[['class', 'leading bits', 'size of network number bit field', 'size of rest bit field', 'number of networks', 'addresses per network', 'start address', 'end address'], ['class a', '0', '8', '24', '128 (2 7 )', '16777216 (2 24 )', '0.0.0.0', '127.255.255.255'], ['class b', '10', '16', '16', '16384 (2 14 )', '65536 (2 16 )', '128.0.0.0', '191.255.255.255'], ['class c', '110', '24', '8', '2097152 (2 21 )', '256 (2 8 )', '192.0.0.0', '223.255.255.255'], ['class d ( multicast )', '1110', 'not defined', 'not defined', 'not defined', 'not defined', '224.0.0.0', '239.255.255.255'], ['class e (reserved)', '1111', 'not defined', 'not defined', 'not defined', 'not defined', '240.0.0.0', '255.255.255.255']]
the End Address of all Classful Network End in 255
the [ENT] of all [ENT] [ENT] in 255