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.

22 hosts · 350 ms

HostCertsFirst seenLast seenDNS
curity.io 13 2026-04-17 2026-08-31 ok
*.curity.io 12 2026-05-04 2026-08-31 —
workshop1.curity.io 1 2026-05-23 2026-05-23 nxdomain
workshop2.curity.io 1 2026-05-23 2026-05-23 nxdomain
ch.curity.io 1 2026-04-17 2026-04-17 ok
releaseapi.curity.io 1 2026-04-17 2026-04-17 ok
licenseapi.curity.io 1 2026-04-17 2026-04-17 ok
signal.curity.io 2 2026-04-24 2026-04-24 ok
load.signal.curity.io 2 2026-04-24 2026-04-24 ok
login.curity.io 1 2026-04-17 2026-04-17 ok
workshop1-admin.curity.io 1 2026-05-23 2026-05-23 nxdomain
workshop2-admin.curity.io 1 2026-05-23 2026-05-23 nxdomain
login-demo.curity.io 1 2026-04-17 2026-04-17 ok
workshop.curity.io 1 2026-05-23 2026-05-23 ok
ftp.curity.io 1 2026-05-23 2026-05-23 ok
developer.curity.io 1 2026-04-17 2026-04-17 ok
docs.curity.io 1 2026-04-17 2026-04-17 ok
mta-sts.curity.io 3 2026-04-24 2026-09-13 ok
status.curity.io 5 2026-06-01 2026-09-29 ok
support.curity.io 1 2026-04-17 2026-04-17 ok
trust.curity.io 2 2026-03-03 2026-07-19 ok
www.curity.io 1 2026-04-17 2026-04-17 ok

Programmatic access, with DNS A records: API GET /v1/hosts/curity.io (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/curity.io.