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)10.0.123.0/24
network10.0.123.0/24
broadcast10.0.123.255
first host10.0.123.1
last host10.0.123.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.123.0/24
address00001010.00000000.01111011.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.01111011.00000000
broadcast00001010.00000000.01111011.11111111
green = network part, grey = host part
hex0x0a007b00
decimal167803648
reverse dns0.123.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:7b00

/24 split into /31 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.123.0/3110.0.123.0 – 10.0.123.110.0.123.1
210.0.123.2/3110.0.123.2 – 10.0.123.310.0.123.3
310.0.123.4/3110.0.123.4 – 10.0.123.510.0.123.5
410.0.123.6/3110.0.123.6 – 10.0.123.710.0.123.7
510.0.123.8/3110.0.123.8 – 10.0.123.910.0.123.9
610.0.123.10/3110.0.123.10 – 10.0.123.1110.0.123.11
710.0.123.12/3110.0.123.12 – 10.0.123.1310.0.123.13
810.0.123.14/3110.0.123.14 – 10.0.123.1510.0.123.15
910.0.123.16/3110.0.123.16 – 10.0.123.1710.0.123.17
1010.0.123.18/3110.0.123.18 – 10.0.123.1910.0.123.19
1110.0.123.20/3110.0.123.20 – 10.0.123.2110.0.123.21
1210.0.123.22/3110.0.123.22 – 10.0.123.2310.0.123.23
1310.0.123.24/3110.0.123.24 – 10.0.123.2510.0.123.25
1410.0.123.26/3110.0.123.26 – 10.0.123.2710.0.123.27
1510.0.123.28/3110.0.123.28 – 10.0.123.2910.0.123.29
1610.0.123.30/3110.0.123.30 – 10.0.123.3110.0.123.31
1710.0.123.32/3110.0.123.32 – 10.0.123.3310.0.123.33
1810.0.123.34/3110.0.123.34 – 10.0.123.3510.0.123.35
1910.0.123.36/3110.0.123.36 – 10.0.123.3710.0.123.37
2010.0.123.38/3110.0.123.38 – 10.0.123.3910.0.123.39
2110.0.123.40/3110.0.123.40 – 10.0.123.4110.0.123.41
2210.0.123.42/3110.0.123.42 – 10.0.123.4310.0.123.43
2310.0.123.44/3110.0.123.44 – 10.0.123.4510.0.123.45
2410.0.123.46/3110.0.123.46 – 10.0.123.4710.0.123.47
2510.0.123.48/3110.0.123.48 – 10.0.123.4910.0.123.49
2610.0.123.50/3110.0.123.50 – 10.0.123.5110.0.123.51
2710.0.123.52/3110.0.123.52 – 10.0.123.5310.0.123.53
2810.0.123.54/3110.0.123.54 – 10.0.123.5510.0.123.55
2910.0.123.56/3110.0.123.56 – 10.0.123.5710.0.123.57
3010.0.123.58/3110.0.123.58 – 10.0.123.5910.0.123.59
3110.0.123.60/3110.0.123.60 – 10.0.123.6110.0.123.61
3210.0.123.62/3110.0.123.62 – 10.0.123.6310.0.123.63
3310.0.123.64/3110.0.123.64 – 10.0.123.6510.0.123.65
3410.0.123.66/3110.0.123.66 – 10.0.123.6710.0.123.67
3510.0.123.68/3110.0.123.68 – 10.0.123.6910.0.123.69
3610.0.123.70/3110.0.123.70 – 10.0.123.7110.0.123.71
3710.0.123.72/3110.0.123.72 – 10.0.123.7310.0.123.73
3810.0.123.74/3110.0.123.74 – 10.0.123.7510.0.123.75
3910.0.123.76/3110.0.123.76 – 10.0.123.7710.0.123.77
4010.0.123.78/3110.0.123.78 – 10.0.123.7910.0.123.79
4110.0.123.80/3110.0.123.80 – 10.0.123.8110.0.123.81
4210.0.123.82/3110.0.123.82 – 10.0.123.8310.0.123.83
4310.0.123.84/3110.0.123.84 – 10.0.123.8510.0.123.85
4410.0.123.86/3110.0.123.86 – 10.0.123.8710.0.123.87
4510.0.123.88/3110.0.123.88 – 10.0.123.8910.0.123.89
4610.0.123.90/3110.0.123.90 – 10.0.123.9110.0.123.91
4710.0.123.92/3110.0.123.92 – 10.0.123.9310.0.123.93
4810.0.123.94/3110.0.123.94 – 10.0.123.9510.0.123.95
4910.0.123.96/3110.0.123.96 – 10.0.123.9710.0.123.97
5010.0.123.98/3110.0.123.98 – 10.0.123.9910.0.123.99
5110.0.123.100/3110.0.123.100 – 10.0.123.10110.0.123.101
5210.0.123.102/3110.0.123.102 – 10.0.123.10310.0.123.103
5310.0.123.104/3110.0.123.104 – 10.0.123.10510.0.123.105
5410.0.123.106/3110.0.123.106 – 10.0.123.10710.0.123.107
5510.0.123.108/3110.0.123.108 – 10.0.123.10910.0.123.109
5610.0.123.110/3110.0.123.110 – 10.0.123.11110.0.123.111
5710.0.123.112/3110.0.123.112 – 10.0.123.11310.0.123.113
5810.0.123.114/3110.0.123.114 – 10.0.123.11510.0.123.115
5910.0.123.116/3110.0.123.116 – 10.0.123.11710.0.123.117
6010.0.123.118/3110.0.123.118 – 10.0.123.11910.0.123.119
6110.0.123.120/3110.0.123.120 – 10.0.123.12110.0.123.121
6210.0.123.122/3110.0.123.122 – 10.0.123.12310.0.123.123
6310.0.123.124/3110.0.123.124 – 10.0.123.12510.0.123.125
6410.0.123.126/3110.0.123.126 – 10.0.123.12710.0.123.127
6510.0.123.128/3110.0.123.128 – 10.0.123.12910.0.123.129
6610.0.123.130/3110.0.123.130 – 10.0.123.13110.0.123.131
6710.0.123.132/3110.0.123.132 – 10.0.123.13310.0.123.133
6810.0.123.134/3110.0.123.134 – 10.0.123.13510.0.123.135
6910.0.123.136/3110.0.123.136 – 10.0.123.13710.0.123.137
7010.0.123.138/3110.0.123.138 – 10.0.123.13910.0.123.139
7110.0.123.140/3110.0.123.140 – 10.0.123.14110.0.123.141
7210.0.123.142/3110.0.123.142 – 10.0.123.14310.0.123.143
7310.0.123.144/3110.0.123.144 – 10.0.123.14510.0.123.145
7410.0.123.146/3110.0.123.146 – 10.0.123.14710.0.123.147
7510.0.123.148/3110.0.123.148 – 10.0.123.14910.0.123.149
7610.0.123.150/3110.0.123.150 – 10.0.123.15110.0.123.151
7710.0.123.152/3110.0.123.152 – 10.0.123.15310.0.123.153
7810.0.123.154/3110.0.123.154 – 10.0.123.15510.0.123.155
7910.0.123.156/3110.0.123.156 – 10.0.123.15710.0.123.157
8010.0.123.158/3110.0.123.158 – 10.0.123.15910.0.123.159
8110.0.123.160/3110.0.123.160 – 10.0.123.16110.0.123.161
8210.0.123.162/3110.0.123.162 – 10.0.123.16310.0.123.163
8310.0.123.164/3110.0.123.164 – 10.0.123.16510.0.123.165
8410.0.123.166/3110.0.123.166 – 10.0.123.16710.0.123.167
8510.0.123.168/3110.0.123.168 – 10.0.123.16910.0.123.169
8610.0.123.170/3110.0.123.170 – 10.0.123.17110.0.123.171
8710.0.123.172/3110.0.123.172 – 10.0.123.17310.0.123.173
8810.0.123.174/3110.0.123.174 – 10.0.123.17510.0.123.175
8910.0.123.176/3110.0.123.176 – 10.0.123.17710.0.123.177
9010.0.123.178/3110.0.123.178 – 10.0.123.17910.0.123.179
9110.0.123.180/3110.0.123.180 – 10.0.123.18110.0.123.181
9210.0.123.182/3110.0.123.182 – 10.0.123.18310.0.123.183
9310.0.123.184/3110.0.123.184 – 10.0.123.18510.0.123.185
9410.0.123.186/3110.0.123.186 – 10.0.123.18710.0.123.187
9510.0.123.188/3110.0.123.188 – 10.0.123.18910.0.123.189
9610.0.123.190/3110.0.123.190 – 10.0.123.19110.0.123.191
9710.0.123.192/3110.0.123.192 – 10.0.123.19310.0.123.193
9810.0.123.194/3110.0.123.194 – 10.0.123.19510.0.123.195
9910.0.123.196/3110.0.123.196 – 10.0.123.19710.0.123.197
10010.0.123.198/3110.0.123.198 – 10.0.123.19910.0.123.199
10110.0.123.200/3110.0.123.200 – 10.0.123.20110.0.123.201
10210.0.123.202/3110.0.123.202 – 10.0.123.20310.0.123.203
10310.0.123.204/3110.0.123.204 – 10.0.123.20510.0.123.205
10410.0.123.206/3110.0.123.206 – 10.0.123.20710.0.123.207
10510.0.123.208/3110.0.123.208 – 10.0.123.20910.0.123.209
10610.0.123.210/3110.0.123.210 – 10.0.123.21110.0.123.211
10710.0.123.212/3110.0.123.212 – 10.0.123.21310.0.123.213
10810.0.123.214/3110.0.123.214 – 10.0.123.21510.0.123.215
10910.0.123.216/3110.0.123.216 – 10.0.123.21710.0.123.217
11010.0.123.218/3110.0.123.218 – 10.0.123.21910.0.123.219
11110.0.123.220/3110.0.123.220 – 10.0.123.22110.0.123.221
11210.0.123.222/3110.0.123.222 – 10.0.123.22310.0.123.223
11310.0.123.224/3110.0.123.224 – 10.0.123.22510.0.123.225
11410.0.123.226/3110.0.123.226 – 10.0.123.22710.0.123.227
11510.0.123.228/3110.0.123.228 – 10.0.123.22910.0.123.229
11610.0.123.230/3110.0.123.230 – 10.0.123.23110.0.123.231
11710.0.123.232/3110.0.123.232 – 10.0.123.23310.0.123.233
11810.0.123.234/3110.0.123.234 – 10.0.123.23510.0.123.235
11910.0.123.236/3110.0.123.236 – 10.0.123.23710.0.123.237
12010.0.123.238/3110.0.123.238 – 10.0.123.23910.0.123.239
12110.0.123.240/3110.0.123.240 – 10.0.123.24110.0.123.241
12210.0.123.242/3110.0.123.242 – 10.0.123.24310.0.123.243
12310.0.123.244/3110.0.123.244 – 10.0.123.24510.0.123.245
12410.0.123.246/3110.0.123.246 – 10.0.123.24710.0.123.247
12510.0.123.248/3110.0.123.248 – 10.0.123.24910.0.123.249
12610.0.123.250/3110.0.123.250 – 10.0.123.25110.0.123.251
12710.0.123.252/3110.0.123.252 – 10.0.123.25310.0.123.253
12810.0.123.254/3110.0.123.254 – 10.0.123.25510.0.123.255
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 →