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 · 300 ms

HostCertsFirst seenLast seenDNS
m-vanguard.com 1 2026-07-30 2026-07-30 nodata
click.m-vanguard.com 16 2026-05-21 2026-09-16 ok
email.m-vanguard.com 16 2026-05-17 2026-09-12 ok
info.m-vanguard.com 14 2026-05-18 2026-08-28 ok
pages.m-vanguard.com 19 2026-05-16 2026-08-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/m-vanguard.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/m-vanguard.com.