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.

13 hosts · 291 ms

HostCertsFirst seenLast seenDNS
mysticlake.com 8 2026-05-25 2026-09-14 ok
*.mysticlake.com 9 2026-05-25 2026-09-14 —
data.i.mysticlake.com 5 2026-04-04 2026-09-20 ok
cdn.i.mysticlake.com 1 2026-01-05 2026-01-05 ok
data.m.mysticlake.com 5 2026-04-04 2026-09-20 ok
cdn.m.mysticlake.com 1 2026-01-05 2026-01-05 ok
links1.em.mysticlake.com 4 2026-04-20 2026-08-18 ok
links.em.mysticlake.com 2 2026-02-18 2026-06-30 ok
go.mysticlake.com 10 2026-05-06 2026-09-01 ok
qr.mysticlake.com 10 2026-05-21 2026-09-16 ok
images.mysticlake.com 6 2026-06-03 2026-10-01 ok
mta-sts.mysticlake.com 2 2026-06-10 2026-08-21 ok
delivery.mysticlake.com 8 2026-05-06 2026-09-01 ok

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