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.

21 hosts · 363 ms

HostCertsFirst seenLast seenDNS
housing.com 12 2025-07-21 2026-08-26 ok
*.housing.com 24 2025-07-17 2026-09-01 —
l2c-gamma.housing.com 1 2026-06-11 2026-06-11 ok
*.staging.housing.com 3 2026-04-09 2026-07-17 —
ithousing.housing.com 2 2026-08-31 2026-08-31 ok
*.adtech.housing.com 4 2025-11-12 2026-08-17 —
capi.housing.com 5 2026-05-14 2026-09-11 ok
ithelpdesk.housing.com 4 2026-08-31 2026-08-31 nxdomain
itdesk.housing.com 2 2026-08-31 2026-08-31 ok
elink.mail.housing.com 51 2026-04-23 2026-08-21 ok
link.email.housing.com 5 2026-04-22 2026-09-07 ok
origin-mum.housing.com 12 2026-06-04 2026-09-30 ok
lookup.housing.com 2 2026-06-06 2026-06-11 ok
www.lookup.housing.com 2 2026-06-06 2026-06-11 nodata
nctrk.mails.housing.com 27 2026-04-22 2026-09-01 ok
delivery.mails.housing.com 1 2026-08-12 2026-08-12 ok
careers.housing.com 16 2026-05-09 2026-09-04 ok
support.housing.com 8 2026-05-21 2026-09-16 ok
dev.housing.com 3 2026-04-15 2026-07-14 nodata
*.dev.housing.com 1 2026-04-15 2026-04-15 —
delivery.housing.com 2 2026-06-08 2026-09-04 ok

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