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)10.2.15.0/24
network10.2.15.0/24
broadcast10.2.15.255
first host10.2.15.1
last host10.2.15.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.15.0/24
address00001010.00000010.00001111.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.00001111.00000000
broadcast00001010.00000010.00001111.11111111
green = network part, grey = host part
hex0x0a020f00
decimal167907072
reverse dns0.15.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:f00

/24 split into /31 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.15.0/3110.2.15.0 – 10.2.15.110.2.15.1
210.2.15.2/3110.2.15.2 – 10.2.15.310.2.15.3
310.2.15.4/3110.2.15.4 – 10.2.15.510.2.15.5
410.2.15.6/3110.2.15.6 – 10.2.15.710.2.15.7
510.2.15.8/3110.2.15.8 – 10.2.15.910.2.15.9
610.2.15.10/3110.2.15.10 – 10.2.15.1110.2.15.11
710.2.15.12/3110.2.15.12 – 10.2.15.1310.2.15.13
810.2.15.14/3110.2.15.14 – 10.2.15.1510.2.15.15
910.2.15.16/3110.2.15.16 – 10.2.15.1710.2.15.17
1010.2.15.18/3110.2.15.18 – 10.2.15.1910.2.15.19
1110.2.15.20/3110.2.15.20 – 10.2.15.2110.2.15.21
1210.2.15.22/3110.2.15.22 – 10.2.15.2310.2.15.23
1310.2.15.24/3110.2.15.24 – 10.2.15.2510.2.15.25
1410.2.15.26/3110.2.15.26 – 10.2.15.2710.2.15.27
1510.2.15.28/3110.2.15.28 – 10.2.15.2910.2.15.29
1610.2.15.30/3110.2.15.30 – 10.2.15.3110.2.15.31
1710.2.15.32/3110.2.15.32 – 10.2.15.3310.2.15.33
1810.2.15.34/3110.2.15.34 – 10.2.15.3510.2.15.35
1910.2.15.36/3110.2.15.36 – 10.2.15.3710.2.15.37
2010.2.15.38/3110.2.15.38 – 10.2.15.3910.2.15.39
2110.2.15.40/3110.2.15.40 – 10.2.15.4110.2.15.41
2210.2.15.42/3110.2.15.42 – 10.2.15.4310.2.15.43
2310.2.15.44/3110.2.15.44 – 10.2.15.4510.2.15.45
2410.2.15.46/3110.2.15.46 – 10.2.15.4710.2.15.47
2510.2.15.48/3110.2.15.48 – 10.2.15.4910.2.15.49
2610.2.15.50/3110.2.15.50 – 10.2.15.5110.2.15.51
2710.2.15.52/3110.2.15.52 – 10.2.15.5310.2.15.53
2810.2.15.54/3110.2.15.54 – 10.2.15.5510.2.15.55
2910.2.15.56/3110.2.15.56 – 10.2.15.5710.2.15.57
3010.2.15.58/3110.2.15.58 – 10.2.15.5910.2.15.59
3110.2.15.60/3110.2.15.60 – 10.2.15.6110.2.15.61
3210.2.15.62/3110.2.15.62 – 10.2.15.6310.2.15.63
3310.2.15.64/3110.2.15.64 – 10.2.15.6510.2.15.65
3410.2.15.66/3110.2.15.66 – 10.2.15.6710.2.15.67
3510.2.15.68/3110.2.15.68 – 10.2.15.6910.2.15.69
3610.2.15.70/3110.2.15.70 – 10.2.15.7110.2.15.71
3710.2.15.72/3110.2.15.72 – 10.2.15.7310.2.15.73
3810.2.15.74/3110.2.15.74 – 10.2.15.7510.2.15.75
3910.2.15.76/3110.2.15.76 – 10.2.15.7710.2.15.77
4010.2.15.78/3110.2.15.78 – 10.2.15.7910.2.15.79
4110.2.15.80/3110.2.15.80 – 10.2.15.8110.2.15.81
4210.2.15.82/3110.2.15.82 – 10.2.15.8310.2.15.83
4310.2.15.84/3110.2.15.84 – 10.2.15.8510.2.15.85
4410.2.15.86/3110.2.15.86 – 10.2.15.8710.2.15.87
4510.2.15.88/3110.2.15.88 – 10.2.15.8910.2.15.89
4610.2.15.90/3110.2.15.90 – 10.2.15.9110.2.15.91
4710.2.15.92/3110.2.15.92 – 10.2.15.9310.2.15.93
4810.2.15.94/3110.2.15.94 – 10.2.15.9510.2.15.95
4910.2.15.96/3110.2.15.96 – 10.2.15.9710.2.15.97
5010.2.15.98/3110.2.15.98 – 10.2.15.9910.2.15.99
5110.2.15.100/3110.2.15.100 – 10.2.15.10110.2.15.101
5210.2.15.102/3110.2.15.102 – 10.2.15.10310.2.15.103
5310.2.15.104/3110.2.15.104 – 10.2.15.10510.2.15.105
5410.2.15.106/3110.2.15.106 – 10.2.15.10710.2.15.107
5510.2.15.108/3110.2.15.108 – 10.2.15.10910.2.15.109
5610.2.15.110/3110.2.15.110 – 10.2.15.11110.2.15.111
5710.2.15.112/3110.2.15.112 – 10.2.15.11310.2.15.113
5810.2.15.114/3110.2.15.114 – 10.2.15.11510.2.15.115
5910.2.15.116/3110.2.15.116 – 10.2.15.11710.2.15.117
6010.2.15.118/3110.2.15.118 – 10.2.15.11910.2.15.119
6110.2.15.120/3110.2.15.120 – 10.2.15.12110.2.15.121
6210.2.15.122/3110.2.15.122 – 10.2.15.12310.2.15.123
6310.2.15.124/3110.2.15.124 – 10.2.15.12510.2.15.125
6410.2.15.126/3110.2.15.126 – 10.2.15.12710.2.15.127
6510.2.15.128/3110.2.15.128 – 10.2.15.12910.2.15.129
6610.2.15.130/3110.2.15.130 – 10.2.15.13110.2.15.131
6710.2.15.132/3110.2.15.132 – 10.2.15.13310.2.15.133
6810.2.15.134/3110.2.15.134 – 10.2.15.13510.2.15.135
6910.2.15.136/3110.2.15.136 – 10.2.15.13710.2.15.137
7010.2.15.138/3110.2.15.138 – 10.2.15.13910.2.15.139
7110.2.15.140/3110.2.15.140 – 10.2.15.14110.2.15.141
7210.2.15.142/3110.2.15.142 – 10.2.15.14310.2.15.143
7310.2.15.144/3110.2.15.144 – 10.2.15.14510.2.15.145
7410.2.15.146/3110.2.15.146 – 10.2.15.14710.2.15.147
7510.2.15.148/3110.2.15.148 – 10.2.15.14910.2.15.149
7610.2.15.150/3110.2.15.150 – 10.2.15.15110.2.15.151
7710.2.15.152/3110.2.15.152 – 10.2.15.15310.2.15.153
7810.2.15.154/3110.2.15.154 – 10.2.15.15510.2.15.155
7910.2.15.156/3110.2.15.156 – 10.2.15.15710.2.15.157
8010.2.15.158/3110.2.15.158 – 10.2.15.15910.2.15.159
8110.2.15.160/3110.2.15.160 – 10.2.15.16110.2.15.161
8210.2.15.162/3110.2.15.162 – 10.2.15.16310.2.15.163
8310.2.15.164/3110.2.15.164 – 10.2.15.16510.2.15.165
8410.2.15.166/3110.2.15.166 – 10.2.15.16710.2.15.167
8510.2.15.168/3110.2.15.168 – 10.2.15.16910.2.15.169
8610.2.15.170/3110.2.15.170 – 10.2.15.17110.2.15.171
8710.2.15.172/3110.2.15.172 – 10.2.15.17310.2.15.173
8810.2.15.174/3110.2.15.174 – 10.2.15.17510.2.15.175
8910.2.15.176/3110.2.15.176 – 10.2.15.17710.2.15.177
9010.2.15.178/3110.2.15.178 – 10.2.15.17910.2.15.179
9110.2.15.180/3110.2.15.180 – 10.2.15.18110.2.15.181
9210.2.15.182/3110.2.15.182 – 10.2.15.18310.2.15.183
9310.2.15.184/3110.2.15.184 – 10.2.15.18510.2.15.185
9410.2.15.186/3110.2.15.186 – 10.2.15.18710.2.15.187
9510.2.15.188/3110.2.15.188 – 10.2.15.18910.2.15.189
9610.2.15.190/3110.2.15.190 – 10.2.15.19110.2.15.191
9710.2.15.192/3110.2.15.192 – 10.2.15.19310.2.15.193
9810.2.15.194/3110.2.15.194 – 10.2.15.19510.2.15.195
9910.2.15.196/3110.2.15.196 – 10.2.15.19710.2.15.197
10010.2.15.198/3110.2.15.198 – 10.2.15.19910.2.15.199
10110.2.15.200/3110.2.15.200 – 10.2.15.20110.2.15.201
10210.2.15.202/3110.2.15.202 – 10.2.15.20310.2.15.203
10310.2.15.204/3110.2.15.204 – 10.2.15.20510.2.15.205
10410.2.15.206/3110.2.15.206 – 10.2.15.20710.2.15.207
10510.2.15.208/3110.2.15.208 – 10.2.15.20910.2.15.209
10610.2.15.210/3110.2.15.210 – 10.2.15.21110.2.15.211
10710.2.15.212/3110.2.15.212 – 10.2.15.21310.2.15.213
10810.2.15.214/3110.2.15.214 – 10.2.15.21510.2.15.215
10910.2.15.216/3110.2.15.216 – 10.2.15.21710.2.15.217
11010.2.15.218/3110.2.15.218 – 10.2.15.21910.2.15.219
11110.2.15.220/3110.2.15.220 – 10.2.15.22110.2.15.221
11210.2.15.222/3110.2.15.222 – 10.2.15.22310.2.15.223
11310.2.15.224/3110.2.15.224 – 10.2.15.22510.2.15.225
11410.2.15.226/3110.2.15.226 – 10.2.15.22710.2.15.227
11510.2.15.228/3110.2.15.228 – 10.2.15.22910.2.15.229
11610.2.15.230/3110.2.15.230 – 10.2.15.23110.2.15.231
11710.2.15.232/3110.2.15.232 – 10.2.15.23310.2.15.233
11810.2.15.234/3110.2.15.234 – 10.2.15.23510.2.15.235
11910.2.15.236/3110.2.15.236 – 10.2.15.23710.2.15.237
12010.2.15.238/3110.2.15.238 – 10.2.15.23910.2.15.239
12110.2.15.240/3110.2.15.240 – 10.2.15.24110.2.15.241
12210.2.15.242/3110.2.15.242 – 10.2.15.24310.2.15.243
12310.2.15.244/3110.2.15.244 – 10.2.15.24510.2.15.245
12410.2.15.246/3110.2.15.246 – 10.2.15.24710.2.15.247
12510.2.15.248/3110.2.15.248 – 10.2.15.24910.2.15.249
12610.2.15.250/3110.2.15.250 – 10.2.15.25110.2.15.251
12710.2.15.252/3110.2.15.252 – 10.2.15.25310.2.15.253
12810.2.15.254/3110.2.15.254 – 10.2.15.25510.2.15.255
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 →