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Subnet mask cheat sheet
by admin
 at 2015-12-17 08:39:00.

An IPv4 network mask consists of 32 bits. The following example shows the separation of the network prefix and the host identifier from an address (192.168.5.130) and its associated /24 network mask (255.255.255.0).

 Binary formDot-decimal notation
IP address 11000000.10101000.00000101.10000010 192.168.5.130
Subnet mask 11111111.11111111.11111111.00000000 255.255.255.0
Network prefix 11000000.10101000.00000101.00000000 192.168.5.0
Host part 00000000.00000000.00000000.10000010 0.0.0.130
 
Class Address # of Hosts Netmask (Binary) Netmask (Decimal)
 
CIDR /4 240,435,456 11110000 00000000 00000000 00000000 240.0.0.0
 
CIDR /5 134,217,728 11111000 00000000 00000000 00000000 248.0.0.0
 
CIDR /6 67,108,864 11111100 00000000 00000000 00000000 252.0.0.0
 
CIDR /7 33,554,432 11111110 00000000 00000000 00000000 254.0.0.0
 
A /8 16,777,216 11111111 00000000 00000000 00000000 255.0.0.0
 
CIDR /9 8,388,608 11111111 10000000 00000000 00000000 255.128.0.0
 
CIDR /10 4,194,304 11111111 11000000 00000000 00000000 255.192.0.0
 
CIDR /11 2,097,152 11111111 11100000 00000000 00000000 255.224.0.0
 
CIDR /12 1,048,576 11111111 11110000 00000000 00000000 255.240.0.0
 
CIDR /13 524,288 11111111 11111000 00000000 00000000 255.248.0.0
 
CIDR /14 262,144 11111111 11111100 00000000 00000000 255.252.0.0
 
CIDR /15 131,072 11111111 11111110 00000000 00000000 255.254.0.0
 
B /16 65,534 11111111 11111111 00000000 00000000 255.255.0.0
 
CIDR /17 32,768 11111111 11111111 10000000 00000000 255.255.128.0
 
CIDR /18 16,384 11111111 11111111 11000000 00000000 255.255.192.0
 
CIDR /19 8,192 11111111 11111111 11100000 00000000 255.255.224.0
 
CIDR /20 4,096 11111111 11111111 11110000 00000000 255.255.240.0
 
CIDR /21 2,048 11111111 11111111 11111000 00000000 255.255.248.0
 
CIDR /22 1,024 11111111 11111111 11111100 00000000 255.255.252.0
 
CIDR /23 512 11111111 11111111 11111110 00000000 255.255.254.0
 
C /24 256 11111111 11111111 11111111 00000000 255.255.255.0
 
CIDR /25 128 11111111 11111111 11111111 10000000 255.255.255.128
 
CIDR /26 64 11111111 11111111 11111111 11000000 255.255.255.192
 
CIDR /27 32 11111111 11111111 11111111 11100000 255.255.255.224
 
CIDR /28 16 11111111 11111111 11111111 11110000 255.255.255.240
 
CIDR /29 8 11111111 11111111 11111111 11111000 255.255.255.248
 
CIDR /30 4 11111111 11111111 11111111 11111100 255.255.255.252
 

http://www.iplocation.net/tools/ip-address.php read more netmask
read more ipaddress