These entries are queried from radb.net using whois, you can try my project getting these.
:AS138539 route: 103.132.136.0/22 origin: AS138539 descr: Singapore Telecommunications SingNet Pte Ltd 31 Exeter Road Comcentre Singapore 239732 remarks: This route object was created for a SingNet customer route. Please contact singnet-routing [at] singnet.com.sg if you have any questions regarding this object. mnt-by: MAINT-AS3758 changed: masmar [at] singtel.com 20190311 #03:48:19Z source: RADB last-modified: 2023-11-13T15:55:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 103.132.136.0/22 origin: AS138539 descr: Jewel Changi Airport Trustee Pte. Ltd. 60 Airport Boulevard #046-037 Changi Airport Terminal 2, Singapore 819643 mnt-by: MAINT-JEWEL-SG last-modified: 2020-06-17T03:31:56Z source: APNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2404:39c0::/32 origin: AS138539 descr: Jewel Changi Airport Trustee Pte. Ltd. 60 Airport Boulevard #046-037 Changi Airport Terminal 2, Singapore 819643 mnt-by: MAINT-JEWEL-SG last-modified: 2020-06-17T03:31:56Z source: APNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source