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.

24 hosts · 206 ms

HostCertsFirst seenLast seen
feyenoord.nl 17 2026-05-10 2026-09-06
*.feyenoord.nl 17 2026-05-10 2026-09-06
historie.feyenoord.nl 4 2026-06-03 2026-06-03
webversie.feyenoord.nl 7 2026-05-26 2026-09-21
one.feyenoord.nl 2 2026-04-04 2026-09-04
*.one.feyenoord.nl 2 2026-04-04 2026-09-04
reiskostenvergoeding.feyenoord.nl 2 2026-03-01 2026-06-24
login.staging.feyenoord.nl 2 2026-02-28 2026-07-10
cdn.fanshop.staging.feyenoord.nl 2 2026-03-01 2026-07-17
zakelijkekaarten.tickets.staging.feyenoord.nl 2 2026-03-11 2026-06-29
beeldbank.feyenoord.nl 2 2026-06-04 2026-06-04
voorspel.feyenoord.nl 2 2026-05-10 2026-05-10
sso-email.feyenoord.nl 5 2026-05-23 2026-09-21
dam.feyenoord.nl 2 2026-03-17 2026-08-17
vragen.feyenoord.nl 2 2026-05-10 2026-05-10
login.feyenoord.nl 2 2026-03-01 2026-07-10
go.feyenoord.nl 3 2026-06-14 2026-08-21
fanshop.feyenoord.nl 15 2026-04-13 2026-09-27
acties.feyenoord.nl 2 2026-05-11 2026-05-11
vacatures.feyenoord.nl 2 2026-06-03 2026-06-03
soccerschools.feyenoord.nl 5 2026-05-07 2026-09-05
tickets.feyenoord.nl 1 2026-02-25 2026-02-25
businesstickets.feyenoord.nl 1 2026-03-11 2026-03-11
cdn.fanshop.test.feyenoord.nl 2 2026-03-01 2026-07-17

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