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.

10 hosts · 296 ms

HostCertsFirst seenLast seenDNS
textfree.com 15 2026-05-22 2026-10-05 ok
*.textfree.com 2 2026-08-24 2026-08-24 —
*.qa01.textfree.com 2 2026-06-26 2026-06-26 —
*.prod01.textfree.com 2 2026-09-24 2026-09-24 —
*.staging01.textfree.com 2 2026-06-26 2026-06-26 —
*.dev01.textfree.com 2 2026-06-25 2026-06-25 —
m.qa.textfree.com 6 2026-03-02 2026-08-18 nxdomain
m.stage.textfree.com 5 2026-03-02 2026-08-18 nxdomain
m.textfree.com 3 2026-03-02 2026-08-03 ok
www.textfree.com 11 2026-06-08 2026-10-05 ok

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