These entries are queried from radb.net using whois, you can try my project getting these.
:AS22847 route: 66.63.115.0/24 descr: Bowdoin College origin: AS22847 mnt-by: MAINT-TVC changed: dan [at] firstlight.net 20170517 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 66.63.115.0/24 descr: RR-RC-Bowdoin College-Portland origin: AS22847 notify: publicipaddressing [at] charter.com mnt-by: MAINT-RR changed: publicipaddressing [at] charter.com 20181017 #22:02:30Z source: RADB last-modified: 2023-11-13T16:15:00Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 139.140.0.0/16 descr: Bowdoin College origin: AS22847 mnt-by: MAINT-TVC changed: dan [at] firstlight.net 20151202 source: ALTDB rpki-ov-state: valid route: 216.195.188.0/22 descr: Bowdoin College origin: AS22847 mnt-by: MAINT-TVC changed: dan [at] firstlight.net 20150630 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:0:2b70::/44 descr: Bowdoin College origin: AS22847 mnt-by: MAINT-TVC changed: dan [at] firstlight.net 20170517 source: ALTDB rpki-ov-state: valid route6: 2620:0:2b70::/48 descr: RR-RC-Bowdoin College (University of Maine)-Portland origin: AS22847 mnt-by: MAINT-RR changed: publicipaddressing [at] charter.com 20181017 #22:02:30Z source: RADB last-modified: 2023-11-13T16:15:00Z rpki-ov-state: valid route6: 2620:0:2b79::/48 descr: Bowdoin IPV6-BLK-2 origin: AS22847 mnt-by: MAINT-AS5760 changed: willd [at] staff.gwi.net 20200701 source: ALTDB rpki-ov-state: valid