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.

100 hosts (first page) · 272 ms

HostCertsFirst seenLast seen
aok.de 3 2026-02-20 2026-06-23
*.aok.de 1 2026-02-20 2026-02-20
x500.aok.de 3 2026-02-25 2026-08-20
sn0.aok.de 1 2026-04-21 2026-04-21
by0.aok.de 1 2026-04-21 2026-04-21
staging-fk-1.aok.de 3 2026-02-27 2026-08-19
search01.aok.de 2 2025-10-21 2026-09-25
ldapzsa1.aok.de 1 2026-02-18 2026-02-18
ixkonfrec1.aok.de 1 2025-09-19 2025-09-19
webmail1.aok.de 2 2026-01-27 2026-02-10
sn1.aok.de 1 2026-05-04 2026-05-04
kibana-twim7xq9k7.live.colt1.aok.de 2 2025-08-19 2026-07-15
mailcatcher-ogt7pyejoc.live.colt1.aok.de 2 2025-08-19 2026-07-15
mx1.aok.de 1 2026-01-22 2026-01-22
by1.aok.de 1 2026-05-04 2026-05-04
staging-fk-2.aok.de 3 2026-02-27 2026-08-19
search02.aok.de 2 2025-10-21 2026-09-25
ldapzsa2.aok.de 1 2026-02-18 2026-02-18
ixkonfrec2.aok.de 1 2025-09-19 2025-09-19
webmail2.aok.de 2 2026-01-27 2026-02-10
mx2.aok.de 1 2026-01-22 2026-01-22
staging-fk-3.aok.de 3 2026-02-27 2026-08-19
search03.aok.de 2 2025-10-21 2026-09-25
ldapzsa3.aok.de 1 2026-02-18 2026-02-18
webmail3.aok.de 2 2026-01-27 2026-02-10
styleguide-multilanguage.dev.colt3.aok.de 4 2026-05-13 2026-07-13
mx3.aok.de 1 2026-01-15 2026-01-15
staging-fk-4.aok.de 3 2026-02-27 2026-08-19
approve.zsa4.aok.de 1 2026-10-08 2026-10-08
*.approve.zsa4.aok.de 1 2026-10-08 2026-10-08
int.zsa4.aok.de 1 2026-10-08 2026-10-08
*.int.zsa4.aok.de 1 2026-10-08 2026-10-08
dev.zsa4.aok.de 1 2026-10-08 2026-10-08
*.dev.zsa4.aok.de 1 2026-10-08 2026-10-08
ldapzsa4.aok.de 1 2026-02-18 2026-02-18
webmail4.aok.de 2 2026-01-27 2026-02-10
mx4.aok.de 1 2026-01-15 2026-01-15
julia35.aok.de 1 2026-02-19 2026-02-19
webmail5.aok.de 2 2026-01-27 2026-02-10
webmail6.aok.de 2 2026-01-27 2026-02-10
ixwebrtcmedia.aok.de 1 2025-09-19 2025-09-19
julia.aok.de 1 2026-02-19 2026-02-19
klara.aok.de 4 2026-05-12 2026-06-22
vpn-zsa.aok.de 2 2026-01-16 2026-01-19
ldap-avaya.zsa.aok.de 1 2026-02-18 2026-02-18
ldap-bv-avaya.zsa.aok.de 1 2026-02-18 2026-02-18
ldap4avaya.zsa.aok.de 1 2026-02-18 2026-02-18
ldap4nf.zsa.aok.de 1 2026-02-18 2026-02-18
ldap4navi.zsa.aok.de 1 2026-02-18 2026-02-18
ldapbak.zsa.aok.de 1 2026-02-18 2026-02-18
infoportal.zsa.aok.de 2 2026-02-18 2026-02-20
ldapzsa.aok.de 1 2026-02-18 2026-02-18
sbc-hb.aok.de 2 2026-02-23 2026-03-11
webkonferenz.uc.hb.aok.de 1 2025-09-19 2025-09-19
hybrid.hb.aok.de 1 2026-05-21 2026-05-21
kampagne.hb.aok.de 5 2025-08-22 2026-08-20
cxsf.hb.aok.de 2 2026-03-18 2026-09-09
hb0.capgemini.hb.aok.de 3 2025-08-04 2026-07-22
hb1.capgemini.hb.aok.de 3 2025-08-04 2026-07-22
api.hb.aok.de 3 2025-08-27 2026-08-20
mail.hb.aok.de 1 2026-05-21 2026-05-21
information.hb.aok.de 1 2026-09-14 2026-09-14
vpn.hb.aok.de 2 2026-04-07 2026-04-08
zsavpn.hb.aok.de 1 2026-01-22 2026-01-22
intro.hb.aok.de 2 2025-12-18 2026-01-15
vf-sip.hb.aok.de 1 2025-08-20 2025-08-20
autodiscover.hb.aok.de 1 2026-05-21 2026-05-21
sts.hb.aok.de 1 2025-11-17 2025-11-17
connect.hb.aok.de 1 2026-01-14 2026-01-14
kampagne-test.hb.aok.de 5 2025-08-22 2026-08-20
api-test.hb.aok.de 3 2025-08-27 2026-08-20
information-test.hb.aok.de 1 2026-09-14 2026-09-14
hybrid.ad-itu.hb.aok.de 1 2026-05-21 2026-05-21
mail.ad-itu.hb.aok.de 1 2026-05-21 2026-05-21
autodiscover.ad-itu.hb.aok.de 1 2026-05-21 2026-05-21
mx.ad-itu.hb.aok.de 1 2026-05-21 2026-05-21
mx.hb.aok.de 1 2026-05-21 2026-05-21
aok-fk-prod.aok.de 3 2026-02-27 2026-08-19
zd.aok.de 1 2026-02-02 2026-02-02
*.zd.aok.de 1 2026-02-02 2026-02-02
colt1.zd.aok.de 1 2026-01-30 2026-01-30
mailcatcher-ome.colt1.zd.aok.de 5 2026-05-02 2026-08-30
avaya.live.colt1.zd.aok.de 5 2026-05-02 2026-08-30
legzdnutze.live.colt1.zd.aok.de 6 2026-05-02 2026-08-30
legzdlbs.live.colt1.zd.aok.de 6 2026-05-02 2026-08-30
legzdforms.live.colt1.zd.aok.de 6 2026-05-02 2026-08-30
legzdevent.live.colt1.zd.aok.de 6 2026-05-02 2026-08-30
pweqappov-dybk2smeju.live.colt1.zd.aok.de 5 2026-05-05 2026-09-02
mailcatcher.colt1.zd.aok.de 5 2026-05-02 2026-08-30
vpb.test.colt1.zd.aok.de 5 2026-05-05 2026-09-02
vpb.dev.colt1.zd.aok.de 5 2026-05-02 2026-08-30
staging-formulare.zd.aok.de 1 2026-01-30 2026-01-30
login.zd.aok.de 1 2026-01-30 2026-01-30
transfer.zd.aok.de 1 2026-01-30 2026-01-30
pflege.aok.de 1 2026-01-22 2026-01-22
stage-pflege.aok.de 1 2026-01-22 2026-01-22
next-pflege.aok.de 1 2026-01-22 2026-01-22
stage-next-pflege.aok.de 1 2026-01-22 2026-01-22
dev-pflege.aok.de 1 2026-01-22 2026-01-22
zsavpn1.arge.aok.de 1 2026-01-22 2026-01-22

Showing the first 100 hostnames — sign in with GitHub or Google to page the full list, or use the API with an API key: GET /v1/hosts/aok.de.

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/aok.de.