These entries are queried from radb.net using whois, you can try my project getting these.
:AS53713 route: 74.62.38.0/23 descr: RR-RC-National Cement-Los Angeles origin: AS53713 notify: publicipaddressing [at] charter.com mnt-by: MAINT-RR changed: publicipaddressing [at] charter.com 20181017 #22:02:30Z source: RADB last-modified: 2023-11-13T16:15:16Z rpki-ov-state: valid route: 74.62.38.0/23 origin: AS53713 descr: Charter Communications Inc admin-c: IPADD1-ARIN tech-c: IPADD1-ARIN mnt-by: MNT-CC-3517 remarks: This object was automatically created during a customer ROA generation created: 2023-08-09T18:52:56Z last-modified: 2023-08-09T18:52:56Z source: ARIN rpki-ov-state: valid route: 74.62.38.0/24 origin: AS53713 descr: Charter Communications Inc admin-c: IPADD1-ARIN tech-c: IPADD1-ARIN mnt-by: MNT-CC-3517 remarks: This object was automatically created during a customer ROA generation created: 2023-08-09T18:52:56Z last-modified: 2023-08-09T18:52:56Z source: ARIN rpki-ov-state: valid route: 74.62.39.0/24 origin: AS53713 descr: Charter Communications Inc admin-c: IPADD1-ARIN tech-c: IPADD1-ARIN mnt-by: MNT-CC-3517 remarks: This object was automatically created during a customer ROA generation created: 2023-08-09T18:52:56Z last-modified: 2023-08-09T18:52:56Z source: ARIN rpki-ov-state: valid route: 199.204.95.0/24 descr: National Cement Company 15821 Ventura Bl #475 Encino CA origin: AS53713 remarks: National Cement IPv4 Space notify: domreg [at] natcem.com notify: ralphw [at] interworld.net mnt-by: MAINT-AS53713 changed: domreg [at] natcem.com 20191015 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.80.191.0/24 descr: National Cement Company 15821 Ventura Bl #475 Encino CA origin: AS53713 remarks: National Cement IPv4 Space notify: domreg [at] natcem.com notify: ralphw [at] interworld.net mnt-by: MAINT-AS53713 changed: domreg [at] natcem.com 20191015 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.80.191.0/24 descr: National Cement Company origin: AS53713 mnt-by: MAINT-AS27506 changed: yasu.ikehara [at] crowncastle.com 20221013 source: RADB last-modified: 2023-11-13T16:12:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.255.195.0/24 descr: NATIONAL-CEMENT National Cement Company 15821 Ventura Bl 475 origin: AS53713 remarks: National Cement IPv4 space notify: domreg [at] natcem.com mnt-by: MAINT-AS53713 changed: domreg [at] natcem.com 20200517 source: altdb rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:34:8000::/48 descr: National Cement Company descr: 15821 Ventura Bl #475 descr: Encino, CA descr: US origin: AS53713 remarks: National Cement IPv6 Space notify: domreg [at] natcem.com notify: ralphw [at] interworld.net mnt-by: MNT-NATION-11 changed: domreg [at] natcem.com 20110722 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source