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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)10.2.86.128/25
network10.2.86.128/25
broadcast10.2.86.255
first host10.2.86.129
last host10.2.86.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.86.128/25
address00001010.00000010.01010110.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01010110.10000000
broadcast00001010.00000010.01010110.11111111
green = network part, grey = host part
hex0x0a025680
decimal167925376
reverse dns128.86.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5680

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.86.128/3110.2.86.128 – 10.2.86.12910.2.86.129
210.2.86.130/3110.2.86.130 – 10.2.86.13110.2.86.131
310.2.86.132/3110.2.86.132 – 10.2.86.13310.2.86.133
410.2.86.134/3110.2.86.134 – 10.2.86.13510.2.86.135
510.2.86.136/3110.2.86.136 – 10.2.86.13710.2.86.137
610.2.86.138/3110.2.86.138 – 10.2.86.13910.2.86.139
710.2.86.140/3110.2.86.140 – 10.2.86.14110.2.86.141
810.2.86.142/3110.2.86.142 – 10.2.86.14310.2.86.143
910.2.86.144/3110.2.86.144 – 10.2.86.14510.2.86.145
1010.2.86.146/3110.2.86.146 – 10.2.86.14710.2.86.147
1110.2.86.148/3110.2.86.148 – 10.2.86.14910.2.86.149
1210.2.86.150/3110.2.86.150 – 10.2.86.15110.2.86.151
1310.2.86.152/3110.2.86.152 – 10.2.86.15310.2.86.153
1410.2.86.154/3110.2.86.154 – 10.2.86.15510.2.86.155
1510.2.86.156/3110.2.86.156 – 10.2.86.15710.2.86.157
1610.2.86.158/3110.2.86.158 – 10.2.86.15910.2.86.159
1710.2.86.160/3110.2.86.160 – 10.2.86.16110.2.86.161
1810.2.86.162/3110.2.86.162 – 10.2.86.16310.2.86.163
1910.2.86.164/3110.2.86.164 – 10.2.86.16510.2.86.165
2010.2.86.166/3110.2.86.166 – 10.2.86.16710.2.86.167
2110.2.86.168/3110.2.86.168 – 10.2.86.16910.2.86.169
2210.2.86.170/3110.2.86.170 – 10.2.86.17110.2.86.171
2310.2.86.172/3110.2.86.172 – 10.2.86.17310.2.86.173
2410.2.86.174/3110.2.86.174 – 10.2.86.17510.2.86.175
2510.2.86.176/3110.2.86.176 – 10.2.86.17710.2.86.177
2610.2.86.178/3110.2.86.178 – 10.2.86.17910.2.86.179
2710.2.86.180/3110.2.86.180 – 10.2.86.18110.2.86.181
2810.2.86.182/3110.2.86.182 – 10.2.86.18310.2.86.183
2910.2.86.184/3110.2.86.184 – 10.2.86.18510.2.86.185
3010.2.86.186/3110.2.86.186 – 10.2.86.18710.2.86.187
3110.2.86.188/3110.2.86.188 – 10.2.86.18910.2.86.189
3210.2.86.190/3110.2.86.190 – 10.2.86.19110.2.86.191
3310.2.86.192/3110.2.86.192 – 10.2.86.19310.2.86.193
3410.2.86.194/3110.2.86.194 – 10.2.86.19510.2.86.195
3510.2.86.196/3110.2.86.196 – 10.2.86.19710.2.86.197
3610.2.86.198/3110.2.86.198 – 10.2.86.19910.2.86.199
3710.2.86.200/3110.2.86.200 – 10.2.86.20110.2.86.201
3810.2.86.202/3110.2.86.202 – 10.2.86.20310.2.86.203
3910.2.86.204/3110.2.86.204 – 10.2.86.20510.2.86.205
4010.2.86.206/3110.2.86.206 – 10.2.86.20710.2.86.207
4110.2.86.208/3110.2.86.208 – 10.2.86.20910.2.86.209
4210.2.86.210/3110.2.86.210 – 10.2.86.21110.2.86.211
4310.2.86.212/3110.2.86.212 – 10.2.86.21310.2.86.213
4410.2.86.214/3110.2.86.214 – 10.2.86.21510.2.86.215
4510.2.86.216/3110.2.86.216 – 10.2.86.21710.2.86.217
4610.2.86.218/3110.2.86.218 – 10.2.86.21910.2.86.219
4710.2.86.220/3110.2.86.220 – 10.2.86.22110.2.86.221
4810.2.86.222/3110.2.86.222 – 10.2.86.22310.2.86.223
4910.2.86.224/3110.2.86.224 – 10.2.86.22510.2.86.225
5010.2.86.226/3110.2.86.226 – 10.2.86.22710.2.86.227
5110.2.86.228/3110.2.86.228 – 10.2.86.22910.2.86.229
5210.2.86.230/3110.2.86.230 – 10.2.86.23110.2.86.231
5310.2.86.232/3110.2.86.232 – 10.2.86.23310.2.86.233
5410.2.86.234/3110.2.86.234 – 10.2.86.23510.2.86.235
5510.2.86.236/3110.2.86.236 – 10.2.86.23710.2.86.237
5610.2.86.238/3110.2.86.238 – 10.2.86.23910.2.86.239
5710.2.86.240/3110.2.86.240 – 10.2.86.24110.2.86.241
5810.2.86.242/3110.2.86.242 – 10.2.86.24310.2.86.243
5910.2.86.244/3110.2.86.244 – 10.2.86.24510.2.86.245
6010.2.86.246/3110.2.86.246 – 10.2.86.24710.2.86.247
6110.2.86.248/3110.2.86.248 – 10.2.86.24910.2.86.249
6210.2.86.250/3110.2.86.250 – 10.2.86.25110.2.86.251
6310.2.86.252/3110.2.86.252 – 10.2.86.25310.2.86.253
6410.2.86.254/3110.2.86.254 – 10.2.86.25510.2.86.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /25
/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-
/24255.255.255.0256254-
/25255.255.255.1281281261
/26255.255.255.19264622 split →
/27255.255.255.22432304 split →
/28255.255.255.24016148 split →
/29255.255.255.2488616 split →
/30255.255.255.2524232 split →
/31255.255.255.2542264 split →
/32255.255.255.25511128 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 →