It can be anything! An apex, subdomain, or even a URL.

Results forroot.sainet.or.jp

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2025-08-14T09:01:11.632	2025-08-14T00:51:58	2026-08-31T14:59:59	*.sainet.or.jp	*.sainet.or.jp	C=JP, O="Japan Registry Services Co., Ltd.", CN=JPRS Domain Validation Authority - G4
2025-08-14T01:01:59.706	2025-08-14T00:51:58	2026-08-31T14:59:59	*.sainet.or.jp	*.sainet.or.jp	C=JP, O="Japan Registry Services Co., Ltd.", CN=JPRS Domain Validation Authority - G4
2024-08-21T00:27:13.305	2024-08-21T00:17:13	2025-08-31T14:59:59	*.sainet.or.jp	*.sainet.or.jp	C=JP, O="Japan Registry Services Co., Ltd.", CN=JPRS Domain Validation Authority - G4
2023-08-24T05:41:56.96	2023-08-24T05:31:56	2024-08-31T14:59:59	*.sainet.or.jp	*.sainet.or.jp	C=JP, O="Japan Registry Services Co., Ltd.", CN=JPRS Domain Validation Authority - G4
2022-08-09T08:27:47.047	2022-08-09T08:17:46	2023-08-31T14:59:59	*.sainet.or.jp	*.sainet.or.jp	C=JP, O="Japan Registry Services Co., Ltd.", CN=JPRS Domain Validation Authority - G4
2021-08-24T04:42:10.911	2021-08-24T04:32:10	2022-08-31T14:59:59	*.sainet.or.jp	*.sainet.or.jp	C=JP, O="Japan Registry Services Co., Ltd.", CN=JPRS Domain Validation Authority - G4