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.

8 hosts · 295 ms

HostCertsFirst seenLast seenDNS
efarma.nl 7 2026-05-03 2026-08-31 ok
url001.efarma.nl 4 2026-04-15 2026-08-13 ok
unsubscribe.efarma.nl 4 2026-04-11 2026-08-09 ok
app.api.efarma.nl 1 2026-05-18 2026-05-18 ok
www.app.api.efarma.nl 1 2026-05-18 2026-05-18 ok
memphis.api.efarma.nl 1 2026-05-18 2026-05-18 nxdomain
memphisserver.apo.efarma.nl 1 2026-05-18 2026-05-18 nxdomain
www.efarma.nl 7 2026-05-03 2026-08-31 ok

Programmatic access, with DNS A records: API GET /v1/hosts/efarma.nl (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/efarma.nl.