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.

13 hosts · 392 ms

HostCertsFirst seenLast seenDNS
wpforms.com 41 2026-04-09 2026-10-03 ok
*.wpforms.com 41 2026-04-09 2026-10-03 —
secure.el1.wpforms.com 4 2026-07-11 2026-09-08 ok
*.qa.wpforms.com 14 2026-04-09 2026-10-03 —
track.sl.hub.wpforms.com 6 2026-04-19 2026-08-17 ok
a570fe.wpforms.com 5 2026-05-16 2026-09-13 ok
usage.wpforms.com 4 2026-04-12 2026-08-10 ok
airbyte.wpforms.com 5 2026-05-06 2026-09-04 ok
c5713f.wpforms.com 8 2026-04-26 2026-09-05 ok
track.sl.appsmith.wpforms.com 5 2026-07-11 2026-09-09 ok
track.sl.wpforms.com 9 2026-04-19 2026-08-30 ok
geo.wpforms.com 3 2025-06-20 2026-07-15 ok
www.geo.wpforms.com 3 2025-06-20 2026-07-15 nxdomain

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