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 · 455 ms

HostCertsFirst seenLast seenDNS
channing.co.uk 14 2026-05-05 2026-09-01 ok
*.channing.co.uk 8 2026-05-05 2026-09-01 —
schoolbase.channing.co.uk 3 2026-05-03 2026-08-17 ok
fortigate.channing.co.uk 4 2026-04-11 2026-08-09 ok
remote.channing.co.uk 1 2026-05-13 2026-05-13 ok
www.remote.channing.co.uk 1 2026-05-13 2026-05-13 nxdomain
socs-calendar.channing.co.uk 5 2026-05-26 2026-09-14 ok
mta-sts.channing.co.uk 1 2026-05-19 2026-05-19 ok
*.mta-sts.channing.co.uk 1 2026-05-19 2026-05-19 —
bursarysupport.channing.co.uk 1 2026-05-05 2026-05-05 ok
socs-sport.channing.co.uk 5 2026-05-26 2026-09-14 ok
www.channing.co.uk 6 2026-06-17 2026-06-25 ok
community.channing.co.uk 5 2026-06-03 2026-10-02 ok

Programmatic access, with DNS A records: API GET /v1/hosts/channing.co.uk (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/channing.co.uk.