These entries are queried from radb.net using whois, you can try my project getting these.
:AS27398 route: 74.123.136.0/22 origin: AS27398 descr: Alyeska Information Technology Services LLC mnt-by: MAINT-AS8047 changed: bkovacevic [at] gci.com 20220414 #22:49:38Z source: RADB last-modified: 2023-11-13T16:10:51Z rpki-ov-state: valid route: 74.123.136.0/22 origin: AS27398 descr: Alyeska Information Technology Services LLC North America admin-c: MANTZ2-ARIN tech-c: MANTZ2-ARIN mnt-by: MNT-AITSL created: 2022-04-09T17:08:49Z last-modified: 2022-04-09T17:08:49Z source: ARIN rpki-ov-state: valid route: 162.218.248.0/22 origin: AS27398 descr: MNT-AITSL route 162.218.248.000/22 AS27398 admin-c: MANTZ2-ARIN tech-c: MANTZ2-ARIN mnt-by: MNT-AITSL created: 2020-08-04T08:05:27Z last-modified: 2023-08-07T16:10:35Z source: ARIN rpki-ov-state: valid route: 162.218.248.0/22 descr: Alyeska Information Technology Services LLC origin: AS27398 mnt-by: MAINT-AS17378 changed: romeo.czumbil [at] tierpoint.com 20170517 #01:58:38Z source: RADB last-modified: 2023-11-13T16:17:09Z rpki-ov-state: valid route: 162.218.250.0/24 origin: AS27398 descr: Alyeska Information Technology Services LLC mnt-by: MAINT-AS11404 changed: chris.oyler [at] astound.com 20240129 # 1151Z source: RADB last-modified: 2024-01-29T11:51:37Z rpki-ov-state: valid route: 162.218.251.0/24 origin: AS27398 descr: Alyeska Information Technology Services LLC mnt-by: MAINT-AS11404 changed: chris.oyler [at] astound.com 20240129 # 1152Z source: RADB last-modified: 2024-01-29T11:52:16Z rpki-ov-state: valid route: 206.81.160.0/22 origin: AS27398 descr: Alyeska Information Technology Services LLC mnt-by: MAINT-AS17378 changed: romeo.czumbil [at] tierpoint.com 20200608 #14:00:10Z source: RADB last-modified: 2023-11-13T16:17:10Z rpki-ov-state: valid route: 206.81.160.0/22 origin: AS27398 mnt-by: MNT-AITSL tech-c: MANTZ2-ARIN admin-c: MANTZ2-ARIN source: ARIN created: 2020-08-04T08:04:44Z last-modified: 2020-08-04T08:04:44Z descr: MNT-AITSL route 206.081.160.000/22 AS27398 rpki-ov-state: valid route: 206.81.160.0/23 origin: AS27398 descr: Alyeska Information Technology Services LLC mnt-by: MAINT-AS11404 changed: chris.oyler [at] astound.com 20240129 # 1201Z source: RADB last-modified: 2024-01-29T12:01:15Z rpki-ov-state: valid route: 206.81.162.0/23 origin: AS27398 descr: Alyeska Information Technology Services LLC mnt-by: MAINT-AS11404 changed: chris.oyler [at] astound.com 20240129 # 1202Z source: RADB last-modified: 2024-01-29T12:02:15Z rpki-ov-state: valid route6: 2602:fed5::/36 origin: AS27398 mnt-by: MNT-AITSL tech-c: MANTZ2-ARIN admin-c: MANTZ2-ARIN source: ARIN created: 2020-08-04T08:11:25Z last-modified: 2020-08-04T08:11:25Z descr: MNT-AITSL route 2602:FED5:0000:0000:0000:0000:0000:0000/36 AS27398 rpki-ov-state: valid route6: 2602:fed5::/36 descr: Alyeska Information Technology Services LLC origin: AS27398 mnt-by: MAINT-AS17378 changed: romeo.czumbil [at] tierpoint.com 20170703 #14:21:29Z source: RADB last-modified: 2023-11-13T16:17:09Z rpki-ov-state: valid route6: 2602:fed5:800::/37 origin: AS27398 descr: Nusthel notify: CoreNSAcore [at] gci.com mnt-by: MAINT-AS8047 changed: bkovacevic [at] gci.com 20200731 #01:22:46Z source: RADB last-modified: 2023-11-13T16:01:17Z rpki-ov-state: valid