Advertised prefixes smaller than registry allocations (per /8 block)
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   4:1        57:3        61:5        64:93       66:213      67:99     
  68:204      69:62      165:11      195:2       203:1       208:1      
 209:11      210:2       211:1       212:2       213:2       216:23     
 218:1       219:16      220:3      
