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.

6 hosts · 297 ms

HostCertsFirst seenLast seenDNS
allegro.cz 2 2025-09-16 2026-09-09 ok
*.allegro.cz 2 2025-09-16 2026-09-09 —
business.allegro.cz 1 2026-05-19 2026-05-19 ok
*.business.allegro.cz 1 2026-05-19 2026-05-19 —
upload.business.allegro.cz 1 2025-11-12 2025-11-12 ok
edge.business.allegro.cz 1 2025-11-12 2025-11-12 ok

Programmatic access, with DNS A records: API GET /v1/hosts/allegro.cz (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/allegro.cz.