Networking ¶
IPv4 Subnets ¶
Amount of usable addresses in a subnet, is 2 less than total addresses.
CIDR |
Addresses |
Netmask |
Size Comparison |
Comment |
/32 |
1 |
255.255.255.255 |
1/256 of /24 |
A single host |
/31 |
2 |
255.255.255.254 |
1/128 of /24 |
Useless due to 0 usable addresses |
/30 |
4 |
255.255.255.252 |
1/64 of /24 |
|
/29 |
8 |
255.255.255.248 |
1/32 of /24 |
|
/28 |
16 |
255.255.255.240 |
1/16 of /24 |
|
/27 |
32 |
255.255.255.224 |
1/8 of /24 |
|
/26 |
64 |
255.255.255.192 |
1/4 of /24 |
|
/25 |
128 |
255.255.255.128 |
1/2 of /24 |
|
/24 |
256 |
255.255.255.0 |
1 x /24 |
Class C |
/23 |
512 |
255.255.254.0 |
2 x /24 |
|
/22 |
1.024 |
255.255.252.0 |
4 x /24 |
|
/21 |
2.048 |
255.255.248.0 |
8 x /24 |
|
/20 |
4.096 |
255.255.240.0 |
16 x /24 |
|
/19 |
8.192 |
255.255.224.0 |
32 x /24 |
|
/18 |
16.384 |
255.255.192.0 |
64 x /24 |
|
/17 |
32.768 |
255.255.128.0 |
128 x /24 |
|
/16 |
65.536 |
255.255.0.0 |
256 x /24 |
Class B |
/15 |
131.072 |
255.254.0.0 |
2 x /16 |
|
/14 |
262.144 |
255.252.0.0 |
4 x /16 |
|
/13 |
524.288 |
255.248.0.0 |
8 x /16 |
|
/12 |
1.048.576 |
255.240.0.0 |
16 x /16 |
|
/11 |
2.097.152 |
255.224.0.0 |
32 x /16 |
|
/10 |
4.194.304 |
255.192.0.0 |
64 x /16 |
|
/9 |
8.388.608 |
255.128.0.0 |
128 x /16 |
|
/8 |
16.777.216 |
255.0.0.0 |
256 x /16 |
Class A |
/7 |
33.554.432 |
254.0.0.0 |
2 x /8 |
|
/6 |
67.108.864 |
252.0.0.0 |
4 x /8 |
|
/5 |
268.435.456 |
248.0.0.0 |
8 x /8 |
|
/4 |
268.435.456 |
240.0.0.0 |
16 x /8 |
|
/3 |
536.870.912 |
224.0.0.0 |
32 x /8 |
|
/2 |
1.073.741.824 |
192.0.0.0 |
64 x /8 |
|
/1 |
2.147.483.648 |
128.0.0.0 |
128 x /8 |
|
/0 |
4.294.967.296 |
0.0.0.0 |
256 x /8 |
|
IPv4 Subnet Guide ¶
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/24 |
.0 |
.1 |
.254 |
.255 |
256 |
254 |
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/25 |
.0 |
.1 |
.126 |
.127 |
128 |
126 |
/25 |
.128 |
.129 |
.254 |
.255 |
128 |
126 |
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/26 |
.0 |
.1 |
.62 |
.63 |
64 |
62 |
/26 |
.64 |
.65 |
.126 |
.127 |
64 |
62 |
/26 |
.128 |
.129 |
.190 |
.191 |
64 |
62 |
/26 |
.192 |
.193 |
.254 |
.255 |
64 |
62 |
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/27 |
.0 |
.1 |
.30 |
.31 |
32 |
30 |
/27 |
.32 |
.33 |
.62 |
.63 |
32 |
30 |
/27 |
.64 |
.65 |
.94 |
.95 |
32 |
30 |
/27 |
.96 |
.97 |
.126 |
.127 |
32 |
30 |
/27 |
.128 |
.129 |
.158 |
.159 |
32 |
30 |
/27 |
.160 |
.161 |
.190 |
.191 |
32 |
30 |
/27 |
.192 |
.193 |
.222 |
.223 |
32 |
30 |
/27 |
.224 |
.225 |
.254 |
.255 |
32 |
30 |
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/28 |
.0 |
.1 |
.14 |
.15 |
16 |
14 |
/28 |
.16 |
.17 |
.30 |
.31 |
16 |
14 |
/28 |
.32 |
.33 |
.46 |
.47 |
16 |
14 |
/28 |
.48 |
.49 |
.62 |
.63 |
16 |
14 |
/28 |
.64 |
.65 |
.78 |
.79 |
16 |
14 |
/28 |
.80 |
.81 |
.94 |
.95 |
16 |
14 |
/28 |
.96 |
.97 |
.110 |
.111 |
16 |
14 |
/28 |
.112 |
.113 |
.126 |
.127 |
16 |
14 |
/28 |
.128 |
.129 |
.142 |
.143 |
16 |
14 |
/28 |
.144 |
.145 |
.158 |
.159 |
16 |
14 |
/28 |
.160 |
.161 |
.174 |
.175 |
16 |
14 |
/28 |
.176 |
.177 |
.190 |
.191 |
16 |
14 |
/28 |
.192 |
.193 |
.206 |
.207 |
16 |
14 |
/28 |
.208 |
.209 |
.222 |
.223 |
16 |
14 |
/28 |
.224 |
.225 |
.238 |
.239 |
16 |
14 |
/28 |
.240 |
.241 |
.254 |
.255 |
16 |
14 |
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/29 |
.0 |
.1 |
.6 |
.7 |
8 |
6 |
/29 |
.8 |
.9 |
.14 |
.15 |
8 |
6 |
/29 |
.16 |
.17 |
.22 |
.23 |
8 |
6 |
/29 |
.24 |
.25 |
.30 |
.31 |
8 |
6 |
/29 |
.32 |
.33 |
.38 |
.39 |
8 |
6 |
/29 |
.40 |
.41 |
.46 |
.47 |
8 |
6 |
/29 |
.48 |
.49 |
.54 |
.55 |
8 |
6 |
/29 |
.56 |
.57 |
.62 |
.63 |
8 |
6 |
/29 |
.64 |
.65 |
.70 |
.71 |
8 |
6 |
/29 |
.72 |
.73 |
.78 |
.79 |
8 |
6 |
/29 |
.80 |
.81 |
.86 |
.87 |
8 |
6 |
/29 |
.88 |
.89 |
.94 |
.95 |
8 |
6 |
/29 |
.96 |
.97 |
.102 |
.103 |
8 |
6 |
/29 |
.104 |
.105 |
.110 |
.111 |
8 |
6 |
/29 |
.112 |
.113 |
.118 |
.119 |
8 |
6 |
/29 |
.120 |
.121 |
.126 |
.127 |
8 |
6 |
/29 |
.128 |
.129 |
.134 |
.135 |
8 |
6 |
/29 |
.136 |
.137 |
.142 |
.143 |
8 |
6 |
/29 |
.144 |
.145 |
.150 |
.151 |
8 |
6 |
/29 |
.152 |
.153 |
.158 |
.159 |
8 |
6 |
/29 |
.160 |
.161 |
.166 |
.167 |
8 |
6 |
/29 |
.168 |
.169 |
.174 |
.175 |
8 |
6 |
/29 |
.176 |
.177 |
.182 |
.183 |
8 |
6 |
/29 |
.184 |
.185 |
.190 |
.191 |
8 |
6 |
/29 |
.192 |
.193 |
.198 |
.199 |
8 |
6 |
/29 |
.200 |
.201 |
.206 |
.207 |
8 |
6 |
/29 |
.208 |
.209 |
.214 |
.215 |
8 |
6 |
/29 |
.216 |
.217 |
.222 |
.223 |
8 |
6 |
/29 |
.224 |
.225 |
.230 |
.231 |
8 |
6 |
/29 |
.232 |
.233 |
.238 |
.239 |
8 |
6 |
/29 |
.240 |
.241 |
.246 |
.247 |
8 |
6 |
/29 |
.248 |
.249 |
.254 |
.255 |
8 |
6 |
Subnet |
Network |
From |
To |
Broadcast |
Total |
Usable |
/30 |
.0 |
.1 |
.2 |
.3 |
4 |
2 |
/30 |
.4 |
.5 |
.6 |
.7 |
4 |
2 |
/30 |
.8 |
.9 |
.10 |
.11 |
4 |
2 |
/30 |
.12 |
.13 |
.14 |
.15 |
4 |
2 |
/30 |
.16 |
.17 |
.18 |
.19 |
4 |
2 |
/30 |
.20 |
.21 |
.22 |
.23 |
4 |
2 |
/30 |
.24 |
.25 |
.26 |
.27 |
4 |
2 |
/30 |
.28 |
.29 |
.30 |
.31 |
4 |
2 |
/30 |
.32 |
.33 |
.34 |
.35 |
4 |
2 |
/30 |
.36 |
.37 |
.38 |
.39 |
4 |
2 |
/30 |
.40 |
.41 |
.42 |
.43 |
4 |
2 |
/30 |
.44 |
.45 |
.46 |
.47 |
4 |
2 |
/30 |
.48 |
.49 |
.50 |
.51 |
4 |
2 |
/30 |
.52 |
.53 |
.54 |
.55 |
4 |
2 |
/30 |
.56 |
.57 |
.58 |
.59 |
4 |
2 |
/30 |
.60 |
.61 |
.62 |
.63 |
4 |
2 |
/30 |
.64 |
.65 |
.66 |
.67 |
4 |
2 |
/30 |
.68 |
.69 |
.70 |
.71 |
4 |
2 |
/30 |
.72 |
.73 |
.74 |
.75 |
4 |
2 |
/30 |
.76 |
.77 |
.78 |
.79 |
4 |
2 |
/30 |
.80 |
.81 |
.82 |
.83 |
4 |
2 |
/30 |
.84 |
.85 |
.86 |
.87 |
4 |
2 |
/30 |
.88 |
.89 |
.90 |
.91 |
4 |
2 |
/30 |
.92 |
.93 |
.94 |
.95 |
4 |
2 |
/30 |
.96 |
.97 |
.98 |
.99 |
4 |
2 |
/30 |
.100 |
.101 |
.102 |
.103 |
4 |
2 |
/30 |
.104 |
.105 |
.106 |
.107 |
4 |
2 |
/30 |
.108 |
.109 |
.110 |
.111 |
4 |
2 |
/30 |
.112 |
.113 |
.114 |
.115 |
4 |
2 |
/30 |
.116 |
.117 |
.118 |
.119 |
4 |
2 |
/30 |
.120 |
.121 |
.122 |
.123 |
4 |
2 |
/30 |
.124 |
.125 |
.126 |
.127 |
4 |
2 |
/30 |
.128 |
.129 |
.130 |
.131 |
4 |
2 |
/30 |
.132 |
.133 |
.134 |
.135 |
4 |
2 |
/30 |
.136 |
.137 |
.138 |
.139 |
4 |
2 |
/30 |
.140 |
.141 |
.142 |
.143 |
4 |
2 |
/30 |
.144 |
.145 |
.146 |
.147 |
4 |
2 |
/30 |
.148 |
.149 |
.150 |
.151 |
4 |
2 |
/30 |
.152 |
.153 |
.154 |
.155 |
4 |
2 |
/30 |
.156 |
.157 |
.158 |
.159 |
4 |
2 |
/30 |
.160 |
.161 |
.162 |
.163 |
4 |
2 |
/30 |
.164 |
.165 |
.166 |
.167 |
4 |
2 |
/30 |
.168 |
.169 |
.170 |
.171 |
4 |
2 |
/30 |
.172 |
.173 |
.174 |
.175 |
4 |
2 |
/30 |
.176 |
.177 |
.178 |
.179 |
4 |
2 |
/30 |
.180 |
.181 |
.182 |
.183 |
4 |
2 |
/30 |
.184 |
.185 |
.186 |
.187 |
4 |
2 |
/30 |
.188 |
.189 |
.190 |
.191 |
4 |
2 |
/30 |
.192 |
.193 |
.194 |
.195 |
4 |
2 |
/30 |
.196 |
.197 |
.198 |
.199 |
4 |
2 |
/30 |
.200 |
.201 |
.202 |
.203 |
4 |
2 |
/30 |
.204 |
.205 |
.206 |
.207 |
4 |
2 |
/30 |
.208 |
.209 |
.210 |
.211 |
4 |
2 |
/30 |
.212 |
.213 |
.214 |
.215 |
4 |
2 |
/30 |
.216 |
.217 |
.218 |
.219 |
4 |
2 |
/30 |
.220 |
.221 |
.222 |
.223 |
4 |
2 |
/30 |
.224 |
.225 |
.226 |
.227 |
4 |
2 |
/30 |
.228 |
.229 |
.230 |
.231 |
4 |
2 |
/30 |
.232 |
.233 |
.234 |
.235 |
4 |
2 |
/30 |
.236 |
.237 |
.238 |
.239 |
4 |
2 |
/30 |
.240 |
.241 |
.242 |
.243 |
4 |
2 |
/30 |
.244 |
.245 |
.246 |
.247 |
4 |
2 |
/30 |
.248 |
.249 |
.250 |
.251 |
4 |
2 |
/30 |
.252 |
.253 |
.254 |
.255 |
4 |
2 |
IPv4 Reserved Networks ¶
Name |
Network |
Range |
IETF RFC |
localhost |
127.0.0.0/8 |
127.0.0.0 - 127.255.255.255 |
RFC5735 |
Private Network |
10.0.0.0/8 |
10.0.0.0 - 10.255.255.255 |
RFC1918 |
Private Network |
172.16.0.0/12 |
172.16.0.0 - 172.31.255.255 |
RFC1918 |
Private Network |
192.168.0.0/16 |
192.168.0.0 - 192.168.255.255 |
RFC1918 |
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