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.

16 hosts · 209 ms

HostCertsFirst seenLast seen
najell.com 23 2026-04-24 2026-10-06
*.najell.com 18 2026-04-26 2026-10-06
media.najell.com 2 2026-02-24 2026-07-12
traffic.data.najell.com 3 2026-06-10 2026-08-11
pipeline.data.najell.com 3 2026-06-12 2026-08-14
config.data.najell.com 3 2026-06-10 2026-08-12
ads.data.najell.com 3 2026-06-10 2026-08-11
orders.data.najell.com 3 2026-06-10 2026-08-11
contracts.data.najell.com 3 2026-07-15 2026-09-14
work.najell.com 10 2026-04-15 2026-09-24
dam.najell.com 1 2026-09-08 2026-09-08
gtm.najell.com 5 2026-05-16 2026-09-26
cdn.najell.com 2 2026-09-07 2026-09-07
return.najell.com 4 2026-05-02 2026-07-01
reclaimit.najell.com 15 2026-04-28 2026-10-02
www.najell.com 5 2026-04-24 2026-08-27

Programmatic access: API GET /v1/hosts/najell.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/najell.com.