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.

4 hosts · 253 ms

HostCertsFirst seenLast seenDNS
the-littlemarvin.com 17 2026-04-11 2026-09-21 ok
journal.the-littlemarvin.com 16 2026-05-25 2026-10-03 ok
account.the-littlemarvin.com 13 2026-05-19 2026-09-30 ok
www.the-littlemarvin.com 12 2026-05-25 2026-10-04 ok

Programmatic access, with DNS A records: API GET /v1/hosts/the-littlemarvin.com (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/the-littlemarvin.com.