Subnet Range Cheat Sheet
1st Octet 1234567 8 12345678 12345678 12 3 4567 8
2nd Octet 910 11 12 13 14 15 16 910 11 12 13 14 15 16 910 11 12 13 14 15 16 910 11 12 13 14 15 16
3rd Octet 17 18 19 20 21 22 23 24 17 18 19 20 21 22 23 24 17 18 19 20 21 22 23 24 17 18 19 20 21 22 23 24
4th Octet 25 26 27 28 29 30 31 32 25 26 27 28 29 30 31 32 25 26 27 28 29 30 31 32 25 26 27 28 29 30 31 32
128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255 128 192 224 240 248 252 254 255
80 C0 E0 F0 F8 FC FE FF 80 C0 E0 F0 F8 FC FE FF 80 C0 E0 F0 F8 FC FE FF 80 C0 E0 F0 F8 FC FE FF
Net/Host # Net/Host # Net/Host # Net/Host #
064 128 192
165 129 193
266 130 194
367 131 195
468 132 196
569 133 197
670 134 198
771 135 199
872 136 200
973 137 201
10 74 138 202
11 75 139 203
12 76 140 204
13 77 141 205
14 78 142 206
15 79 143 207
16 80 144 208
17 81 145 209
18 82 146 210
19 83 147 211
20 84 148 212
21 85 149 213
22 86 150 214
23 87 151 215
24 88 152 216
25 89 153 217
26 90 154 218
27 91 155 219
28 92 156 220
29 93 157 221
30 94 158 222
31 95 159 223
32 96 160 224
33 97 161 225
34 98 162 226
35 99 163 227
36 100 164 228
37 101 165 229
38 102 166 230
39 103 167 231
40 104 168 232
41 105 169 233
42 106 170 234
43 107 171 235
44 108 172 236
45 109 173 237
46 110 174 238
47 111 175 239
48 112 176 240
49 113 177 241
50 114 178 242
51 115 179 243
52 116 180 244
53 117 181 245
54 118 182 246
55 119 183 247
56 120 184 248
57 121 185 249
58 122 186 250
59 123 187 251
60 124 188 252
61 125 189 253
62 126 190 254
63 127 191 255
Notes: The four column groupings represent host or network numbers from 0 through 255. Read top to bottom, left to right, like a newspaper.
Prefix length and equivalent decimal and hexadecimal notation is given at the top of each column. Example: /8, /16, /24 and /32 are equivalent to 255 or FF in the appropriate octet.
In a given column, if the shading in one row is the same as the shading in the next row, then the two addresses are part of the same subnet.
Special-Use IPv4 Addresses (RFC3330) Multicast address range: 224.0.0.0 -- 239.255.255.255 inclusive
0.0.0.0/8 "This" network (RFC1122) 224.0.0.0/4 Multicast
10.0.0.0/8 Private-Use network (RFC1918) 224.0.0.0/24 Multicast Link-local (not to be forwarded between subnets
127.0.0.0/8 Loopback (RFC1122) 232.0.0.0/8 SSM (reserved for Source-Specific Multicast)
169.254.0.0/16 Link Local (RFC3927) 239.0.0.0/8 ASM (Any Source Multicast)
172.16.0.0/12 Private-Use network (RFC1918)
192.0.0.0/24 Reserved for IETF protocol assignments (RFC5736) Private AS Numbers
192.0.2.0/24 "TEST-NET" documentation & examples (RFC5737) 65412 - 65535
192.88.99.0/24 6to4 Relay Anycast (RFC3068)
192.168.0.0/16 Private-Use network (RFC1918)
198.18.0.0/15 Benchmark Tests (RFC2544)
198.51.100.0/24 "TEST-NET-2" documentation and examples (RFC5737)
203.0.113.0/24 "TEST-NET-3" documentation and examples (RFC5737)
224.0.0.0/4 Multicast (RFC3171)
240.0.0.0/4 Reserved for future use (RFC1112)
Prefix Length
Prefix Length
Prefix Length
Prefix Length
Mask Notation
Mask Notation
Mask Notation
Mask Notation
Michael E Fox 12/29/2018 Page 1 of 1
