These entries are queried from radb.net using whois, you can try my project getting these.
:AS33742 route: 72.28.97.0/24 descr: The Telx Group - San Francisco origin: AS33742 member-of: RS-TELX-SFO mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20110919 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 72.28.103.0/24 descr: The Telx Group - San Francisco origin: AS33742 member-of: RS-TELX-SFO mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20120518 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.24.62.0/24 descr: The Telx Group -- San Francisco origin: AS33742 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20130823 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.35.53.0/24 descr: The Telx Group -- San Francisco origin: AS33742 member-of: RS-TELX-SFO mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20121113 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.35.57.0/24 descr: The Telx Group - San Francisco origin: AS33742 member-of: RS-TELX-SFO mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20121220 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.65.109.0/24 descr: The Telx Group - San Francisco origin: AS33742 mnt-by: MAINT-TELX changed: ipadmin [at] telx.com 20110731 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source