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)10.3.72.0/24
network10.3.72.0/24
broadcast10.3.72.255
first host10.3.72.1
last host10.3.72.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.3.72.0/24
address00001010.00000011.01001000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000011.01001000.00000000
broadcast00001010.00000011.01001000.11111111
green = network part, grey = host part
hex0x0a034800
decimal167987200
reverse dns0.72.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4800

/24 split into /31 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.72.0/3110.3.72.0 – 10.3.72.110.3.72.1
210.3.72.2/3110.3.72.2 – 10.3.72.310.3.72.3
310.3.72.4/3110.3.72.4 – 10.3.72.510.3.72.5
410.3.72.6/3110.3.72.6 – 10.3.72.710.3.72.7
510.3.72.8/3110.3.72.8 – 10.3.72.910.3.72.9
610.3.72.10/3110.3.72.10 – 10.3.72.1110.3.72.11
710.3.72.12/3110.3.72.12 – 10.3.72.1310.3.72.13
810.3.72.14/3110.3.72.14 – 10.3.72.1510.3.72.15
910.3.72.16/3110.3.72.16 – 10.3.72.1710.3.72.17
1010.3.72.18/3110.3.72.18 – 10.3.72.1910.3.72.19
1110.3.72.20/3110.3.72.20 – 10.3.72.2110.3.72.21
1210.3.72.22/3110.3.72.22 – 10.3.72.2310.3.72.23
1310.3.72.24/3110.3.72.24 – 10.3.72.2510.3.72.25
1410.3.72.26/3110.3.72.26 – 10.3.72.2710.3.72.27
1510.3.72.28/3110.3.72.28 – 10.3.72.2910.3.72.29
1610.3.72.30/3110.3.72.30 – 10.3.72.3110.3.72.31
1710.3.72.32/3110.3.72.32 – 10.3.72.3310.3.72.33
1810.3.72.34/3110.3.72.34 – 10.3.72.3510.3.72.35
1910.3.72.36/3110.3.72.36 – 10.3.72.3710.3.72.37
2010.3.72.38/3110.3.72.38 – 10.3.72.3910.3.72.39
2110.3.72.40/3110.3.72.40 – 10.3.72.4110.3.72.41
2210.3.72.42/3110.3.72.42 – 10.3.72.4310.3.72.43
2310.3.72.44/3110.3.72.44 – 10.3.72.4510.3.72.45
2410.3.72.46/3110.3.72.46 – 10.3.72.4710.3.72.47
2510.3.72.48/3110.3.72.48 – 10.3.72.4910.3.72.49
2610.3.72.50/3110.3.72.50 – 10.3.72.5110.3.72.51
2710.3.72.52/3110.3.72.52 – 10.3.72.5310.3.72.53
2810.3.72.54/3110.3.72.54 – 10.3.72.5510.3.72.55
2910.3.72.56/3110.3.72.56 – 10.3.72.5710.3.72.57
3010.3.72.58/3110.3.72.58 – 10.3.72.5910.3.72.59
3110.3.72.60/3110.3.72.60 – 10.3.72.6110.3.72.61
3210.3.72.62/3110.3.72.62 – 10.3.72.6310.3.72.63
3310.3.72.64/3110.3.72.64 – 10.3.72.6510.3.72.65
3410.3.72.66/3110.3.72.66 – 10.3.72.6710.3.72.67
3510.3.72.68/3110.3.72.68 – 10.3.72.6910.3.72.69
3610.3.72.70/3110.3.72.70 – 10.3.72.7110.3.72.71
3710.3.72.72/3110.3.72.72 – 10.3.72.7310.3.72.73
3810.3.72.74/3110.3.72.74 – 10.3.72.7510.3.72.75
3910.3.72.76/3110.3.72.76 – 10.3.72.7710.3.72.77
4010.3.72.78/3110.3.72.78 – 10.3.72.7910.3.72.79
4110.3.72.80/3110.3.72.80 – 10.3.72.8110.3.72.81
4210.3.72.82/3110.3.72.82 – 10.3.72.8310.3.72.83
4310.3.72.84/3110.3.72.84 – 10.3.72.8510.3.72.85
4410.3.72.86/3110.3.72.86 – 10.3.72.8710.3.72.87
4510.3.72.88/3110.3.72.88 – 10.3.72.8910.3.72.89
4610.3.72.90/3110.3.72.90 – 10.3.72.9110.3.72.91
4710.3.72.92/3110.3.72.92 – 10.3.72.9310.3.72.93
4810.3.72.94/3110.3.72.94 – 10.3.72.9510.3.72.95
4910.3.72.96/3110.3.72.96 – 10.3.72.9710.3.72.97
5010.3.72.98/3110.3.72.98 – 10.3.72.9910.3.72.99
5110.3.72.100/3110.3.72.100 – 10.3.72.10110.3.72.101
5210.3.72.102/3110.3.72.102 – 10.3.72.10310.3.72.103
5310.3.72.104/3110.3.72.104 – 10.3.72.10510.3.72.105
5410.3.72.106/3110.3.72.106 – 10.3.72.10710.3.72.107
5510.3.72.108/3110.3.72.108 – 10.3.72.10910.3.72.109
5610.3.72.110/3110.3.72.110 – 10.3.72.11110.3.72.111
5710.3.72.112/3110.3.72.112 – 10.3.72.11310.3.72.113
5810.3.72.114/3110.3.72.114 – 10.3.72.11510.3.72.115
5910.3.72.116/3110.3.72.116 – 10.3.72.11710.3.72.117
6010.3.72.118/3110.3.72.118 – 10.3.72.11910.3.72.119
6110.3.72.120/3110.3.72.120 – 10.3.72.12110.3.72.121
6210.3.72.122/3110.3.72.122 – 10.3.72.12310.3.72.123
6310.3.72.124/3110.3.72.124 – 10.3.72.12510.3.72.125
6410.3.72.126/3110.3.72.126 – 10.3.72.12710.3.72.127
6510.3.72.128/3110.3.72.128 – 10.3.72.12910.3.72.129
6610.3.72.130/3110.3.72.130 – 10.3.72.13110.3.72.131
6710.3.72.132/3110.3.72.132 – 10.3.72.13310.3.72.133
6810.3.72.134/3110.3.72.134 – 10.3.72.13510.3.72.135
6910.3.72.136/3110.3.72.136 – 10.3.72.13710.3.72.137
7010.3.72.138/3110.3.72.138 – 10.3.72.13910.3.72.139
7110.3.72.140/3110.3.72.140 – 10.3.72.14110.3.72.141
7210.3.72.142/3110.3.72.142 – 10.3.72.14310.3.72.143
7310.3.72.144/3110.3.72.144 – 10.3.72.14510.3.72.145
7410.3.72.146/3110.3.72.146 – 10.3.72.14710.3.72.147
7510.3.72.148/3110.3.72.148 – 10.3.72.14910.3.72.149
7610.3.72.150/3110.3.72.150 – 10.3.72.15110.3.72.151
7710.3.72.152/3110.3.72.152 – 10.3.72.15310.3.72.153
7810.3.72.154/3110.3.72.154 – 10.3.72.15510.3.72.155
7910.3.72.156/3110.3.72.156 – 10.3.72.15710.3.72.157
8010.3.72.158/3110.3.72.158 – 10.3.72.15910.3.72.159
8110.3.72.160/3110.3.72.160 – 10.3.72.16110.3.72.161
8210.3.72.162/3110.3.72.162 – 10.3.72.16310.3.72.163
8310.3.72.164/3110.3.72.164 – 10.3.72.16510.3.72.165
8410.3.72.166/3110.3.72.166 – 10.3.72.16710.3.72.167
8510.3.72.168/3110.3.72.168 – 10.3.72.16910.3.72.169
8610.3.72.170/3110.3.72.170 – 10.3.72.17110.3.72.171
8710.3.72.172/3110.3.72.172 – 10.3.72.17310.3.72.173
8810.3.72.174/3110.3.72.174 – 10.3.72.17510.3.72.175
8910.3.72.176/3110.3.72.176 – 10.3.72.17710.3.72.177
9010.3.72.178/3110.3.72.178 – 10.3.72.17910.3.72.179
9110.3.72.180/3110.3.72.180 – 10.3.72.18110.3.72.181
9210.3.72.182/3110.3.72.182 – 10.3.72.18310.3.72.183
9310.3.72.184/3110.3.72.184 – 10.3.72.18510.3.72.185
9410.3.72.186/3110.3.72.186 – 10.3.72.18710.3.72.187
9510.3.72.188/3110.3.72.188 – 10.3.72.18910.3.72.189
9610.3.72.190/3110.3.72.190 – 10.3.72.19110.3.72.191
9710.3.72.192/3110.3.72.192 – 10.3.72.19310.3.72.193
9810.3.72.194/3110.3.72.194 – 10.3.72.19510.3.72.195
9910.3.72.196/3110.3.72.196 – 10.3.72.19710.3.72.197
10010.3.72.198/3110.3.72.198 – 10.3.72.19910.3.72.199
10110.3.72.200/3110.3.72.200 – 10.3.72.20110.3.72.201
10210.3.72.202/3110.3.72.202 – 10.3.72.20310.3.72.203
10310.3.72.204/3110.3.72.204 – 10.3.72.20510.3.72.205
10410.3.72.206/3110.3.72.206 – 10.3.72.20710.3.72.207
10510.3.72.208/3110.3.72.208 – 10.3.72.20910.3.72.209
10610.3.72.210/3110.3.72.210 – 10.3.72.21110.3.72.211
10710.3.72.212/3110.3.72.212 – 10.3.72.21310.3.72.213
10810.3.72.214/3110.3.72.214 – 10.3.72.21510.3.72.215
10910.3.72.216/3110.3.72.216 – 10.3.72.21710.3.72.217
11010.3.72.218/3110.3.72.218 – 10.3.72.21910.3.72.219
11110.3.72.220/3110.3.72.220 – 10.3.72.22110.3.72.221
11210.3.72.222/3110.3.72.222 – 10.3.72.22310.3.72.223
11310.3.72.224/3110.3.72.224 – 10.3.72.22510.3.72.225
11410.3.72.226/3110.3.72.226 – 10.3.72.22710.3.72.227
11510.3.72.228/3110.3.72.228 – 10.3.72.22910.3.72.229
11610.3.72.230/3110.3.72.230 – 10.3.72.23110.3.72.231
11710.3.72.232/3110.3.72.232 – 10.3.72.23310.3.72.233
11810.3.72.234/3110.3.72.234 – 10.3.72.23510.3.72.235
11910.3.72.236/3110.3.72.236 – 10.3.72.23710.3.72.237
12010.3.72.238/3110.3.72.238 – 10.3.72.23910.3.72.239
12110.3.72.240/3110.3.72.240 – 10.3.72.24110.3.72.241
12210.3.72.242/3110.3.72.242 – 10.3.72.24310.3.72.243
12310.3.72.244/3110.3.72.244 – 10.3.72.24510.3.72.245
12410.3.72.246/3110.3.72.246 – 10.3.72.24710.3.72.247
12510.3.72.248/3110.3.72.248 – 10.3.72.24910.3.72.249
12610.3.72.250/3110.3.72.250 – 10.3.72.25110.3.72.251
12710.3.72.252/3110.3.72.252 – 10.3.72.25310.3.72.253
12810.3.72.254/3110.3.72.254 – 10.3.72.25510.3.72.255
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 →