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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)10.0.83.128/25
network10.0.83.128/25
broadcast10.0.83.255
first host10.0.83.129
last host10.0.83.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.83.128/25
address00001010.00000000.01010011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.01010011.10000000
broadcast00001010.00000000.01010011.11111111
green = network part, grey = host part
hex0x0a005380
decimal167793536
reverse dns128.83.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:5380

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.83.128/3110.0.83.128 – 10.0.83.12910.0.83.129
210.0.83.130/3110.0.83.130 – 10.0.83.13110.0.83.131
310.0.83.132/3110.0.83.132 – 10.0.83.13310.0.83.133
410.0.83.134/3110.0.83.134 – 10.0.83.13510.0.83.135
510.0.83.136/3110.0.83.136 – 10.0.83.13710.0.83.137
610.0.83.138/3110.0.83.138 – 10.0.83.13910.0.83.139
710.0.83.140/3110.0.83.140 – 10.0.83.14110.0.83.141
810.0.83.142/3110.0.83.142 – 10.0.83.14310.0.83.143
910.0.83.144/3110.0.83.144 – 10.0.83.14510.0.83.145
1010.0.83.146/3110.0.83.146 – 10.0.83.14710.0.83.147
1110.0.83.148/3110.0.83.148 – 10.0.83.14910.0.83.149
1210.0.83.150/3110.0.83.150 – 10.0.83.15110.0.83.151
1310.0.83.152/3110.0.83.152 – 10.0.83.15310.0.83.153
1410.0.83.154/3110.0.83.154 – 10.0.83.15510.0.83.155
1510.0.83.156/3110.0.83.156 – 10.0.83.15710.0.83.157
1610.0.83.158/3110.0.83.158 – 10.0.83.15910.0.83.159
1710.0.83.160/3110.0.83.160 – 10.0.83.16110.0.83.161
1810.0.83.162/3110.0.83.162 – 10.0.83.16310.0.83.163
1910.0.83.164/3110.0.83.164 – 10.0.83.16510.0.83.165
2010.0.83.166/3110.0.83.166 – 10.0.83.16710.0.83.167
2110.0.83.168/3110.0.83.168 – 10.0.83.16910.0.83.169
2210.0.83.170/3110.0.83.170 – 10.0.83.17110.0.83.171
2310.0.83.172/3110.0.83.172 – 10.0.83.17310.0.83.173
2410.0.83.174/3110.0.83.174 – 10.0.83.17510.0.83.175
2510.0.83.176/3110.0.83.176 – 10.0.83.17710.0.83.177
2610.0.83.178/3110.0.83.178 – 10.0.83.17910.0.83.179
2710.0.83.180/3110.0.83.180 – 10.0.83.18110.0.83.181
2810.0.83.182/3110.0.83.182 – 10.0.83.18310.0.83.183
2910.0.83.184/3110.0.83.184 – 10.0.83.18510.0.83.185
3010.0.83.186/3110.0.83.186 – 10.0.83.18710.0.83.187
3110.0.83.188/3110.0.83.188 – 10.0.83.18910.0.83.189
3210.0.83.190/3110.0.83.190 – 10.0.83.19110.0.83.191
3310.0.83.192/3110.0.83.192 – 10.0.83.19310.0.83.193
3410.0.83.194/3110.0.83.194 – 10.0.83.19510.0.83.195
3510.0.83.196/3110.0.83.196 – 10.0.83.19710.0.83.197
3610.0.83.198/3110.0.83.198 – 10.0.83.19910.0.83.199
3710.0.83.200/3110.0.83.200 – 10.0.83.20110.0.83.201
3810.0.83.202/3110.0.83.202 – 10.0.83.20310.0.83.203
3910.0.83.204/3110.0.83.204 – 10.0.83.20510.0.83.205
4010.0.83.206/3110.0.83.206 – 10.0.83.20710.0.83.207
4110.0.83.208/3110.0.83.208 – 10.0.83.20910.0.83.209
4210.0.83.210/3110.0.83.210 – 10.0.83.21110.0.83.211
4310.0.83.212/3110.0.83.212 – 10.0.83.21310.0.83.213
4410.0.83.214/3110.0.83.214 – 10.0.83.21510.0.83.215
4510.0.83.216/3110.0.83.216 – 10.0.83.21710.0.83.217
4610.0.83.218/3110.0.83.218 – 10.0.83.21910.0.83.219
4710.0.83.220/3110.0.83.220 – 10.0.83.22110.0.83.221
4810.0.83.222/3110.0.83.222 – 10.0.83.22310.0.83.223
4910.0.83.224/3110.0.83.224 – 10.0.83.22510.0.83.225
5010.0.83.226/3110.0.83.226 – 10.0.83.22710.0.83.227
5110.0.83.228/3110.0.83.228 – 10.0.83.22910.0.83.229
5210.0.83.230/3110.0.83.230 – 10.0.83.23110.0.83.231
5310.0.83.232/3110.0.83.232 – 10.0.83.23310.0.83.233
5410.0.83.234/3110.0.83.234 – 10.0.83.23510.0.83.235
5510.0.83.236/3110.0.83.236 – 10.0.83.23710.0.83.237
5610.0.83.238/3110.0.83.238 – 10.0.83.23910.0.83.239
5710.0.83.240/3110.0.83.240 – 10.0.83.24110.0.83.241
5810.0.83.242/3110.0.83.242 – 10.0.83.24310.0.83.243
5910.0.83.244/3110.0.83.244 – 10.0.83.24510.0.83.245
6010.0.83.246/3110.0.83.246 – 10.0.83.24710.0.83.247
6110.0.83.248/3110.0.83.248 – 10.0.83.24910.0.83.249
6210.0.83.250/3110.0.83.250 – 10.0.83.25110.0.83.251
6310.0.83.252/3110.0.83.252 – 10.0.83.25310.0.83.253
6410.0.83.254/3110.0.83.254 – 10.0.83.25510.0.83.255
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 →