These entries are queried from radb.net using whois, you can try my project getting these.
:AS17937 route: 115.187.92.0/22 descr: Nikkei Advanced Systems Inc. 5-8-1 Minamisuna Koto-ku Tokyo 136-0076 JAPAN origin: AS17937 notify: hostmaster [at] nasnet.co.jp mnt-by: MAINT-AS17937 changed: hostmaster [at] nasnet.co.jp 20090302 #04:37:48Z source: RADB last-modified: 2023-11-13T15:39:58Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 202.26.187.0/24 descr: Nikkei Advanced Systems Inc. 5-8-1 Minamisuna Koto-ku Tokyo 136-0076 JAPAN origin: AS17937 notify: hostmaster [at] nasnet.co.jp mnt-by: MAINT-AS17937 changed: oota [at] nasnet.co.jp 20020214 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 218.216.16.0/20 descr: Nikkei Advanced Systems Inc. 5-8-1 Minamisuna Koto-ku Tokyo 136-0076 JAPAN origin: AS17937 notify: hostmaster [at] nasnet.co.jp mnt-by: MAINT-AS17937 changed: oota [at] nasnet.co.jp 20020129 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2404:cb00::/32 descr: Nikkei Advanced Systems Inc. 5-8-1 Minamisuna Koto-ku Tokyo 136-0076 JAPAN origin: AS17937 notify: hostmaster [at] nasnet.co.jp mnt-by: MAINT-AS17937 changed: hostmaster [at] nasnet.co.jp 20120817 #10:12:39Z source: RADB last-modified: 2023-11-13T15:43:22Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source