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.

13 hosts · 263 ms

HostCertsFirst seenLast seenDNS
m10.samsunggalaxy.email 1 2026-05-07 2026-05-07 nxdomain
res10.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
t10.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
m13.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
res13.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
t13.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
m14.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
res14.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
t14.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
rt1-m.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
rt2-m.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
rt1-t.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok
rt2-t.samsunggalaxy.email 1 2026-05-07 2026-05-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/samsunggalaxy.email (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/samsunggalaxy.email.