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.

7 hosts · 240 ms

HostCertsFirst seenLast seenDNS
socialmediaexaminer.com 12 2026-04-27 2026-08-24 ok
*.socialmediaexaminer.com 12 2026-04-27 2026-08-24 —
aa9705.socialmediaexaminer.com 5 2026-05-19 2026-09-16 ok
ca9707.socialmediaexaminer.com 8 2026-05-08 2026-09-17 ok
world.socialmediaexaminer.com 1 2026-09-25 2026-09-25 ok
training.socialmediaexaminer.com 6 2026-05-17 2026-08-08 ok
ai.socialmediaexaminer.com 4 2026-04-15 2026-08-18 ok

Programmatic access, with DNS A records: API GET /v1/hosts/socialmediaexaminer.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/socialmediaexaminer.com.