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.

18 hosts · 312 ms

HostCertsFirst seenLast seenDNS
wayground.com 9 2026-04-06 2026-09-20 ok
*.wayground.com 9 2026-04-06 2026-09-20 —
people.wayground.com 8 2026-04-14 2026-08-10 ok
capture.wayground.com 2 2026-09-01 2026-09-01 —
*.teach.wayground.com 2 2026-04-09 2026-09-09 —
*.hi.wayground.com 2 2026-04-20 2026-09-20 —
*.internal.wayground.com 1 2026-07-21 2026-07-21 —
*.team.wayground.com 2 2026-04-20 2026-09-20 —
urm.wayground.com 6 2026-05-04 2026-08-30 ok
*.learn.wayground.com 2 2026-04-20 2026-09-20 —
*.info.wayground.com 2 2026-04-20 2026-09-20 —
*.hello.wayground.com 2 2026-04-09 2026-09-09 —
help.wayground.com 8 2026-04-26 2026-08-22 ok
forbusiness-help.wayground.com 10 2026-04-26 2026-08-23 ok
updates.wayground.com 8 2026-05-05 2026-08-31 ok
mta-sts.wayground.com 5 2026-05-03 2026-09-01 ok
*.connect.wayground.com 2 2026-04-09 2026-09-09 —
www.test.wayground.com 1 2025-12-05 2025-12-05 ok

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