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.

10 hosts · 237 ms

HostCertsFirst seenLast seen
pendant.io 2 2026-03-05 2026-07-21
staging.pendant.io 2 2025-06-18 2026-05-19
aws.staging.pendant.io 2 2025-06-18 2026-05-19
marketing.pendant.io 17 2026-05-04 2026-10-07
link.pendant.io 5 2026-04-28 2026-08-26
go.pendant.io 12 2026-05-04 2026-10-01
app.pendant.io 2 2026-03-05 2026-07-21
assets.pendant.io 2 2026-04-15 2026-09-15
development.assets.pendant.io 2 2026-04-15 2026-09-15
get.pendant.io 18 2026-05-08 2026-09-03

Programmatic access: API GET /v1/hosts/pendant.io (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/pendant.io.