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.

22 hosts · 275 ms

HostCertsFirst seenLast seen
acom.co.jp 2 2025-08-22 2026-08-19
mail01.acom.co.jp 1 2026-04-24 2026-04-24
www-test1.acom.co.jp 1 2025-10-09 2025-10-09
mail02.acom.co.jp 1 2026-04-24 2026-04-24
la2.patio2.acom.co.jp 1 2025-10-23 2025-10-23
la.patio2.acom.co.jp 1 2025-10-23 2025-10-23
va010001n1163.acom.co.jp 2 2026-01-16 2026-01-16
v010001n1163.acom.co.jp 4 2026-04-21 2026-10-07
la2.patio3.acom.co.jp 1 2025-09-26 2025-09-26
la.patio3.acom.co.jp 1 2025-09-26 2025-09-26
v010001n1164.acom.co.jp 2 2026-04-21 2026-10-07
v010001n1165.acom.co.jp 2 2026-04-21 2026-10-07
mova.acom.co.jp 3 2025-07-08 2026-07-07
store.acom.co.jp 2 2026-03-30 2026-08-30
mova-reg.acom.co.jp 2 2025-07-08 2026-07-07
www-reg.acom.co.jp 3 2025-07-08 2026-07-07
mail1.reg.acom.co.jp 1 2026-04-16 2026-04-16
mail2.reg.acom.co.jp 1 2026-04-16 2026-04-16
lp.acom.co.jp 6 2026-06-06 2026-09-22
faq.acom.co.jp 12 2026-05-27 2026-09-23
sts.acom.co.jp 2 2026-03-09 2026-09-07
www.acom.co.jp 2 2025-08-22 2026-08-19

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