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.

17 hosts · 285 ms

HostCertsFirst seenLast seenDNS
zeiierman.com 48 2026-04-13 2026-10-01 ok
*.zeiierman.com 32 2026-04-22 2026-10-01 —
d.zeiierman.com 5 2026-05-14 2026-09-11 ok
wf.zeiierman.com 4 2026-09-24 2026-09-24 ok
capig.zeiierman.com 10 2026-05-15 2026-09-10 ok
blog.zeiierman.com 10 2026-04-23 2026-08-19 ok
api.zeiierman.com 6 2026-04-22 2026-08-18 ok
deprecated-api.zeiierman.com 11 2026-05-26 2026-09-22 ok
application.zeiierman.com 4 2026-04-15 2026-08-17 ok
video.zeiierman.com 1 2026-09-09 2026-09-09 ok
app.zeiierman.com 12 2026-05-19 2026-09-14 ok
docs.zeiierman.com 17 2026-05-15 2026-09-23 ok
suggestions.zeiierman.com 5 2026-04-29 2026-08-31 ok
alerts.zeiierman.com 13 2026-04-15 2026-08-20 ok
mta-sts.zeiierman.com 10 2026-04-28 2026-08-25 ok
www.zeiierman.com 15 2026-04-14 2026-09-24 ok
swipex.zeiierman.com 5 2026-04-27 2026-08-28 ok

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