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Subnetting Chart

CIDR Block Supernet Mask Number of /24
(Class C) Networks		 Number of Hosts
/8 255.0.0.0 65,536 16,777,214
/9 255.128.0.0 32,768 8,388,606
/10 255.192.0.0 16,384 4,193,302
/11 255.224.0.0 8,192 2,097,150
/12 255.240.0.0 4,096 1,048,574
/13 255.248.0.0 2,048 524,286
/14 255.252.0.0 1,024 262,142
/15 255.254.0.0 512 131,070
/16 255.255.0.0 256 65,534
/17 255.255.128.0 128 32,766
/18 255.255.192.0 64 16,382
/19 255.255.224.0 32 8,190
/20 255.255.240.0 16 4,094
/21 255.255.248.0 8 2,046
/22 255.255.252.0 4 1,022
/23 255.255.254.0 2 510
/24 255.255.255.0 1 252
/25 255.255.255.128 1/2 126
/26 255.255.255.192 1/4 62
/27 255.255.255.224 1/8 30
/28 255.255.255.240 1/16 14
/29 255.255.255.248 1/32 6
/30 255.255.255.252 1/64
 2

/25 128
0,1-126,127
128,129-254,255

/26 192
0,1-62,63
64,65-126,127
128,129-190,191
192,193-254,255

/27 224
0,1-30,31
32,33-62,63
64,65-94,95
96,97-126,127
128,129-158,159
160,161-190,191
192,193-222,223
224,225-254,255

/28 240
0,1-14,15
16,17-30,31
32,33-46,47
48,49-62,63
64,65-78,79
80,81-94,95
96,97-110,111
112,113-126,127
128,129-142,143
144,145-158,159
160,161-174,175
176,177-190,191
192,193-206,207
208,209-222,223
224,225-238,239
240,241-254,255

/29 248
0,1-6,7
8,9-14,15
16,17-22,23
24,25-30,31
32,33-38,39
40,41-46,47
48,49-54,55
56,57-62,63
64,65-70,71
72,73-78,79
80,81-86,87
88,89-94,95
96,97-102,103
104,105-110,111
112,113-118,119
120,121-126,127
128,129-134,135
136,137-142,143
144,145-150,151
152,153-158,159
160,161-166,167
168,169-174,175
176,177-182,183
184,185-190,191
192,193-198,199
200,201-206,207
208,209-214,215
216,217-222,223
224,225-230,231
232,233-238,239
240,241-246,247
248,249-254,255
 /30 252
0,1-2,3
4,5-6,7
8,9-10,11
12,13-14,15
16,17-18,19
20,21-22,23
24,25-26,27
28,29-30,31
32,33-34,35
36,37-38,39
40,41-42,43
44,45-46,47
48,49-50,51
52,53-54,55
56,57-58,59
60,61-62,63
64,65-66,67
68,69-70,71
72,73-74,75
76,77-78,79
80,81-82,83
84,85-86,87
88,89-90,91
92,93-94,95
96,97-98,99
100,101-102,103
104,105-106,107
108,109-110,111
112,113-114,115
116,117-118,119
120,121-122,123
124,125-126,127
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
172,173-174,175
176,177-178,179
180,181-182,183
184,185-186,187
188,189-190,191
192,193-194,195
196,197-198,199
200,201-202,203
204,205-206,207
208,209-210,211
212,213-214,215
216,217-218,219
220,221-222,223
224,225-226,227
228,229-230,231
232,233-234,235
236,237-238,239
240,241-242,243
244,245-246,247
248,249-250,251
252,253-254,255