These entries are queried from radb.net using whois, you can try my project getting these.
:AS45489 route: 103.87.124.0/23 descr: SLT Global network origin: AS45489 admin-c: Asela Galappattige tech-c: R.P.D.C Kaushalya notify: nwadmin [at] sltnet.lk mnt-by: MAINT-AS9329 changed: kaushalya [at] slt.com.lk 20180205 #02:55:17Z source: RADB last-modified: 2023-11-13T15:53:17Z rpki-ov-state: valid route: 103.87.124.0/23 origin: AS45489 descr: Sri Lanka Telecom Ltd Lotus Road OTS Building. 7 / F ISP Opeartions Section mnt-by: MNT-SLT-LK last-modified: 2018-02-06T02:31:23Z source: APNIC rpki-ov-state: valid route: 103.87.124.0/24 origin: AS45489 descr: Sri Lanka Telecom Ltd Lotus Road OTS Building. 7 / F ISP Opeartions Section mnt-by: MNT-SLT-LK last-modified: 2019-10-14T08:28:09Z source: APNIC rpki-ov-state: valid route: 103.87.124.0/24 descr: SLT Global network origin: AS45489 admin-c: Asela Galappattige tech-c: R.P.D.C Kaushalya notify: nwadmin [at] sltnet.lk mnt-by: MAINT-AS9329 changed: kaushalya [at] slt.com.lk 20180205 #02:56:33Z source: RADB last-modified: 2023-11-13T15:53:17Z rpki-ov-state: valid route: 103.87.125.0/24 origin: AS45489 descr: SLT Global network admin-c: Asela Galappattige tech-c: R.P.D.C Kaushalya notify: nwadmin [at] slt.com.lk mnt-by: MAINT-AS9329 changed: kaushalya [at] slt.com.lk 20220422 #11:46:21Z source: RADB last-modified: 2023-11-13T16:10:52Z rpki-ov-state: valid route: 103.87.125.0/24 origin: AS45489 descr: Sri Lanka Telecom Ltd Lotus Road OTS Building. 7 / F ISP Opeartions Section mnt-by: MNT-SLT-LK last-modified: 2019-10-14T08:28:09Z source: APNIC rpki-ov-state: valid route: 203.96.160.0/22 origin: AS45489 descr: Sri Lanka Telecom Ltd Lotus Road OTS Building. 7 / F ISP Opeartions Section mnt-by: MNT-SLT-LK last-modified: 2020-06-26T03:09:03Z source: APNIC rpki-ov-state: valid route: 203.96.160.0/22 origin: AS45489 descr: SLT Global Network admin-c: Asela Galappattige tech-c: R.P.D.C Kaushalya notify: nwadmin [at] slt.com.lk notify: kaushalya [at] slt.com.lk mnt-by: MAINT-AS9329 changed: nwadmin [at] slt.com.lk 20200811 #03:23:52Z source: RADB last-modified: 2023-11-13T16:01:31Z rpki-ov-state: valid route6: 2001:df4:1b00::/48 origin: AS45489 descr: Sri Lanka Telecom Ltd Lotus Road OTS Building. 7 / F ISP Opeartions Section mnt-by: MNT-SLT-LK last-modified: 2018-02-06T02:33:04Z source: APNIC rpki-ov-state: valid route6: 2001:df4:1b00::/48 origin: AS45489 descr: SLT Global network notify: nwadmin [at] slt.com.lk mnt-by: MAINT-AS9329 changed: kaushalya [at] slt.com.lk 20220422 #11:45:09Z source: RADB last-modified: 2023-11-13T16:10:52Z rpki-ov-state: valid