IPv4 Addresses and IPv4 Subnetting
CIDR SUBNET MASK
ADDRESSES
WILDCARD MASK
Classful IPv4 Addresses
/32
1
Class A
0.0.0.0-127.255.255.255
/31
255.255.255.254
2
Class B
128.0.0.0-191.255.255.255
/30
255.255.255.252
4
Class C
192.0.0.0-223.255.255.255
/29
255.255.255.248
8
Class D
224.0.0.0-239.255.255.255
/28
255.255.255.240
16
0.0.0.15
Class E
240.0.0.0-255.255.255.255
/27
255.255.255.224
32
0.0.0.31
Private IPv4 Addresses
/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
Local Host
/19
255.255.224.0
8192
0.0.31.255
APIPA
10.0.0.0-10.255.255.255
172.16.0.0-172.31.255.255
192.168.0.0-192.168.255.255
Special IPv4 Addresses
127.0.0.0-127.255.255.255
169.254.0.0-169.254.255.255
/18 255.255.192.0
16384
0.0.63.255
Bogon IPv4 Addresses
/17
255.255.128.0
32768
0.0.127.255
/16
255.255.0.0
65536
0.0.255.255
0.0.0.0/8
This network
/15
255.254.0.0
131072
0.1.255.255
10.0.0.0/8
Private IPv4 Address Block
/14
255.252.0.0
262144
0.3.255.255
100.64.0.0/10
Carrier-grade NAT
/13
255.248.0.0
524288
0.7.255.255
127.0.0.0/8
Loopback
/12
255.240.0.0
1048576
0.15.255.255
127.0.53.53
Name collision occurrence
/11
255.224.0.0
2097152
0.31.255.255
169.254.0.0/16
Link local
/10
255.192.0.0
4194304
0.63.255.255
172.16.0.0/12
Private IPv4 Address Block
19
255.128.0.0
8388608
0.127.255.255
192.0.0.0/24
IETF protocol assignments
/8
255.0.0.0
16777216
0.255.255.255
192.0.2.0/24
TEST-NET-1
17
254.0.0.0
33554432
1.255.255.255
192.168.0.0/16
Private IPv4 Address Block
/6
252.0.0.0
67108864
3.255.255.255
198.18.0.0/15
Network benchmark testing
/5
248.0.0.0
134217728
7.255.255.255
198.51.100.0/24
TEST-NET-2
/4
240.0.0.0
268435456
15.255.255.255
203.0.113.0/24
TEST-NET-3
/3
224.0.0.0
536870912
31.255.255.255
224.0.0.0/4
Multicast
/2
192.0.0.0
1073741824
63.255.255.255
240.0.0.0/4
Reserved
/1
128.0.0.0
2147483648
127.255.255.255
255.255.255.255/32
Limited broadcast
10
0.0.0.0
4294967296
255.255.255.255
