Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts, first/last seen and live DNS status.

100 hosts (first page) · 372 ms

HostCertsFirst seenLast seenDNS
ef.com 49 2026-02-02 2026-09-26 ok
*.ef.com 119 2025-07-03 2026-09-26 —
phishing-resistant-mfa.ef.com 11 2026-05-26 2026-09-22 ok
media.ef.com 3 2026-06-01 2026-08-10 ok
qa.ef.com 20 2026-05-05 2026-10-02 ok
virtualoffice-qa.ef.com 11 2025-08-02 2026-09-24 ok
*.virtualoffice-qa.ef.com 8 2026-05-11 2026-09-24 —
api.virtualoffice-qa.ef.com 1 2026-01-26 2026-01-26 ok
*.api.virtualoffice-qa.ef.com 1 2026-01-26 2026-01-26 —
stargate-qa.ef.com 39 2026-04-14 2026-09-21 ok
*.stargate-qa.ef.com 15 2026-04-16 2026-09-21 —
api.stargate-qa.ef.com 8 2026-04-16 2026-08-12 ok
proxy.stargate-qa.ef.com 9 2026-04-16 2026-08-12 ok
data-api-qa.ef.com 2 2025-11-17 2025-12-12 ok
forms-qa.ef.com 3 2025-07-11 2026-06-11 ok
*.qa.ef.com 9 2026-05-19 2026-10-02 —
data-api.qa.ef.com 1 2025-07-14 2025-07-14 nxdomain
ctqa.ef.com 6 2026-05-04 2026-08-30 ok
efekta.ef.com 24 2026-05-11 2026-09-07 nodata
*.efekta.ef.com 24 2026-05-11 2026-09-07 —
ai.efekta.ef.com 6 2025-09-18 2026-08-19 nodata
*.ai.efekta.ef.com 6 2025-09-18 2026-08-19 —
staging.ai.efekta.ef.com 6 2025-09-18 2026-08-19 nodata
*.staging.ai.efekta.ef.com 6 2025-09-18 2026-08-19 —
sandbox.ai.efekta.ef.com 6 2025-09-18 2026-08-19 nodata
*.sandbox.ai.efekta.ef.com 6 2025-09-18 2026-08-19 —
b2s.efekta.ef.com 6 2025-09-17 2026-08-18 nodata
*.b2s.efekta.ef.com 18 2025-09-17 2026-09-19 —
qa.b2s.efekta.ef.com 6 2025-09-17 2026-08-18 nodata
*.qa.b2s.efekta.ef.com 18 2025-09-17 2026-09-19 —
dev.b2s.efekta.ef.com 6 2025-09-17 2026-08-18 nodata
*.dev.b2s.efekta.ef.com 18 2025-09-17 2026-09-19 —
*.study.dev.efekta.ef.com 8 2026-05-12 2026-09-07 —
api.study.dev.efekta.ef.com 3 2025-09-18 2026-08-19 ok
*.api.study.dev.efekta.ef.com 3 2025-09-18 2026-08-19 —
*.study.efekta.ef.com 8 2026-05-12 2026-09-07 —
api.study.efekta.ef.com 3 2025-09-18 2026-08-19 ok
*.api.study.efekta.ef.com 3 2025-09-18 2026-08-19 —
esign-hub.ef.com 1 2026-06-23 2026-06-23 ok
integration-hub.ef.com 3 2026-01-28 2026-07-09 ok
brandhub.ef.com 5 2026-05-22 2026-09-25 ok
efbrandhub.ef.com 5 2026-05-22 2026-09-21 ok
marketinghub.ef.com 6 2026-04-13 2026-08-10 ok
centralhub.ef.com 5 2026-04-23 2026-08-25 ok
bc.ef.com 4 2025-08-07 2026-07-08 ok
evc.ef.com 30 2025-07-16 2026-09-08 ok
*.evc.ef.com 30 2025-07-16 2026-09-08 —
dev-dr.evc.ef.com 3 2026-09-11 2026-09-11 ok
*.dev-dr.evc.ef.com 3 2026-09-11 2026-09-11 —
dev.evc.ef.com 2 2025-06-16 2026-05-17 ok
*.dev.evc.ef.com 14 2025-06-16 2026-09-08 —
addi-us.dev.evc.ef.com 2 2026-06-08 2026-06-08 ok
ad.ef.com 18 2026-04-13 2026-09-16 ok
*.ad.ef.com 18 2026-04-13 2026-09-16 —
mycourseabroad.ef.com 2 2025-07-20 2026-06-20 ok
brand.ef.com 5 2026-05-20 2026-09-24 ok
mcloud.ef.com 1 2025-11-06 2025-11-06 ok
api.workspace.ef.com 1 2025-11-12 2025-11-12 ok
virtualoffice.ef.com 10 2025-08-04 2026-09-17 ok
*.virtualoffice.ef.com 7 2026-05-12 2026-09-17 —
api.virtualoffice.ef.com 1 2026-01-26 2026-01-26 ok
*.api.virtualoffice.ef.com 1 2026-01-26 2026-01-26 —
mta-sts.service.ef.com 2 2026-04-12 2026-09-12 ok
image.ef.com 3 2025-11-03 2026-01-07 ok
moxie.ef.com 1 2026-03-02 2026-03-02 ok
teachonline.ef.com 2 2025-08-20 2026-06-26 ok
*.teachonline.ef.com 2 2025-08-20 2026-06-26 —
qa.teachonline.ef.com 4 2025-08-20 2026-06-25 ok
*.qa.teachonline.ef.com 4 2025-08-20 2026-06-25 —
preview.qa.teachonline.ef.com 1 2025-08-20 2025-08-20 nxdomain
*.preview.qa.teachonline.ef.com 1 2025-08-20 2025-08-20 —
www.qa.teachonline.ef.com 1 2026-06-25 2026-06-25 ok
*.www.qa.teachonline.ef.com 1 2026-06-25 2026-06-25 —
dev.teachonline.ef.com 4 2025-08-20 2026-05-20 nodata
*.dev.teachonline.ef.com 4 2025-08-20 2026-05-20 —
campuscore.ef.com 23 2026-05-05 2026-09-01 ok
*.campuscore.ef.com 23 2026-05-05 2026-09-01 —
explore.ef.com 5 2026-05-28 2026-09-25 ok
store.ef.com 5 2026-05-10 2026-09-09 ok
www.store.ef.com 5 2026-05-10 2026-09-09 ok
culture.ef.com 1 2026-08-18 2026-08-18 ok
stargate.ef.com 44 2026-04-13 2026-10-07 ok
*.stargate.ef.com 18 2026-05-21 2026-10-03 —
api.stargate.ef.com 6 2026-05-21 2026-09-16 ok
proxy.stargate.ef.com 6 2026-05-21 2026-09-16 ok
cape.corporate.ef.com 3 2025-09-18 2026-08-19 nodata
*.cape.corporate.ef.com 3 2025-09-18 2026-08-19 —
staging.cape.corporate.ef.com 2 2025-08-26 2026-07-27 nodata
*.staging.cape.corporate.ef.com 2 2025-08-26 2026-07-27 —
sandbox.cape.corporate.ef.com 2 2025-06-30 2026-05-31 nodata
*.sandbox.cape.corporate.ef.com 2 2025-06-30 2026-05-31 —
reporting.corporate.ef.com 26 2026-02-25 2026-09-30 ok
*.reporting.corporate.ef.com 26 2026-02-25 2026-09-30 —
qa.reporting.corporate.ef.com 2 2026-02-25 2026-07-28 ok
*.qa.reporting.corporate.ef.com 2 2026-02-25 2026-07-28 —
prod.reporting.corporate.ef.com 2 2026-02-25 2026-02-25 ok
*.prod.reporting.corporate.ef.com 2 2026-02-25 2026-02-25 —
learn.corporate.ef.com 19 2026-04-13 2026-09-23 ok
*.learn.corporate.ef.com 19 2026-04-13 2026-09-23 —
qa.learn.corporate.ef.com 20 2026-04-14 2026-09-14 ok

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/ef.com.

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/ef.com.