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.

34 hosts · 661 ms

HostCertsFirst seenLast seenDNS
modkat.com 13 2026-05-15 2026-09-25 ok
autoconfig.modkat.com 3 2026-07-02 2026-09-01 ok
staging.modkat.com 5 2026-05-02 2026-09-01 ok
www.staging.modkat.com 5 2026-05-02 2026-09-01 ok
excellencefamilies.org.modkat.com 5 2026-05-22 2026-09-21 ok
www.excellencefamilies.org.modkat.com 5 2026-05-22 2026-09-21 ok
webdisk.modkat.com 5 2026-05-03 2026-09-01 ok
cpanel.modkat.com 5 2026-05-03 2026-09-01 ok
webmail.modkat.com 5 2026-05-03 2026-09-01 ok
email.modkat.com 7 2025-08-09 2026-08-13 ok
www.email.modkat.com 7 2025-08-09 2026-08-13 nxdomain
modko.ca.com.modkat.com 4 2026-04-10 2026-08-10 ok
www.modko.ca.com.modkat.com 4 2026-04-10 2026-08-10 ok
modadog.com.modkat.com 5 2026-04-28 2026-08-28 ok
www.modadog.com.modkat.com 5 2026-04-28 2026-08-28 ok
modko.uk.com.modkat.com 5 2026-06-02 2026-10-02 ok
www.modko.uk.com.modkat.com 5 2026-06-02 2026-10-02 ok
fultonstreetdesign.com.modkat.com 5 2026-05-02 2026-09-01 ok
www.fultonstreetdesign.com.modkat.com 5 2026-05-02 2026-09-01 ok
modko.com.modkat.com 5 2026-05-24 2026-09-23 ok
www.modko.com.modkat.com 5 2026-05-24 2026-09-23 ok
modkatlitterbox.com.modkat.com 5 2026-05-28 2026-09-27 ok
www.modkatlitterbox.com.modkat.com 5 2026-05-28 2026-09-27 ok
moddogpotty.com.modkat.com 4 2026-04-20 2026-08-20 ok
www.moddogpotty.com.modkat.com 4 2026-04-20 2026-08-20 ok
help.modkat.com 5 2026-04-25 2026-08-27 ok
server.modkat.com 5 2026-05-04 2026-09-01 ok
links.modkat.com 5 2026-04-22 2026-09-16 ok
sms.modkat.com 5 2026-04-29 2026-09-27 ok
returns.modkat.com 6 2026-05-15 2026-09-11 ok
cpcalendars.modkat.com 5 2026-05-03 2026-09-01 ok
cpcontacts.modkat.com 5 2026-05-03 2026-09-01 ok
account.modkat.com 17 2026-04-14 2026-09-26 ok
www.modkat.com 13 2026-05-10 2026-09-20 ok

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