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 · 297 ms

HostCertsFirst seenLast seenDNS
apcollege.edu.au 32 2026-04-15 2026-09-20 ok
*.apcollege.edu.au 14 2026-04-15 2026-09-19 —
www2.apcollege.edu.au 20 2026-05-25 2026-09-20 ok
kb.apcollege.edu.au 5 2026-05-07 2026-09-03 ok
lln-retired.apcollege.edu.au 4 2026-05-29 2026-06-05 ok
link.apcollege.edu.au 4 2026-04-12 2026-08-10 ok
learn.apcollege.edu.au 3 2026-05-31 2026-08-09 ok
books.apcollege.edu.au 11 2026-06-02 2026-09-28 ok
mta-sts.apcollege.edu.au 1 2026-10-07 2026-10-07 ok
support.apcollege.edu.au 40 2026-04-20 2026-08-26 ok
lln-test.apcollege.edu.au 2 2026-06-02 2026-06-02 nodata
www.lln-test.apcollege.edu.au 2 2026-06-02 2026-06-02 nxdomain
www.apcollege.edu.au 12 2026-05-26 2026-09-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/apcollege.edu.au (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/apcollege.edu.au.