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.

60 hosts · 428 ms

HostCertsFirst seenLast seenDNS
24hourfitness.com 8 2025-09-10 2026-09-17 ok
*.24hourfitness.com 3 2025-09-10 2026-09-10 —
author-prod.24hourfitness.com 1 2026-02-11 2026-02-11 ok
www.author-prod.24hourfitness.com 1 2026-02-11 2026-02-11 nxdomain
stage.24hourfitness.com 1 2026-02-11 2026-02-11 ok
author-stage.24hourfitness.com 1 2026-02-11 2026-02-11 ok
webprd-origin.24hourfitness.com 5 2026-03-24 2026-09-17 ok
shop.24hourfitness.com 15 2026-04-17 2026-09-28 ok
res2.member.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t2.member.24hourfitness.com 1 2025-12-11 2025-12-11 ok
m3.member.24hourfitness.com 1 2025-12-11 2025-12-11 ok
res3.member.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t3.member.24hourfitness.com 1 2025-12-11 2025-12-11 ok
web.member.24hourfitness.com 1 2025-12-11 2025-12-11 ok
m.member.24hourfitness.com 3 2025-08-01 2025-12-11 ok
res.member.24hourfitness.com 3 2025-07-31 2025-12-11 ok
t.member.24hourfitness.com 3 2025-08-01 2025-12-11 ok
m1.customer.24hourfitness.com 3 2025-08-01 2025-12-11 ok
res1.customer.24hourfitness.com 3 2025-07-31 2025-12-11 ok
t1.customer.24hourfitness.com 3 2025-08-01 2025-12-11 ok
res2.customer.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t2.customer.24hourfitness.com 1 2025-12-11 2025-12-11 ok
m3.customer.24hourfitness.com 1 2025-12-11 2025-12-11 ok
res3.customer.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t3.customer.24hourfitness.com 1 2025-12-11 2025-12-11 ok
web.customer.24hourfitness.com 1 2025-12-11 2025-12-11 ok
jobs.24hourfitness.com 5 2026-05-09 2026-09-12 ok
veteranjobs.24hourfitness.com 5 2026-05-09 2026-09-12 ok
smetrics.24hourfitness.com 2 2026-02-03 2026-02-03 ok
rewards.24hourfitness.com 3 2025-06-21 2025-12-19 ok
fitperks.24hourfitness.com 3 2025-08-21 2026-08-22 ok
www.fitperks.24hourfitness.com 3 2025-08-21 2026-08-22 nxdomain
careers.24hourfitness.com 5 2026-04-25 2026-08-29 ok
www.careers.24hourfitness.com 5 2026-05-09 2026-09-12 ok
hiringevents.24hourfitness.com 15 2026-06-06 2026-09-22 ok
paymentwidget.24hourfitness.com 1 2026-04-20 2026-04-20 ok
www.paymentwidget.24hourfitness.com 1 2026-04-20 2026-04-20 nxdomain
m1.account.24hourfitness.com 2 2025-10-27 2025-12-11 ok
res1.account.24hourfitness.com 2 2025-10-27 2025-12-11 ok
t1.account.24hourfitness.com 2 2025-10-27 2025-12-11 ok
res2.account.24hourfitness.com 1 2025-12-11 2025-12-11 nxdomain
t2.account.24hourfitness.com 1 2025-12-11 2025-12-11 nxdomain
m4.account.24hourfitness.com 1 2025-12-11 2025-12-11 ok
res4.account.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t4.account.24hourfitness.com 1 2025-12-11 2025-12-11 ok
m5.account.24hourfitness.com 1 2025-12-11 2025-12-11 ok
res5.account.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t5.account.24hourfitness.com 1 2025-12-11 2025-12-11 ok
web.account.24hourfitness.com 1 2025-12-11 2025-12-11 nxdomain
res2.guest.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t2.guest.24hourfitness.com 1 2025-12-11 2025-12-11 ok
m3.guest.24hourfitness.com 1 2025-12-11 2025-12-11 ok
res3.guest.24hourfitness.com 1 2025-12-11 2025-12-11 ok
t3.guest.24hourfitness.com 1 2025-12-11 2025-12-11 ok
web.guest.24hourfitness.com 1 2025-12-11 2025-12-11 ok
m.guest.24hourfitness.com 3 2025-08-01 2025-12-11 ok
res.guest.24hourfitness.com 3 2025-07-31 2025-12-11 ok
t.guest.24hourfitness.com 3 2025-08-01 2025-12-11 ok
author-dev.24hourfitness.com 1 2026-02-11 2026-02-11 ok
www.24hourfitness.com 5 2026-03-24 2026-09-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/24hourfitness.com (API key for paging).

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/24hourfitness.com.