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.

9 hosts · 273 ms

HostCertsFirst seenLast seenDNS
bci.nc 5 2025-09-17 2026-08-27 ok
*.bci.nc 2 2025-09-17 2026-08-27 —
emailing.bci.nc 7 2026-04-15 2026-09-30 ok
eye.emailing.bci.nc 7 2026-04-15 2026-09-30 ok
img.emailing.bci.nc 7 2026-04-15 2026-09-30 ok
click.emailing.bci.nc 6 2026-05-07 2026-09-04 ok
landings.emailing.bci.nc 7 2026-04-15 2026-09-30 ok
forms.emailing.bci.nc 7 2026-04-15 2026-09-30 ok
www.bci.nc 3 2026-02-09 2026-07-07 ok

Programmatic access, with DNS A records: API GET /v1/hosts/bci.nc (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/bci.nc.