These entries are queried from radb.net using whois, you can try my project getting these.
:AS38503 route: 121.100.16.0/21 descr: Trans for AS7713 origin: AS38503 remarks: admin contact mail to ipnoc [at] telekommalaysia.com.hk remarks: tech contact mail to ipnoc [at] telekommalaysia.com.hk notify: ipnoc [at] telekommalaysia.com.hk mnt-by: MAINT-TMHKNTT changed: ipnoc [at] telekommalaysia.com.hk 20071030 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.16.0/21 descr: Proxy-registered route object origin: AS38503 notify: radb [at] hutchcity.com mnt-by: MAINT-AS9304 changed: radb [at] hutchcity.com 20121119 source: RADB last-modified: 2023-11-13T15:44:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/22 descr: route-object for AS23947 origin: AS38503 remarks: Transit via AS2914 Customers notify: support [at] ntt.net.id mnt-by: MAINT-AS10217 changed: reza.febrialdy [at] ntt.co.id 20150108 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/22 descr: Proxy-registered route object origin: AS38503 notify: radb [at] hutchcity.com mnt-by: MAINT-AS9304 changed: radb [at] hutchcity.com 20121119 source: RADB last-modified: 2023-11-13T15:44:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/23 descr: route-object for AS23947 origin: AS38503 remarks: Transit via AS2914 Customers notify: support [at] ntt.net.id mnt-by: MAINT-AS10217 changed: reza.febrialdy [at] ntt.co.id 20150108 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/23 descr: Proxy-registered route object origin: AS38503 notify: radb [at] hutchcity.com mnt-by: MAINT-AS9304 changed: radb [at] hutchcity.com 20121119 source: RADB last-modified: 2023-11-13T15:44:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/24 descr: Trans for AS7713 origin: AS38503 remarks: admin contact mail to ipnoc [at] telekommalaysia.com.hk remarks: tech contact mail to ipnoc [at] telekommalaysia.com.hk notify: ipnoc [at] telekommalaysia.com.hk mnt-by: MAINT-TMHKNTT changed: ipnoc [at] telekommalaysia.com.hk 20071030 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/24 descr: Route object of NOC, Solo descr: Indomaya Wira Sejahtera, P.T descr: Internet Service Provider descr: Surakarta - Indonesia origin: AS38503 country: ID remarks: Send Spam & Abuse report to: ******** mnt-by: MAINT-ID-INDOMAYA last-modified: 2008-09-04T07:55:16Z source: APNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/24 descr: Route object of NOC, Solo descr: Indomaya Wira Sejahtera, P.T descr: Internet Service Provider descr: Surakarta - Indonesia origin: AS38503 country: ID remarks: Send Spam & Abuse report to: abuse [at] indomaya.net.id mnt-by: MAINT-ID-INDOMAYA last-modified: 2008-09-04T07:55:16Z source: IDNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.20.0/24 descr: Proxy-registered route object origin: AS38503 notify: radb [at] hutchcity.com mnt-by: MAINT-AS9304 changed: radb [at] hutchcity.com 20121119 source: RADB last-modified: 2023-11-13T15:44:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.21.0/24 descr: Route object of Izone, Solo descr: Indomaya Wira Sejahtera, P.T descr: Internet Service Provider descr: Indonesia origin: AS38503 country: ID remarks: Send Spam & Abuse report to: abuse [at] indomaya.net.id mnt-by: MAINT-ID-INDOMAYA last-modified: 2008-09-04T07:54:57Z source: IDNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.21.0/24 descr: Trans for AS7713 origin: AS38503 remarks: admin contact mail to ipnoc [at] telekommalaysia.com.hk remarks: tech contact mail to ipnoc [at] telekommalaysia.com.hk notify: ipnoc [at] telekommalaysia.com.hk mnt-by: MAINT-TMHKNTT changed: ipnoc [at] telekommalaysia.com.hk 20071030 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.21.0/24 descr: Route object of Izone, Solo descr: Indomaya Wira Sejahtera, P.T descr: Internet Service Provider descr: Indonesia origin: AS38503 country: ID remarks: Send Spam & Abuse report to: ******** mnt-by: MAINT-ID-INDOMAYA last-modified: 2008-09-04T07:54:57Z source: APNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.100.21.0/24 descr: Proxy-registered route object origin: AS38503 notify: radb [at] hutchcity.com mnt-by: MAINT-AS9304 changed: radb [at] hutchcity.com 20121119 source: RADB last-modified: 2023-11-13T15:44:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source