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.

21 hosts · 171 ms

HostCertsFirst seenLast seen
t-gaia.co.jp 3 2025-09-18 2026-10-02
gw01.t-gaia.co.jp 1 2026-01-08 2026-01-08
test0703.t-gaia.co.jp 1 2025-07-03 2025-07-03
marketing.t-gaia.co.jp 9 2026-04-13 2026-09-10
edi.t-gaia.co.jp 2 2025-08-28 2026-07-28
*.edi.t-gaia.co.jp 2 2025-08-28 2026-07-28
tskynet.demo.t-gaia.co.jp 1 2025-12-03 2025-12-03
gift-order.t-gaia.co.jp 1 2025-10-20 2025-10-20
www.tgs.t-gaia.co.jp 1 2025-12-31 2025-12-31
agileworks.t-gaia.co.jp 2 2025-08-25 2026-07-26
mocos.t-gaia.co.jp 1 2026-01-23 2026-01-23
mta-sts.t-gaia.co.jp 3 2026-04-29 2026-09-18
mocos-uat.t-gaia.co.jp 1 2026-01-23 2026-01-23
tskynet.t-gaia.co.jp 2 2025-08-25 2026-09-10
www.sl-ai-bot.t-gaia.co.jp 3 2026-05-18 2026-09-06
agileworks-test.t-gaia.co.jp 2 2025-09-18 2026-08-19
mocos-test.t-gaia.co.jp 1 2026-01-23 2026-01-23
a8cv.t-gaia.co.jp 7 2026-05-18 2026-09-14
mocos-dev.t-gaia.co.jp 1 2026-01-23 2026-01-23
www.t-gaia.co.jp 3 2025-09-18 2026-10-02
stg-www.t-gaia.co.jp 2 2026-03-06 2026-07-22

Programmatic access: API GET /v1/hosts/t-gaia.co.jp (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/t-gaia.co.jp.