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.

24 hosts · 318 ms

HostCertsFirst seenLast seenDNS
nbb.com 6 2025-12-08 2026-09-28 ok
*.nbb.com 8 2025-10-02 2026-09-28 —
cdn01.nbb.com 4 2026-04-07 2026-08-24 ok
sharecloud.nbb.com 1 2026-01-19 2026-01-19 ok
nextcloud.nbb.com 5 2025-07-30 2026-07-29 ok
service.nbb.com 4 2026-04-07 2026-08-24 ok
blog.nbb.com 4 2026-04-07 2026-08-24 ok
edi.nbb.com 2 2026-05-13 2026-05-13 ok
jitsi.nbb.com 2 2025-07-30 2026-07-29 ok
feedback.nbb.com 4 2026-06-04 2026-10-02 ok
mail.nbb.com 1 2025-12-05 2025-12-05 ok
nl.nbb.com 4 2026-04-07 2026-08-24 ok
link-nl.nbb.com 13 2026-04-29 2026-09-16 ok
pl.nbb.com 4 2026-04-07 2026-08-24 ok
tmm.nbb.com 4 2026-04-07 2026-08-24 ok
jitsi-stun.nbb.com 2 2025-07-30 2026-07-29 ok
smtp.nbb.com 1 2025-12-05 2025-12-05 ok
autodiscover.nbb.com 1 2025-12-05 2025-12-05 ok
es.nbb.com 4 2026-04-07 2026-08-24 ok
business.nbb.com 4 2026-04-07 2026-08-24 ok
news.nbb.com 1 2026-06-09 2026-06-09 ok
status-dev.nbb.com 2 2026-07-23 2026-09-14 ok
edidev.nbb.com 1 2026-05-13 2026-05-13 ok
www.nbb.com 4 2026-04-07 2026-08-24 ok

Programmatic access, with DNS A records: API GET /v1/hosts/nbb.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/nbb.com.