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.

22 hosts · 352 ms

HostCertsFirst seenLast seenDNS
phgr.ch 2 2025-06-06 2026-06-06 ok
mia.phgr.ch 2 2026-03-09 2026-09-23 ok
eduid.phgr.ch 2 2025-07-15 2026-07-16 ok
umfrage.phgr.ch 2 2026-03-10 2026-08-27 ok
moodle.phgr.ch 1 2026-01-07 2026-01-07 ok
jahresberichte.phgr.ch 4 2026-04-11 2026-08-11 ok
pdf.phgr.ch 1 2025-10-06 2025-10-06 ok
bewerbung.phgr.ch 1 2026-09-15 2026-09-15 ok
onlineanmeldung.phgr.ch 3 2025-06-06 2026-06-06 nxdomain
moodlesek.phgr.ch 2 2025-07-01 2026-06-30 ok
algdenken.phgr.ch 1 2026-05-05 2026-05-05 ok
spesen.phgr.ch 1 2025-10-17 2025-10-17 ok
admin.phgr.ch 1 2026-05-01 2026-05-01 ok
intern.phgr.ch 1 2025-06-06 2025-06-06 ok
jobs.phgr.ch 3 2025-08-01 2026-09-15 ok
daylightservices.phgr.ch 1 2025-11-20 2025-11-20 ok
iks.phgr.ch 2 2025-09-11 2026-08-11 ok
ls.phgr.ch 1 2026-09-03 2026-09-03 ok
tutorials.phgr.ch 1 2025-10-06 2025-10-06 ok
moodletest.phgr.ch 1 2026-01-07 2026-01-07 ok
www.phgr.ch 2 2025-06-06 2026-06-06 ok
swisscovery.phgr.ch 3 2026-03-18 2026-09-28 ok

Programmatic access, with DNS A records: API GET /v1/hosts/phgr.ch (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/phgr.ch.