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.

3 hosts · 267 ms

HostCertsFirst seenLast seenDNS
image.commercialemails.amcplc.com 1 2026-02-12 2026-02-12 ok
link.commercialemails.amcplc.com 1 2026-02-11 2026-02-11 ok
links.commercialemails.amcplc.com 2 2025-09-29 2025-10-07 ok

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