.su

Country-code top-level domain for the former Soviet Union

WHOIS

Register: —first year
Renew: —a year
Transfer: —to move it
Registrars: —quoting it
Lookup: WHOISanswers for it
DNSSEC: Signed1 DS record in the root
Level: Secondmybrand.su

Check a name

One command, straight against the registry — no account, no page to load.

Name

Fills the command and the registrar links below in with your own name. The page is static — nothing is looked up here, and nothing you type leaves the browser.

ds mybrand --tld su

Add --where for the registrars and the registry's rules, --registry for the server that answered, or --all-info for everything at once.

What it costs

No registrar in the price table bundled with ds quotes .su, so the CLI prints no figure beside it — one of 927 such TLDs. That is a gap in the table as often as it is a TLD nobody sells. See Prices for supplying your own table with --pricing-file.

Who can register

No eligibility rule is on file for .su, which is not the same as a promise that it is open: the list is hand-maintained and covers the restricted TLDs a registrar is likely to offer you. Check the registry's own page before counting on a name. 81 TLDs do carry a rule — see Who can register.

How `ds` answers for it

RDAP first, WHOIS second — the same order for every TLD. .su has no RDAP service, so the answer comes from WHOIS text on port 43.

WHOIS: whois.ripn.netQueried on port 43, from the bundled whois.json. The name is called free when the reply contains No entries found — text matching, which is why RDAP is preferred where it exists.

ds mybrand --tld su --registry prints whichever of these answered. If a bundled WHOIS host has gone stale, IANA is asked who serves .su today. See Accuracy notes.

The registry

From IANA's delegation record for .su. .su is a country-code TLD.

Run by: Russian Institute for Development of Public Networks (ROSNIIROS)Based in Russian Federation. Delegated 1990-09-19, record last updated 2026-08-05.
Published services: whois.tcinet.ruWhat the registry itself tells IANA it runs. Note: the bundled table asks whois.ripn.net instead — one of them is out of date, and ds falls back to asking IANA when a bundled host goes stale.
Name servers: a.dns.ripn.netb.dns.ripn.netc.tld-servers.rud.dns.ripn.nete.dns.ripn.netf.dns.ripn.netThe 6 authoritative servers for the .su zone — what the root delegates to. Nothing ds queries directly; they are what makes a registered name resolve.

What it is

Derived from the root zone and ICANN's registry list — each one is a fact with a source.

country-code IANA Root Zone Database types it "country-code"

In the root zone

The delegation itself, read out of the root zone — serial 2026090900, on 2026-09-09. The registry section above is IANA's record of what .su was delegated to; this is what the root actually answers with when a resolver asks it where .su lives.

Delegated to: a.dns.ripn.net193.232.128.62001:678:17:0:193:232:128:6
b.dns.ripn.net194.85.252.622001:678:16:0:194:85:252:62
c.tld-servers.ru194.190.122.172a09:bd00:1:0:194:190:122:17
d.dns.ripn.net194.190.124.172001:678:18:0:194:190:124:17
e.dns.ripn.net193.232.142.172001:678:15:0:193:232:142:17
f.dns.ripn.net193.232.156.172001:678:14:0:193:232:156:17
The 6 name servers the root hands out for .su, with the glue addresses that come with them — every one of them answers over IPv6. None of this is what ds queries: these servers know which names exist, not who registered them.
DNSSEC: Signed — 1 DS record in the root
key 42982RSA/SHA-256 · SHA-2567B533AF433CC945BF785F3C500A279B052DFD76658E484C70CCE40C2A9FBC251
Each one is a fingerprint of .su's own signing key, published by the root and signed with the root's key — which is how a resolver that trusts only one key can prove an answer under .su came from its registry and was not tampered with in transit. It says nothing about who owns a name or whether one is free.

Ask the root yourself — no registry involved, and the same records this section was built from: dig +norec @a.root-servers.net su. NS and dig +norec @a.root-servers.net su. DS.