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) · 331 ms

HostCertsFirst seenLast seenDNS
cloudflare.com 24 2026-05-10 2026-09-18 ok
*.cloudflare.com 14 2026-05-23 2026-09-18 —
cp10.cloudflare.com 9 2025-08-30 2026-10-02 ok
*.cp10.cloudflare.com 8 2026-05-16 2026-10-02 —
cp11.cloudflare.com 11 2026-04-18 2026-09-27 ok
*.cp11.cloudflare.com 11 2026-04-18 2026-09-27 —
x402.cloudflare.com 12 2026-05-13 2026-09-08 ok
*.x402.cloudflare.com 12 2026-05-13 2026-09-08 —
playground.x402.cloudflare.com 22 2026-05-14 2026-09-30 ok
*.playground.x402.cloudflare.com 16 2026-05-14 2026-09-30 —
cp12.cloudflare.com 7 2026-02-27 2026-08-15 ok
*.cp12.cloudflare.com 6 2026-04-19 2026-08-15 —
staging.cp12.cloudflare.com 1 2026-02-27 2026-02-27 ok
data.em2.cloudflare.com 4 2025-06-27 2025-06-27 ok
cdn.em2.cloudflare.com 3 2026-05-03 2026-10-03 ok
cp2.cloudflare.com 19 2025-06-30 2026-09-25 ok
*.cp2.cloudflare.com 16 2026-05-08 2026-09-25 —
cp13.cloudflare.com 2 2026-09-18 2026-09-20 nodata
*.cp13.cloudflare.com 2 2026-09-18 2026-09-20 —
cp3.cloudflare.com 9 2025-06-30 2026-09-05 ok
*.cp3.cloudflare.com 7 2026-04-18 2026-09-05 —
cp4.cloudflare.com 17 2025-06-30 2026-09-14 ok
*.cp4.cloudflare.com 15 2026-04-13 2026-09-14 —
cp5.cloudflare.com 10 2025-06-30 2026-09-04 ok
*.cp5.cloudflare.com 7 2026-05-09 2026-09-04 —
cp6.cloudflare.com 11 2025-06-30 2026-09-30 ok
*.cp6.cloudflare.com 9 2026-05-08 2026-09-30 —
cp7.cloudflare.com 11 2026-04-21 2026-09-14 ok
*.cp7.cloudflare.com 11 2026-04-21 2026-09-14 —
cp8.cloudflare.com 7 2026-05-17 2026-09-29 ok
*.cp8.cloudflare.com 7 2026-05-17 2026-09-29 —
cp9.cloudflare.com 12 2025-12-09 2026-10-05 ok
*.cp9.cloudflare.com 11 2026-05-09 2026-10-05 —
cac.cloudflare.com 26 2026-04-22 2026-10-05 nodata
*.cac.cloudflare.com 18 2026-06-01 2026-10-05 —
staging.cac.cloudflare.com 43 2026-04-18 2026-09-30 nodata
*.staging.cac.cloudflare.com 22 2026-04-18 2026-09-27 —
downloads.staging.cac.cloudflare.com 5 2026-09-30 2026-09-30 ok
*.downloads.staging.cac.cloudflare.com 3 2026-09-30 2026-09-30 —
maps.staging.cac.cloudflare.com 11 2026-06-01 2026-09-27 ok
ui-maps.staging.cac.cloudflare.com 18 2026-05-14 2026-09-16 ok
*.ui-maps.staging.cac.cloudflare.com 8 2026-05-21 2026-09-16 —
maps.cac.cloudflare.com 9 2026-06-01 2026-09-28 ok
ui-maps.cac.cloudflare.com 8 2026-04-22 2026-08-18 ok
*.ui-maps.cac.cloudflare.com 8 2026-04-22 2026-08-18 —
ced.cloudflare.com 14 2026-05-06 2026-09-01 nodata
*.ced.cloudflare.com 14 2026-05-06 2026-09-01 —
middlecache.ced.cloudflare.com 10 2026-05-06 2026-09-01 ok
speed.cloudflare.com 88 2026-04-17 2026-09-16 ok
*.speed.cloudflare.com 88 2026-04-17 2026-09-16 —
c10.speed.cloudflare.com 6 2026-04-28 2026-08-24 nxdomain
custom-t0.speed.cloudflare.com 13 2026-04-18 2026-09-28 ok
*.custom-t0.speed.cloudflare.com 13 2026-04-18 2026-09-28 —
c1.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
custom-t1.speed.cloudflare.com 12 2026-04-15 2026-08-15 ok
*.custom-t1.speed.cloudflare.com 12 2026-04-15 2026-08-15 —
c2.speed.cloudflare.com 6 2026-04-28 2026-08-24 nxdomain
custom-t2.speed.cloudflare.com 12 2026-04-15 2026-09-10 ok
*.custom-t2.speed.cloudflare.com 12 2026-04-15 2026-09-10 —
c3.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
h3.speed.cloudflare.com 18 2026-05-12 2026-09-30 ok
*.h3.speed.cloudflare.com 18 2026-05-12 2026-09-30 —
custom-inside-tunnel.h3.speed.cloudflare.com 18 2026-04-14 2026-09-14 ok
*.custom-inside-tunnel.h3.speed.cloudflare.com 18 2026-04-14 2026-09-14 —
custom-outside-tunnel.h3.speed.cloudflare.com 15 2026-04-14 2026-09-01 ok
*.custom-outside-tunnel.h3.speed.cloudflare.com 15 2026-04-14 2026-09-01 —
bastion.h3.speed.cloudflare.com 17 2026-05-04 2026-09-23 ok
*.bastion.h3.speed.cloudflare.com 17 2026-05-04 2026-09-23 —
custom-t3.speed.cloudflare.com 19 2026-04-15 2026-09-25 ok
*.custom-t3.speed.cloudflare.com 19 2026-04-15 2026-09-25 —
c4.speed.cloudflare.com 6 2026-04-28 2026-08-24 nxdomain
custom-t4.speed.cloudflare.com 18 2026-04-15 2026-09-17 ok
*.custom-t4.speed.cloudflare.com 18 2026-04-15 2026-09-17 —
c5.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
c6.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
c7.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
c8.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
c9.speed.cloudflare.com 8 2026-04-28 2026-08-24 nxdomain
staging.speed.cloudflare.com 61 2026-04-30 2026-09-22 ok
*.staging.speed.cloudflare.com 23 2026-04-30 2026-09-22 —
t0.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 ok
*.t0.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 —
t1.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 ok
*.t1.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 —
t2.staging.speed.cloudflare.com 7 2026-08-13 2026-09-18 ok
*.t2.staging.speed.cloudflare.com 7 2026-08-13 2026-09-18 —
h3.staging.speed.cloudflare.com 79 2026-05-09 2026-10-02 ok
*.h3.staging.speed.cloudflare.com 22 2026-05-27 2026-10-02 —
experiment-cca-0.h3.staging.speed.cloudflare.com 6 2026-07-22 2026-09-18 ok
*.experiment-cca-0.h3.staging.speed.cloudflare.com 6 2026-07-22 2026-09-18 —
t0.h3.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 ok
*.t0.h3.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 —
experiment-cca-1.h3.staging.speed.cloudflare.com 6 2026-07-22 2026-09-18 ok
*.experiment-cca-1.h3.staging.speed.cloudflare.com 6 2026-07-22 2026-09-18 —
t1.h3.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 ok
*.t1.h3.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 —
t2.h3.staging.speed.cloudflare.com 7 2026-08-13 2026-09-18 ok
*.t2.h3.staging.speed.cloudflare.com 7 2026-08-13 2026-09-18 —
t3.h3.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 ok
*.t3.h3.staging.speed.cloudflare.com 6 2026-08-13 2026-09-18 —

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/cloudflare.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/cloudflare.com.