IP Network Numbers - Class B

Class B networks (128.0.x.x to 191.255.x.x) have a 16-bit network prefix with a 16-bit host number, and are also referred to as /16 networks.

The first two bits of the prefix are set to 10, hence there are 2¹⁴ (16384) possible Class B networks; currently around 12000 are defined (65%).

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This information was updated September 2000.

[128], [129], [130], [131], [132], [133], [134], [135], [136], [137], [138], [139], [140], [141], [142], [143], [144], [145], [146], [147], [148], [149], [150], [151], [152], [153], [154], [155], [156], [157], [158], [159], [160], [161], [162], [163], [164], [165], [166], [167], [168], [169], [170], [171], [172]

173 - 191 Not yet used.

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