Find every subdomain
of a domain.

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

12 hosts · 294 ms

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HostCertsFirst seenLast seen
xerof.com 25 2026-05-01 2026-10-09
*.xerof.com 7 2026-05-30 2026-09-25
c1.xerof.com 2 2026-10-09 2026-10-09
*.c1.xerof.com 2 2026-10-09 2026-10-09
t1.xerof.com 2 2026-10-08 2026-10-08
*.t1.xerof.com 2 2026-10-08 2026-10-08
onboard.xerof.com 3 2026-09-18 2026-09-18
proof.xerof.com 2 2026-10-08 2026-10-08
*.proof.xerof.com 2 2026-10-08 2026-10-08
tr.xerof.com 2 2026-10-08 2026-10-08
*.tr.xerof.com 2 2026-10-08 2026-10-08
www.xerof.com 4 2026-05-07 2026-09-17

Programmatic access: API GET /v1/hosts/xerof.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/xerof.com.