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.

11 hosts · 335 ms

HostCertsFirst seenLast seenDNS
kewlioo.com 17 2026-05-15 2026-09-24 ok
*.kewlioo.com 2 2026-08-27 2026-08-29 —
gzjnc.kewlioo.com 10 2026-04-25 2026-08-21 ok
trk.send.kewlioo.com 6 2026-04-24 2026-08-20 ok
go.kewlioo.com 2 2026-10-03 2026-10-03 ok
help.kewlioo.com 6 2026-05-07 2026-07-05 ok
os.kewlioo.com 3 2026-07-24 2026-09-22 ok
get.kewlioo.com 4 2026-05-24 2026-07-25 ok
account.kewlioo.com 12 2026-04-11 2026-09-25 ok
www.kewlioo.com 15 2026-05-16 2026-09-24 ok
try.kewlioo.com 4 2026-05-23 2026-07-22 ok

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