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.

16 hosts · 335 ms

HostCertsFirst seenLast seenDNS
nuubu.com 23 2026-05-02 2026-09-27 ok
*.nuubu.com 16 2026-05-02 2026-09-27 —
click.send.nuubu.com 6 2026-06-30 2026-08-28 ok
bounces.send.nuubu.com 4 2026-06-30 2026-08-28 ok
images.send.nuubu.com 10 2026-05-12 2026-09-07 ok
cdn.nuubu.com 8 2026-05-12 2026-09-07 ok
click.info.nuubu.com 6 2026-06-30 2026-08-28 ok
bounces.info.nuubu.com 6 2026-06-30 2026-08-28 ok
go.nuubu.com 5 2026-07-20 2026-09-17 ok
tracktor.nuubu.com 8 2026-05-12 2026-09-07 ok
links.nuubu.com 4 2026-06-06 2026-10-06 ok
itlinks.nuubu.com 10 2026-05-12 2026-09-07 ok
support.nuubu.com 8 2026-05-21 2026-09-16 ok
www.nuubu.com 8 2026-05-12 2026-09-07 ok
selector1-azurecomm-prod-net.domainkey.nuubu.com 2 2026-10-01 2026-10-01 nxdomain
amz.nuubu.com 3 2026-05-30 2026-08-03 ok

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