These entries are queried from radb.net using whois, you can try my project getting these.
:AS37524 route: 197.148.72.0/21 origin: AS37524 descr: Africell Gambia mnt-by: AFRICELL-GM-MNT changed: *** [at] africell.gm 20201204 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 197.148.72.0/21 descr: AFRICELL GAMBIA origin: AS37524 mnt-by: LIDS-MNT created: 2014-05-28T09:08:30Z last-modified: 2018-09-04T17:56:25Z source: RIPE-NONAUTH remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2c0f:140::/32 origin: AS37524 descr: Africell Gambia mnt-by: AFRICELL-GM-MNT changed: *** [at] africell.gm 20230411 source: AFRINIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source