These entries are queried from radb.net using whois, you can try my project getting these.
:AS399812 route: 64.29.136.0/24 origin: AS399812 descr: United Layer - SIN-1 mnt-by: MAINT-AS54103 changed: support [at] modmc.net 20210716 #11:29:50Z source: RADB last-modified: 2023-11-13T16:07:53Z rpki-ov-state: valid route: 64.29.136.0/24 descr: UnitedLayer NOC +1 415 349 2102 - SIN1 origin: AS399812 mnt-by: MAINT-UNITEDLAYER changed: aaron [at] unitedlayer.com 20210701 source: ALTDB rpki-ov-state: valid route6: 2607:f3a0:a008::/48 origin: AS399812 descr: United Layer- SIN-1 mnt-by: MAINT-AS54103 changed: support [at] modmc.net 20210716 #11:26:20Z source: RADB last-modified: 2023-11-13T16:07:53Z rpki-ov-state: valid route6: 2607:f3a0:a008::/48 descr: UnitedLayer NOC +1 415 349 2102 - SIN1 origin: AS399812 mnt-by: MAINT-UNITEDLAYER changed: aaron [at] unitedlayer.com 20210701 source: ALTDB rpki-ov-state: valid