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.

7 hosts · 262 ms

HostCertsFirst seenLast seenDNS
westercom.eu 9 2026-03-21 2026-09-28 ok
*.westercom.eu 8 2026-03-21 2026-09-28 —
obchod.westercom.eu 2 2026-08-11 2026-08-11 ok
bimi.westercom.eu 4 2026-04-08 2026-08-07 ok
services.westercom.eu 5 2026-05-04 2026-09-02 ok
nis2.services.westercom.eu 1 2026-09-01 2026-09-01 ok
www.westercom.eu 1 2026-08-30 2026-08-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/westercom.eu (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/westercom.eu.