These entries are queried from radb.net using whois, you can try my project getting these.
:AS18817 route: 216.12.176.0/20 origin: AS18817 descr: 3901 N Louise Ave Sioux Falls SD 57107 United States admin-c: MBO122-ARIN tech-c: IPADM903-ARIN mnt-by: MNT-MIDCO-1 created: 2021-11-05T17:38:16Z last-modified: 2021-11-05T17:38:16Z source: ARIN rpki-ov-state: valid