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Subnetting Cheat Sheet

IPv4 SUBNETTING AND SPECIAL IP ADDRESSES

In this Subnetting Cheat Sheet Page, you will find all the possible CIDR, Subnet Mask, Wildcard Mask values for IPv4 Addresses. Beside, you will find private IP addresses, special IP addresses and bogon IP addresses. You can use this subnet cheat sheet online or you can Download Subnetting Cheat Sheet as a pdf file.

subnettin-cheat-sheet

 

CIDR | Subnet | Addresses | Wildcard

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

To determine the 8 bits Octet value, add 0s in front of the binary value. For example: For Decimal 5, the Binary value is 101. 8 bits value is 00000101.

 

Subnetting Mask Cheat Sheet

 

In this Subnetting cheat sheet page, you can view all you need about subnetting! You can view CIDR values that is the equivalent valueof your subnet mask, address numbers that can be used with this subnet mask and wildcard masks. You can learn Classful IP Addresses, IPv4 address classes, Private IPv4 blocks. Beside, you can check special IPv4 addresses like Local addresses and APIPA in this Subnetting cheat sheet. The other important thing you will find in this  Subnet mask cheat sheet is Bogon IP Addresses. The decimal to binary table will also help you for your Subnet Calculations.

 

Subnetting is one of the most important and confusing lesson of computer networking. Almost all network engineers, network technicians and network administrators have had difficulties on this lesson. So, always an easy way is tried to be found to determine the correct subnetting mask. To overcome this confusing, I have prepared a perfect Subnetting cheat sheet for you. With this two pages subnetting document, you can easily determine your subnet masks anymore.

 

So, how can you use this Subnetting cheat sheet? First of all, you can use this sheet whenever you forgot any Subnet mask value or even if you need to determine a Subnet Mask for your network. If you do a good calculation, then you do not waste you IPv4 blocks. So, to use your IPv4 blocks effectively, this sheet will help you a lot! You can find the required value and then you can use the corresponding subnet mask in this sheet. It will show you not only the CIDR (Classless Interdomain Routing) value, but also the host addresses and Wildcard Masks.

 

With this Subnet mask cheat sheet, you do not need to use Subnetting Calculator anymore. You can check the network and host values and you can deteremine that which Subnet is useful for you. Without this sheet, you have to use Subnetting Calculator to determine the Subnetting mask, that you will use on your network.

 

You can download this Subnetting cheat sheet  in pdf format. With this Subnetting cheat sheet pdf, you can use this important adn effective document anywhere offline. So, do not forget to download it and keep near with you during your network activities.

Subnetting Practice

 

Subnetting performance can be improved with more Subnetting practices. So, to do this, you should solve different types of Subnetting questions. With this subnetting questions and answers, you see different types of questions and you become ready to the real World subnetting calculations.

For your Subnetting Practice, this Subnet mask cheat sheet will help you a lot. Beside, for your subnetting practice, there is a great page on IPcisco.com. This is Subnetting Practice Page..!

In Subnetting Practice Page, you can find a lot of Subnetting questions and subnetting scenarios about real world. By solving these Subnetting questions, you will be perfect on this important network lesson!

 

Subnetting Lessons

 

If you do not feel comportable about Subnetting, you can learn it easily on Subnetting Lesson of IPCisco.com. Subnetting lesson is in CCNA Course and it teaches you this key lesson with different Subnetting Examples in a short time.

 

Subnetting Video

 

You can also view Subnetting Video for extra Subnetting Examples on Youtube. There is a good subnetting lesson on Youtube that is prepared with Cisco Paket Tracer. With this examples, you can practice subnetting on Youtube also.

 

 

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