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) · 198 ms

HostCertsFirst seenLast seen
o2.cz 2 2025-09-24 2025-10-30
*.o2.cz 1 2025-10-30 2025-10-30
dexchc2.o2.cz 2 2025-08-14 2026-08-03
cloud2.o2.cz 1 2026-02-05 2026-02-05
t-cloud2.o2.cz 1 2026-06-05 2026-06-05
killbill.t-cloud2.o2.cz 2 2026-05-09 2026-05-09
api.killbill.t-cloud2.o2.cz 2 2026-05-09 2026-05-09
ncp.t-cloud2.o2.cz 1 2026-04-14 2026-04-14
morpheus.t-cloud2.o2.cz 2 2026-05-18 2026-05-18
backup.cloud2.o2.cz 4 2025-08-27 2026-08-21
t-backup.cloud2.o2.cz 4 2025-08-27 2026-08-21
ops.cloud2.o2.cz 2 2026-03-30 2026-10-08
t-ops.cloud2.o2.cz 2 2026-03-30 2026-10-08
dexchc3.o2.cz 2 2025-08-14 2026-08-03
ca.o2.cz 5 2026-05-25 2026-09-22
exponea.o2.cz 3 2026-05-16 2026-08-30
api-exponea.o2.cz 3 2026-05-24 2026-09-10
cdn-exponea.o2.cz 3 2026-05-16 2026-09-04
160-218-129-250.rea.o2.cz 5 2026-04-25 2026-08-23
160-218-187-202.rea.o2.cz 5 2026-05-12 2026-09-09
160-218-121-6.rea.o2.cz 4 2026-06-01 2026-10-05
160-218-130-57.rea.o2.cz 5 2026-05-24 2026-09-22
objednavka.o2.cz 5 2026-05-13 2026-09-10
proxima.o2.cz 5 2026-05-03 2026-08-31
*.proxima.o2.cz 5 2026-05-03 2026-08-31
api.test-make21.gcloud.proxima.o2.cz 40 2026-04-13 2026-10-05
csr.test-make21.gcloud.proxima.o2.cz 41 2026-04-13 2026-10-05
api.production.gcloud.proxima.o2.cz 40 2026-04-13 2026-10-05
csr.production.gcloud.proxima.o2.cz 40 2026-04-13 2026-10-05
touch-stage.proxima.o2.cz 5 2026-04-29 2026-08-27
api.stage.proxima.o2.cz 4 2026-04-13 2026-08-11
mo2-api.stage.proxima.o2.cz 40 2026-04-13 2026-10-05
eip-api.stage.proxima.o2.cz 40 2026-04-13 2026-10-05
adm.stage.proxima.o2.cz 40 2026-04-13 2026-10-05
partners.stage.proxima.o2.cz 40 2026-04-13 2026-10-05
support.stage.proxima.o2.cz 40 2026-04-13 2026-10-05
api.proxima.o2.cz 4 2026-04-13 2026-08-11
mo2-api.proxima.o2.cz 40 2026-04-13 2026-10-05
eip-api.proxima.o2.cz 40 2026-04-13 2026-10-05
adm.proxima.o2.cz 40 2026-04-13 2026-10-05
support.proxima.o2.cz 40 2026-04-13 2026-10-05
o2smsbrana.o2.cz 2 2026-03-04 2026-08-27
www.o2smsbrana.o2.cz 2 2026-03-04 2026-08-27
kariera.o2.cz 1 2026-07-02 2026-07-02
admin.kariera.o2.cz 1 2026-07-02 2026-07-02
www.kariera.o2.cz 1 2026-07-02 2026-07-02
media.api.o2tvhub.o2.cz 5 2026-05-17 2026-09-15
reco.api.o2tvhub.o2.cz 5 2026-04-22 2026-08-20
rr.reco.api.o2tvhub.o2.cz 4 2026-04-20 2026-08-18
carousel.o2tvhub.o2.cz 5 2026-05-29 2026-09-26
data.cdn.o2tvhub.o2.cz 9 2026-04-18 2026-09-30
files.cdn.o2tvhub.o2.cz 9 2026-04-18 2026-09-30
fdcc.o2.cz 5 2026-05-08 2026-09-05
*.ssl-dc.o2.cz 1 2026-02-03 2026-02-03
sec.o2.cz 1 2026-01-19 2026-01-19
web.sec.o2.cz 1 2026-01-19 2026-01-19
ctc.o2.cz 1 2026-05-12 2026-05-12
od.o2.cz 3 2026-06-19 2026-08-27
ems01-cyberguard.o2.cz 1 2025-12-04 2025-12-04
*.ems01-cyberguard.o2.cz 1 2025-12-04 2025-12-04
cloud.o2.cz 1 2026-05-25 2026-05-25
*.cloud.o2.cz 1 2026-05-25 2026-05-25
mujcloud.o2.cz 2 2026-09-08 2026-09-08
upload.mujcloud.o2.cz 2 2026-09-08 2026-09-08
www.mujcloud.o2.cz 2 2026-09-08 2026-09-08
korporace.o2.cz 8 2026-05-10 2026-09-27
pece.o2.cz 4 2026-04-19 2026-09-04
digitalsignage.o2.cz 7 2025-07-30 2026-06-03
www.digitalsignage.o2.cz 1 2025-07-30 2025-07-30
m.moje.o2.cz 5 2026-05-02 2026-08-30
app.moje.o2.cz 7 2026-05-20 2026-09-14
88-100-228-20.rcf.o2.cz 3 2026-06-21 2026-09-21
pf.o2.cz 5 2026-04-26 2026-08-24
88-101-1-138.rcg.o2.cz 7 2026-04-26 2026-08-30
blog.o2.cz 5 2026-05-13 2026-09-10
admin.blog.o2.cz 5 2026-05-13 2026-09-10
dexch.o2.cz 2 2025-08-14 2026-08-03
zalohovani.o2.cz 3 2025-10-07 2026-10-01
www.dobijeni.o2.cz 5 2026-05-10 2026-09-08
lnk.o2.cz 1 2025-11-09 2025-11-09
network.o2.cz 5 2026-04-23 2026-08-21
*.network.o2.cz 5 2026-04-23 2026-08-21
kissdesk.o2.cz 5 2026-05-11 2026-09-09
te300.cpten01.captiveportal.o2.cz 5 2026-05-29 2026-09-26
te410.cpten01.captiveportal.o2.cz 5 2026-05-25 2026-09-22
te120.cpten01.captiveportal.o2.cz 5 2026-05-19 2026-09-16
te320.cpten01.captiveportal.o2.cz 5 2026-05-31 2026-09-28
te130.cpten01.captiveportal.o2.cz 5 2026-05-19 2026-09-16
te330.cpten01.captiveportal.o2.cz 5 2026-05-30 2026-09-27
te430.cpten01.captiveportal.o2.cz 5 2026-05-27 2026-09-24
te140.cpten01.captiveportal.o2.cz 4 2026-06-06 2026-10-04
te440.cpten01.captiveportal.o2.cz 5 2026-05-12 2026-09-09
te50.cpten01.captiveportal.o2.cz 6 2026-05-04 2026-09-01
te160.cpten01.captiveportal.o2.cz 5 2026-05-22 2026-09-19
te360.cpten01.captiveportal.o2.cz 5 2026-06-01 2026-09-29
te180.cpten01.captiveportal.o2.cz 5 2026-05-22 2026-09-19
te280.cpten01.captiveportal.o2.cz 5 2026-05-26 2026-09-23
4132980.cpten01.captiveportal.o2.cz 5 2026-05-05 2026-09-02
te80.cpten01.captiveportal.o2.cz 4 2026-06-10 2026-10-08
te101.cpten01.captiveportal.o2.cz 5 2026-05-16 2026-09-13

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/o2.cz.

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/o2.cz.