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 · 288 ms

HostCertsFirst seenLast seenDNS
dgig.ca 6 2025-09-10 2026-10-01 nodata
url5651.dgig.ca 3 2025-09-10 2026-07-14 ok
11197405.dgig.ca 11 2025-11-12 2026-08-27 ok
mail.dgig.ca 5 2025-09-10 2026-10-01 ok
www.dgig.ca 4 2025-09-10 2026-07-06 ok

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