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 · 345 ms

HostCertsFirst seenLast seenDNS
goaheadtours.com 19 2025-07-09 2026-08-29 ok
*.goaheadtours.com 17 2025-06-19 2026-08-29 —
mi.goaheadtours.com 3 2026-06-04 2026-08-25 ok
image.email.goaheadtours.com 2 2025-11-26 2025-11-26 ok
groups.goaheadtours.com 4 2026-04-16 2026-08-18 ok
support.goaheadtours.com 5 2026-04-22 2026-08-20 ok
www.goaheadtours.com 4 2026-04-15 2026-08-17 ok

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