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.

15 hosts · 273 ms

HostCertsFirst seenLast seenDNS
baseus.com 13 2026-05-07 2026-10-01 ok
*.baseus.com 1 2026-05-07 2026-05-07 —
sk.baseus.com 15 2026-04-16 2026-08-24 ok
uk.baseus.com 15 2026-04-24 2026-09-02 ok
pl.baseus.com 15 2026-05-25 2026-10-04 ok
go.baseus.com 5 2026-05-28 2026-09-23 ok
es.baseus.com 5 2026-05-11 2026-09-03 ok
www.es.baseus.com 5 2026-05-11 2026-09-03 ok
email.logistics-us.baseus.com 5 2026-05-13 2026-09-10 ok
img.mkt.baseus.com 6 2026-05-06 2026-09-01 ok
r.mkt.baseus.com 3 2026-06-17 2026-09-04 ok
eu.baseus.com 18 2026-05-23 2026-10-03 ok
www.baseus.com 15 2026-04-12 2026-09-24 ok
security.baseus.com 13 2026-04-21 2026-08-31 ok
cz.baseus.com 13 2026-05-15 2026-09-23 ok

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