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.

40 hosts · 255 ms

HostCertsFirst seenLast seenDNS
skygroup.jp 2 2026-02-02 2026-06-01 nodata
*.skygroup.jp 1 2026-06-01 2026-06-01 —
blog2.skygroup.jp 4 2025-09-05 2026-08-30 ok
*.blog2.skygroup.jp 4 2025-09-05 2026-08-30 —
www8.skygroup.jp 2 2026-03-30 2026-08-30 ok
*.www8.skygroup.jp 2 2026-03-30 2026-08-30 —
jinjikouka.skygroup.jp 1 2026-02-16 2026-02-16 nxdomain
*.jinjikouka.skygroup.jp 1 2026-02-16 2026-02-16 —
test-murata.skygroup.jp 3 2026-07-08 2026-07-08 nxdomain
timecard.skygroup.jp 3 2025-06-11 2026-05-12 ok
*.timecard.skygroup.jp 3 2025-06-11 2026-05-12 —
productupdate.skygroup.jp 1 2026-06-01 2026-06-01 ok
keeperautomate.skygroup.jp 1 2025-12-02 2025-12-02 ok
reg.skygroup.jp 1 2026-02-02 2026-02-02 ok
moblog.skygroup.jp 3 2026-01-14 2026-08-30 ok
*.moblog.skygroup.jp 3 2026-01-14 2026-08-30 —
anpi.skygroup.jp 2 2025-11-26 2026-01-14 ok
*.anpi.skygroup.jp 2 2025-11-26 2026-01-14 —
oskanpi.skygroup.jp 1 2025-11-26 2025-11-26 ok
*.oskanpi.skygroup.jp 1 2025-11-26 2025-11-26 —
tkyanpi.skygroup.jp 1 2025-11-26 2025-11-26 ok
*.tkyanpi.skygroup.jp 1 2025-11-26 2025-11-26 —
partner-portal.skygroup.jp 2 2026-02-13 2026-02-13 ok
skyskill.skygroup.jp 1 2026-01-27 2026-01-27 nxdomain
*.skyskill.skygroup.jp 1 2026-01-27 2026-01-27 —
em.skygroup.jp 10 2026-05-07 2026-09-03 ok
skynowm.skygroup.jp 3 2026-01-14 2026-08-30 ok
*.skynowm.skygroup.jp 3 2026-01-14 2026-08-30 —
cert-auto-renewal-demo.skygroup.jp 35 2026-05-14 2026-09-11 ok
blogp.skygroup.jp 2 2026-03-30 2026-08-30 nxdomain
*.blogp.skygroup.jp 2 2026-03-30 2026-08-30 —
pages.skygroup.jp 10 2026-05-06 2026-09-02 ok
blogrss.skygroup.jp 2 2026-03-30 2026-08-30 ok
*.blogrss.skygroup.jp 2 2026-03-30 2026-08-30 —
cert-auto-renewal-cloudfront.skygroup.jp 2 2026-07-30 2026-07-30 nxdomain
skyknow.skygroup.jp 1 2026-06-03 2026-06-03 ok
skynow.skygroup.jp 3 2026-01-14 2026-08-30 ok
*.skynow.skygroup.jp 3 2026-01-14 2026-08-30 —
www.skygroup.jp 1 2026-02-02 2026-02-02 ok
cert-auto-renewal-nginx.skygroup.jp 3 2026-07-07 2026-07-30 ok

Programmatic access, with DNS A records: API GET /v1/hosts/skygroup.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/skygroup.jp.