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) · 247 ms

HostCertsFirst seenLast seen
os.uk 3 2025-07-18 2026-02-20
*.os.uk 2 2025-07-18 2025-12-15
orca.os.uk 1 2025-09-30 2025-09-30
*.orca.os.uk 1 2025-09-30 2025-09-30
psga.os.uk 23 2026-04-23 2026-10-01
*.psga.os.uk 12 2026-06-05 2026-10-01
gina.os.uk 1 2025-10-10 2025-10-10
*.gina.os.uk 1 2025-10-10 2025-10-10
live.gina.os.uk 3 2026-10-05 2026-10-06
dev.gina.os.uk 2 2026-08-04 2026-08-04
mira.os.uk 4 2026-04-23 2026-08-17
miratst2api.mira.os.uk 4 2026-04-22 2026-08-16
osdatahub.os.uk 3 2026-01-20 2026-06-12
www.osdatahub.os.uk 1 2026-01-21 2026-01-21
astrid.os.uk 2 2026-03-06 2026-07-18
filecloud.os.uk 2 2026-06-23 2026-06-23
brandguide.os.uk 2 2025-07-17 2026-06-16
osinsightscheme.os.uk 2 2026-05-07 2026-10-07
osleisure.os.uk 21 2026-04-20 2026-10-01
*.osleisure.os.uk 14 2026-04-22 2026-10-01
datahub-tst2.omse.os.uk 3 2026-02-11 2026-08-12
datahub-dev2.omse.os.uk 4 2026-03-11 2026-08-12
datahub-prd.omse.os.uk 2 2026-01-20 2026-06-12
datahub-stg.omse.os.uk 1 2026-06-11 2026-06-11
datahub-pr.omse.os.uk 4 2026-03-03 2026-08-12
datahub-uat.omse.os.uk 1 2026-06-11 2026-06-11
datahub-tst.omse.os.uk 4 2026-03-11 2026-08-12
datahub-dev.omse.os.uk 4 2026-03-10 2026-08-12
corporate.os.uk 34 2026-04-20 2026-10-02
*.corporate.os.uk 21 2026-06-06 2026-10-02
ite.os.uk 1 2025-12-12 2025-12-12
data-ite.os.uk 4 2026-06-04 2026-07-08
auth.data-ite.os.uk 4 2026-06-04 2026-07-08
api.data-ite.os.uk 2 2026-05-29 2026-07-07
admin.api.data-ite.os.uk 2 2026-05-29 2026-07-07
explorer.data-ite.os.uk 4 2026-06-04 2026-07-08
account.data-ite.os.uk 4 2026-06-04 2026-07-08
*.ite.os.uk 1 2025-12-12 2025-12-12
osdatahub.ite.os.uk 1 2026-06-10 2026-06-10
downloadzipping.ite.os.uk 3 2026-02-07 2026-09-22
pricinglicensing.os.uk 31 2026-04-22 2026-10-04
*.pricinglicensing.os.uk 20 2026-04-22 2026-10-04
cpwaftesting.os.uk 5 2026-07-29 2026-09-24
api.os.uk 1 2026-01-09 2026-01-09
www.api.os.uk 1 2026-01-09 2026-01-09
mta-sts.osi.os.uk 1 2026-03-29 2026-03-29
www.mta-sts.osi.os.uk 1 2026-03-29 2026-03-29
erom.os.uk 1 2026-09-25 2026-09-25
*.erom.os.uk 3 2026-09-04 2026-09-25
azurene.vpn.os.uk 1 2025-12-15 2025-12-15
www.azurene.vpn.os.uk 1 2025-12-15 2025-12-15
azureuk.vpn.os.uk 1 2025-11-03 2025-11-03
www.azureuk.vpn.os.uk 1 2025-11-03 2025-11-03
ap.vpn.os.uk 1 2026-01-08 2026-01-08
www.ap.vpn.os.uk 1 2026-01-08 2026-01-08
azurefr.vpn.os.uk 1 2025-12-22 2025-12-22
www.azurefr.vpn.os.uk 1 2025-12-22 2025-12-22
spatialstudio.os.uk 1 2026-07-23 2026-07-23
osnetshop.os.uk 2 2026-07-14 2026-07-14
gspp.os.uk 2 2025-09-09 2026-09-01
*.gspp.os.uk 2 2025-09-09 2026-09-01
trn3-qms.gspp.os.uk 2 2026-03-02 2026-07-19
infr.os.uk 1 2026-05-29 2026-05-29
*.infr.os.uk 1 2026-05-29 2026-05-29
psas.os.uk 2 2026-08-24 2026-08-24
*.psas.os.uk 2 2026-08-24 2026-08-24
dev-api.psas.os.uk 4 2026-09-17 2026-10-05
www.dev-api.psas.os.uk 2 2026-09-17 2026-09-17
data-orbs.os.uk 6 2026-07-07 2026-08-13
api.nxorbc9ba0.data-orbs.os.uk 1 2026-10-02 2026-10-02
admin.api.nxorbc9ba0.data-orbs.os.uk 1 2026-10-02 2026-10-02
api.nxorbd6cc0.data-orbs.os.uk 2 2026-08-24 2026-08-24
admin.api.nxorbd6cc0.data-orbs.os.uk 2 2026-08-24 2026-08-24
api.nxorb973f0.data-orbs.os.uk 1 2026-09-24 2026-09-24
admin.api.nxorb973f0.data-orbs.os.uk 2 2026-09-24 2026-09-24
api.nxorb84c21.data-orbs.os.uk 2 2026-09-25 2026-09-25
admin.api.nxorb84c21.data-orbs.os.uk 2 2026-09-25 2026-09-25
xporb3c291.data-orbs.os.uk 1 2026-09-07 2026-09-07
auth.xporb3c291.data-orbs.os.uk 1 2026-09-07 2026-09-07
explorer.xporb3c291.data-orbs.os.uk 1 2026-09-07 2026-09-07
account.xporb3c291.data-orbs.os.uk 1 2026-09-07 2026-09-07
api.nxorbf9a02.data-orbs.os.uk 1 2026-09-29 2026-09-29
admin.api.nxorbf9a02.data-orbs.os.uk 1 2026-09-29 2026-09-29
api.nxorb9b212.data-orbs.os.uk 2 2026-08-21 2026-08-21
admin.api.nxorb9b212.data-orbs.os.uk 2 2026-08-21 2026-08-21
api.nxorb3cb12.data-orbs.os.uk 2 2026-09-24 2026-09-24
admin.api.nxorb3cb12.data-orbs.os.uk 2 2026-09-24 2026-09-24
api.nxorbd1372.data-orbs.os.uk 1 2026-10-08 2026-10-08
admin.api.nxorbd1372.data-orbs.os.uk 1 2026-10-08 2026-10-08
xporb3f592.data-orbs.os.uk 1 2026-10-08 2026-10-08
auth.xporb3f592.data-orbs.os.uk 1 2026-10-08 2026-10-08
explorer.xporb3f592.data-orbs.os.uk 1 2026-10-08 2026-10-08
account.xporb3f592.data-orbs.os.uk 1 2026-10-08 2026-10-08
api.nxorba77d2.data-orbs.os.uk 1 2026-10-05 2026-10-05
admin.api.nxorba77d2.data-orbs.os.uk 1 2026-10-05 2026-10-05
api.nxorbc2c13.data-orbs.os.uk 1 2026-10-07 2026-10-07
admin.api.nxorbc2c13.data-orbs.os.uk 1 2026-10-07 2026-10-07
api.nxorb13423.data-orbs.os.uk 1 2026-10-02 2026-10-02
admin.api.nxorb13423.data-orbs.os.uk 1 2026-10-02 2026-10-02
api.nxorb59a33.data-orbs.os.uk 2 2026-08-21 2026-08-21

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/os.uk.

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/os.uk.