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.

5 hosts · 343 ms

HostCertsFirst seenLast seenDNS
nercon.com 22 2025-12-16 2026-10-01 ok
*.nercon.com 13 2025-12-16 2026-09-21 —
sup-eml-01.nercon.com 3 2026-06-15 2026-08-14 ok
bimi.nercon.com 6 2026-08-03 2026-10-01 ok
*.bimi.nercon.com 6 2026-08-03 2026-10-01 —

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