These entries are queried from radb.net using whois, you can try my project getting these.
:AS137856 route: 203.159.76.0/22 descr: CAT route object for TCCT-DOMESTIC-AS-AP origin: AS137856 mnt-by: MAINT-THIX-CAT-TH changed: catdb [at] cat.net.th 20190610 source: RADB last-modified: 2023-11-13T15:56:38Z rpki-ov-state: valid route: 203.159.76.0/22 descr: Thai Network Information Center Foundation origin: AS137856 mnt-by: MAINT-TNICF-TH last-modified: 2019-03-09T06:15:31Z source: APNIC rpki-ov-state: valid route: 203.159.76.0/23 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-03-19T09:24:00Z source: APNIC rpki-ov-state: valid route: 203.159.76.0/24 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-03-19T09:24:00Z source: APNIC rpki-ov-state: valid route: 203.159.77.0/24 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-03-19T09:24:00Z source: APNIC rpki-ov-state: valid route: 203.159.78.0/23 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-03-19T09:24:00Z source: APNIC rpki-ov-state: valid route: 203.159.78.0/24 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-03-19T09:24:01Z source: APNIC rpki-ov-state: valid route: 203.159.79.0/24 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-03-19T09:24:01Z source: APNIC rpki-ov-state: valid route6: 2405:3340::/32 descr: CAT route object for UniNet origin: AS137856 mnt-by: MAINT-THIX-CAT-TH changed: catdb [at] cat.net.th 20190906 source: RADB last-modified: 2023-11-13T15:57:24Z rpki-ov-state: valid route6: 2405:3340::/32 origin: AS137856 descr: Thai Network Information Center Foundation 159 Pichai Rd. Thanon Nakhon Chai Si mnt-by: MAINT-TNICF-TH last-modified: 2019-08-27T08:35:33Z source: APNIC rpki-ov-state: valid route6: 2405:3340::/48 descr: Net2Home (Social Enterprise) Co., Ltd. mnt-by: MAINT-TNICF-TH origin: AS137856 last-modified: 2021-06-21T12:34:18Z source: APNIC rpki-ov-state: valid