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) · 462 ms

HostCertsFirst seenLast seenDNS
xfinity.com 15 2025-12-23 2026-10-05 ok
*.xfinity.com 6 2025-06-23 2026-06-07 —
jss-build.stg10.xfinity.com 5 2025-09-26 2026-08-27 nxdomain
jss.stg10.xfinity.com 5 2025-09-26 2026-08-27 nxdomain
cms10.xfinity.com 5 2025-09-26 2026-08-27 ok
jss-build.dev10.xfinity.com 5 2025-09-26 2026-08-27 nxdomain
jss.dev10.xfinity.com 5 2025-09-26 2026-08-27 nxdomain
xm360.xfinity.com 4 2026-03-17 2026-10-06 ok
xapi.qa1.xfinity.com 2 2025-12-10 2026-03-06 ok
services.qa1.xfinity.com 2 2025-12-10 2026-03-06 ok
www.qa1.xfinity.com 2 2025-12-10 2026-03-06 ok
doh1.xfinity.com 1 2026-05-06 2026-05-06 ok
cms9.ft1.xfinity.com 4 2025-09-26 2026-06-18 nodata
cms9-build.ft1.xfinity.com 4 2025-09-26 2026-06-18 nodata
jss-build.ft1.xfinity.com 5 2025-09-26 2026-08-27 nodata
jss.ft1.xfinity.com 5 2025-09-26 2026-08-27 nodata
xapi.qa2.xfinity.com 2 2025-12-10 2026-03-06 ok
services.qa2.xfinity.com 2 2025-12-10 2026-03-06 ok
www.qa2.xfinity.com 2 2025-12-10 2026-03-06 ok
doh2.gslb2.xfinity.com 4 2026-04-16 2026-09-28 ok
xhmonapi.gslb2.xfinity.com 4 2025-08-11 2026-07-06 ok
xhmon.gslb2.xfinity.com 4 2025-08-11 2026-07-06 ok
upload-qa-cvr.gslb2.xfinity.com 14 2025-08-18 2026-07-20 nxdomain
www.upload-qa-cvr.gslb2.xfinity.com 14 2025-08-18 2026-07-20 nxdomain
livecache-qa-cvr.gslb2.xfinity.com 13 2025-10-01 2026-09-30 ok
playback-qa-cvr.gslb2.xfinity.com 13 2025-08-28 2025-12-01 nxdomain
www.playback-qa-cvr.gslb2.xfinity.com 13 2025-08-28 2025-12-01 nxdomain
livecache-cvr.gslb2.xfinity.com 3 2026-05-04 2026-06-03 ok
livecache-stg-cvr.gslb2.xfinity.com 4 2025-11-11 2026-05-14 ok
vrex.gslb2.xfinity.com 6 2025-07-14 2026-09-22 ok
search2.xfinity.com 14 2025-07-22 2026-08-20 nxdomain
pds2.xfinity.com 1 2026-04-22 2026-04-22 nxdomain
xapi.qa3.xfinity.com 2 2025-12-10 2026-03-06 ok
services.qa3.xfinity.com 2 2025-12-10 2026-03-06 ok
www.qa3.xfinity.com 2 2025-12-10 2026-03-06 ok
*.xc3.xfinity.com 3 2025-12-04 2025-12-10 —
secure.xc3.xfinity.com 9 2026-04-11 2026-09-13 ok
secure-staging.xc3.xfinity.com 9 2026-05-03 2026-10-05 ok
auth.xc3.xfinity.com 1 2025-12-04 2025-12-04 ok
pop3.xfinity.com 2 2026-04-14 2026-09-15 nxdomain
xdn-qa4.xfinity.com 1 2026-06-22 2026-06-22 ok
voice-prod.gslb4.xfinity.com 5 2025-07-14 2026-09-22 ok
sfp-config-1p.gslb4.xfinity.com 1 2025-12-10 2025-12-10 ok
sfp-recordingvalidations-api-1p.gslb4.xfinity.com 1 2025-07-08 2025-07-08 ok
sfp-1p.gslb4.xfinity.com 2 2025-07-08 2026-06-17 ok
streamworks-1p.gslb4.xfinity.com 1 2025-12-10 2025-12-10 ok
streamworks-next-1p.gslb4.xfinity.com 1 2025-12-10 2025-12-10 ok
cms8.xfinity.com 2 2026-03-24 2026-09-25 ok
cms9.xfinity.com 5 2025-09-26 2026-08-27 nodata
xm360-payment-uat-a.xfinity.com 1 2025-11-04 2025-11-04 nodata
connect-alpha.xfinity.com 1 2026-07-25 2026-07-25 ok
spa.xfinity.com 2 2025-09-09 2026-08-28 ok
xm360-qa.xfinity.com 10 2025-09-05 2026-05-21 nodata
oauth-qa.xfinity.com 11 2025-09-18 2026-10-01 ok
digital-qa.xfinity.com 5 2025-09-29 2026-08-17 ok
care-portal-qa.xfinity.com 1 2026-06-22 2026-06-22 ok
xtv-pil-qa.xfinity.com 1 2026-06-22 2026-06-22 ok
idm-qa.xfinity.com 11 2025-09-18 2026-10-01 ok
xdn-qa.xfinity.com 1 2026-06-22 2026-06-22 nxdomain
login-qa.xfinity.com 11 2025-09-18 2026-10-01 ok
sso-qa.xfinity.com 3 2025-09-15 2026-08-17 nxdomain
register-qa.xfinity.com 3 2025-10-09 2026-09-30 ok
xwifipass-qa.xfinity.com 5 2025-09-29 2026-08-17 ok
secure.qa.xfinity.com 14 2025-07-22 2026-08-20 nxdomain
xapi.qa.xfinity.com 2 2025-12-10 2026-03-06 ok
admin.qa.xfinity.com 3 2026-03-13 2026-09-15 nxdomain
platco.qa.xfinity.com 4 2025-07-29 2026-07-08 nxdomain
customer.qa.xfinity.com 4 2025-09-15 2026-08-17 ok
preview.customer.qa.xfinity.com 4 2025-09-15 2026-08-17 ok
es.qa.xfinity.com 2 2025-08-01 2025-12-10 nxdomain
services.qa.xfinity.com 2 2025-12-10 2026-03-06 ok
payments.qa.xfinity.com 4 2025-09-15 2026-08-17 ok
preview.payments.qa.xfinity.com 4 2025-09-15 2026-08-17 nxdomain
reports.qa.xfinity.com 1 2025-12-05 2025-12-05 nxdomain
common-payment.qa.xfinity.com 15 2025-11-25 2026-09-28 ok
content.qa.xfinity.com 4 2026-05-27 2026-08-27 ok
support.qa.xfinity.com 2 2026-01-27 2026-01-27 ok
www.qa.xfinity.com 2 2025-12-10 2026-03-06 ok
author.www.qa.xfinity.com 1 2026-08-27 2026-08-27 nxdomain
sdx.qa.xfinity.com 15 2025-07-22 2026-08-20 ok
oxadsqa.xfinity.com 2 2025-08-14 2026-09-25 nxdomain
www.oxadsqa.xfinity.com 2 2025-08-14 2026-09-25 nxdomain
xcp-ep-testinfra.xfinity.com 12 2025-09-03 2026-08-15 nodata
*.xcp-ep-testinfra.xfinity.com 12 2025-09-03 2026-08-15 —
*.ep-testinfra.xcp-ep-testinfra.xfinity.com 8 2025-09-03 2026-08-15 —
*.commerceep-testinfra.xcp-ep-testinfra.xfinity.com 12 2025-09-03 2026-08-15 —
*.centralep-testinfra.xcp-ep-testinfra.xfinity.com 12 2025-09-03 2026-08-15 —
connect-beta.xfinity.com 1 2026-07-25 2026-07-25 ok
speedtest-beta.xfinity.com 2 2025-09-01 2026-06-29 nxdomain
www.speedtest-beta.xfinity.com 2 2025-09-01 2026-06-29 nxdomain
secure.beta.xfinity.com 14 2025-07-22 2026-08-20 nxdomain
staging.beta.xfinity.com 14 2025-07-22 2026-08-20 nxdomain
iota.xfinity.com 1 2026-06-08 2026-06-08 ok
jaya.xfinity.com 1 2026-02-10 2026-02-10 nxdomain
celestial-uat-b.xfinity.com 5 2025-09-29 2026-08-17 ok
celestial-aem-uat-b.xfinity.com 3 2026-09-17 2026-09-28 nxdomain
xm360-payment-uat-b.xfinity.com 1 2026-02-02 2026-02-02 nodata
xma-cp-lab.xfinity.com 1 2025-11-07 2025-11-07 ok
qarespdir-ch2-i1t.slb.xfinity.com 2 2026-02-19 2026-09-29 ok
qarespdir-ho-i1t.slb.xfinity.com 2 2026-02-19 2026-09-29 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/xfinity.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/xfinity.com.