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.

12 hosts · 321 ms

HostCertsFirst seenLast seenDNS
tomrockets.com 11 2025-12-10 2026-10-03 ok
*.tomrockets.com 10 2026-04-09 2026-10-03 —
m1.tomrockets.com 4 2026-04-09 2026-08-07 ok
staging.tomrockets.com 6 2026-06-05 2026-10-01 ok
gay-blog.tomrockets.com 5 2026-04-26 2026-09-03 ok
track.tomrockets.com 4 2026-06-07 2026-10-05 ok
r.newsletter.tomrockets.com 3 2026-06-21 2026-09-09 ok
crewos.tomrockets.com 1 2026-09-14 2026-09-14 ok
chat.tomrockets.com 1 2026-09-25 2026-09-25 ok
gay-blog-alt.tomrockets.com 5 2026-04-09 2026-10-04 ok
bot.tomrockets.com 2 2026-04-23 2026-04-23 ok
www.tomrockets.com 1 2025-12-10 2025-12-10 ok

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