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.

4 hosts · 306 ms

HostCertsFirst seenLast seenDNS
whatnowmediagroup.com 10 2026-04-17 2026-08-30 ok
*.whatnowmediagroup.com 6 2026-04-17 2026-08-30 —
internal.whatnowmediagroup.com 5 2026-05-03 2026-09-04 ok
www.whatnowmediagroup.com 4 2026-04-20 2026-08-21 ok

Programmatic access, with DNS A records: API GET /v1/hosts/whatnowmediagroup.com (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/whatnowmediagroup.com.