These entries are queried from radb.net using whois, you can try my project getting these.
:AS637 route: 138.157.40.0/21 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 138.163.160.0/22 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 138.168.0.0/16 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.156.13.0/24 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.156.33.0/24 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.223.78.0/23 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.223.150.0/24 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 214.15.251.0/24 descr: CenturyLink Proxy object remarks: to be deleted in March 2017 origin: AS637 notify: job [at] ntt.net mnt-by: MAINT-JOB changed: job [at] ntt.net 20160901 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source