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)10.2.100.0/24
network10.2.100.0/24
broadcast10.2.100.255
first host10.2.100.1
last host10.2.100.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.2.100.0/24
address00001010.00000010.01100100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000010.01100100.00000000
broadcast00001010.00000010.01100100.11111111
green = network part, grey = host part
hex0x0a026400
decimal167928832
reverse dns0.100.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:6400

/24 split into /31 · 128 subnets

close ×
#networkhost rangebroadcast
110.2.100.0/3110.2.100.0 – 10.2.100.110.2.100.1
210.2.100.2/3110.2.100.2 – 10.2.100.310.2.100.3
310.2.100.4/3110.2.100.4 – 10.2.100.510.2.100.5
410.2.100.6/3110.2.100.6 – 10.2.100.710.2.100.7
510.2.100.8/3110.2.100.8 – 10.2.100.910.2.100.9
610.2.100.10/3110.2.100.10 – 10.2.100.1110.2.100.11
710.2.100.12/3110.2.100.12 – 10.2.100.1310.2.100.13
810.2.100.14/3110.2.100.14 – 10.2.100.1510.2.100.15
910.2.100.16/3110.2.100.16 – 10.2.100.1710.2.100.17
1010.2.100.18/3110.2.100.18 – 10.2.100.1910.2.100.19
1110.2.100.20/3110.2.100.20 – 10.2.100.2110.2.100.21
1210.2.100.22/3110.2.100.22 – 10.2.100.2310.2.100.23
1310.2.100.24/3110.2.100.24 – 10.2.100.2510.2.100.25
1410.2.100.26/3110.2.100.26 – 10.2.100.2710.2.100.27
1510.2.100.28/3110.2.100.28 – 10.2.100.2910.2.100.29
1610.2.100.30/3110.2.100.30 – 10.2.100.3110.2.100.31
1710.2.100.32/3110.2.100.32 – 10.2.100.3310.2.100.33
1810.2.100.34/3110.2.100.34 – 10.2.100.3510.2.100.35
1910.2.100.36/3110.2.100.36 – 10.2.100.3710.2.100.37
2010.2.100.38/3110.2.100.38 – 10.2.100.3910.2.100.39
2110.2.100.40/3110.2.100.40 – 10.2.100.4110.2.100.41
2210.2.100.42/3110.2.100.42 – 10.2.100.4310.2.100.43
2310.2.100.44/3110.2.100.44 – 10.2.100.4510.2.100.45
2410.2.100.46/3110.2.100.46 – 10.2.100.4710.2.100.47
2510.2.100.48/3110.2.100.48 – 10.2.100.4910.2.100.49
2610.2.100.50/3110.2.100.50 – 10.2.100.5110.2.100.51
2710.2.100.52/3110.2.100.52 – 10.2.100.5310.2.100.53
2810.2.100.54/3110.2.100.54 – 10.2.100.5510.2.100.55
2910.2.100.56/3110.2.100.56 – 10.2.100.5710.2.100.57
3010.2.100.58/3110.2.100.58 – 10.2.100.5910.2.100.59
3110.2.100.60/3110.2.100.60 – 10.2.100.6110.2.100.61
3210.2.100.62/3110.2.100.62 – 10.2.100.6310.2.100.63
3310.2.100.64/3110.2.100.64 – 10.2.100.6510.2.100.65
3410.2.100.66/3110.2.100.66 – 10.2.100.6710.2.100.67
3510.2.100.68/3110.2.100.68 – 10.2.100.6910.2.100.69
3610.2.100.70/3110.2.100.70 – 10.2.100.7110.2.100.71
3710.2.100.72/3110.2.100.72 – 10.2.100.7310.2.100.73
3810.2.100.74/3110.2.100.74 – 10.2.100.7510.2.100.75
3910.2.100.76/3110.2.100.76 – 10.2.100.7710.2.100.77
4010.2.100.78/3110.2.100.78 – 10.2.100.7910.2.100.79
4110.2.100.80/3110.2.100.80 – 10.2.100.8110.2.100.81
4210.2.100.82/3110.2.100.82 – 10.2.100.8310.2.100.83
4310.2.100.84/3110.2.100.84 – 10.2.100.8510.2.100.85
4410.2.100.86/3110.2.100.86 – 10.2.100.8710.2.100.87
4510.2.100.88/3110.2.100.88 – 10.2.100.8910.2.100.89
4610.2.100.90/3110.2.100.90 – 10.2.100.9110.2.100.91
4710.2.100.92/3110.2.100.92 – 10.2.100.9310.2.100.93
4810.2.100.94/3110.2.100.94 – 10.2.100.9510.2.100.95
4910.2.100.96/3110.2.100.96 – 10.2.100.9710.2.100.97
5010.2.100.98/3110.2.100.98 – 10.2.100.9910.2.100.99
5110.2.100.100/3110.2.100.100 – 10.2.100.10110.2.100.101
5210.2.100.102/3110.2.100.102 – 10.2.100.10310.2.100.103
5310.2.100.104/3110.2.100.104 – 10.2.100.10510.2.100.105
5410.2.100.106/3110.2.100.106 – 10.2.100.10710.2.100.107
5510.2.100.108/3110.2.100.108 – 10.2.100.10910.2.100.109
5610.2.100.110/3110.2.100.110 – 10.2.100.11110.2.100.111
5710.2.100.112/3110.2.100.112 – 10.2.100.11310.2.100.113
5810.2.100.114/3110.2.100.114 – 10.2.100.11510.2.100.115
5910.2.100.116/3110.2.100.116 – 10.2.100.11710.2.100.117
6010.2.100.118/3110.2.100.118 – 10.2.100.11910.2.100.119
6110.2.100.120/3110.2.100.120 – 10.2.100.12110.2.100.121
6210.2.100.122/3110.2.100.122 – 10.2.100.12310.2.100.123
6310.2.100.124/3110.2.100.124 – 10.2.100.12510.2.100.125
6410.2.100.126/3110.2.100.126 – 10.2.100.12710.2.100.127
6510.2.100.128/3110.2.100.128 – 10.2.100.12910.2.100.129
6610.2.100.130/3110.2.100.130 – 10.2.100.13110.2.100.131
6710.2.100.132/3110.2.100.132 – 10.2.100.13310.2.100.133
6810.2.100.134/3110.2.100.134 – 10.2.100.13510.2.100.135
6910.2.100.136/3110.2.100.136 – 10.2.100.13710.2.100.137
7010.2.100.138/3110.2.100.138 – 10.2.100.13910.2.100.139
7110.2.100.140/3110.2.100.140 – 10.2.100.14110.2.100.141
7210.2.100.142/3110.2.100.142 – 10.2.100.14310.2.100.143
7310.2.100.144/3110.2.100.144 – 10.2.100.14510.2.100.145
7410.2.100.146/3110.2.100.146 – 10.2.100.14710.2.100.147
7510.2.100.148/3110.2.100.148 – 10.2.100.14910.2.100.149
7610.2.100.150/3110.2.100.150 – 10.2.100.15110.2.100.151
7710.2.100.152/3110.2.100.152 – 10.2.100.15310.2.100.153
7810.2.100.154/3110.2.100.154 – 10.2.100.15510.2.100.155
7910.2.100.156/3110.2.100.156 – 10.2.100.15710.2.100.157
8010.2.100.158/3110.2.100.158 – 10.2.100.15910.2.100.159
8110.2.100.160/3110.2.100.160 – 10.2.100.16110.2.100.161
8210.2.100.162/3110.2.100.162 – 10.2.100.16310.2.100.163
8310.2.100.164/3110.2.100.164 – 10.2.100.16510.2.100.165
8410.2.100.166/3110.2.100.166 – 10.2.100.16710.2.100.167
8510.2.100.168/3110.2.100.168 – 10.2.100.16910.2.100.169
8610.2.100.170/3110.2.100.170 – 10.2.100.17110.2.100.171
8710.2.100.172/3110.2.100.172 – 10.2.100.17310.2.100.173
8810.2.100.174/3110.2.100.174 – 10.2.100.17510.2.100.175
8910.2.100.176/3110.2.100.176 – 10.2.100.17710.2.100.177
9010.2.100.178/3110.2.100.178 – 10.2.100.17910.2.100.179
9110.2.100.180/3110.2.100.180 – 10.2.100.18110.2.100.181
9210.2.100.182/3110.2.100.182 – 10.2.100.18310.2.100.183
9310.2.100.184/3110.2.100.184 – 10.2.100.18510.2.100.185
9410.2.100.186/3110.2.100.186 – 10.2.100.18710.2.100.187
9510.2.100.188/3110.2.100.188 – 10.2.100.18910.2.100.189
9610.2.100.190/3110.2.100.190 – 10.2.100.19110.2.100.191
9710.2.100.192/3110.2.100.192 – 10.2.100.19310.2.100.193
9810.2.100.194/3110.2.100.194 – 10.2.100.19510.2.100.195
9910.2.100.196/3110.2.100.196 – 10.2.100.19710.2.100.197
10010.2.100.198/3110.2.100.198 – 10.2.100.19910.2.100.199
10110.2.100.200/3110.2.100.200 – 10.2.100.20110.2.100.201
10210.2.100.202/3110.2.100.202 – 10.2.100.20310.2.100.203
10310.2.100.204/3110.2.100.204 – 10.2.100.20510.2.100.205
10410.2.100.206/3110.2.100.206 – 10.2.100.20710.2.100.207
10510.2.100.208/3110.2.100.208 – 10.2.100.20910.2.100.209
10610.2.100.210/3110.2.100.210 – 10.2.100.21110.2.100.211
10710.2.100.212/3110.2.100.212 – 10.2.100.21310.2.100.213
10810.2.100.214/3110.2.100.214 – 10.2.100.21510.2.100.215
10910.2.100.216/3110.2.100.216 – 10.2.100.21710.2.100.217
11010.2.100.218/3110.2.100.218 – 10.2.100.21910.2.100.219
11110.2.100.220/3110.2.100.220 – 10.2.100.22110.2.100.221
11210.2.100.222/3110.2.100.222 – 10.2.100.22310.2.100.223
11310.2.100.224/3110.2.100.224 – 10.2.100.22510.2.100.225
11410.2.100.226/3110.2.100.226 – 10.2.100.22710.2.100.227
11510.2.100.228/3110.2.100.228 – 10.2.100.22910.2.100.229
11610.2.100.230/3110.2.100.230 – 10.2.100.23110.2.100.231
11710.2.100.232/3110.2.100.232 – 10.2.100.23310.2.100.233
11810.2.100.234/3110.2.100.234 – 10.2.100.23510.2.100.235
11910.2.100.236/3110.2.100.236 – 10.2.100.23710.2.100.237
12010.2.100.238/3110.2.100.238 – 10.2.100.23910.2.100.239
12110.2.100.240/3110.2.100.240 – 10.2.100.24110.2.100.241
12210.2.100.242/3110.2.100.242 – 10.2.100.24310.2.100.243
12310.2.100.244/3110.2.100.244 – 10.2.100.24510.2.100.245
12410.2.100.246/3110.2.100.246 – 10.2.100.24710.2.100.247
12510.2.100.248/3110.2.100.248 – 10.2.100.24910.2.100.249
12610.2.100.250/3110.2.100.250 – 10.2.100.25110.2.100.251
12710.2.100.252/3110.2.100.252 – 10.2.100.25310.2.100.253
12810.2.100.254/3110.2.100.254 – 10.2.100.25510.2.100.255
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 →