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.

35 hosts · 238 ms

HostCertsFirst seenLast seen
nrc.nl 21 2026-03-03 2026-10-07
*.nrc.nl 21 2026-03-03 2026-10-07
lb-aws-eu-west-1.nrc.nl 3 2026-04-14 2026-09-14
content1.nrc.nl 7 2026-05-03 2026-09-30
www.weblogs2.nrc.nl 6 2026-05-04 2026-09-01
content2.nrc.nl 2 2025-11-19 2026-08-31
r2test2.nrc.nl 11 2026-05-31 2026-09-27
www.weblogs3.nrc.nl 6 2026-05-04 2026-09-01
content3.nrc.nl 6 2026-06-04 2026-10-02
ec114.nrc.nl 9 2026-06-10 2026-09-20
content4.nrc.nl 5 2026-05-01 2026-09-18
rsdb.nrc.nl 1 2026-01-22 2026-01-22
r2hub.nrc.nl 9 2026-06-09 2026-10-05
carriere.nrc.nl 9 2026-05-05 2026-09-12
*.ab-test.gorse.nrc.nl 1 2026-04-14 2026-04-14
special.nrc.nl 5 2026-04-23 2026-08-21
advertorial.nrc.nl 5 2026-04-29 2026-08-27
mail.nrc.nl 12 2026-06-04 2026-10-01
www.m.nrc.nl 6 2026-05-04 2026-09-01
adverteren.nrc.nl 5 2026-05-11 2026-09-08
abonnementen.nrc.nl 1 2025-09-08 2025-09-08
acc-abonnementen.nrc.nl 1 2025-09-15 2025-09-15
www.acc-abonnementen.nrc.nl 1 2025-09-15 2025-09-15
www.abonnementen.nrc.nl 1 2025-09-08 2025-09-08
recommender.nrc.nl 1 2026-05-21 2026-05-21
specials.nrc.nl 5 2026-04-23 2026-08-21
advertorials.nrc.nl 5 2026-04-24 2026-08-22
bannercms.nrc.nl 5 2026-04-23 2026-08-21
aixperiment.nrc.nl 1 2026-09-24 2026-09-24
woot.nrc.nl 3 2026-04-14 2026-09-14
acc-woot.nrc.nl 3 2026-04-14 2026-09-14
r2test.nrc.nl 13 2026-06-02 2026-09-29
sst.nrc.nl 4 2026-06-02 2026-08-01
load.sst.nrc.nl 7 2026-05-16 2026-07-14
gorse-shadow.nrc.nl 1 2026-04-14 2026-04-14

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