ip
ipku.in

IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
Try:192.168.1.10/2410.0.0.0/8172.16.5.4/20203.0.113.9/29
IPv6 calculator →
private IP (RFC 1918)10.2.31.0/24
network10.2.31.0/24
broadcast10.2.31.255
first host10.2.31.1
last host10.2.31.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.31.0/24
address00001010.00000010.00011111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00011111.00000000
broadcast00001010.00000010.00011111.11111111
green = network part, grey = host part
hex0x0a021f00
decimal167911168
reverse dns0.31.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1f00

/24 split into /31 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.31.0/3110.2.31.0 – 10.2.31.110.2.31.1
210.2.31.2/3110.2.31.2 – 10.2.31.310.2.31.3
310.2.31.4/3110.2.31.4 – 10.2.31.510.2.31.5
410.2.31.6/3110.2.31.6 – 10.2.31.710.2.31.7
510.2.31.8/3110.2.31.8 – 10.2.31.910.2.31.9
610.2.31.10/3110.2.31.10 – 10.2.31.1110.2.31.11
710.2.31.12/3110.2.31.12 – 10.2.31.1310.2.31.13
810.2.31.14/3110.2.31.14 – 10.2.31.1510.2.31.15
910.2.31.16/3110.2.31.16 – 10.2.31.1710.2.31.17
1010.2.31.18/3110.2.31.18 – 10.2.31.1910.2.31.19
1110.2.31.20/3110.2.31.20 – 10.2.31.2110.2.31.21
1210.2.31.22/3110.2.31.22 – 10.2.31.2310.2.31.23
1310.2.31.24/3110.2.31.24 – 10.2.31.2510.2.31.25
1410.2.31.26/3110.2.31.26 – 10.2.31.2710.2.31.27
1510.2.31.28/3110.2.31.28 – 10.2.31.2910.2.31.29
1610.2.31.30/3110.2.31.30 – 10.2.31.3110.2.31.31
1710.2.31.32/3110.2.31.32 – 10.2.31.3310.2.31.33
1810.2.31.34/3110.2.31.34 – 10.2.31.3510.2.31.35
1910.2.31.36/3110.2.31.36 – 10.2.31.3710.2.31.37
2010.2.31.38/3110.2.31.38 – 10.2.31.3910.2.31.39
2110.2.31.40/3110.2.31.40 – 10.2.31.4110.2.31.41
2210.2.31.42/3110.2.31.42 – 10.2.31.4310.2.31.43
2310.2.31.44/3110.2.31.44 – 10.2.31.4510.2.31.45
2410.2.31.46/3110.2.31.46 – 10.2.31.4710.2.31.47
2510.2.31.48/3110.2.31.48 – 10.2.31.4910.2.31.49
2610.2.31.50/3110.2.31.50 – 10.2.31.5110.2.31.51
2710.2.31.52/3110.2.31.52 – 10.2.31.5310.2.31.53
2810.2.31.54/3110.2.31.54 – 10.2.31.5510.2.31.55
2910.2.31.56/3110.2.31.56 – 10.2.31.5710.2.31.57
3010.2.31.58/3110.2.31.58 – 10.2.31.5910.2.31.59
3110.2.31.60/3110.2.31.60 – 10.2.31.6110.2.31.61
3210.2.31.62/3110.2.31.62 – 10.2.31.6310.2.31.63
3310.2.31.64/3110.2.31.64 – 10.2.31.6510.2.31.65
3410.2.31.66/3110.2.31.66 – 10.2.31.6710.2.31.67
3510.2.31.68/3110.2.31.68 – 10.2.31.6910.2.31.69
3610.2.31.70/3110.2.31.70 – 10.2.31.7110.2.31.71
3710.2.31.72/3110.2.31.72 – 10.2.31.7310.2.31.73
3810.2.31.74/3110.2.31.74 – 10.2.31.7510.2.31.75
3910.2.31.76/3110.2.31.76 – 10.2.31.7710.2.31.77
4010.2.31.78/3110.2.31.78 – 10.2.31.7910.2.31.79
4110.2.31.80/3110.2.31.80 – 10.2.31.8110.2.31.81
4210.2.31.82/3110.2.31.82 – 10.2.31.8310.2.31.83
4310.2.31.84/3110.2.31.84 – 10.2.31.8510.2.31.85
4410.2.31.86/3110.2.31.86 – 10.2.31.8710.2.31.87
4510.2.31.88/3110.2.31.88 – 10.2.31.8910.2.31.89
4610.2.31.90/3110.2.31.90 – 10.2.31.9110.2.31.91
4710.2.31.92/3110.2.31.92 – 10.2.31.9310.2.31.93
4810.2.31.94/3110.2.31.94 – 10.2.31.9510.2.31.95
4910.2.31.96/3110.2.31.96 – 10.2.31.9710.2.31.97
5010.2.31.98/3110.2.31.98 – 10.2.31.9910.2.31.99
5110.2.31.100/3110.2.31.100 – 10.2.31.10110.2.31.101
5210.2.31.102/3110.2.31.102 – 10.2.31.10310.2.31.103
5310.2.31.104/3110.2.31.104 – 10.2.31.10510.2.31.105
5410.2.31.106/3110.2.31.106 – 10.2.31.10710.2.31.107
5510.2.31.108/3110.2.31.108 – 10.2.31.10910.2.31.109
5610.2.31.110/3110.2.31.110 – 10.2.31.11110.2.31.111
5710.2.31.112/3110.2.31.112 – 10.2.31.11310.2.31.113
5810.2.31.114/3110.2.31.114 – 10.2.31.11510.2.31.115
5910.2.31.116/3110.2.31.116 – 10.2.31.11710.2.31.117
6010.2.31.118/3110.2.31.118 – 10.2.31.11910.2.31.119
6110.2.31.120/3110.2.31.120 – 10.2.31.12110.2.31.121
6210.2.31.122/3110.2.31.122 – 10.2.31.12310.2.31.123
6310.2.31.124/3110.2.31.124 – 10.2.31.12510.2.31.125
6410.2.31.126/3110.2.31.126 – 10.2.31.12710.2.31.127
6510.2.31.128/3110.2.31.128 – 10.2.31.12910.2.31.129
6610.2.31.130/3110.2.31.130 – 10.2.31.13110.2.31.131
6710.2.31.132/3110.2.31.132 – 10.2.31.13310.2.31.133
6810.2.31.134/3110.2.31.134 – 10.2.31.13510.2.31.135
6910.2.31.136/3110.2.31.136 – 10.2.31.13710.2.31.137
7010.2.31.138/3110.2.31.138 – 10.2.31.13910.2.31.139
7110.2.31.140/3110.2.31.140 – 10.2.31.14110.2.31.141
7210.2.31.142/3110.2.31.142 – 10.2.31.14310.2.31.143
7310.2.31.144/3110.2.31.144 – 10.2.31.14510.2.31.145
7410.2.31.146/3110.2.31.146 – 10.2.31.14710.2.31.147
7510.2.31.148/3110.2.31.148 – 10.2.31.14910.2.31.149
7610.2.31.150/3110.2.31.150 – 10.2.31.15110.2.31.151
7710.2.31.152/3110.2.31.152 – 10.2.31.15310.2.31.153
7810.2.31.154/3110.2.31.154 – 10.2.31.15510.2.31.155
7910.2.31.156/3110.2.31.156 – 10.2.31.15710.2.31.157
8010.2.31.158/3110.2.31.158 – 10.2.31.15910.2.31.159
8110.2.31.160/3110.2.31.160 – 10.2.31.16110.2.31.161
8210.2.31.162/3110.2.31.162 – 10.2.31.16310.2.31.163
8310.2.31.164/3110.2.31.164 – 10.2.31.16510.2.31.165
8410.2.31.166/3110.2.31.166 – 10.2.31.16710.2.31.167
8510.2.31.168/3110.2.31.168 – 10.2.31.16910.2.31.169
8610.2.31.170/3110.2.31.170 – 10.2.31.17110.2.31.171
8710.2.31.172/3110.2.31.172 – 10.2.31.17310.2.31.173
8810.2.31.174/3110.2.31.174 – 10.2.31.17510.2.31.175
8910.2.31.176/3110.2.31.176 – 10.2.31.17710.2.31.177
9010.2.31.178/3110.2.31.178 – 10.2.31.17910.2.31.179
9110.2.31.180/3110.2.31.180 – 10.2.31.18110.2.31.181
9210.2.31.182/3110.2.31.182 – 10.2.31.18310.2.31.183
9310.2.31.184/3110.2.31.184 – 10.2.31.18510.2.31.185
9410.2.31.186/3110.2.31.186 – 10.2.31.18710.2.31.187
9510.2.31.188/3110.2.31.188 – 10.2.31.18910.2.31.189
9610.2.31.190/3110.2.31.190 – 10.2.31.19110.2.31.191
9710.2.31.192/3110.2.31.192 – 10.2.31.19310.2.31.193
9810.2.31.194/3110.2.31.194 – 10.2.31.19510.2.31.195
9910.2.31.196/3110.2.31.196 – 10.2.31.19710.2.31.197
10010.2.31.198/3110.2.31.198 – 10.2.31.19910.2.31.199
10110.2.31.200/3110.2.31.200 – 10.2.31.20110.2.31.201
10210.2.31.202/3110.2.31.202 – 10.2.31.20310.2.31.203
10310.2.31.204/3110.2.31.204 – 10.2.31.20510.2.31.205
10410.2.31.206/3110.2.31.206 – 10.2.31.20710.2.31.207
10510.2.31.208/3110.2.31.208 – 10.2.31.20910.2.31.209
10610.2.31.210/3110.2.31.210 – 10.2.31.21110.2.31.211
10710.2.31.212/3110.2.31.212 – 10.2.31.21310.2.31.213
10810.2.31.214/3110.2.31.214 – 10.2.31.21510.2.31.215
10910.2.31.216/3110.2.31.216 – 10.2.31.21710.2.31.217
11010.2.31.218/3110.2.31.218 – 10.2.31.21910.2.31.219
11110.2.31.220/3110.2.31.220 – 10.2.31.22110.2.31.221
11210.2.31.222/3110.2.31.222 – 10.2.31.22310.2.31.223
11310.2.31.224/3110.2.31.224 – 10.2.31.22510.2.31.225
11410.2.31.226/3110.2.31.226 – 10.2.31.22710.2.31.227
11510.2.31.228/3110.2.31.228 – 10.2.31.22910.2.31.229
11610.2.31.230/3110.2.31.230 – 10.2.31.23110.2.31.231
11710.2.31.232/3110.2.31.232 – 10.2.31.23310.2.31.233
11810.2.31.234/3110.2.31.234 – 10.2.31.23510.2.31.235
11910.2.31.236/3110.2.31.236 – 10.2.31.23710.2.31.237
12010.2.31.238/3110.2.31.238 – 10.2.31.23910.2.31.239
12110.2.31.240/3110.2.31.240 – 10.2.31.24110.2.31.241
12210.2.31.242/3110.2.31.242 – 10.2.31.24310.2.31.243
12310.2.31.244/3110.2.31.244 – 10.2.31.24510.2.31.245
12410.2.31.246/3110.2.31.246 – 10.2.31.24710.2.31.247
12510.2.31.248/3110.2.31.248 – 10.2.31.24910.2.31.249
12610.2.31.250/3110.2.31.250 – 10.2.31.25110.2.31.251
12710.2.31.252/3110.2.31.252 – 10.2.31.25310.2.31.253
12810.2.31.254/3110.2.31.254 – 10.2.31.25510.2.31.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →