These entries are queried from radb.net using whois, you can try my project getting these.
:AS13821 route: 206.218.206.0/24 descr: Proxy Registration for Alliance Bernstein origin: AS13821 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20201216 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.207.0/24 descr: Proxy Registration for Alliance Bernstein origin: AS13821 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20201216 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.209.0/24 descr: Proxy Registration for Alliance Bernstein origin: AS13821 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20201216 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.213.0/24 origin: AS13821 descr: New Edge mnt-by: MAINT-AS62833 changed: ghutchison [at] extenetsystems.com 20230412 #16:25:29Z source: RADB last-modified: 2023-11-13T16:15:58Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.214.0/23 descr: AllianceBernstein L.P. origin: AS13821 mnt-by: MAINT-AS27506 changed: robert.hinst [at] crowncastle.com 20190331 source: RADB last-modified: 2023-11-13T15:55:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.214.0/24 origin: AS13821 descr: New Edge mnt-by: MAINT-AS62833 changed: ghutchison [at] extenetsystems.com 20230130 #21:20:01Z source: RADB last-modified: 2023-11-13T16:13:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.215.0/24 origin: AS13821 descr: New Edge mnt-by: MAINT-AS62833 changed: ghutchison [at] extenetsystems.com 20230130 #21:20:39Z source: RADB last-modified: 2023-11-13T16:13:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.216.0/24 descr: AllianceBernstein, LP origin: AS13821 mnt-by: MAINT-AS27506 changed: dino.barrow [at] crowncastle.com 20230203 source: RADB last-modified: 2023-11-13T16:13:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.217.0/24 descr: AllianceBernstein, LP origin: AS13821 mnt-by: MAINT-AS27506 changed: dino.barrow [at] crowncastle.com 20230203 source: RADB last-modified: 2023-11-13T16:13:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.223.0/24 origin: AS13821 descr: New Edge mnt-by: MAINT-AS62833 changed: ghutchison [at] extenetsystems.com 20230130 #21:21:13Z source: RADB last-modified: 2023-11-13T16:13:50Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.232.0/24 origin: AS13821 descr: AllianceBernstein Singapore DMZ admin-c: CTD2-ARIN tech-c: NETWO8434-ARIN mnt-by: MNT-ALLIA-75 created: 2024-04-18T06:50:21Z last-modified: 2024-04-18T06:50:21Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.234.0/24 descr: PNAP-LON aci origin: AS13821 mnt-by: MAINT-AS1828 changed: pschissel [at] internap.com 20071022 source: RADB last-modified: 2023-11-13T16:14:13Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.234.0/24 origin: AS13821 descr: AllianceBernstein London Hounslow DMZ admin-c: CTD2-ARIN tech-c: NETWO8434-ARIN mnt-by: MNT-ALLIA-75 created: 2024-04-15T09:09:23Z last-modified: 2024-04-15T09:09:23Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.235.0/24 origin: AS13821 descr: AllianceBernstein London Romford DMZ admin-c: CTD2-ARIN tech-c: NETWO8434-ARIN mnt-by: MNT-ALLIA-75 created: 2024-04-15T09:08:33Z last-modified: 2024-04-15T09:08:33Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.246.0/23 descr: Proxy Registration for Alliance Bernstein by DLR origin: AS13821 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20221015 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.218.246.0/24 descr: Wall Street origin: AS13821 mnt-by: MAINT-AS27506 changed: dataoperations [at] rcnmetro.com 20110719 #17:17:42Z source: RADB last-modified: 2023-11-13T15:42:43Z rpki-ov-state: valid route: 206.218.246.0/24 descr: Proxy Registration for Alliance Bernstein origin: AS13821 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20210623 source: ALTDB rpki-ov-state: valid route: 209.191.168.0/23 descr: PNAP-PHI alliance origin: AS13821 mnt-by: MAINT-AS1828 changed: apryor [at] internap.com 20040416 source: RADB last-modified: 2023-11-13T16:13:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.191.168.0/24 descr: PNAP-NYM alliance origin: AS13821 mnt-by: MAINT-AS1828 changed: dom [at] internap.com 20010919 source: RADB last-modified: 2023-11-13T16:13:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.191.169.0/24 descr: PNAP-PHI alliance origin: AS13821 mnt-by: MAINT-AS1828 changed: apryor [at] internap.com 20040416 source: RADB last-modified: 2023-11-13T16:13:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 216.52.91.0/24 descr: PNAP-PHI alliance origin: AS13821 mnt-by: MAINT-AS1828 changed: apryor [at] internap.com 20040416 source: RADB last-modified: 2023-11-13T16:13:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source