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 · 247 ms

HostCertsFirst seenLast seen
norma-online.de 8 2025-11-06 2026-09-15
*.norma-online.de 7 2025-11-06 2026-09-15
karriere.norma-online.de 2 2026-05-11 2026-05-11
erechnung.norma-online.de 3 2026-07-14 2026-09-11
ftapi.norma-online.de 5 2026-05-18 2026-09-15
trck.norma-online.de 4 2026-04-19 2026-08-17
app.norma-online.de 2 2026-05-11 2026-05-11
www.norma-online.de 2 2026-05-11 2026-05-11

Programmatic access: API GET /v1/hosts/norma-online.de (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/norma-online.de.