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.

12 hosts · 370 ms

HostCertsFirst seenLast seenDNS
airdata.com 42 2026-04-16 2026-10-05 ok
*.airdata.com 40 2026-04-16 2026-10-05 —
media1.airdata.com 5 2026-05-26 2026-09-23 ok
media.airdata.com 5 2026-05-21 2026-09-18 ok
guide.airdata.com 6 2026-04-10 2026-06-08 ok
engage.airdata.com 8 2026-04-14 2026-08-10 ok
newsite.airdata.com 2 2026-09-15 2026-09-15 ok
resources.airdata.com 10 2026-05-09 2026-09-05 ok
airtools.airdata.com 3 2026-07-02 2026-08-31 ok
status.airdata.com 5 2026-05-08 2026-09-04 ok
www.airdata.com 3 2026-09-29 2026-09-29 ok
pay.airdata.com 8 2026-04-16 2026-08-13 ok

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