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 · 357 ms

HostCertsFirst seenLast seenDNS
vagal.com 21 2026-04-19 2026-09-29 ok
*.vagal.com 17 2026-05-19 2026-09-29 —
jbkgtjhm.vagal.com 6 2026-05-16 2026-09-11 ok
metrics.vagal.com 6 2026-04-25 2026-08-21 ok
www.vagal.com 4 2026-04-19 2026-08-19 ok

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