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.

5 hosts · 309 ms

HostCertsFirst seenLast seenDNS
quadlockcase.com.au 18 2026-04-19 2026-10-03 ok
clk.quadlockcase.com.au 2 2026-10-06 2026-10-06 ok
sms.quadlockcase.com.au 8 2026-05-14 2026-09-10 ok
account.quadlockcase.com.au 13 2026-05-22 2026-10-01 ok
www.quadlockcase.com.au 15 2026-05-16 2026-09-25 ok

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