These entries are queried from radb.net using whois, you can try my project getting these.
:AS61574 route: 138.185.228.0/22 descr: USC/UFMG PEERING Research Testbed remarks: c/o Italo Cunha remarks: c/o Brandon Schlinker remarks: c/o Ethan Katz-Bassett remarks: Departamento de Ciencia da Computacao remarks: Universidade Federal de Minas Gerais remarks: Avenida Presidente Antonio Carlos, 6627 remarks: Pampulha, Belo Horizonte remarks: 31270-010 Brazil origin: AS61574 member-of: RS-PEERING-TESTBED remarks: Project information at http://peering.usc.edu. remarks: Announcements up to /24 granularity. notify: noc [at] peering.usc.edu notify: bschlink [at] usc.edu notify: cunha [at] dcc.ufmg.br mnt-by: MAINT-AS61574 changed: cunha [at] dcc.ufmg.br 20161205 source: BBOI rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.2.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:33Z last-modified: 2020-11-28T00:17:33Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.3.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:33Z last-modified: 2020-11-28T00:17:33Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.4.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:33Z last-modified: 2020-11-28T00:17:33Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.5.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:33Z last-modified: 2020-11-28T00:17:33Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.6.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:34Z last-modified: 2020-11-28T00:17:34Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.10.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:34Z last-modified: 2020-11-28T00:17:34Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.11.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:34Z last-modified: 2020-11-28T00:17:34Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.12.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:34Z last-modified: 2020-11-28T00:17:34Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.13.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:34Z last-modified: 2020-11-28T00:17:34Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.14.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:35Z last-modified: 2020-11-28T00:17:35Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.28.15.0/24 descr: RGnet Westin LAN origin: AS61574 notify: rw [at] rg.net mnt-by: MAINT-RGNET created: 2020-11-28T00:17:35Z last-modified: 2020-11-28T00:17:35Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:269c::/32 descr: USC/UFMG PEERING Research Testbed remarks: c/o Italo Cunha remarks: c/o Brandon Schlinker remarks: c/o Ethan Katz-Bassett remarks: Departamento de Ciencia da Computacao remarks: Universidade Federal de Minas Gerais remarks: Avenida Presidente Antonio Carlos, 6627 remarks: Pampulha, Belo Horizonte remarks: 31270-010 Brazil origin: AS61574 member-of: RS-PEERING-TESTBED remarks: Project information at http://peering.usc.edu. remarks: Announcements up to /48 granularity. notify: noc [at] peering.usc.edu notify: bschlink [at] usc.edu notify: cunha [at] dcc.ufmg.br mnt-by: MAINT-AS61574 changed: cunha [at] dcc.ufmg.br 20161205 source: BBOI rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:269c:fe54::/48 origin: AS61574 descr: Proxy registration for PEERING testbed mnt-by: MAINT-ESNET changed: dwcarder [at] es.net 20230919 #14:47:24Z source: RADB last-modified: 2023-11-13T16:18:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2804:269c:fe56::/48 origin: AS61574 descr: Proxy registration for PEERING testbed mnt-by: MAINT-ESNET changed: dwcarder [at] es.net 20230919 #14:48:42Z source: RADB last-modified: 2023-11-13T16:18:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source