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.

10 hosts · 315 ms

HostCertsFirst seenLast seenDNS
aletyx.com 17 2026-05-15 2026-10-01 ok
*.aletyx.com 6 2026-05-16 2026-09-11 —
mba26.aletyx.com 2 2026-10-01 2026-10-01 ok
*.mba26.aletyx.com 2 2026-10-01 2026-10-01 —
kiecve.aletyx.com 8 2026-04-17 2026-08-13 ok
bimi.aletyx.com 6 2026-06-15 2026-08-13 ok
track.aletyx.com 5 2026-05-09 2026-09-07 ok
start.aletyx.com 4 2026-06-03 2026-06-03 ok
www.aletyx.com 10 2026-05-14 2026-09-10 ok
my.aletyx.com 9 2026-05-17 2026-09-13 ok

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