В настоящее время написано множество утилит, которые сделают все расчеты за вас.
Cisco Mask Max
Network Mask Wildcard Bits Hosts Nets SubnetBitMap
--------------- --------- ---- ------ ---- -----------------------------------
255.255.255.255 0.0.0.0 /32 1 10nnnnnn.nnnnnnnn.ssssssss.ssssssss
255.255.255.254 0.0.0.1 /31 10nnnnnn.nnnnnnnn.ssssssss.sssssssh
255.255.255.252 0.0.0.3 /30 4 10nnnnnn.nnnnnnnn.ssssssss.sssssshh
255.255.255.248 0.0.0.7 /29 8 10nnnnnn.nnnnnnnn.ssssssss.ssssshhh
255.255.255.240 0.0.0.15 /28 16 10nnnnnn.nnnnnnnn.ssssssss.sssshhhh
255.255.255.224 0.0.0.31 /27 32 10nnnnnn.nnnnnnnn.ssssssss.ssshhhhh
255.255.255.192 0.0.0.63 /26 64 10nnnnnn.nnnnnnnn.ssssssss.sshhhhhh
255.255.255.128 0.0.0.127 /25 128 10nnnnnn.nnnnnnnn.ssssssss.shhhhhhh
255.255.255.0 0.0.0.255 /24 256 1 10nnnnnn.nnnnnnnn.ssssssss.hhhhhhhh
255.255.254.0 0.0.1.255 /23 512 2 10nnnnnn.nnnnnnnn.sssssssh.hhhhhhhh
255.255.252.0 0.0.3.255 /22 1024 4 10nnnnnn.nnnnnnnn.sssssshh.hhhhhhhh
255.255.248.0 0.0.7.255 /21 2048 8 10nnnnnn.nnnnnnnn.ssssshhh.hhhhhhhh
255.255.240.0 0.0.15.255 /20 4096 16 10nnnnnn.nnnnnnnn.sssshhhh.hhhhhhhh
255.255.224.0 0.0.31.255 /19 8192 32 10nnnnnn.nnnnnnnn.ssshhhhh.hhhhhhhh
255.255.192.0 0.0.63.255 /18 16384 64 10nnnnnn.nnnnnnnn.sshhhhhh.hhhhhhhh
255.255.128.0 0.0.127.255 /17 32768 128 10nnnnnn.nnnnnnnn.shhhhhhh.hhhhhhhh
255.255.0.0 0.0.255.255 /16 65536 256 (n=network;s=subnet;h=host)
255.254.0.0 0.1.255.255 /15 512
255.252.0.0 0.3.255.255 /14 1024
255.248.0.0 0.7.255.255 /13 2048
255.240.0.0 0.15.255.255 /12 4096
255.224.0.0 0.31.255.255 /11 8192
255.192.0.0 0.63.255.255 /10 16384
255.128.0.0 0.127.255.255 /9 32768
255.0.0.0 0.255.255.255 /8 65536
254.0.0.0 1.255.255.255 /7
252.0.0.0 3.255.255.255 /6
248.0.0.0 7.255.255.255 /5
240.0.0.0 15.255.255.255 /4
224.0.0.0 31.255.255.255 /3
192.0.0.0 63.255.255.255 /2
128.0.0.0 127.255.255.255 /1
0.0.0.0 255.255.255.255 /0
Mask IP Address Ranges
--------------- ---------------------------------------------------
255.255.255.252 0-3, 4-7, 8-11, 12-15, 16-19, 20-23, 24-27,
28-31, 32-35, 36-39, 40-43, 44-47, 48-51,
52-55, 56-59, 60-63, 64-67, 68-71, 72-75,
76-79, 80-83, 84-87, 88-92, 92-95, 96-99,
100-103, 104-107, 108-111, 112-115, 116-119,
120-123, 124-127, 128-131, 132-135, 136-139,
140-143, 144-147, 148-151, 152-155, 156-159,
160-163, 164-167, 167-171, 172-175, 176-179,
180-183, 184-187, 188-191, 192-195, 196-199,
200-203, 203-207, 208-211, 212-215, 216-219,
220-223, 224-227, 228-231, 232-235, 236-239,
240-243, 244-247, 248-251, 251-255
255.255.255.248 0-7, 8-15, 16-23, 24-31, 32-39, 40-47, 48-55,
56-63, 64-71, 72-79, 80-87, 88-95, 96-103,
104-111, 112-119, 120-127, 128-135, 136-143,
144-151, 152-159, 160-167, 168-175, 176-183,
184-191, 192-199, 200-207, 208-215, 216-223,
224-231, 232-239, 240-247, 248-255
255.255.255.240 0-15, 16-31, 32-47, 48-63, 64-79, 80-95,
96-111, 112-127, 128-143, 144-159, 160-175,
176-191, 192-207, 208-223, 224-239, 240-255
255.255.255.224 0-31, 32-63, 64-95, 96-127, 128-159,
160-191, 192-223, 224-255
255.255.255.192 0-63, 64-127, 128-191, 192-256
255.255.255.128 0-127, 128-255
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