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.

19 hosts · 272 ms

HostCertsFirst seenLast seenDNS
joybird.com 51 2025-08-21 2026-10-01 ok
*.joybird.com 53 2025-08-21 2026-10-01 —
hummingbird.joybird.com 5 2026-05-30 2026-09-25 ok
*.store.joybird.com 3 2025-08-21 2026-09-10 —
*.4oh.joybird.com 2 2025-09-05 2026-08-05 —
design.joybird.com 4 2026-04-21 2026-08-15 ok
help.joybird.com 3 2026-03-20 2026-08-20 ok
modular.joybird.com 5 2026-04-21 2026-08-17 ok
tumblr.joybird.com 10 2026-04-30 2026-09-27 ok
preferences.joybird.com 8 2026-05-07 2026-09-02 ok
quizzes.joybird.com 7 2026-05-15 2026-09-06 ok
www.quizzes.joybird.com 7 2026-05-15 2026-09-06 ok
*.prod.nest.joybird.com 4 2025-06-15 2026-08-15 —
gtm.prod.nest.joybird.com 4 2026-05-28 2026-09-13 ok
*.feature.nest.joybird.com 1 2025-11-15 2025-11-15 —
*.stg.nest.joybird.com 2 2026-03-08 2026-07-24 —
*.test.nest.joybird.com 1 2025-11-05 2025-11-05 —
*.dev.nest.joybird.com 4 2025-08-07 2026-08-04 —
mcage.dev.nest.joybird.com 5 2026-05-05 2026-09-02 ok

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