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.

20 hosts · 344 ms

HostCertsFirst seenLast seenDNS
abcfws.com 18 2026-04-29 2026-09-26 ok
*.abcfws.com 7 2026-04-29 2026-09-16 —
password.abcfws.com 2 2025-12-30 2025-12-30 ok
www.password.abcfws.com 2 2025-12-30 2025-12-30 nxdomain
accounting.abcfws.com 13 2025-07-30 2026-07-22 ok
cxsiamlog.abcfws.com 2 2026-01-09 2026-01-12 ok
www.cxsiamlog.abcfws.com 2 2026-01-09 2026-01-12 nxdomain
org.abcfws.com 15 2025-06-08 2026-07-22 ok
abcservicedesk.abcfws.com 15 2025-06-08 2026-07-22 ok
trk.email.abcfws.com 10 2026-04-19 2026-08-15 ok
esm.abcfws.com 15 2025-06-08 2026-07-22 ok
www.esm.abcfws.com 15 2025-06-08 2026-07-22 nxdomain
vendor.abcfws.com 3 2026-02-18 2026-10-02 ok
aiagent.abcfws.com 2 2025-12-30 2025-12-30 nxdomain
www.aiagent.abcfws.com 2 2025-12-30 2025-12-30 nxdomain
support.abcfws.com 3 2025-07-09 2026-07-19 ok
www.support.abcfws.com 3 2025-07-09 2026-07-19 nxdomain
datagov.abcfws.com 10 2026-01-20 2026-07-22 ok
www.abcfws.com 9 2026-05-28 2026-09-23 ok
delivery.abcfws.com 1 2025-10-22 2025-10-22 ok

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