In browsing the encap file I see entries that aren't defined as regional networks:
ex: 44.71.28.0/27 44.71.4.0/27 44.71.4.32/27 44.72.26.0/24 44.72.73.0/26
https://portal.ampr.org/networks.php?a=region&id=162
The listed regional networks skip from 44.70 to 44.74 44.70.0.0/16 Ohio 44.74.0.0/16 North Carolina