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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)10.7.3.128/25
network10.7.3.128/25
broadcast10.7.3.255
first host10.7.3.129
last host10.7.3.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.7.3.128/25
address00001010.00000111.00000011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000111.00000011.10000000
broadcast00001010.00000111.00000011.11111111
green = network part, grey = host part
hex0x0a070380
decimal168231808
reverse dns128.3.7.10.in-addr.arpa
ipv4-mapped::ffff:a07:380

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.7.3.128/3110.7.3.128 – 10.7.3.12910.7.3.129
210.7.3.130/3110.7.3.130 – 10.7.3.13110.7.3.131
310.7.3.132/3110.7.3.132 – 10.7.3.13310.7.3.133
410.7.3.134/3110.7.3.134 – 10.7.3.13510.7.3.135
510.7.3.136/3110.7.3.136 – 10.7.3.13710.7.3.137
610.7.3.138/3110.7.3.138 – 10.7.3.13910.7.3.139
710.7.3.140/3110.7.3.140 – 10.7.3.14110.7.3.141
810.7.3.142/3110.7.3.142 – 10.7.3.14310.7.3.143
910.7.3.144/3110.7.3.144 – 10.7.3.14510.7.3.145
1010.7.3.146/3110.7.3.146 – 10.7.3.14710.7.3.147
1110.7.3.148/3110.7.3.148 – 10.7.3.14910.7.3.149
1210.7.3.150/3110.7.3.150 – 10.7.3.15110.7.3.151
1310.7.3.152/3110.7.3.152 – 10.7.3.15310.7.3.153
1410.7.3.154/3110.7.3.154 – 10.7.3.15510.7.3.155
1510.7.3.156/3110.7.3.156 – 10.7.3.15710.7.3.157
1610.7.3.158/3110.7.3.158 – 10.7.3.15910.7.3.159
1710.7.3.160/3110.7.3.160 – 10.7.3.16110.7.3.161
1810.7.3.162/3110.7.3.162 – 10.7.3.16310.7.3.163
1910.7.3.164/3110.7.3.164 – 10.7.3.16510.7.3.165
2010.7.3.166/3110.7.3.166 – 10.7.3.16710.7.3.167
2110.7.3.168/3110.7.3.168 – 10.7.3.16910.7.3.169
2210.7.3.170/3110.7.3.170 – 10.7.3.17110.7.3.171
2310.7.3.172/3110.7.3.172 – 10.7.3.17310.7.3.173
2410.7.3.174/3110.7.3.174 – 10.7.3.17510.7.3.175
2510.7.3.176/3110.7.3.176 – 10.7.3.17710.7.3.177
2610.7.3.178/3110.7.3.178 – 10.7.3.17910.7.3.179
2710.7.3.180/3110.7.3.180 – 10.7.3.18110.7.3.181
2810.7.3.182/3110.7.3.182 – 10.7.3.18310.7.3.183
2910.7.3.184/3110.7.3.184 – 10.7.3.18510.7.3.185
3010.7.3.186/3110.7.3.186 – 10.7.3.18710.7.3.187
3110.7.3.188/3110.7.3.188 – 10.7.3.18910.7.3.189
3210.7.3.190/3110.7.3.190 – 10.7.3.19110.7.3.191
3310.7.3.192/3110.7.3.192 – 10.7.3.19310.7.3.193
3410.7.3.194/3110.7.3.194 – 10.7.3.19510.7.3.195
3510.7.3.196/3110.7.3.196 – 10.7.3.19710.7.3.197
3610.7.3.198/3110.7.3.198 – 10.7.3.19910.7.3.199
3710.7.3.200/3110.7.3.200 – 10.7.3.20110.7.3.201
3810.7.3.202/3110.7.3.202 – 10.7.3.20310.7.3.203
3910.7.3.204/3110.7.3.204 – 10.7.3.20510.7.3.205
4010.7.3.206/3110.7.3.206 – 10.7.3.20710.7.3.207
4110.7.3.208/3110.7.3.208 – 10.7.3.20910.7.3.209
4210.7.3.210/3110.7.3.210 – 10.7.3.21110.7.3.211
4310.7.3.212/3110.7.3.212 – 10.7.3.21310.7.3.213
4410.7.3.214/3110.7.3.214 – 10.7.3.21510.7.3.215
4510.7.3.216/3110.7.3.216 – 10.7.3.21710.7.3.217
4610.7.3.218/3110.7.3.218 – 10.7.3.21910.7.3.219
4710.7.3.220/3110.7.3.220 – 10.7.3.22110.7.3.221
4810.7.3.222/3110.7.3.222 – 10.7.3.22310.7.3.223
4910.7.3.224/3110.7.3.224 – 10.7.3.22510.7.3.225
5010.7.3.226/3110.7.3.226 – 10.7.3.22710.7.3.227
5110.7.3.228/3110.7.3.228 – 10.7.3.22910.7.3.229
5210.7.3.230/3110.7.3.230 – 10.7.3.23110.7.3.231
5310.7.3.232/3110.7.3.232 – 10.7.3.23310.7.3.233
5410.7.3.234/3110.7.3.234 – 10.7.3.23510.7.3.235
5510.7.3.236/3110.7.3.236 – 10.7.3.23710.7.3.237
5610.7.3.238/3110.7.3.238 – 10.7.3.23910.7.3.239
5710.7.3.240/3110.7.3.240 – 10.7.3.24110.7.3.241
5810.7.3.242/3110.7.3.242 – 10.7.3.24310.7.3.243
5910.7.3.244/3110.7.3.244 – 10.7.3.24510.7.3.245
6010.7.3.246/3110.7.3.246 – 10.7.3.24710.7.3.247
6110.7.3.248/3110.7.3.248 – 10.7.3.24910.7.3.249
6210.7.3.250/3110.7.3.250 – 10.7.3.25110.7.3.251
6310.7.3.252/3110.7.3.252 – 10.7.3.25310.7.3.253
6410.7.3.254/3110.7.3.254 – 10.7.3.25510.7.3.255
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 →