These entries are queried from radb.net using whois, you can try my project getting these.
:AS4901 route: 162.250.136.0/22 descr: CAAREN IPv4 descr: 801 22nd ST NW descr: Washington, DC 20052 descr: US origin: AS4901 mnt-by: MNT-GWU-5 changed: agallo [at] gwu.edu 20171218 source: ARIN rpki-ov-state: valid route6: 2620:118:5000::/44 descr: CAAREN IPv6 descr: 801 22nd ST NW descr: Washington, DC 20052 descr: US origin: AS4901 mnt-by: MNT-GWU-5 changed: agallo [at] gwu.edu 20171218 source: ARIN rpki-ov-state: valid