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.

7 hosts · 303 ms

HostCertsFirst seenLast seenDNS
markslojd.com 34 2025-11-06 2026-10-05 ok
*.markslojd.com 27 2025-11-06 2026-10-05 —
bimi.markslojd.com 7 2026-08-07 2026-10-05 ok
pin.markslojd.com 5 2026-05-24 2026-09-21 ok
return.markslojd.com 13 2026-05-22 2026-10-02 ok
lp.markslojd.com 5 2026-05-01 2026-08-31 ok
www.markslojd.com 4 2026-06-07 2026-10-04 ok

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