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.

28 hosts · 219 ms

HostCertsFirst seenLast seen
aktio.co.jp 10 2026-03-23 2026-09-10
*.aktio.co.jp 9 2026-03-23 2026-09-10
em1.aktio.co.jp 20 2026-06-08 2026-10-04
lp1.aktio.co.jp 16 2026-04-11 2026-09-28
stage.aktio.co.jp 5 2026-06-01 2026-10-01
magazine.aktio.co.jp 2 2026-01-15 2026-01-15
stage-magazine.aktio.co.jp 5 2026-06-01 2026-10-01
note.aktio.co.jp 2 2026-01-15 2026-01-15
stage-note.aktio.co.jp 6 2026-06-01 2026-10-01
repairquote.aktio.co.jp 2 2025-08-20 2026-07-21
stage.eg.aktio.co.jp 6 2026-06-01 2026-10-01
www.eg.aktio.co.jp 2 2025-10-16 2025-10-16
kai.aktio.co.jp 5 2026-01-06 2026-08-15
stage.kai.aktio.co.jp 7 2026-06-01 2026-10-01
www.kai.aktio.co.jp 5 2026-01-06 2026-08-15
shinyukai.aktio.co.jp 4 2025-06-23 2026-09-15
stage.shinyukai.aktio.co.jp 5 2026-06-01 2026-10-01
seisankanri.aktio.co.jp 2 2026-04-08 2026-09-03
em.aktio.co.jp 10 2026-06-07 2026-10-03
info.aktio.co.jp 1 2026-07-08 2026-07-08
lp.aktio.co.jp 14 2026-06-08 2026-09-28
brandshop.aktio.co.jp 17 2026-04-12 2026-09-26
order.aktio.co.jp 5 2026-05-19 2026-09-16
repairquote-test.aktio.co.jp 2 2025-06-25 2026-05-26
seisankanri-test.aktio.co.jp 2 2026-04-08 2026-09-03
orderassist-test.aktio.co.jp 2 2025-08-18 2026-07-19
orderassist.aktio.co.jp 2 2025-08-18 2026-07-19
www.aktio.co.jp 1 2026-05-13 2026-05-13

Programmatic access: API GET /v1/hosts/aktio.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/aktio.co.jp.