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.

27 hosts · 293 ms

HostCertsFirst seenLast seenDNS
ustsubaki.com 11 2026-01-06 2026-08-30 ok
*.ustsubaki.com 1 2026-01-06 2026-01-06 —
herald.ustsubaki.com 2 2025-06-25 2026-06-26 ok
www.herald.ustsubaki.com 2 2025-06-25 2026-06-26 nxdomain
interchange.ustsubaki.com 1 2025-06-12 2025-06-12 ok
www.interchange.ustsubaki.com 1 2025-06-12 2025-06-12 nxdomain
catalog.ustsubaki.com 5 2026-05-13 2026-09-17 ok
portal.ustsubaki.com 3 2026-05-03 2026-08-19 ok
whl.ustsubaki.com 5 2026-04-30 2026-08-28 ok
evm.ustsubaki.com 3 2025-09-14 2026-09-15 ok
www.evm.ustsubaki.com 3 2025-09-14 2026-09-15 nxdomain
info.ustsubaki.com 10 2026-04-22 2026-08-18 ok
whisper.ustsubaki.com 2 2025-06-25 2026-06-26 ok
www.whisper.ustsubaki.com 2 2025-06-25 2026-06-26 nxdomain
chains.ustsubaki.com 8 2026-05-18 2026-09-28 ok
carriers.ustsubaki.com 4 2026-04-21 2026-08-19 ok
whl-agiloft.ustsubaki.com 1 2025-11-09 2025-11-09 nxdomain
www.whl-agiloft.ustsubaki.com 1 2025-11-09 2025-11-09 nxdomain
cority.test.ustsubaki.com 3 2025-08-06 2026-08-07 nxdomain
www.cority.test.ustsubaki.com 3 2025-08-06 2026-08-07 nxdomain
ust.ustsubaki.com 1 2026-03-12 2026-03-12 nodata
*.ust.ustsubaki.com 1 2026-03-12 2026-03-12 —
whl-trubox.ust.ustsubaki.com 2 2025-06-28 2026-06-27 nxdomain
www.whl-trubox.ust.ustsubaki.com 2 2025-06-28 2026-06-27 nxdomain
chp-cority.ust.ustsubaki.com 1 2026-06-18 2026-06-18 nxdomain
www.chp-cority.ust.ustsubaki.com 1 2026-06-18 2026-06-18 nxdomain
www.ustsubaki.com 14 2026-04-28 2026-08-24 ok

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