These names usually front admin / internal / pre-production systems. A public certificate doesn't mean they're exposed, but it confirms they exist — worth a look.
api.mcp.github.comapi.security.github.comapi.stars.github.comdev.gtm.github.comjira.github.comsmtp.github.com
| Common name | Issuer | Names | Valid from | Age |
|---|---|---|---|---|
| dev.gtm.github.com | DigiCert Inc | 1 | 2026-06-15 | 5d |
| ducky.github.com | Let's Encrypt | 1 | 2026-06-15 | 5d |
| *.registry.github.com wildcard | Sectigo Limited | 2 | 2026-06-14 | 6d |
| livesend.github.com | Let's Encrypt | 1 | 2026-06-13 | 7d |
| gsnlink.github.com | Amazon | 1 | 2026-06-12 | 8d |
| *.github.com wildcard | Sectigo Limited | 2 | 2026-06-12 | 8d |
| github.com | Sectigo Limited | 2 | 2026-06-06 | 14d |
| *.pkg.github.com wildcard | Sectigo Limited | 2 | 2026-06-06 | 14d |
| *.review-lab.github.com wildcard | Sectigo Limited | 2 | 2026-06-06 | 14d |
| mailing.github.com | Sectigo Limited | 1 | 2026-06-06 | 14d |
| emails.github.com | Sectigo Limited | 1 | 2026-06-06 | 14d |
| ghicons.github.com | Let's Encrypt | 1 | 2026-06-05 | 14d |
| design-camp.github.com | Let's Encrypt | 1 | 2026-06-05 | 15d |
| *.github.com wildcard | Let's Encrypt | 2 | 2026-06-04 | 15d |
| *.proxima-review-lab.github.com wildcard | Let's Encrypt | 2 | 2026-06-04 | 15d |
| spotlights-feed.github.com | Let's Encrypt | 1 | 2026-06-03 | 17d |
| vpn-ca.iad.github.com | Let's Encrypt | 1 | 2026-05-29 | 21d |
| *.smtp.github.com wildcard | Sectigo Limited | 2 | 2026-05-30 | 21d |
| communication.github.com | ZeroSSL GmbH | 4 | 2026-05-29 | 22d |
| model-launchkit.github.com | Let's Encrypt | 1 | 2026-05-20 | 31d |
| asset-generator.github.com | Let's Encrypt | 1 | 2026-05-09 | 42d |
| awesome-copilot.github.com | Let's Encrypt | 1 | 2026-05-07 | 43d |
| bug-bash.github.com | Let's Encrypt | 1 | 2026-05-07 | 44d |
| copilot-reports.github.com | Let's Encrypt | 1 | 2026-05-05 | 46d |
| github.com | Sectigo Limited | 2 | 2026-05-05 | 46d |
| *.github.com wildcard | Sectigo Limited | 2 | 2026-05-05 | 46d |
| *.github.com wildcard | Sectigo Limited | 2 | 2026-05-04 | 47d |
| github.com | Sectigo Limited | 2 | 2026-05-04 | 47d |
| *.octocaptcha.review-lab.github.com wildcard | Sectigo Limited | 2 | 2026-05-04 | 47d |
| copilot-billing-preview.github.com | Let's Encrypt | 1 | 2026-05-01 | 49d |
| gameoff.github.com | Let's Encrypt | 1 | 2026-04-30 | 51d |
| ducky.github.com | Let's Encrypt | 1 | 2026-04-16 | 65d |
| *.registry.github.com wildcard | Sectigo Limited | 2 | 2026-04-16 | 65d |
| *.github.com wildcard | Sectigo Limited | 2 | 2026-04-14 | 67d |
| livesend.github.com | Let's Encrypt | 1 | 2026-04-12 | 69d |
| github.com | Sectigo Limited | 2 | 2026-04-08 | 73d |
| mailing.github.com | Sectigo Limited | 1 | 2026-04-08 | 73d |
| *.pkg.github.com wildcard | Sectigo Limited | 2 | 2026-04-08 | 73d |
| *.review-lab.github.com wildcard | Sectigo Limited | 2 | 2026-04-08 | 73d |
| *.github.com wildcard | Let's Encrypt | 2 | 2026-04-06 | 74d |
| *.proxima-review-lab.github.com wildcard | Let's Encrypt | 2 | 2026-04-06 | 74d |
| vpn-ca.iad.github.com | Let's Encrypt | 1 | 2026-03-31 | 80d |
| model-launchkit.github.com | Let's Encrypt | 1 | 2026-03-21 | 91d |
| asset-generator.github.com | Let's Encrypt | 1 | 2026-03-10 | 102d |
| awesome-copilot.github.com | Let's Encrypt | 1 | 2026-03-08 | 103d |
| bug-bash.github.com | Let's Encrypt | 1 | 2026-03-08 | 104d |
| github.com | Sectigo Limited | 2 | 2026-03-06 | 106d |
| *.github.com wildcard | Sectigo Limited | 2 | 2026-03-06 | 106d |
| gameoff.github.com | Let's Encrypt | 1 | 2026-03-01 | 110d |
| f.cloud.github.com | GlobalSign nv-sa | 1 | 2026-02-27 | 113d |
| *.registry.github.com wildcard | Sectigo Limited | 2 | 2026-02-16 | 124d |
| ducky.github.com | Let's Encrypt | 1 | 2026-02-14 | 126d |
| *.pkg.github.com wildcard | Sectigo Limited | 2 | 2026-02-08 | 132d |
| github.com | Sectigo Limited | 2 | 2026-02-08 | 132d |
| *.review-lab.github.com wildcard | Sectigo Limited | 2 | 2026-02-08 | 132d |
| mailing.github.com | Sectigo Limited | 1 | 2026-02-08 | 132d |
| livesend.github.com | Let's Encrypt | 1 | 2026-02-07 | 133d |
| *.github.com wildcard | Let's Encrypt | 2 | 2026-02-06 | 133d |
| model-launchkit.github.com | Let's Encrypt | 1 | 2026-01-20 | 151d |
| vpn-ca.iad.github.com | Sectigo Limited | 1 | 2026-01-18 | 153d |
| asset-generator.github.com | Let's Encrypt | 1 | 2026-01-08 | 163d |
| bug-bash.github.com | Let's Encrypt | 1 | 2026-01-07 | 164d |
| github.com | Sectigo Limited | 2 | 2026-01-06 | 165d |
| *.github.com wildcard | Sectigo Limited | 2 | 2026-01-06 | 165d |
| *.registry.github.com wildcard | Sectigo Limited | 2 | 2025-12-18 | 184d |
| ducky.github.com | Let's Encrypt | 1 | 2025-12-16 | 186d |
| mona-arcade.github.com | Let's Encrypt | 1 | 2025-12-12 | 190d |
| *.registry.github.com wildcard | Sectigo Limited | 2 | 2025-10-20 | 243d |
| garage.github.com | Sectigo Limited | 4 | 2025-09-15 | 278d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-09-08 | 285d |
| *.examregistration-uat-api.github.com wildcard | Sectigo Limited | 2 | 2025-09-08 | 285d |
| *.examregistration-api.github.com wildcard | Sectigo Limited | 2 | 2025-09-08 | 285d |
| *.examadmin.github.com wildcard | Sectigo Limited | 2 | 2025-09-08 | 285d |
| *.examadmin-uat.github.com wildcard | Sectigo Limited | 2 | 2025-09-05 | 288d |
| *.examadmin-uat.github.com wildcard | Sectigo Limited | 2 | 2025-09-03 | 290d |
| api.mcp.github.com | DigiCert Inc | 1 | 2025-08-22 | 302d |
| examadmin.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| examadmin-uat.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| support.enterprise.github.com | DigiCert Inc | 1 | 2025-07-31 | 324d |
| ws.support.github.com | DigiCert Inc | 1 | 2025-07-31 | 324d |
| api.security.github.com | DigiCert Inc | 1 | 2025-07-31 | 324d |
| examregistration-uat-api.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| examregistration-uat.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2025-07-31 | 324d |
| emails.github.com | Sectigo Limited | 1 | 2025-07-06 | 349d |
| import2.github.com | Sectigo Limited | 3 | 2025-07-02 | 353d |
| *.smtp.github.com wildcard | Sectigo Limited | 2 | 2025-06-29 | 356d |
| communication.github.com | DigiCert Inc | 4 | 2025-06-19 | 366d |
| communication.github.com | DigiCert Inc | 2 | 2025-06-18 | 367d |
| examadmin.github.com | DigiCert, Inc. | 1 | 2025-06-17 | 368d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-06-17 | 368d |
| examadmin-uat.github.com | DigiCert, Inc. | 1 | 2025-06-17 | 368d |
| examregistration-uat.github.com | DigiCert, Inc. | 1 | 2025-06-17 | 368d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-06-13 | 372d |
| examregistration-uat-api.github.com | DigiCert, Inc. | 1 | 2025-06-06 | 379d |
| *.github.com wildcard | Sectigo Limited | 2 | 2025-06-04 | 381d |
| *.octocaptcha.review-lab.github.com wildcard | Sectigo Limited | 2 | 2025-06-03 | 382d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2025-06-01 | 384d |
| *.github.com wildcard | Sectigo Limited | 2 | 2025-05-14 | 402d |
| f.cloud.github.com | GlobalSign nv-sa | 1 | 2025-04-26 | 420d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2025-03-14 | 463d |
| mailing.github.com | Sectigo Limited | 1 | 2025-03-10 | 467d |
| *.pkg.github.com wildcard | Sectigo Limited | 2 | 2025-03-10 | 467d |
| github.com | Sectigo Limited | 2 | 2025-03-10 | 467d |
| *.review-lab.github.com wildcard | Sectigo Limited | 2 | 2025-03-10 | 467d |
| *.github.com wildcard | Sectigo Limited | 3 | 2025-03-07 | 470d |
| github.com | Sectigo Limited | 2 | 2025-02-27 | 478d |
| vpn-ca.iad.github.com | Sectigo Limited | 1 | 2025-02-17 | 488d |
| *.github.com wildcard | Sectigo Limited | 2 | 2025-02-05 | 500d |
| github.com | Sectigo Limited | 2 | 2025-02-05 | 500d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-01-31 | 505d |
| examadmin-uat.github.com | DigiCert, Inc. | 1 | 2025-01-31 | 505d |
| examregistration-uat.github.com | DigiCert, Inc. | 1 | 2025-01-31 | 505d |
| examadmin.github.com | DigiCert, Inc. | 1 | 2025-01-31 | 505d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-01-27 | 509d |
| examregistration-uat-api.github.com | DigiCert, Inc. | 1 | 2025-01-20 | 516d |
| examregistration-uat.github.com | DigiCert, Inc. | 1 | 2025-01-20 | 516d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2025-01-15 | 521d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2025-01-15 | 521d |
| *.registry.github.com wildcard | Sectigo Limited | 2 | 2024-11-19 | 578d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2024-10-27 | 601d |
| garage.github.com | Sectigo Limited | 4 | 2024-10-15 | 613d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2024-09-12 | 646d |
| examregistration-uat-api.github.com | DigiCert, Inc. | 1 | 2024-09-05 | 653d |
| examregistration-uat.github.com | DigiCert, Inc. | 1 | 2024-09-05 | 653d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2024-08-29 | 660d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2024-08-29 | 660d |
| support.enterprise.github.com | Sectigo Limited | 1 | 2024-08-28 | 661d |
| ws.support.github.com | Sectigo Limited | 1 | 2024-08-28 | 661d |
| api.security.github.com | Sectigo Limited | 1 | 2024-08-27 | 662d |
| emails.github.com | Sectigo Limited | 1 | 2024-08-05 | 684d |
| import2.github.com | Sectigo Limited | 3 | 2024-08-01 | 688d |
| *.smtp.github.com wildcard | DigiCert Inc | 2 | 2024-07-30 | 690d |
| *.proxima-review-lab.github.com wildcard | DigiCert Inc | 2 | 2024-07-30 | 690d |
| communication.github.com | DigiCert Inc | 4 | 2024-07-18 | 702d |
| *.octocaptcha.review-lab.github.com wildcard | Sectigo Limited | 2 | 2024-07-03 | 717d |
| *.github.com wildcard | Sectigo Limited | 2 | 2024-06-24 | 726d |
| f.cloud.github.com | GlobalSign nv-sa | 1 | 2024-06-23 | 727d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2024-06-10 | 740d |
| *.github.com wildcard | DigiCert Inc | 2 | 2024-06-09 | 741d |
| communication.github.com | DigiCert Inc | 2 | 2024-05-19 | 762d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2024-04-26 | 785d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2024-04-12 | 799d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2024-04-12 | 799d |
| github.com | Sectigo Limited | 2 | 2024-04-09 | 802d |
| *.review-lab.github.com wildcard | Sectigo Limited | 2 | 2024-04-08 | 803d |
| *.pkg.github.com wildcard | Sectigo Limited | 2 | 2024-04-08 | 803d |
| vpn-ca.iad.github.com | Sectigo Limited | 1 | 2024-03-18 | 824d |
| *.github.com wildcard | DigiCert Inc | 3 | 2024-03-15 | 827d |
| vpn-ca.iad.github.com | Sectigo Limited | 1 | 2024-03-15 | 827d |
| *.github.com wildcard | Sectigo Limited | 2 | 2024-03-07 | 835d |
| github.com | Sectigo Limited | 2 | 2024-03-07 | 835d |
| github.com | Sectigo Limited | 2 | 2024-03-06 | 836d |
| *.github.com wildcard | Sectigo Limited | 2 | 2024-03-04 | 838d |
| github.com | TrusAuth Inc | 0 | 2024-03-03 | 839d |
| github.com | Sectigo Limited | 2 | 2024-02-28 | 843d |
| *.smtp.github.com wildcard | DigiCert Inc | 2 | 2024-02-02 | 869d |
| smtp.github.com | Sectigo Limited | 2 | 2024-02-02 | 869d |
| github.com | Sectigo Limited | 2 | 2024-02-02 | 869d |
| *.smtp.github.com wildcard | Sectigo Limited | 2 | 2024-02-02 | 869d |
| smtp.github.com | Sectigo Limited | 2 | 2024-02-02 | 869d |
| smtp.github.com | Sectigo Limited | 1 | 2024-01-31 | 871d |
| smtp.github.com | Sectigo Limited | 1 | 2024-01-31 | 871d |
| smtp.github.com | Sectigo Limited | 1 | 2024-01-30 | 872d |
| *.smtp.github.com wildcard | Sectigo Limited | 2 | 2024-01-26 | 876d |
| examregistration-api.github.com | DigiCert, Inc. | 1 | 2024-01-24 | 878d |
| *.registry.github.com wildcard | DigiCert Inc | 2 | 2023-12-20 | 913d |
| *.proxima-review-lab.github.com wildcard | DigiCert Inc | 2 | 2023-12-20 | 913d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2023-12-09 | 924d |
| garage.github.com | DigiCert Inc | 4 | 2023-11-15 | 948d |
| skyline.github.com | DigiCert Inc | 1 | 2023-11-02 | 961d |
| support.enterprise.github.com | DigiCert Inc | 1 | 2023-09-28 | 996d |
| ws.support.github.com | DigiCert Inc | 1 | 2023-09-28 | 996d |
| api.security.github.com | DigiCert Inc | 1 | 2023-09-27 | 997d |
| emails.github.com | DigiCert Inc | 1 | 2023-09-05 | 1019d |
| f.cloud.github.com | GlobalSign nv-sa | 1 | 2023-08-21 | 1034d |
| import2.github.com | DigiCert Inc | 3 | 2023-08-15 | 1040d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2023-07-22 | 1064d |
| *.github.com wildcard | DigiCert Inc | 2 | 2023-07-21 | 1065d |
| communication.github.com | DigiCert Inc | 4 | 2023-07-20 | 1066d |
| api.stars.github.com | DigiCert Inc | 1 | 2023-07-13 | 1073d |
| *.github.com wildcard | DigiCert Inc | 2 | 2023-07-07 | 1079d |
| *.review-lab.github.com wildcard | DigiCert Inc | 2 | 2023-04-24 | 1153d |
| github.com | DigiCert Inc | 2 | 2023-04-21 | 1156d |
| *.pkg.github.com wildcard | DigiCert Inc | 2 | 2023-03-16 | 1192d |
| examregistration.github.com | DigiCert, Inc. | 1 | 2023-03-04 | 1204d |
| vpn-ca.iad.github.com | DigiCert Inc | 1 | 2023-03-02 | 1206d |
| *.github.com wildcard | DigiCert Inc | 3 | 2023-02-21 | 1215d |
| *.github.com wildcard | DigiCert Inc | 2 | 2023-02-21 | 1215d |
| *.github.com wildcard | DigiCert Inc | 2 | 2023-02-16 | 1220d |
| *.smtp.github.com wildcard | DigiCert Inc | 2 | 2023-02-15 | 1221d |
| github.com | DigiCert Inc | 2 | 2023-02-14 | 1222d |
| *.smtp.github.com wildcard | DigiCert Inc | 2 | 2023-02-14 | 1222d |
| github.com | DigiCert Inc | 2 | 2023-02-14 | 1222d |
| *.smtp.github.com wildcard | DigiCert Inc | 2 | 2023-02-14 | 1222d |
| skyline.github.com | DigiCert Inc | 2 | 2023-01-10 | 1257d |
| *.proxima-review-lab.github.com wildcard | DigiCert Inc | 2 | 2023-01-05 | 1262d |
Hostnames seen in certificate SANs — a useful inventory of what's been exposed.
api.mcp.github.comapi.security.github.comapi.stars.github.comasset-generator.github.comatom-installer.github.comawesome-copilot.github.combranch.github.combrandguide.github.combug-bash.github.comcamo.github.comcentral.github.comcla.github.comclassroom.github.comcloud.github.comcodespaces-dev.github.comcodespaces-ppe.github.comcodespaces.github.comcommunication.github.comcommunity.github.comcopilot-billing-preview.github.comcopilot-reports.github.comdesign-camp.github.comdev.gtm.github.comdocs-front-door.github.comdocs.github.comdodgeball.github.comducky.github.comedu.github.comeducation.github.comemails.github.comenterprise.github.comexamadmin-uat.github.comexamadmin.github.comexamregistration-api.github.comexamregistration-uat-api.github.comexamregistration-uat.github.comexamregistration.github.comf.cloud.github.comfast.github.comgameoff.github.comgarage.github.comghicons.github.comgist.github.comgraphql-stage.github.comgraphql.github.comgsnlink.github.comhelp.github.comhelpnext.github.comhq.github.comid.github.comimport.github.comimport2.github.comimporter2.github.comjira.github.comjobs.github.comlab-sandbox.github.comlab.github.comlearn.github.comlivesend.github.comm.communication.github.commac-installer.github.commailing.github.commaintainers.github.commodel-launchkit.github.commona-arcade.github.comoctocaptcha.review-lab.github.comoctostatus-production.github.comoffer.github.compartnerportal.github.compkg.github.comporter.github.comporter2.github.comproxima-review-lab.github.comraw.github.comregistry.github.comrender-lab.github.comrender.github.comres.communication.github.comreview-lab.github.comrs.github.comschrauger.github.comskyline.github.comslack.github.comsmtp.github.comspotlights-feed.github.comstaging-lab.github.comstatus.github.comstg.github.comstyleguide.github.comsupport.enterprise.github.comt.communication.github.comtalks.github.comvisualstudio.github.comvpn-ca.iad.github.comvscode-auth.github.comworkspaces-dev.github.comworkspaces-ppe.github.comworkspaces.github.comws.support.github.comwww.api.security.github.comwww.api.stars.github.comwww.communication.github.comwww.github.comwww.graphql-stage.github.comwww.graphql.github.comwww.jira.github.comwww.maintainers.github.comwww.partnerportal.github.comwww.render-lab.github.comwww.skyline.github.comwww.smtp.github.comwww.support.enterprise.github.comwww.visualstudio.github.comwww.ws.support.github.com
Data from public Certificate Transparency logs via crt.sh. CT shows certificates that were issued, not necessarily currently in use.
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