IPv4_Subnetting.pdf

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IP V 4 S UBNETTING
packetlife.net
Subnets
Decimal to Binary
CIDR
/32 255.255.255.255 1
Subnet Mask
Addresses
Wildcard
0.0.0.0
Subnet Mask
Wildcard
255 1111 1111
0 0000 0000
/31 255.255.255.254 2
0.0.0.1
254 1111 1110
1 0000 0001
/30 255.255.255.252 4
0.0.0.3
252 1111 1100
3 0000 0011
/29 255.255.255.248 8
0.0.0.7
248 1111 1000
7 0000 0111
/28 255.255.255.240 16
0.0.0.15
240 1111 0000
15 0000 1111
/27 255.255.255.224 32
0.0.0.31
224 1110 0000
31 0001 1111
/26 255.255.255.192 64
0.0.0.63
192 1100 0000
63 0011 1111
/25 255.255.255.128 128
0.0.0.127
128 1000 0000
127 0111 1111
/24 255.255.255.0
256
0.0.0.255
0 0000 0000
255 1111 1111
/23 255.255.254.0
512
0.0.1.255
Subnet Proportion
/22 255.255.252.0
1,024
0.0.3.255
/21 255.255.248.0
2,048
0.0.7.255
/20 255.255.240.0
4,096
0.0.15.255
/27
/19 255.255.224.0
8,192
0.0.31.255
/28
/26
/29
/30
/18 255.255.192.0
16,384
0.0.63.255
/17 255.255.128.0
32,768
0.0.127.255
/30
/16 255.255.0.0
65,536
0.0.255.255
/15 255.254.0.0
131,072
0.1.255.255
/14 255.252.0.0
262,144
0.3.255.255
/25
/13 255.248.0.0
524,288
0.7.255.255
/12 255.240.0.0
1,048,576
0.15.255.255
/11 255.224.0.0
2,097,152
0.31.255.255
Classful Ranges
/10 255.192.0.0
4,194,304
0.63.255.255
A 0.0.0.0 Î 127.255.255.255
/9 255.128.0.0
8,388,608
0.127.255.255
B 128.0.0.0 - 191.255.255.255
/8 255.0.0.0
16,777,216
0.255.255.255
C 192.0.0.0 - 223.255.255.255
/7 254.0.0.0
33,554,432
1.255.255.255
D 224.0.0.0 - 239.255.255.255
/6 252.0.0.0
67,108,864
3.255.255.255
E 240.0.0.0 - 255.255.255.255
/5 248.0.0.0
134,217,728
7.255.255.255
/4 240.0.0.0
268,435,456
15.255.255.255
Reserved Ranges
/3 224.0.0.0
536,870,912
31.255.255.255
RFC 1918 10.0.0.0 - 10.255.255.255
/2 192.0.0.0
1,073,741,824 63.255.255.255
Localhost 127.0.0.0 - 127.255.255.255
/1 128.0.0.0
2,147,483,648 127.255.255.255
RFC 1918 172.16.0.0 - 172.31.255.255
/0 0.0.0.0
4,294,967,296 255.255.255.255
RFC 1918 192.168.0.0 - 192.168.255.255
Terminology
CIDR
Classless interdomain routing was developed to
provide more granularity than legacy classful
addressing; CIDR notation is expressed as /XX
VLSM
Variable-length subnet masks are an arbitrary length
between 0 and 32 bits; CIDR relies on VLSMs to define
routes
by Jeremy Stretch
v2.0
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