These entries are queried from radb.net using whois, you can try my project getting these.
:AS398797 route: 199.255.148.0/22 origin: AS398797 descr: ARIN 2 mnt-by: MAINT-AS398202 changed: josh [at] assetblack.com 20210131 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.255.148.0/22 origin: AS398797 mnt-by: MNT-NL-720 source: ARIN tech-c: MCDON187-ARIN admin-c: MCDON187-ARIN created: 2020-09-02T20:05:33Z last-modified: 2020-09-02T23:37:24Z descr: MNT-NL-720 route 199.255.148.000/22 AS398797 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.255.148.0/22 origin: AS398797 descr: Nubesec LLC mnt-by: MAINT-AS17077 changed: joe.carroll [at] managedinstalls.com 20220611 #12:38:25Z source: RADB last-modified: 2024-01-09T07:00:05Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.255.148.0/23 origin: AS398797 descr: 199.255.148.0/23 admin-c: MCDON187-ARIN tech-c: MCDON187-ARIN mnt-by: MNT-NL-720 created: 2022-06-29T16:37:58Z last-modified: 2022-06-29T16:37:58Z source: ARIN rpki-ov-state: valid route: 199.255.148.0/24 origin: AS398797 descr: 199.255.148.0/24 admin-c: MCDON187-ARIN tech-c: MCDON187-ARIN mnt-by: MNT-NL-720 created: 2022-06-29T16:48:16Z last-modified: 2022-06-29T16:48:16Z source: ARIN rpki-ov-state: valid route: 199.255.148.0/24 origin: AS398797 descr: Nubesec LLC mnt-by: MAINT-AS17077 changed: joe.carroll [at] managedinstalls.com 20220611 #12:39:28Z source: RADB last-modified: 2024-01-09T07:00:05Z rpki-ov-state: valid route: 199.255.149.0/24 origin: AS398797 descr: Nubesec LLC mnt-by: MAINT-AS17077 changed: joe.carroll [at] managedinstalls.com 20220611 #12:40:17Z source: RADB last-modified: 2024-01-09T07:00:05Z rpki-ov-state: valid route: 199.255.149.0/24 origin: AS398797 descr: 199.255.149.0/24 admin-c: MCDON187-ARIN tech-c: MCDON187-ARIN mnt-by: MNT-NL-720 created: 2022-06-29T16:48:45Z last-modified: 2022-06-29T16:48:45Z source: ARIN rpki-ov-state: valid route6: 2602:fd1e::/36 origin: AS398797 mnt-by: MNT-NL-720 source: ARIN tech-c: MCDON187-ARIN admin-c: MCDON187-ARIN created: 2020-09-02T20:06:03Z last-modified: 2020-09-02T23:37:47Z descr: MNT-NL-720 route 2602:FD1E:0000:0000:0000:0000:0000:0000/36 AS398797 rpki-ov-state: valid route6: 2602:fd1e::/36 origin: AS398797 descr: ARIN 2 mnt-by: MAINT-AS398202 changed: josh [at] assetblack.com 20210131 source: NTTCOM rpki-ov-state: valid