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.

9 hosts · 340 ms

HostCertsFirst seenLast seenDNS
4strongpaws.com 12 2026-04-15 2026-09-21 ok
*.4strongpaws.com 7 2026-05-25 2026-09-21 —
email.lc.4strongpaws.com 3 2026-07-14 2026-09-12 ok
preprod.4strongpaws.com 1 2026-04-11 2026-04-11 ok
staging.4strongpaws.com 6 2026-04-14 2026-09-18 ok
cpanel.4strongpaws.com 5 2026-04-15 2026-08-15 ok
mail.4strongpaws.com 5 2026-04-15 2026-08-15 ok
register.4strongpaws.com 2 2026-08-25 2026-08-25 ok
www.4strongpaws.com 5 2026-04-15 2026-08-15 ok

Programmatic access, with DNS A records: API GET /v1/hosts/4strongpaws.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/4strongpaws.com.