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 · 254 ms

HostCertsFirst seenLast seenDNS
contactsexpress.ca 35 2026-04-09 2026-10-03 ok
*.contactsexpress.ca 17 2026-04-16 2026-09-25 —
i.contactsexpress.ca 3 2026-05-19 2026-09-02 ok
help.contactsexpress.ca 15 2026-04-09 2026-10-03 ok
*.camp.contactsexpress.ca 7 2026-04-09 2026-09-17 —
links.contactsexpress.ca 17 2026-04-09 2026-10-03 ok
ovt.contactsexpress.ca 14 2026-04-09 2026-10-03 ok
www.contactsexpress.ca 19 2026-04-09 2026-10-04 ok
capigateway.contactsexpress.ca 15 2026-04-09 2026-10-04 ok

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