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.

28 hosts · 191 ms

HostCertsFirst seenLast seen
lelystad.nl 5 2025-12-22 2026-08-15
*.lelystad.nl 1 2025-12-22 2025-12-22
sibp01.lelystad.nl 1 2025-10-16 2025-10-16
sibt01.lelystad.nl 1 2025-10-16 2025-10-16
test-ipa.lelystad.nl 1 2026-06-15 2026-06-15
idp.test-ipa.lelystad.nl 1 2026-07-13 2026-07-13
subsidies-backend.lelystad.nl 5 2026-05-10 2026-09-07
belastingbalie.lelystad.nl 6 2025-06-27 2026-09-11
iparticipatie.lelystad.nl 1 2026-06-15 2026-06-15
subsidies-backend.acceptatie.lelystad.nl 5 2026-05-07 2026-09-04
subsidies.acceptatie.lelystad.nl 5 2026-05-07 2026-09-04
werkplek.lelystad.nl 11 2026-06-08 2026-10-04
ibzpink.lelystad.nl 2 2025-06-27 2026-07-06
crm.lelystad.nl 3 2026-06-23 2026-08-22
iburgerzaken.lelystad.nl 2 2025-07-09 2026-07-10
openformulieren.lelystad.nl 2 2026-06-04 2026-06-04
idp.lelystad.nl 1 2026-07-01 2026-07-01
desktop.lelystad.nl 5 2026-05-30 2026-09-27
openinwoner.lelystad.nl 4 2026-04-22 2026-06-21
werkenvoor.lelystad.nl 4 2026-04-14 2026-09-13
subsidies.lelystad.nl 5 2026-05-10 2026-09-07
apps.lelystad.nl 2 2026-03-06 2026-09-07
radius.lelystad.nl 2 2025-07-10 2026-07-13
project.lelystad.nl 1 2026-07-13 2026-07-13
eloket.lelystad.nl 1 2026-02-05 2026-02-05
testeloket.lelystad.nl 1 2026-02-05 2026-02-05
openformulieren-test.lelystad.nl 2 2026-06-04 2026-06-04
openinwoner-test.lelystad.nl 3 2026-04-13 2026-06-13

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