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.

9 hosts · 343 ms

HostCertsFirst seenLast seenDNS
psychobunny.ca 18 2026-04-13 2026-09-05 ok
*.psychobunny.ca 12 2026-04-19 2026-09-05 —
help.psychobunny.ca 10 2026-04-16 2026-08-12 ok
comp.psychobunny.ca 1 2025-06-26 2025-06-26 nxdomain
refer.psychobunny.ca 1 2026-02-02 2026-02-02 ok
qr.psychobunny.ca 5 2026-04-25 2026-08-22 ok
sms.psychobunny.ca 10 2026-04-12 2026-08-09 ok
account.psychobunny.ca 15 2026-05-23 2026-10-03 ok
www.psychobunny.ca 4 2026-04-12 2026-08-10 ok

Programmatic access, with DNS A records: API GET /v1/hosts/psychobunny.ca (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/psychobunny.ca.