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.

4 hosts · 216 ms

HostCertsFirst seenLast seen
allegropay.pl 1 2026-06-15 2026-06-15
*.allegropay.pl 1 2026-06-15 2026-06-15
3dsecure.allegropay.pl 2 2025-08-06 2026-07-08
www.3dsecure.allegropay.pl 2 2025-08-06 2026-07-08

Programmatic access: API GET /v1/hosts/allegropay.pl (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/allegropay.pl.