Subnet Mask Information

The following figures may be useful in filling in a IPv4 Address Space Request Form

addrs bits pref   mask

1   0  /32    255.255.255.255
2   1  /31    255.255.255.254
4   2  /30    255.255.255.252
8   3  /29    255.255.255.248
16   4  /28    255.255.255.240
32   5  /27    255.255.255.224
64   6  /26    255.255.255.192
128   7  /25    255.255.255.128
256   8  /24    255.255.255
512   9  /23    255.255.254
1 K  10  /22    255.255.252
2 K  11  /21    255.255.248
4 K  12  /20    255.255.240
8 K  13  /19    255.255.224
16 K  14  /18    255.255.192
32 K  15  /17    255.255.128
64 K  16  /16    255.255
128 K  17  /15    255.254
256 K  18  /14    255.252
512 K  19  /13    255.248
1 M  20  /12    255.240
2 M  21  /11    255.224
4 M  22  /10    255.192
8 M  23  /9     255.128
16 M  24  /8     255
32 M  25  /7     254
64 M  26  /6     252
128 M  27  /5     248
256 M  28  /4     240
512 M  29  /3     224
1024 M  30  /2     192

hosts   subn/c  subn/c  subn/b  subn/b  bits hex-mask dec-mask
strict                   strict

2     64      62    16384   16382     2  fffffffc 255.255.255.252
6     32      30     8192    8190     3  fffffff8 255.255.255.248
14     16      14     4096    4094     4  fffffff0 255.255.255.240
30      8       6     2048    2046     5  ffffffe0 255.255.255.224
62      4       2     1024    1022     6  ffffffc0 255.255.255.192
126      2       0      512     510     7  ffffff80 255.255.255.128
254                     256     254     8  ffffff00 255.255.255.0
510                     128     126     9  fffffe00 255.255.254.0
1022                      64      62    10  fffffc00 255.255.252.0
2046                      32      30    11  fffff800 255.255.248.0
4094                      16      14    12  fffff000 255.255.240.0
8190                       8       6    13  ffffe000 255.255.224.0
16382                       4       2    14  ffffc000 255.255.192.0
32766                       2       0    15  ffff8000 255.255.128.0

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Posted on April 28, 2011, in General, Uncategorized, Windows. Bookmark the permalink. Leave a comment.

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