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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)10.0.87.128/25
network10.0.87.128/25
broadcast10.0.87.255
first host10.0.87.129
last host10.0.87.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.87.128/25
address00001010.00000000.01010111.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.01010111.10000000
broadcast00001010.00000000.01010111.11111111
green = network part, grey = host part
hex0x0a005780
decimal167794560
reverse dns128.87.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:5780

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.87.128/3110.0.87.128 – 10.0.87.12910.0.87.129
210.0.87.130/3110.0.87.130 – 10.0.87.13110.0.87.131
310.0.87.132/3110.0.87.132 – 10.0.87.13310.0.87.133
410.0.87.134/3110.0.87.134 – 10.0.87.13510.0.87.135
510.0.87.136/3110.0.87.136 – 10.0.87.13710.0.87.137
610.0.87.138/3110.0.87.138 – 10.0.87.13910.0.87.139
710.0.87.140/3110.0.87.140 – 10.0.87.14110.0.87.141
810.0.87.142/3110.0.87.142 – 10.0.87.14310.0.87.143
910.0.87.144/3110.0.87.144 – 10.0.87.14510.0.87.145
1010.0.87.146/3110.0.87.146 – 10.0.87.14710.0.87.147
1110.0.87.148/3110.0.87.148 – 10.0.87.14910.0.87.149
1210.0.87.150/3110.0.87.150 – 10.0.87.15110.0.87.151
1310.0.87.152/3110.0.87.152 – 10.0.87.15310.0.87.153
1410.0.87.154/3110.0.87.154 – 10.0.87.15510.0.87.155
1510.0.87.156/3110.0.87.156 – 10.0.87.15710.0.87.157
1610.0.87.158/3110.0.87.158 – 10.0.87.15910.0.87.159
1710.0.87.160/3110.0.87.160 – 10.0.87.16110.0.87.161
1810.0.87.162/3110.0.87.162 – 10.0.87.16310.0.87.163
1910.0.87.164/3110.0.87.164 – 10.0.87.16510.0.87.165
2010.0.87.166/3110.0.87.166 – 10.0.87.16710.0.87.167
2110.0.87.168/3110.0.87.168 – 10.0.87.16910.0.87.169
2210.0.87.170/3110.0.87.170 – 10.0.87.17110.0.87.171
2310.0.87.172/3110.0.87.172 – 10.0.87.17310.0.87.173
2410.0.87.174/3110.0.87.174 – 10.0.87.17510.0.87.175
2510.0.87.176/3110.0.87.176 – 10.0.87.17710.0.87.177
2610.0.87.178/3110.0.87.178 – 10.0.87.17910.0.87.179
2710.0.87.180/3110.0.87.180 – 10.0.87.18110.0.87.181
2810.0.87.182/3110.0.87.182 – 10.0.87.18310.0.87.183
2910.0.87.184/3110.0.87.184 – 10.0.87.18510.0.87.185
3010.0.87.186/3110.0.87.186 – 10.0.87.18710.0.87.187
3110.0.87.188/3110.0.87.188 – 10.0.87.18910.0.87.189
3210.0.87.190/3110.0.87.190 – 10.0.87.19110.0.87.191
3310.0.87.192/3110.0.87.192 – 10.0.87.19310.0.87.193
3410.0.87.194/3110.0.87.194 – 10.0.87.19510.0.87.195
3510.0.87.196/3110.0.87.196 – 10.0.87.19710.0.87.197
3610.0.87.198/3110.0.87.198 – 10.0.87.19910.0.87.199
3710.0.87.200/3110.0.87.200 – 10.0.87.20110.0.87.201
3810.0.87.202/3110.0.87.202 – 10.0.87.20310.0.87.203
3910.0.87.204/3110.0.87.204 – 10.0.87.20510.0.87.205
4010.0.87.206/3110.0.87.206 – 10.0.87.20710.0.87.207
4110.0.87.208/3110.0.87.208 – 10.0.87.20910.0.87.209
4210.0.87.210/3110.0.87.210 – 10.0.87.21110.0.87.211
4310.0.87.212/3110.0.87.212 – 10.0.87.21310.0.87.213
4410.0.87.214/3110.0.87.214 – 10.0.87.21510.0.87.215
4510.0.87.216/3110.0.87.216 – 10.0.87.21710.0.87.217
4610.0.87.218/3110.0.87.218 – 10.0.87.21910.0.87.219
4710.0.87.220/3110.0.87.220 – 10.0.87.22110.0.87.221
4810.0.87.222/3110.0.87.222 – 10.0.87.22310.0.87.223
4910.0.87.224/3110.0.87.224 – 10.0.87.22510.0.87.225
5010.0.87.226/3110.0.87.226 – 10.0.87.22710.0.87.227
5110.0.87.228/3110.0.87.228 – 10.0.87.22910.0.87.229
5210.0.87.230/3110.0.87.230 – 10.0.87.23110.0.87.231
5310.0.87.232/3110.0.87.232 – 10.0.87.23310.0.87.233
5410.0.87.234/3110.0.87.234 – 10.0.87.23510.0.87.235
5510.0.87.236/3110.0.87.236 – 10.0.87.23710.0.87.237
5610.0.87.238/3110.0.87.238 – 10.0.87.23910.0.87.239
5710.0.87.240/3110.0.87.240 – 10.0.87.24110.0.87.241
5810.0.87.242/3110.0.87.242 – 10.0.87.24310.0.87.243
5910.0.87.244/3110.0.87.244 – 10.0.87.24510.0.87.245
6010.0.87.246/3110.0.87.246 – 10.0.87.24710.0.87.247
6110.0.87.248/3110.0.87.248 – 10.0.87.24910.0.87.249
6210.0.87.250/3110.0.87.250 – 10.0.87.25110.0.87.251
6310.0.87.252/3110.0.87.252 – 10.0.87.25310.0.87.253
6410.0.87.254/3110.0.87.254 – 10.0.87.25510.0.87.255
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 →