RDAP client reads to find a server.

IANA bootstrap published 2026-09-30. This page is rebuilt from data.iana.org/rdap/dns.json and IANA's list of delegated TLDs, so it reflects that file rather than our opinion of it.

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What RDAP is, and why the gaps matter

RDAP — the Registration Data Access Protocol — is the structured replacement for WHOIS. It returns JSON with defined fields, so an expiry date is a date rather than a line of text that every registry formats differently. ICANN requires it of every gTLD registry and registrar, which is why .com, .org, .net and the newer extensions are all covered. Country-code registries set their own policy, which is why nearly every gap below is a ccTLD. The full comparison is here.

Where a registry publishes no RDAP service there is nothing authoritative to query. Some still run legacy WHOIS, but WHOIS has no required response format, so parsing it reliably across registries is not a solved problem — it is a pile of per-registry special cases that breaks whenever a registry changes its output.

The 234 TLDs with no RDAP service

These publish no RDAP endpoint in IANA's bootstrap, so no RDAP client — ours or anyone's — can discover a server for them.

Common questions

How many TLDs support RDAP?

1203 of 1437 delegated TLDs publish an RDAP service — about 84%. The remaining 234 publish no RDAP endpoint in IANA's bootstrap registry, so an RDAP client cannot discover a server for them.

Where does this data come from?

IANA's RDAP bootstrap registry at data.iana.org/rdap/dns.json, cross-referenced with IANA's list of delegated TLDs. This page is rebuilt from both files, and the publication date shown is IANA's own.

What happens if a TLD has no RDAP server?

There is nothing authoritative to query over RDAP. Some of those registries still run a legacy WHOIS service, which is text rather than structured data and has no required format, so results vary by registry and cannot be parsed reliably.

Is RDAP mandatory?

For gTLDs, yes — ICANN requires RDAP of every gTLD registry and registrar. Country-code TLDs set their own policy, which is why most of the gaps below are ccTLDs.

Why do some TLDs appear as xn-- names?

Those are internationalised TLDs in their punycode form, which is how they appear in IANA’s files and in DNS itself. xn--p1ai is .рф, for example.

Related reading

• RDAP vs WHOIS: what changed and why it matters
• Domain status codes: what every EPP code means
• Domain expiry checker
• Who builds DropPerch