These entries are queried from radb.net using whois, you can try my project getting these.
:AS11939 route: 144.212.0.0/16 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 member-of: RS-COMM_NSFNET mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:38:44Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.3.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #20:55:21Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.4.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:35:29Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.5.0/24 origin: AS11939 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20230927 #22:38:52Z source: RADB last-modified: 2023-11-13T16:18:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.6.0/24 origin: AS11939 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20230927 #22:39:45Z source: RADB last-modified: 2023-11-13T16:18:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.7.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:34:21Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.10.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:39:49Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.20.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:40:16Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.128.0/21 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:40:34Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.138.0/24 origin: AS11939 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20230927 #22:41:06Z source: RADB last-modified: 2023-11-13T16:18:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.139.0/24 origin: AS11939 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20230927 #22:41:40Z source: RADB last-modified: 2023-11-13T16:18:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.160.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:40:52Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.192.0/23 origin: AS11939 descr: MathWorks, Inc. 3 Apple Hill Drive Natick MA 01760 USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20230510 #15:38:55Z source: RADB last-modified: 2023-11-13T16:17:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.192.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:38:14Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.193.0/24 origin: AS11939 descr: MathWorks, Inc. 3 Apple Hill Drive Natick MA 01760 USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20220622 #13:28:05Z source: RADB last-modified: 2023-11-13T16:11:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.228.0/24 origin: AS11939 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA mnt-by: MAINT-AS11939 changed: network-admin [at] mathworks.com 20211130 #14:15:09Z source: RADB last-modified: 2023-11-13T16:08:56Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.244.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:37:12Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 144.212.248.0/24 descr: Math Works, Inc. 3 Apple Hill Drive Natick MA 01760, USA origin: AS11939 mnt-by: MAINT-AS11939 changed: network [at] mathworks.com 20151104 #16:31:15Z source: RADB last-modified: 2023-11-13T15:48:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source