These entries are queried from radb.net using whois, you can try my project getting these.
:AS4237 route: 20.137.160.0/20 origin: AS4237 descr: DXC Technology CDC Chicago, IL, US admin-c: DXC IPADDR tech-c: DXC IPADDR notify: ipaddr [at] dxc.com mnt-by: AS71-MNT changed: tomas.kostrian [at] dxc.com 20230908 #17:06:46Z source: RADB last-modified: 2023-11-13T16:18:34Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 20.139.8.0/22 descr: To allow routing to other ISPs origin: AS4237 mnt-by: MAINT-AS7132 changed: peering [at] intl.att.com 20190903 source: RADB last-modified: 2023-11-13T15:57:21Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 20.139.121.0/24 descr: To allow routing to other ISPs origin: AS4237 mnt-by: MAINT-AS7132 changed: daniel.rueegg [at] intl.att.com 20200914 source: RADB last-modified: 2023-11-13T16:01:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 20.139.144.0/21 descr: CMI IP Transit origin: AS4237 admin-c: MAINT-CMI-INT-HK tech-c: MAINT-CMI-INT-HK mnt-by: MAINT-CMI-INT-HK changed: qas_support [at] cmi.chinamobile.com 20180620 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 20.139.144.0/21 descr: CMI (Customer Route) origin: AS4237 mnt-by: MAINT-AS58453 changed: qas_support [at] cmi.chinamobile.com 20180620 source: RADB last-modified: 2023-11-13T15:54:00Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 20.139.217.0/24 descr: To allow routing to other ISPs origin: AS4237 mnt-by: MAINT-AS7132 changed: daniel.rueegg [at] intl.att.com 20200914 source: RADB last-modified: 2023-11-13T16:01:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.12.77.0/24 descr: To allow routing to other ISPs origin: AS4237 mnt-by: MAINT-AS7132 changed: daniel.rueegg [at] intl.att.com 20221124 source: RADB last-modified: 2023-11-13T16:13:09Z rpki-ov-state: valid route: 203.12.77.0/24 origin: AS4237 descr: DXC Technology Australia Pty Limited 26 Talavera Road mnt-by: MAINT-AU-DTAPL last-modified: 2023-08-31T14:12:53Z source: APNIC rpki-ov-state: valid