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Cheatography

Masks

1st
2nd
3rd
4th
/1
/9
/17
/25
/2
/10
/18
/26
/3
/11
/19
/27
/4
/12
/20
/28
/5
/13
/21
/29
/6
/14
/22
/30
/7
/15
/23
/31
/8
/16
/24
/32

Example

 
1st
2nd
3rd
Address
165
245
12
Mask
255
255
255
Network
165
245
12
Broadcast
165
245
12
First IP
165
245
12
Last IP
165
245
12
Subnet 165.24­5.1­2.88/26
 

Mask Cont.

Subnet Mask
Networks
Addresses
128
2
128
192
4
64
224
8
32
240
16
16
248
32
8
252
64
4
254
128
2
255
256
1

Example Cont.

4th
88
192
64
127
65
126
 

Powers of 2

2^1
2
2^10
1,024
2^2
4
2^11
2,048
2^3
8
2^12
4,096
2^4
16
2^13
8,192
2^5
32
2^14
16,384
2^6
64
2^15
32,768
2^7
128
2^16
65,536
2^8
256
2^17
131,072
2^9
512
2^18
262,144
 

Multiples of 8

0
64
128
192
8
72
136
200
16
80
144
208
24
88
152
216
32
96
160
224
40
104
168
232
48
112
176
240
56
120
184
248
64
128
192
256

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