Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

18 hosts · 212 ms

HostCertsFirst seenLast seen
omo.nl 6 2025-11-25 2026-09-29
*.omo.nl 1 2025-11-25 2025-11-25
service.omo.nl 1 2026-06-30 2026-06-30
facturatie.omo.nl 5 2026-05-25 2026-09-26
moodle.omo.nl 1 2026-09-27 2026-09-27
werkenbij.omo.nl 6 2025-07-15 2026-09-03
servicedesk.omo.nl 3 2025-10-16 2026-09-16
postnl.omo.nl 3 2025-10-20 2026-10-06
eduroam.omo.nl 1 2026-01-05 2026-01-05
halo.omo.nl 3 2025-10-16 2026-09-16
indienstrector.omo.nl 5 2026-05-24 2026-09-19
e.afas.omo.nl 3 2026-06-15 2026-08-30
vacatures.omo.nl 4 2026-06-10 2026-10-06
ons.omo.nl 4 2026-04-20 2026-08-16
dss.omo.nl 2 2026-10-09 2026-10-09
e.accounts.omo.nl 3 2026-06-10 2026-08-25
status.omo.nl 5 2026-05-07 2026-09-09
www.omo.nl 5 2026-04-15 2026-09-29

Programmatic access: API GET /v1/hosts/omo.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/omo.nl.