These entries are queried from radb.net using whois, you can try my project getting these.
:AS9488 route: 147.46.0.0/15 descr: Proxy-registered route object origin: AS9488 remarks: This route object is for a BtN customer route remarks: which is being exported under this origin AS. remarks: remarks: This route object was created because no existing remarks: route object with the same origin was found, and remarks: since some BtN peers filter based on these objects remarks: this route may be rejected if this object is not created. remarks: remarks: Please contact peering [at] cais.net if you have any remarks: questions regarding this object. mnt-by: MAINT-AS3491 changed: sajwani [at] pccwbtn.com 20080505 source: RADB last-modified: 2023-11-13T15:42:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.46.0.0/16 descr: Seoul National University origin: AS9488 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20100121 source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.46.0.0/16 descr: proxy for HANARO TELECOM route origin: AS9488 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.46.0.0/19 origin: AS9488 descr: AS 9488 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20201221 #04:10:26Z source: RADB last-modified: 2023-11-13T16:03:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.46.10.0/24 origin: AS9488 descr: AS 9488 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20190902 #07:08:43Z source: RADB last-modified: 2023-11-13T15:57:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.46.32.0/19 origin: AS9488 descr: AS 9488 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20201221 #04:11:05Z source: RADB last-modified: 2023-11-13T16:03:09Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.47.0.0/16 descr: proxy for HANARO TELECOM route origin: AS9488 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.47.0.0/16 descr: contact noc [at] bora.net if necessary origin: AS9488 mnt-by: MAINT-AS3786 changed: yuncheol [at] bora.net 20030808 source: RADB last-modified: 2023-11-13T16:09:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.47.0.0/19 origin: AS9488 descr: SNU-AS-KR mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20190902 #12:40:41Z source: RADB last-modified: 2023-11-13T15:57:08Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.47.6.0/24 descr: SNU-AS-KR origin: AS9488 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20201018 #12:43:18Z source: RADB last-modified: 2023-11-13T16:02:39Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 147.47.32.0/19 descr: SNU-AS-KR origin: AS9488 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20201018 #12:43:18Z source: RADB last-modified: 2023-11-13T16:02:39Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.97.141.0/24 descr: Proxy-Registered Route Object by LG Dacom(AS3786) origin: AS9488 remarks: This route object is for a LG Dacom's customer route remarks: which is being exported under this origin AS. remarks: remarks: This route object was automatically created to prevent remarks: some LG Dacom peer from rejecting this route because remarks: they may create their filter based on Route Registry DB. notify: noc [at] bora.net mnt-by: MAINT-AS3786 changed: yuncheol [at] bora.net 20061012 source: RADB last-modified: 2023-11-13T16:09:27Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.97.141.0/24 descr: proxy for HANARO TELECOM route origin: AS9488 mnt-by: MAINT-HANARO changed: ce-support [at] us.ntt.net 20080504 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source