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.

8 hosts · 259 ms

HostCertsFirst seenLast seen
main-method.com 10 2026-05-24 2026-09-22
gitlab.main-method.com 5 2026-05-18 2026-09-15
web.main-method.com 3 2026-06-15 2026-08-14
did.main-method.com 5 2026-05-22 2026-09-19
traefik.main-method.com 5 2026-05-21 2026-09-18
mta-sts.main-method.com 3 2026-05-23 2026-10-13
www.main-method.com 5 2026-05-24 2026-09-21
registry.main-method.com 5 2026-05-17 2026-09-14

Programmatic access: API GET /v1/hosts/main-method.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/main-method.com.