These entries are queried from radb.net using whois, you can try my project getting these.
:AS19982 route: 74.212.160.0/21 descr: Towerstream Corp origin: AS19982 remarks: TOWERSTREAM NON PORTABLE IP notify: clane [at] towerstream.com mnt-by: TWER-MNT changed: clane [at] towerstream.com 20080625 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source