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)10.2.1.0/24
network10.2.1.0/24
broadcast10.2.1.255
first host10.2.1.1
last host10.2.1.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.1.0/24
address00001010.00000010.00000001.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00000001.00000000
broadcast00001010.00000010.00000001.11111111
green = network part, grey = host part
hex0x0a020100
decimal167903488
reverse dns0.1.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:100

/24 split into /31 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.1.0/3110.2.1.0 – 10.2.1.110.2.1.1
210.2.1.2/3110.2.1.2 – 10.2.1.310.2.1.3
310.2.1.4/3110.2.1.4 – 10.2.1.510.2.1.5
410.2.1.6/3110.2.1.6 – 10.2.1.710.2.1.7
510.2.1.8/3110.2.1.8 – 10.2.1.910.2.1.9
610.2.1.10/3110.2.1.10 – 10.2.1.1110.2.1.11
710.2.1.12/3110.2.1.12 – 10.2.1.1310.2.1.13
810.2.1.14/3110.2.1.14 – 10.2.1.1510.2.1.15
910.2.1.16/3110.2.1.16 – 10.2.1.1710.2.1.17
1010.2.1.18/3110.2.1.18 – 10.2.1.1910.2.1.19
1110.2.1.20/3110.2.1.20 – 10.2.1.2110.2.1.21
1210.2.1.22/3110.2.1.22 – 10.2.1.2310.2.1.23
1310.2.1.24/3110.2.1.24 – 10.2.1.2510.2.1.25
1410.2.1.26/3110.2.1.26 – 10.2.1.2710.2.1.27
1510.2.1.28/3110.2.1.28 – 10.2.1.2910.2.1.29
1610.2.1.30/3110.2.1.30 – 10.2.1.3110.2.1.31
1710.2.1.32/3110.2.1.32 – 10.2.1.3310.2.1.33
1810.2.1.34/3110.2.1.34 – 10.2.1.3510.2.1.35
1910.2.1.36/3110.2.1.36 – 10.2.1.3710.2.1.37
2010.2.1.38/3110.2.1.38 – 10.2.1.3910.2.1.39
2110.2.1.40/3110.2.1.40 – 10.2.1.4110.2.1.41
2210.2.1.42/3110.2.1.42 – 10.2.1.4310.2.1.43
2310.2.1.44/3110.2.1.44 – 10.2.1.4510.2.1.45
2410.2.1.46/3110.2.1.46 – 10.2.1.4710.2.1.47
2510.2.1.48/3110.2.1.48 – 10.2.1.4910.2.1.49
2610.2.1.50/3110.2.1.50 – 10.2.1.5110.2.1.51
2710.2.1.52/3110.2.1.52 – 10.2.1.5310.2.1.53
2810.2.1.54/3110.2.1.54 – 10.2.1.5510.2.1.55
2910.2.1.56/3110.2.1.56 – 10.2.1.5710.2.1.57
3010.2.1.58/3110.2.1.58 – 10.2.1.5910.2.1.59
3110.2.1.60/3110.2.1.60 – 10.2.1.6110.2.1.61
3210.2.1.62/3110.2.1.62 – 10.2.1.6310.2.1.63
3310.2.1.64/3110.2.1.64 – 10.2.1.6510.2.1.65
3410.2.1.66/3110.2.1.66 – 10.2.1.6710.2.1.67
3510.2.1.68/3110.2.1.68 – 10.2.1.6910.2.1.69
3610.2.1.70/3110.2.1.70 – 10.2.1.7110.2.1.71
3710.2.1.72/3110.2.1.72 – 10.2.1.7310.2.1.73
3810.2.1.74/3110.2.1.74 – 10.2.1.7510.2.1.75
3910.2.1.76/3110.2.1.76 – 10.2.1.7710.2.1.77
4010.2.1.78/3110.2.1.78 – 10.2.1.7910.2.1.79
4110.2.1.80/3110.2.1.80 – 10.2.1.8110.2.1.81
4210.2.1.82/3110.2.1.82 – 10.2.1.8310.2.1.83
4310.2.1.84/3110.2.1.84 – 10.2.1.8510.2.1.85
4410.2.1.86/3110.2.1.86 – 10.2.1.8710.2.1.87
4510.2.1.88/3110.2.1.88 – 10.2.1.8910.2.1.89
4610.2.1.90/3110.2.1.90 – 10.2.1.9110.2.1.91
4710.2.1.92/3110.2.1.92 – 10.2.1.9310.2.1.93
4810.2.1.94/3110.2.1.94 – 10.2.1.9510.2.1.95
4910.2.1.96/3110.2.1.96 – 10.2.1.9710.2.1.97
5010.2.1.98/3110.2.1.98 – 10.2.1.9910.2.1.99
5110.2.1.100/3110.2.1.100 – 10.2.1.10110.2.1.101
5210.2.1.102/3110.2.1.102 – 10.2.1.10310.2.1.103
5310.2.1.104/3110.2.1.104 – 10.2.1.10510.2.1.105
5410.2.1.106/3110.2.1.106 – 10.2.1.10710.2.1.107
5510.2.1.108/3110.2.1.108 – 10.2.1.10910.2.1.109
5610.2.1.110/3110.2.1.110 – 10.2.1.11110.2.1.111
5710.2.1.112/3110.2.1.112 – 10.2.1.11310.2.1.113
5810.2.1.114/3110.2.1.114 – 10.2.1.11510.2.1.115
5910.2.1.116/3110.2.1.116 – 10.2.1.11710.2.1.117
6010.2.1.118/3110.2.1.118 – 10.2.1.11910.2.1.119
6110.2.1.120/3110.2.1.120 – 10.2.1.12110.2.1.121
6210.2.1.122/3110.2.1.122 – 10.2.1.12310.2.1.123
6310.2.1.124/3110.2.1.124 – 10.2.1.12510.2.1.125
6410.2.1.126/3110.2.1.126 – 10.2.1.12710.2.1.127
6510.2.1.128/3110.2.1.128 – 10.2.1.12910.2.1.129
6610.2.1.130/3110.2.1.130 – 10.2.1.13110.2.1.131
6710.2.1.132/3110.2.1.132 – 10.2.1.13310.2.1.133
6810.2.1.134/3110.2.1.134 – 10.2.1.13510.2.1.135
6910.2.1.136/3110.2.1.136 – 10.2.1.13710.2.1.137
7010.2.1.138/3110.2.1.138 – 10.2.1.13910.2.1.139
7110.2.1.140/3110.2.1.140 – 10.2.1.14110.2.1.141
7210.2.1.142/3110.2.1.142 – 10.2.1.14310.2.1.143
7310.2.1.144/3110.2.1.144 – 10.2.1.14510.2.1.145
7410.2.1.146/3110.2.1.146 – 10.2.1.14710.2.1.147
7510.2.1.148/3110.2.1.148 – 10.2.1.14910.2.1.149
7610.2.1.150/3110.2.1.150 – 10.2.1.15110.2.1.151
7710.2.1.152/3110.2.1.152 – 10.2.1.15310.2.1.153
7810.2.1.154/3110.2.1.154 – 10.2.1.15510.2.1.155
7910.2.1.156/3110.2.1.156 – 10.2.1.15710.2.1.157
8010.2.1.158/3110.2.1.158 – 10.2.1.15910.2.1.159
8110.2.1.160/3110.2.1.160 – 10.2.1.16110.2.1.161
8210.2.1.162/3110.2.1.162 – 10.2.1.16310.2.1.163
8310.2.1.164/3110.2.1.164 – 10.2.1.16510.2.1.165
8410.2.1.166/3110.2.1.166 – 10.2.1.16710.2.1.167
8510.2.1.168/3110.2.1.168 – 10.2.1.16910.2.1.169
8610.2.1.170/3110.2.1.170 – 10.2.1.17110.2.1.171
8710.2.1.172/3110.2.1.172 – 10.2.1.17310.2.1.173
8810.2.1.174/3110.2.1.174 – 10.2.1.17510.2.1.175
8910.2.1.176/3110.2.1.176 – 10.2.1.17710.2.1.177
9010.2.1.178/3110.2.1.178 – 10.2.1.17910.2.1.179
9110.2.1.180/3110.2.1.180 – 10.2.1.18110.2.1.181
9210.2.1.182/3110.2.1.182 – 10.2.1.18310.2.1.183
9310.2.1.184/3110.2.1.184 – 10.2.1.18510.2.1.185
9410.2.1.186/3110.2.1.186 – 10.2.1.18710.2.1.187
9510.2.1.188/3110.2.1.188 – 10.2.1.18910.2.1.189
9610.2.1.190/3110.2.1.190 – 10.2.1.19110.2.1.191
9710.2.1.192/3110.2.1.192 – 10.2.1.19310.2.1.193
9810.2.1.194/3110.2.1.194 – 10.2.1.19510.2.1.195
9910.2.1.196/3110.2.1.196 – 10.2.1.19710.2.1.197
10010.2.1.198/3110.2.1.198 – 10.2.1.19910.2.1.199
10110.2.1.200/3110.2.1.200 – 10.2.1.20110.2.1.201
10210.2.1.202/3110.2.1.202 – 10.2.1.20310.2.1.203
10310.2.1.204/3110.2.1.204 – 10.2.1.20510.2.1.205
10410.2.1.206/3110.2.1.206 – 10.2.1.20710.2.1.207
10510.2.1.208/3110.2.1.208 – 10.2.1.20910.2.1.209
10610.2.1.210/3110.2.1.210 – 10.2.1.21110.2.1.211
10710.2.1.212/3110.2.1.212 – 10.2.1.21310.2.1.213
10810.2.1.214/3110.2.1.214 – 10.2.1.21510.2.1.215
10910.2.1.216/3110.2.1.216 – 10.2.1.21710.2.1.217
11010.2.1.218/3110.2.1.218 – 10.2.1.21910.2.1.219
11110.2.1.220/3110.2.1.220 – 10.2.1.22110.2.1.221
11210.2.1.222/3110.2.1.222 – 10.2.1.22310.2.1.223
11310.2.1.224/3110.2.1.224 – 10.2.1.22510.2.1.225
11410.2.1.226/3110.2.1.226 – 10.2.1.22710.2.1.227
11510.2.1.228/3110.2.1.228 – 10.2.1.22910.2.1.229
11610.2.1.230/3110.2.1.230 – 10.2.1.23110.2.1.231
11710.2.1.232/3110.2.1.232 – 10.2.1.23310.2.1.233
11810.2.1.234/3110.2.1.234 – 10.2.1.23510.2.1.235
11910.2.1.236/3110.2.1.236 – 10.2.1.23710.2.1.237
12010.2.1.238/3110.2.1.238 – 10.2.1.23910.2.1.239
12110.2.1.240/3110.2.1.240 – 10.2.1.24110.2.1.241
12210.2.1.242/3110.2.1.242 – 10.2.1.24310.2.1.243
12310.2.1.244/3110.2.1.244 – 10.2.1.24510.2.1.245
12410.2.1.246/3110.2.1.246 – 10.2.1.24710.2.1.247
12510.2.1.248/3110.2.1.248 – 10.2.1.24910.2.1.249
12610.2.1.250/3110.2.1.250 – 10.2.1.25110.2.1.251
12710.2.1.252/3110.2.1.252 – 10.2.1.25310.2.1.253
12810.2.1.254/3110.2.1.254 – 10.2.1.25510.2.1.255
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 →