These entries are queried from radb.net using whois, you can try my project getting these.
:AS135141 route: 203.158.160.0/20 descr: Rajamangala University of Technology LanNa network origin: AS135141 notify: teppap [at] rmutl.ac.th notify: noc [at] uni.net.th mnt-by: MAINT-AS4621 changed: tawee [at] uni.net.th 20160523 #10:00:50Z source: RADB last-modified: 2023-11-13T15:55:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.160.0/21 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.160.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.161.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.162.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.163.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.164.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.165.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.166.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.167.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.168.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.169.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.170.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.171.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.172.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.173.0/24 descr: AWN route object for SBN-ISP-Corp origin: AS135141 remarks: Please contact sbn-noc [at] ais.co.th if you have any questions regarding this object mnt-by: MAINT-AS45430 changed: niponphu [at] ais.co.th 20160420 #10:49:51Z source: RADB last-modified: 2023-11-13T15:49:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.174.0/24 descr: Rajamangala University of Technology LanNa network origin: AS135141 notify: teppap [at] rmutl.ac.th notify: noc [at] uni.net.th mnt-by: MAINT-AS4621 changed: tawee [at] uni.net.th 20160610 #11:26:51Z source: RADB last-modified: 2023-11-13T15:55:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.158.175.0/24 descr: Rajamangala University of Technology LanNa network origin: AS135141 notify: teppap [at] rmutl.ac.th notify: noc [at] uni.net.th mnt-by: MAINT-AS4621 changed: tawee [at] uni.net.th 20160610 #11:27:57Z source: RADB last-modified: 2023-11-13T15:55:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2001:3c8:5008::/48 descr: Rajamangala University of Technology LanNa network origin: AS135141 notify: teppap [at] rmutl.ac.th notify: noc [at] uni.net.th mnt-by: MAINT-AS4621 changed: tawee [at] uni.net.th 20160523 #10:02:17Z source: RADB last-modified: 2023-11-13T15:55:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source