What is 1 2 4 8 16 32 64?

1) It is an example of exponential growth.

2) 128 64 32 16 8 4 2 1, is used by networkers to find IP address classes and custom subnet masks.

IP address classes A-E

128 64 32 16 8 4 2 1

A 0 0 0 0 0 0 0 0 = 0 through 127 (0+0+0+0+0+0+0+0=0)

B 1 0 0 0 0 0 0 0 = 128 through 191 (128+0+0+0+0+0+0+0=128)

C 1 1 0 0 0 0 0 0 = 192 through 223 (128+64+0+0+0+0+0+0=192)

D 1 1 1 0 0 0 0 0 = 224 through 239 (128+64+32+0+0+0+0+0=224)

E 1 1 1 1 0 0 0 0 = 240 through 255 (128+64+32+16+0+0+0+0=240)