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.

24 hosts · 376 ms

HostCertsFirst seenLast seenDNS
wtcks.com 1 2026-01-12 2026-01-12 ok
*.wtcks.com 1 2026-01-12 2026-01-12 —
oa.wtcks.com 6 2025-08-06 2026-08-31 ok
oab.wtcks.com 6 2025-08-06 2026-08-31 ok
conference.wtcks.com 2 2025-08-08 2026-04-16 ok
www.conference.wtcks.com 1 2025-08-08 2025-08-08 nxdomain
myphone.wtcks.com 1 2026-01-16 2026-01-16 ok
www.myphone.wtcks.com 1 2026-01-16 2026-01-16 nxdomain
wtcmarketing.wtcks.com 11 2026-06-02 2026-09-28 ok
www.wtcmarketing.wtcks.com 13 2026-06-02 2026-09-28 ok
prtg.wtcks.com 3 2026-04-17 2026-07-14 ok
unifi.wtcks.com 5 2026-05-08 2026-09-05 ok
mail.wtcks.com 11 2025-08-06 2026-09-25 ok
email.wtcks.com 6 2025-08-06 2026-08-31 ok
www.email.wtcks.com 6 2025-08-06 2026-08-31 nxdomain
vm.wtcks.com 2 2026-06-03 2026-06-03 nxdomain
www.vm.wtcks.com 2 2026-06-03 2026-06-03 nxdomain
imap.wtcks.com 6 2025-08-06 2026-08-31 nxdomain
pop.wtcks.com 6 2025-08-06 2026-08-31 nxdomain
ipadapp.wtcks.com 5 2026-05-03 2026-09-01 ok
autodiscover.wtcks.com 6 2025-08-06 2026-08-31 ok
netops.wtcks.com 3 2026-06-30 2026-08-29 ok
ews.wtcks.com 6 2025-08-06 2026-08-31 ok
view.wtcks.com 8 2026-05-06 2026-09-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/wtcks.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/wtcks.com.