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) · 209 ms

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HostCertsFirst seenLast seen
op.fi 3 2026-03-09 2026-08-13
secure01.op.fi 3 2025-08-01 2026-08-17
www.secure01.op.fi 3 2025-08-01 2026-08-17
silta.wsmobdom.HE1.op.fi 1 2026-03-09 2026-03-09
www.silta.wsmobdom.HE1.op.fi 1 2026-03-09 2026-03-09
silta.wsopfidom.HE1.op.fi 1 2026-03-05 2026-03-05
www.silta.wsopfidom.HE1.op.fi 1 2026-03-05 2026-03-05
silta.lompsadom.ES1.op.fi 1 2026-01-07 2026-01-07
silta.wsmobdom.ES1.op.fi 1 2026-02-18 2026-02-18
www.silta.wsmobdom.ES1.op.fi 1 2026-02-18 2026-02-18
silta.wsopfidom.ES1.op.fi 1 2026-03-31 2026-03-31
sbc1.op.fi 3 2025-08-21 2026-09-17
www.sbc1.op.fi 3 2025-08-21 2026-09-17
silta.lompsadom.he1.op.fi 1 2025-12-30 2025-12-30
www.silta.lompsadom.he1.op.fi 1 2025-12-30 2025-12-30
tok1.op.fi 2 2025-09-30 2026-03-06
www.tok1.op.fi 2 2025-09-30 2026-03-06
www.silta.lompsadom.es1.op.fi 1 2026-01-07 2026-01-07
silta.wsopfidom.es1.op.fi 1 2026-09-22 2026-09-22
www.silta.wsopfidom.es1.op.fi 2 2026-03-31 2026-09-22
sbc2.op.fi 2 2025-08-21 2026-09-17
www.sbc2.op.fi 2 2025-08-21 2026-09-17
tok2.op.fi 2 2025-09-30 2026-03-06
tes3.op.fi 2 2025-09-18 2026-03-05
www.tes3.op.fi 2 2025-09-18 2026-03-05
tes4.op.fi 2 2025-09-18 2026-03-05
www4.op.fi 1 2026-03-04 2026-03-04
www.www4.op.fi 1 2026-03-04 2026-03-04
lainaa.op.fi 2 2025-09-03 2026-08-13
pilot.lainaa.op.fi 1 2025-10-15 2025-10-15
www.pilot.lainaa.op.fi 1 2025-10-15 2025-10-15
www.lainaa.op.fi 2 2025-09-03 2026-08-13
baltics.sca.op.fi 1 2026-03-11 2026-03-11
cert-baltics.sca.op.fi 1 2026-02-25 2026-02-25
www.cert-baltics.sca.op.fi 1 2026-02-25 2026-02-25
www.baltics.sca.op.fi 1 2026-03-11 2026-03-11
historia.op.fi 13 2026-02-25 2026-09-09
www.historia.op.fi 16 2026-02-25 2026-10-12
op-ryhma.op.fi 8 2026-04-24 2026-08-20
uusi.lompsa.op.fi 1 2026-03-10 2026-03-10
www.uusi.lompsa.op.fi 1 2026-03-10 2026-03-10
marketdata.op.fi 1 2026-02-18 2026-02-18
www.marketdata.op.fi 1 2026-02-18 2026-02-18
hae-korvausta.op.fi 2 2025-10-04 2026-09-03
saavutettava.op.fi 1 2026-03-09 2026-03-09
www.saavutettava.op.fi 1 2026-03-09 2026-03-09
webb.op.fi 2 2025-08-25 2026-03-11
isb.op.fi 2 2026-02-20 2026-02-20
opmqssb.op.fi 1 2025-11-18 2025-11-18
www.opmqssb.op.fi 1 2025-11-18 2025-11-18
brand.op.fi 13 2026-02-25 2026-08-22
wsdomain14-s-prod.op.fi 1 2026-01-29 2026-01-29
www.wsdomain14-s-prod.op.fi 1 2026-01-29 2026-01-29
opctmprod.op.fi 1 2026-06-11 2026-06-11
www.opctmprod.op.fi 1 2026-06-11 2026-06-11
fdmqgwprod.op.fi 1 2026-05-12 2026-05-12
www.fdmqgwprod.op.fi 1 2026-05-12 2026-05-12
isam-web.opcloud.op.fi 1 2025-11-28 2025-11-28
www.isam-web.opcloud.op.fi 1 2025-11-28 2025-11-28
isam-mob.opcloud.op.fi 1 2025-11-27 2025-11-27
www.isam-mob.opcloud.op.fi 1 2025-11-27 2025-11-27
isam-mgmt-fed.opcloud.op.fi 1 2025-10-15 2025-10-15
isam-mgmt.opcloud.op.fi 1 2025-11-28 2025-11-28
www.isam-mgmt.opcloud.op.fi 1 2025-11-28 2025-11-28
uutiskirje.op.fi 5 2026-05-04 2026-09-02
ceye.op.fi 1 2026-02-11 2026-02-11
neteye.op.fi 1 2026-02-11 2026-02-11
authorize.op.fi 1 2026-03-03 2026-03-03
mobile.authorize.op.fi 1 2025-11-17 2025-11-17
www.mobile.authorize.op.fi 1 2025-11-17 2025-11-17
www.authorize.op.fi 1 2026-03-03 2026-03-03
push.op.fi 1 2026-02-18 2026-02-18
www.push.op.fi 1 2026-02-18 2026-02-18
oauth.op.fi 1 2026-06-10 2026-06-10
www.oauth.op.fi 1 2026-06-10 2026-06-10
webi.op.fi 2 2025-08-25 2026-03-11
mobiili.op.fi 2 2025-10-08 2025-11-10
api.azure.corporate-api.op.fi 1 2026-09-24 2026-09-24
admin.azure.corporate-api.op.fi 2 2026-09-24 2026-09-24
api.sandbox.azure.corporate-api.op.fi 2 2026-09-25 2026-09-25
admin.sandbox.azure.corporate-api.op.fi 3 2026-09-25 2026-09-25
api.corporate-api.op.fi 2 2026-03-11 2026-09-24
www.api.corporate-api.op.fi 1 2026-03-11 2026-03-11
admin.corporate-api.op.fi 4 2025-12-23 2026-09-24
www.admin.corporate-api.op.fi 1 2026-03-10 2026-03-10
api.sandbox.corporate-api.op.fi 3 2026-09-22 2026-09-25
admin.sandbox.corporate-api.op.fi 5 2026-09-21 2026-09-25
vuosi.op.fi 15 2026-02-25 2026-09-07
www.vuosi.op.fi 10 2026-06-03 2026-09-29
uusi.op.fi 1 2026-03-09 2026-03-09
www.uusi.op.fi 1 2026-03-09 2026-03-09
amlsimulointi.op.fi 2 2025-08-21 2026-03-11
www.amlsimulointi.op.fi 2 2025-08-21 2026-03-11
wsk.asiakastesti.op.fi 1 2026-03-10 2026-03-10
www.wsk.asiakastesti.op.fi 1 2026-03-10 2026-03-10
wsk.extranet.asiakastesti.op.fi 1 2025-11-14 2025-11-14
www.wsk.extranet.asiakastesti.op.fi 1 2025-11-14 2025-11-14
wsk.op.fi 2 2025-08-22 2026-03-05
www.wsk.op.fi 2 2025-08-22 2026-03-05
test.thirdpartyportal.op.fi 2 2026-10-12 2026-10-12

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/op.fi.

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/op.fi.