Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

17 hosts · 179 ms

HostCertsFirst seenLast seen
cheapflights.com 20 2026-05-01 2026-09-13
*.cheapflights.com 14 2026-05-18 2026-09-13
ae.cheapflights.com 5 2026-05-01 2026-08-29
www.ae.cheapflights.com 5 2026-05-01 2026-08-29
th.cheapflights.com 5 2026-05-31 2026-09-28
www.th.cheapflights.com 5 2026-05-31 2026-09-28
api.cheapflights.com 5 2026-04-27 2026-08-25
link.cheapflights.com 8 2026-05-06 2026-09-19
global.cheapflights.com 4 2026-06-07 2026-10-05
in.cheapflights.com 5 2026-05-01 2026-08-29
www.in.cheapflights.com 5 2026-05-01 2026-08-29
vn.cheapflights.com 4 2026-04-15 2026-08-13
www.vn.cheapflights.com 5 2026-05-01 2026-08-29
es.cheapflights.com 5 2026-05-01 2026-08-29
www.es.cheapflights.com 5 2026-05-01 2026-08-29
appimages.cheapflights.com 5 2026-05-01 2026-08-29
www.cheapflights.com 5 2026-05-01 2026-08-29

Programmatic access: API GET /v1/hosts/cheapflights.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/cheapflights.com.