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
gmosign.com 5 2025-07-11 2026-07-15 ok
*.gmosign.com 9 2025-07-11 2026-08-30 —
cvtk30.gmosign.com 1 2025-12-27 2025-12-27 ok
secure.gmosign.com 3 2025-09-19 2026-10-01 ok
clm.gmosign.com 1 2025-11-20 2025-11-20 ok
*.clm.gmosign.com 1 2025-11-20 2025-11-20 —
bcp.clm.gmosign.com 1 2026-02-09 2026-02-09 nxdomain
stspg-info.gmosign.com 5 2026-05-17 2026-09-13 ok
go.gmosign.com 9 2026-04-19 2026-09-15 ok
app.gmosign.com 1 2026-04-30 2026-04-30 ok
www.gmosign.com 1 2025-10-22 2025-10-22 ok

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