Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

6 hosts · 270 ms

HostCertsFirst seenLast seenDNS
loopsy.store 14 2026-04-11 2026-09-24 ok
account.loopsy.store 17 2026-05-10 2026-09-21 ok
rsst.loopsy.store 4 2026-05-08 2026-07-07 ok
www.loopsy.store 15 2026-04-10 2026-09-24 ok
ctx.loopsy.store 4 2026-08-12 2026-08-12 ok
load.ctx.loopsy.store 2 2026-08-12 2026-08-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/loopsy.store (API key for paging).

Shown here: hostnames with a certificate that is valid now or expired within the last 90 days. The full history since 2013 — hostnames whose last certificate expired earlier — is a Pro plan method: GET /v1/hosts-history/loopsy.store.