These entries are queried from radb.net using whois, you can try my project getting these.
:AS6561 route: 104.142.0.0/17 descr: JUCE Main 1 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.142.48.0/20 descr: JUCE V2 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.142.64.0/19 descr: JUCE W1 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.142.96.0/21 descr: JUCE W2 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.142.104.0/22 descr: JUCE W3 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.142.111.0/24 descr: JUCE V0 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.142.112.0/20 descr: JUCE V1 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.163.0.0/17 descr: JUCE Main 2 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190617 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2604:13c0::/32 descr: JUCE V6 origin: AS6561 mnt-by: MNT-JC-114 changed: ningyan [at] juce.ca 20190621 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source