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.

15 hosts · 336 ms

HostCertsFirst seenLast seenDNS
kits.ca 51 2026-05-09 2026-10-02 ok
*.kits.ca 35 2026-05-18 2026-10-02 —
reframe.kits.ca 3 2026-05-29 2026-08-07 ok
www.reframe.kits.ca 3 2026-05-29 2026-08-07 ok
i.kits.ca 3 2026-05-18 2026-09-03 ok
rbe1qxri.kits.ca 65 2026-04-29 2026-08-23 ok
help.kits.ca 26 2026-05-08 2026-09-04 ok
*.camp.kits.ca 5 2026-05-20 2026-09-17 —
fr.kits.ca 10 2026-05-09 2026-09-04 ok
ir.kits.ca 8 2026-04-18 2026-08-14 ok
links.kits.ca 21 2026-05-10 2026-09-06 ok
forms.kits.ca 13 2026-06-02 2026-09-28 ok
fulfillment.kits.ca 12 2026-05-01 2026-08-27 ok
www.kits.ca 10 2026-05-10 2026-09-05 ok
capigateway.kits.ca 14 2026-05-09 2026-09-04 ok

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