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.

5 hosts · 235 ms

HostCertsFirst seenLast seenDNS
quadlockcase.eu 15 2026-05-15 2026-09-24 ok
clk.quadlockcase.eu 2 2026-10-06 2026-10-06 ok
sms.quadlockcase.eu 12 2026-05-10 2026-09-06 ok
account.quadlockcase.eu 15 2026-04-10 2026-10-07 ok
www.quadlockcase.eu 17 2026-05-15 2026-09-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/quadlockcase.eu (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/quadlockcase.eu.