These entries are queried from radb.net using whois, you can try my project getting these.
:AS17977 route: 120.72.64.0/20 origin: AS17977 descr: Singapore Telecom Japan Ltd NF Park Building, 3F 9-15, Futaba 2-Chome Shinagawa mnt-by: MAINT-JP-STJP last-modified: 2023-04-21T05:08:27Z source: APNIC rpki-ov-state: valid route: 203.173.64.0/20 descr: SINGTEL-JP descr: Temporary or proxy registration origin: AS17977 notify: ipr [at] gin.ntt.net mnt-by: MAINT-NTTCOM-BB changed: kpack [at] gin.ntt.net 20200428 source: NTTCOM rpki-ov-state: valid route: 203.173.64.0/20 origin: AS17977 descr: Singapore Telecom Japan Ltd NF Park Building, 3F 9-15, Futaba 2-Chome Shinagawa mnt-by: MAINT-JP-STJP last-modified: 2023-04-21T05:08:51Z source: APNIC rpki-ov-state: valid route: 220.232.57.0/24 descr: SINGTEL-JP origin: AS17977 notify: g-expan_jp [at] singtel.com mnt-by: MAINT-AS17977 changed: g-expan_jp [at] singtel.com 20090106 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2404:1000::/32 origin: AS17977 descr: Singapore Telecom Japan Ltd NF Park Building, 3F 9-15, Futaba 2-Chome Shinagawa mnt-by: MAINT-JP-STJP last-modified: 2023-04-21T05:09:16Z source: APNIC rpki-ov-state: valid