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.

17 hosts · 268 ms

HostCertsFirst seenLast seenDNS
claim.md 5 2025-12-08 2026-09-04 ok
*.claim.md 2 2026-02-11 2026-02-15 —
code2.claim.md 1 2025-11-09 2025-11-09 ok
web.claim.md 1 2026-01-25 2026-01-25 nxdomain
svc.claim.md 1 2026-01-25 2026-01-25 ok
code.claim.md 3 2025-08-04 2026-07-05 ok
*.code.claim.md 3 2025-08-04 2026-07-05 —
api.claim.md 5 2026-05-04 2026-09-03 ok
signin.claim.md 1 2026-02-09 2026-02-09 ok
app.claim.md 1 2026-01-25 2026-01-25 ok
docs.claim.md 8 2026-05-01 2026-08-27 ok
status.claim.md 5 2026-05-15 2026-09-11 ok
test.claim.md 3 2025-07-09 2026-06-09 nxdomain
dev.claim.md 3 2025-09-05 2026-09-20 ok
new.claim.md 3 2025-10-28 2026-09-28 nxdomain
www.claim.md 1 2025-12-08 2025-12-08 ok
pay.claim.md 12 2026-05-20 2026-09-16 ok

Programmatic access, with DNS A records: API GET /v1/hosts/claim.md (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/claim.md.