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.

4 hosts · 226 ms

HostCertsFirst seenLast seenDNS
cloud.reply.forthepeople.com 3 2025-09-04 2026-08-22 ok
image.reply.forthepeople.com 3 2025-12-08 2026-09-06 ok
click.reply.forthepeople.com 3 2025-09-04 2026-08-24 ok
view.reply.forthepeople.com 3 2025-09-04 2026-08-25 ok

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