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.

11 hosts · 279 ms

HostCertsFirst seenLast seenDNS
emails.ancestry.com 19 2026-04-14 2026-10-01 ok
*.emails.ancestry.com 8 2026-06-04 2026-10-01 —
mhnmbir1.emails.ancestry.com 8 2026-04-14 2026-08-22 ok
xghrbzn2.emails.ancestry.com 8 2026-04-14 2026-08-22 ok
io7qthn6.emails.ancestry.com 8 2026-04-14 2026-08-22 ok
izqdmi6k.emails.ancestry.com 8 2026-04-14 2026-08-23 ok
e0lrwkkp.emails.ancestry.com 8 2026-04-14 2026-08-22 ok
qcencodq.emails.ancestry.com 11 2026-04-14 2026-08-22 ok
fzf6qelt.emails.ancestry.com 8 2026-04-14 2026-08-23 ok
ziwrbqox.emails.ancestry.com 10 2026-04-14 2026-08-22 ok
nmunluky.emails.ancestry.com 8 2026-04-14 2026-08-23 ok

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