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.

17 hosts · 343 ms

HostCertsFirst seenLast seenDNS
rideandy.com 32 2026-04-19 2026-09-22 ok
*.rideandy.com 16 2026-04-22 2026-08-18 —
auth.rideandy.com 10 2026-05-29 2026-09-25 ok
clerk.rideandy.com 9 2026-06-06 2026-10-03 ok
cdn.rideandy.com 10 2026-05-13 2026-09-08 ok
admin.rideandy.com 10 2026-05-27 2026-09-22 ok
*.admin.rideandy.com 10 2026-05-27 2026-09-22 —
clerk.admin.rideandy.com 8 2026-04-10 2026-06-08 ok
go.rideandy.com 4 2026-04-10 2026-08-12 ok
help.rideandy.com 5 2026-05-14 2026-09-21 ok
app.rideandy.com 1 2026-04-16 2026-04-16 ok
clerk.driver.rideandy.com 8 2026-04-10 2026-06-08 ok
assets.rideandy.com 10 2026-04-11 2026-08-08 ok
accounts.rideandy.com 8 2026-06-06 2026-10-02 ok
clerk.client.rideandy.com 5 2026-04-10 2026-06-08 ok
sst.rideandy.com 3 2026-06-12 2026-08-11 ok
dev.rideandy.com 3 2026-06-05 2026-08-06 ok

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