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 · 343 ms

HostCertsFirst seenLast seenDNS
dallasstars.com 17 2026-04-23 2026-09-17 ok
*.dallasstars.com 17 2026-04-23 2026-09-17 —
reportinghub.dallasstars.com 1 2026-06-22 2026-06-22 ok
vcmpricing.reportinghub.dallasstars.com 3 2026-02-20 2026-10-05 ok
api.reportinghub.dallasstars.com 1 2026-06-17 2026-06-17 ok
app.e.dallasstars.com 3 2026-06-17 2026-08-26 ok
images.e.dallasstars.com 5 2026-05-28 2026-08-06 ok
link.dallasstars.com 4 2026-06-07 2026-10-05 ok
go.dallasstars.com 3 2026-06-17 2026-08-26 ok
apollo.dallasstars.com 4 2026-02-20 2026-10-04 ok
api.apollo.dallasstars.com 3 2026-02-19 2026-10-03 ok
api-internal.apollo.dallasstars.com 4 2026-02-19 2026-10-04 ok
pull-request-demo.apollo.dallasstars.com 3 2026-02-20 2026-10-04 ok

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