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.

10 hosts · 346 ms

HostCertsFirst seenLast seenDNS
checkinapartments.com 23 2026-04-08 2026-09-09 ok
*.checkinapartments.com 7 2026-04-08 2026-08-22 —
axis.checkinapartments.com 32 2026-06-24 2026-09-02 ok
forms.checkinapartments.com 11 2026-05-21 2026-09-18 ok
careers.checkinapartments.com 10 2026-05-09 2026-09-06 ok
projects.checkinapartments.com 10 2026-05-15 2026-09-12 ok
mta-sts.checkinapartments.com 3 2026-04-17 2026-09-06 ok
account.checkinapartments.com 10 2026-05-31 2026-09-28 ok
support.checkinapartments.com 8 2026-06-05 2026-08-05 ok
www.checkinapartments.com 16 2026-05-13 2026-09-09 ok

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