These entries are queried from radb.net using whois, you can try my project getting these.
:AS3676 route: 128.255.0.0/16 descr: University of Iowa Iowa City, Iowa, USA origin: AS3676 remarks: University of Iowa main campus network mnt-by: MAINT-UIOWA changed: jay-ford [at] uiowa.edu 20000221 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: valid route: 129.255.0.0/16 descr: University of Iowa Iowa City, Iowa, USA origin: AS3676 remarks: University of Iowa medical campus network mnt-by: MAINT-UIOWA changed: jay-ford [at] uiowa.edu 20000221 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: valid route: 198.49.182.0/24 descr: University of Iowa Iowa City, Iowa, USA origin: AS3676 remarks: University of Iowa auxiliary networks mnt-by: MAINT-UIOWA changed: jay-ford [at] uiowa.edu 20001211 changed: jay-ford [at] uiowa.edu 20080311 #14:11:26(UTC) source: RADB last-modified: 2023-11-13T15:39:55Z rpki-ov-state: valid route6: 2620:0:e50::/44 descr: University of Iowa, Iowa City, Iowa, USA origin: AS3676 remarks: University of Iowa networks mnt-by: MAINT-UIOWA changed: jay-ford [at] uiowa.edu 20170209 #15:20:21Z source: RADB last-modified: 2023-11-13T15:50:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:0:e50::/45 descr: University of Iowa, Iowa City, Iowa, USA origin: AS3676 remarks: University of Iowa networks, main campus mnt-by: MAINT-UIOWA changed: jay-ford [at] uiowa.edu 20180301 #20:09:50Z source: RADB last-modified: 2023-11-13T15:53:20Z rpki-ov-state: valid