CIDR |
SUBNET MASK | ADDRESSES | WILDCARD |
| /32 | 255.255.255.255 | 1 | 0.0.0.0 |
| /31 | 255.255.255.254 | 2 | 0.0.0.1 |
| /30 | 255.255.255.252 | 4 | 0.0.0.3 |
| /29 | 255.255.255.248 | 8 | 0.0.0.7 |
| /28 | 255.255.255.240 | 16 | 0.0.0.15 |
| /27 | 255.255.255.224 | 32 | 0.0.0.31 |
| /26 | 255.255.255.192 | 64 | 0.0.0.63 |
| /25 | 255.255.255.128 | 128 | 0.0.0.127 |
| /24 | 255.255.255.0 | 256 | 0.0.0.255 |
| /23 | 255.255.254.0 | 512 | 0.0.1.255 |
| /22 | 255.255.252.0 | 1024 | 0.0.3.255 |
| /21 | 255.255.248.0 | 2048 | 0.0.7.255 |
| /20 | 255.255.240.0 | 4096 | 0.0.15.255 |
| /19 | 255.255.224.0 | 8192 | 0.0.31.255 |
| /18 | 255.255.192.0 | 16384 | 0.0.63.255 |
| /17 | 255.255.128.0 | 32768 | 0.0.127.255 |
| /16 | 255.255.0.0 | 65536 | 0.0.255.255 |
| /15 | 255.254.0.0 | 131072 | 0.1.255.255 |
| /14 | 255.252.0.0 | 262144 | 0.3.255.255 |
| /13 | 255.248.0.0 | 524288 | 0.7.255.255 |
| /12 | 255.240.0.0 | 1048576 | 0.15.255.255 |
| /11 | 255.224.0.0 | 2097152 | 0.31.255.255 |
| /10 | 255.192.0.0 | 4194304 | 0.63.255.255 |
| /9 | 255.128.0.0 | 8388608 | 0.127.255.255 |
| /8 | 255.0.0.0 | 16777216 | 0.255.255.255 |
| /7 | 254.0.0.0 | 33554432 | 1.255.255.255 |
| /6 | 252.0.0.0 | 67108864 | 3.255.255.255 |
| /5 | 248.0.0.0 | 134217728 | 7.255.255.255 |
| /4 | 240.0.0.0 | 268435456 | 15.255.255.255 |
| /3 | 224.0.0.0 | 536870912 | 31.255.255.255 |
| /2 | 192.0.0.0 | 1073741824 | 63.255.255.255 |
| /1 | 128.0.0.0 | 2147483648 | 127.255.255.255 |
| /0 | 0.0.0.0 | 4294967296 | 255.255.255.255 |
Classful IPv4 Addresses
| Class A | 0.0.0.0 – 127.255.255.255 |
| Class B | 128.0.0.0 – 191.255.255.255 |
| Class C | 192.0.0.0 – 223.255.255.255 |
| Class D | 224.0.0.0 – 239.255.255.255 |
| Class E | 240.0.0.0 – 254.255.255.254 |
Private IPv4 Addresses
| Class A | 10.0.0.0 – 10.255.255.255 |
| Class B | 172.16.0.0 – 172.31.255.255 |
| Class C | 192.168.0.0 – 192.168.255.255 |
Special IPv4 Addresses
| Local Host | 127.0.0.0 – 127.255.255.255 |
| APIPA | 169.254.0.0 – 169.254.255.255 |
Bogon IPv4 Addresses
| 0.0.0.0/8 | This network |
| 10.0.0.0/8 | Private IPv4 Block |
| 100.64.0.0/10 | Carrier-grade NAT |
| 127.0.0.0/8 | Loopback |
| 127.0.53.53 | Name collision occurance |
| 169.254.0.0/16 | Link local |
| 172.16.0.0/12 | Private IPv4 Block |
| 192.0.0.0/24 | IETF Assignments |
| 192.0.2.0/24 | TEST-NET-1 |
| 192.168.0.0/16 | Private IPv4 Block |
| 198.18.0.0/15 | Benchmark testing |
| 198.51.100.0/24 | TEST-NET-2 |
| 203.0.113.0/24 | TEST-NET-3 |
| 224.0.0.0/4 | Multicast |
| 240.0.0.0/4 | Reserved |
| 255.255.255.255/32 | Limited broadcast |
Decimal to Binary Table
| DEC | BIN | DEC | BIN | DEC | BIN | DEC | BIN | DEC | BIN | DEC | BIN | DEC | BIN | DEC | BIN |
| 1 | 1 | 33 | 100001 | 65 | 1000001 | 97 | 1100001 | 129 | 10000001 | 161 | 10100001 | 193 | 11000001 | 225 | 11100001 |
| 2 | 10 | 34 | 100010 | 66 | 1000010 | 98 | 1100010 | 130 | 10000010 | 162 | 10100010 | 194 | 11000010 | 226 | 11100010 |
| 3 | 11 | 35 | 100011 | 67 | 1000011 | 99 | 1100011 | 131 | 10000011 | 163 | 10100011 | 195 | 11000011 | 227 | 11100011 |
| 4 | 100 | 36 | 100100 | 68 | 1000100 | 100 | 1100100 | 132 | 10000100 | 164 | 10100100 | 196 | 11000100 | 228 | 11100100 |
| 5 | 101 | 37 | 100101 | 69 | 1000101 | 101 | 1100101 | 133 | 10000101 | 165 | 10100101 | 197 | 11000101 | 229 | 11100101 |
| 6 | 110 | 38 | 100110 | 70 | 1000110 | 102 | 1100110 | 134 | 10000110 | 166 | 10100110 | 198 | 11000110 | 230 | 11100110 |
| 7 | 111 | 39 | 100111 | 71 | 1000111 | 103 | 1100111 | 135 | 10000111 | 167 | 10100111 | 199 | 11000111 | 231 | 11100111 |
| 8 | 1000 | 40 | 101000 | 72 | 1001000 | 104 | 1101000 | 136 | 10001000 | 168 | 10101000 | 200 | 11001000 | 232 | 11101000 |
| 9 | 1001 | 41 | 101001 | 73 | 1001001 | 105 | 1101001 | 137 | 10001001 | 169 | 10101001 | 201 | 11001001 | 233 | 11101001 |
| 10 | 1010 | 42 | 101010 | 74 | 1001010 | 106 | 1101010 | 138 | 10001010 | 170 | 10101010 | 202 | 11001010 | 234 | 11101010 |
| 11 | 1011 | 43 | 101011 | 75 | 1001011 | 107 | 1101011 | 139 | 10001011 | 171 | 10101011 | 203 | 11001011 | 235 | 11101011 |
| 12 | 1100 | 44 | 101100 | 76 | 1001100 | 108 | 1101100 | 140 | 10001100 | 172 | 10101100 | 204 | 11001100 | 236 | 11101100 |
| 13 | 1101 | 45 | 101101 | 77 | 1001101 | 109 | 1101101 | 141 | 10001101 | 173 | 10101101 | 205 | 11001101 | 237 | 11101101 |
| 14 | 1110 | 46 | 101110 | 78 | 1001110 | 110 | 1101110 | 142 | 10001110 | 174 | 10101110 | 206 | 11001110 | 238 | 11101110 |
| 15 | 1111 | 47 | 101111 | 79 | 1001111 | 111 | 1101111 | 143 | 10001111 | 175 | 10101111 | 207 | 11001111 | 239 | 11101111 |
| 16 | 10000 | 48 | 110000 | 80 | 1010000 | 112 | 1110000 | 144 | 10010000 | 176 | 10110000 | 208 | 11010000 | 240 | 11110000 |
| 17 | 10001 | 49 | 110001 | 81 | 1010001 | 113 | 1110001 | 145 | 10010001 | 177 | 10110001 | 209 | 11010001 | 241 | 11110001 |
| 18 | 10010 | 50 | 110010 | 82 | 1010010 | 114 | 1110010 | 146 | 10010010 | 178 | 10110010 | 210 | 11010010 | 242 | 11110010 |
| 19 | 10011 | 51 | 110011 | 83 | 1010011 | 115 | 1110011 | 147 | 10010011 | 179 | 10110011 | 211 | 11010011 | 243 | 11110011 |
| 20 | 10100 | 52 | 110100 | 84 | 1010100 | 116 | 1110100 | 148 | 10010100 | 180 | 10110100 | 212 | 11010100 | 244 | 11110100 |
| 21 | 10101 | 53 | 110101 | 85 | 1010101 | 117 | 1110101 | 149 | 10010101 | 181 | 10110101 | 213 | 11010101 | 245 | 11110101 |
| 22 | 10110 | 54 | 110110 | 86 | 1010110 | 118 | 1110110 | 150 | 10010110 | 182 | 10110110 | 214 | 11010110 | 246 | 11110110 |
| 23 | 10111 | 55 | 110111 | 87 | 1010111 | 119 | 1110111 | 151 | 10010111 | 183 | 10110111 | 215 | 11010111 | 247 | 11110111 |
| 24 | 11000 | 56 | 111000 | 88 | 1011000 | 120 | 1111000 | 152 | 10011000 | 184 | 10111000 | 216 | 11011000 | 248 | 11111000 |
| 25 | 11001 | 57 | 111001 | 89 | 1011001 | 121 | 1111001 | 153 | 10011001 | 185 | 10111001 | 217 | 11011001 | 249 | 11111001 |
| 26 | 11010 | 58 | 111010 | 90 | 1011010 | 122 | 1111010 | 154 | 10011010 | 186 | 10111010 | 218 | 11011010 | 250 | 11111010 |
| 27 | 11011 | 59 | 111011 | 91 | 1011011 | 123 | 1111011 | 155 | 10011011 | 187 | 10111011 | 219 | 11011011 | 251 | 11111011 |
| 28 | 11100 | 60 | 111100 | 92 | 1011100 | 124 | 1111100 | 156 | 10011100 | 188 | 10111100 | 220 | 11011100 | 252 | 11111100 |
| 29 | 11101 | 61 | 111101 | 93 | 1011101 | 125 | 1111101 | 157 | 10011101 | 189 | 10111101 | 221 | 11011101 | 253 | 11111101 |
| 30 | 11110 | 62 | 111110 | 94 | 1011110 | 126 | 1111110 | 158 | 10011110 | 190 | 10111110 | 222 | 11011110 | 254 | 11111110 |
| 31 | 11111 | 63 | 111111 | 95 | 1011111 | 127 | 1111111 | 159 | 10011111 | 191 | 10111111 | 223 | 11011111 | 255 | 11111111 |
| 32 | 100000 | 64 | 1000000 | 96 | 1100000 | 128 | 10000000 | 160 | 10100000 | 192 | 11000000 | 224 | 11100000 | 256 | 100000000 |
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