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.

8 hosts · 253 ms

HostCertsFirst seenLast seenDNS
*.fldfs.com 1 2026-04-13 2026-04-13 —
EXT.fldfs.com 1 2025-10-13 2025-10-13 —
oauthprod.fldfs.com 1 2025-12-04 2025-12-04 nxdomain
zixvpm.fldfs.com 2 2025-09-30 2025-10-05 nodata
ecap.fldfs.com 4 2026-04-16 2026-08-26 ok
icap.fldfs.com 18 2026-05-24 2026-09-19 ok
icaptest.fldfs.com 5 2026-05-15 2026-09-24 ok
oauthdev.fldfs.com 1 2025-11-25 2025-11-25 nxdomain

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