These entries are queried from radb.net using whois, you can try my project getting these.
:AS393494 route: 52.144.16.0/21 descr: L3TV origin: AS393494 mnt-by: MAINT-AS21928 changed: cameron.byrne [at] t-mobile.com 20180614 #16:43:05Z source: RADB last-modified: 2023-11-13T15:53:47Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 52.144.22.0/24 descr: x origin: AS393494 mnt-by: MAINT-AS21928 changed: cameron.byrne [at] t-mobile.com 20191007 #19:12:46Z source: RADB last-modified: 2023-11-13T15:58:31Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.152.20.0/22 descr: L3TV origin: AS393494 mnt-by: MAINT-AS21928 changed: cameron.byrne [at] t-mobile.com 20180602 #04:09:04Z source: RADB last-modified: 2023-11-13T15:53:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.31.102.0/23 descr: 209.31.102.0 origin: AS393494 mnt-by: MAINT-AS21928 changed: cameron.byrne [at] t-mobile.com 20180803 #03:28:05Z source: RADB last-modified: 2023-11-13T15:54:24Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:f5:c000::/48 descr: L3TV origin: AS393494 mnt-by: MAINT-AS21928 changed: cameron.byrne [at] t-mobile.com 20180614 #16:44:34Z source: RADB last-modified: 2023-11-13T15:53:47Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source