These entries are queried from radb.net using whois, you can try my project getting these.
:AS29726 route: 77.73.152.0/21 descr: Vonage Holdings 23 Main St Holmdel, NJ 07733 USA origin: AS29726 mnt-by: MAINT-VONAGE changed: irr [at] vonage.com 20070917 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 77.73.152.0/21 descr: Vonage London RIPE Allocated origin: AS29726 mnt-by: MAINT-AS17151 changed: irr [at] vonage.com 20110204 #21:46:56Z source: RADB last-modified: 2023-11-13T15:41:15Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 77.73.152.0/24 descr: Vonage Holdings 23 Main St Holmdel, NJ 07733 USA origin: AS29726 mnt-by: MAINT-VONAGE changed: irr [at] vonage.com 20070910 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 77.73.156.0/24 origin: AS29726 descr: Vonage Poland Office admin-c: MK00-RADB tech-c: MK00-RADB mnt-by: MAINT-AS17151 changed: matthew.kirkham [at] vonage.com 20240308 # 1926Z source: RADB last-modified: 2024-03-08T19:26:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 77.73.158.0/24 origin: AS29726 descr: Vonage London Office admin-c: MAINT-17151 tech-c: MAINT-17151 mnt-by: MAINT-AS17151 changed: matthew.kirkham [at] vonage.com 20230714 #17:03:24Z source: RADB last-modified: 2023-11-13T16:17:47Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source