These entries are queried from radb.net using whois, you can try my project getting these.
:AS137919 route: 110.49.38.0/24 descr: SBN route object for CSL- Bangkok Mass Transit System Public Co., Ltd origin: AS137919 remarks: Please contact awn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: puriphak [at] ais.co.th 20180625 #08:58:06Z source: RADB last-modified: 2023-11-13T15:54:00Z rpki-ov-state: valid route: 147.50.0.0/24 descr: Bangkok Mass Transit System PCL.(BTS) origin: AS137919 mnt-by: MAINT-AS4750 changed: bgpadmin [at] csloxinfo.net 20180621 #06:28:27Z source: RADB last-modified: 2023-11-13T15:54:00Z rpki-ov-state: valid