Netmask
#
of hosts
|
netmask
|
wildcard
mask
|
256
|
255.255.255.0
|
0.0.0.255
|
128
|
255.255.255.128 |
0.0.0.127 |
64
|
255.255.255.192 |
0.0.0.63 |
32
|
255.255.255.224 |
0.0.0.31 |
16
|
255.255.255.240 |
0.0.0.15 |
8
|
255.255.255.248 |
0.0.0.7 |
4
|
255.255.255.252 |
0.0.0.3 |
1
|
255.255.255.255 |
0.0.0.0 |
0's
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
1's
|
#of
hosts (#subnets)
|
mask
|
A
|
B
|
C
|
8
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
256
|
0
|
/8
|
/16
|
/24
|
7
|
1
|
0
|
0
|
0
|
0
|
0
|
0
|
0 |
1
|
128 (2)
|
128 |
/9
|
/17
|
/25
|
6
|
1
|
1
|
0
|
0
|
0
|
0
|
0
|
0
|
2
|
64 (4)
|
192 |
/10
|
/18
|
/26
|
5
|
1
|
1
|
1
|
0
|
0
|
0
|
0
|
0
|
3
|
32 (8)
|
224 |
/11
|
/19
|
/28
|
4
|
1
|
1
|
1
|
1
|
0
|
0
|
0
|
0
|
4
|
16 (16)
|
240 |
/12
|
/20
|
/29
|
3
|
1
|
1
|
1
|
1
|
1
|
0
|
0
|
0
|
5
|
8 (32)
|
248 |
/13
|
/21
|
/30
|
2
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
0
|
6
|
4 (64)
|
252 |
/14
|
/22
|
/30
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
0
|
7
|
2
|
254 |
/15
|
/23
|
*
|
0
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
8
|
1
|
255
|
/16
|
/24
|
/32
|
256 - start
|
end
- /24
|
|
8 -start
|
end
- /29
|
|
4 - start
|
end
- /30
|
|
4 - start |
end
- /30 |
0
|
255
|
|
0
|
7
|
|
0
|
3
|
|
128
|
131
|
|
|
|
8
|
15
|
|
4
|
7
|
|
132
|
135
|
128 - start
|
end
- /25
|
|
16
|
23
|
|
8
|
11
|
|
136
|
139
|
0
|
127
|
|
24
|
31
|
|
12
|
15
|
|
140
|
143
|
128
|
255
|
|
32
|
39
|
|
16
|
19
|
|
144
|
147
|
|
|
|
40
|
47
|
|
20
|
23
|
|
148
|
151
|
64 - start
|
end
/26
|
|
48
|
55
|
|
24
|
27
|
|
152
|
155
|
0
|
63
|
|
56
|
63
|
|
28
|
31
|
|
156
|
159
|
64
|
127
|
|
64
|
71
|
|
32
|
25
|
|
160
|
163
|
128
|
191
|
|
72
|
79
|
|
36
|
39
|
|
164
|
167
|
192
|
255
|
|
80
|
87
|
|
40
|
43
|
|
168
|
171
|
|
|
|
88
|
95
|
|
44
|
47
|
|
172
|
175
|
32 - start
|
end
/27
|
|
96
|
103
|
|
48
|
51
|
|
176
|
179
|
0
|
31
|
|
104
|
111
|
|
52
|
55
|
|
180
|
183
|
32
|
63
|
|
112
|
119
|
|
56
|
59
|
|
184
|
187
|
64
|
95
|
|
120
|
127
|
|
60
|
63
|
|
188
|
191
|
96
|
127
|
|
128
|
135
|
|
64
|
67
|
|
192
|
195
|
128
|
159
|
|
136
|
143
|
|
68
|
71
|
|
196
|
199
|
160
|
191
|
|
144
|
151
|
|
72
|
75
|
|
200
|
203
|
192
|
223
|
|
152
|
159
|
|
76
|
79
|
|
204
|
207
|
224
|
255
|
|
160
|
167
|
|
80
|
83
|
|
208
|
211
|
|
|
|
168
|
175
|
|
84
|
87
|
|
212
|
215
|
16 - start
|
end
- /28
|
|
176
|
183
|
|
88
|
91
|
|
216
|
219
|
0
|
15
|
|
184
|
191
|
|
92
|
95
|
|
220
|
223
|
16
|
31
|
|
192
|
199
|
|
96
|
99
|
|
224
|
227
|
32
|
47
|
|
200
|
207
|
|
100
|
103
|
|
228
|
231
|
48
|
63
|
|
208
|
215
|
|
104
|
107
|
|
232
|
235
|
64
|
79
|
|
216
|
223
|
|
108
|
111
|
|
236
|
239
|
80
|
95
|
|
224
|
231
|
|
112
|
115
|
|
240
|
243
|
96
|
111
|
|
232
|
239
|
|
116
|
119
|
|
244
|
247
|
112
|
127
|
|
240
|
247
|
|
120
|
123
|
|
248
|
252
|
128
|
143
|
|
248
|
255
|
|
124
|
127
|
|
252
|
255
|
144
|
159
|
|
|
|
|
|
|
|
|
|
160
|
175
|
|
|
|
|
|
|
|
|
|
176
|
191
|
|
|
|
|
|
|
|
|
|
192
|
207
|
|
|
|
|
|
|
|
|
|
208
|
223
|
|
|
|
|
|
|
|
|
|
224
|
239
|
|
|
|
|
|
|
|
|
|
240
|
255
|
|
|
|
|
|
|
|
|
|
|
