Find every subdomain
of a domain.

Every hostname under a domain that ever appeared in a public TLS certificate — with certificate counts and first/last seen dates.

8 hosts · 296 ms

Download CSV
HostCertsFirst seenLast seen
peerly.com 26 2025-10-19 2026-10-15
*.peerly.com 26 2025-10-19 2026-10-15
tracking.peerly.com 4 2026-05-02 2026-10-10
book.peerly.com 3 2026-05-07 2026-08-24
app.peerly.com 3 2026-05-24 2026-09-11
r.peerly.com 5 2026-04-27 2026-08-25
api-docs.peerly.com 8 2026-05-06 2026-09-01
tracking-dev.peerly.com 3 2026-05-11 2026-08-26

Programmatic access: API GET /v1/hosts/peerly.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/peerly.com.