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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)10.140.84.128/25
network10.140.84.128/25
broadcast10.140.84.255
first host10.140.84.129
last host10.140.84.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.140.84.128/25
address00001010.10001100.01010100.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10001100.01010100.10000000
broadcast00001010.10001100.01010100.11111111
green = network part, grey = host part
hex0x0a8c5480
decimal176968832
reverse dns128.84.140.10.in-addr.arpa
ipv4-mapped::ffff:a8c:5480

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.140.84.128/3110.140.84.128 – 10.140.84.12910.140.84.129
210.140.84.130/3110.140.84.130 – 10.140.84.13110.140.84.131
310.140.84.132/3110.140.84.132 – 10.140.84.13310.140.84.133
410.140.84.134/3110.140.84.134 – 10.140.84.13510.140.84.135
510.140.84.136/3110.140.84.136 – 10.140.84.13710.140.84.137
610.140.84.138/3110.140.84.138 – 10.140.84.13910.140.84.139
710.140.84.140/3110.140.84.140 – 10.140.84.14110.140.84.141
810.140.84.142/3110.140.84.142 – 10.140.84.14310.140.84.143
910.140.84.144/3110.140.84.144 – 10.140.84.14510.140.84.145
1010.140.84.146/3110.140.84.146 – 10.140.84.14710.140.84.147
1110.140.84.148/3110.140.84.148 – 10.140.84.14910.140.84.149
1210.140.84.150/3110.140.84.150 – 10.140.84.15110.140.84.151
1310.140.84.152/3110.140.84.152 – 10.140.84.15310.140.84.153
1410.140.84.154/3110.140.84.154 – 10.140.84.15510.140.84.155
1510.140.84.156/3110.140.84.156 – 10.140.84.15710.140.84.157
1610.140.84.158/3110.140.84.158 – 10.140.84.15910.140.84.159
1710.140.84.160/3110.140.84.160 – 10.140.84.16110.140.84.161
1810.140.84.162/3110.140.84.162 – 10.140.84.16310.140.84.163
1910.140.84.164/3110.140.84.164 – 10.140.84.16510.140.84.165
2010.140.84.166/3110.140.84.166 – 10.140.84.16710.140.84.167
2110.140.84.168/3110.140.84.168 – 10.140.84.16910.140.84.169
2210.140.84.170/3110.140.84.170 – 10.140.84.17110.140.84.171
2310.140.84.172/3110.140.84.172 – 10.140.84.17310.140.84.173
2410.140.84.174/3110.140.84.174 – 10.140.84.17510.140.84.175
2510.140.84.176/3110.140.84.176 – 10.140.84.17710.140.84.177
2610.140.84.178/3110.140.84.178 – 10.140.84.17910.140.84.179
2710.140.84.180/3110.140.84.180 – 10.140.84.18110.140.84.181
2810.140.84.182/3110.140.84.182 – 10.140.84.18310.140.84.183
2910.140.84.184/3110.140.84.184 – 10.140.84.18510.140.84.185
3010.140.84.186/3110.140.84.186 – 10.140.84.18710.140.84.187
3110.140.84.188/3110.140.84.188 – 10.140.84.18910.140.84.189
3210.140.84.190/3110.140.84.190 – 10.140.84.19110.140.84.191
3310.140.84.192/3110.140.84.192 – 10.140.84.19310.140.84.193
3410.140.84.194/3110.140.84.194 – 10.140.84.19510.140.84.195
3510.140.84.196/3110.140.84.196 – 10.140.84.19710.140.84.197
3610.140.84.198/3110.140.84.198 – 10.140.84.19910.140.84.199
3710.140.84.200/3110.140.84.200 – 10.140.84.20110.140.84.201
3810.140.84.202/3110.140.84.202 – 10.140.84.20310.140.84.203
3910.140.84.204/3110.140.84.204 – 10.140.84.20510.140.84.205
4010.140.84.206/3110.140.84.206 – 10.140.84.20710.140.84.207
4110.140.84.208/3110.140.84.208 – 10.140.84.20910.140.84.209
4210.140.84.210/3110.140.84.210 – 10.140.84.21110.140.84.211
4310.140.84.212/3110.140.84.212 – 10.140.84.21310.140.84.213
4410.140.84.214/3110.140.84.214 – 10.140.84.21510.140.84.215
4510.140.84.216/3110.140.84.216 – 10.140.84.21710.140.84.217
4610.140.84.218/3110.140.84.218 – 10.140.84.21910.140.84.219
4710.140.84.220/3110.140.84.220 – 10.140.84.22110.140.84.221
4810.140.84.222/3110.140.84.222 – 10.140.84.22310.140.84.223
4910.140.84.224/3110.140.84.224 – 10.140.84.22510.140.84.225
5010.140.84.226/3110.140.84.226 – 10.140.84.22710.140.84.227
5110.140.84.228/3110.140.84.228 – 10.140.84.22910.140.84.229
5210.140.84.230/3110.140.84.230 – 10.140.84.23110.140.84.231
5310.140.84.232/3110.140.84.232 – 10.140.84.23310.140.84.233
5410.140.84.234/3110.140.84.234 – 10.140.84.23510.140.84.235
5510.140.84.236/3110.140.84.236 – 10.140.84.23710.140.84.237
5610.140.84.238/3110.140.84.238 – 10.140.84.23910.140.84.239
5710.140.84.240/3110.140.84.240 – 10.140.84.24110.140.84.241
5810.140.84.242/3110.140.84.242 – 10.140.84.24310.140.84.243
5910.140.84.244/3110.140.84.244 – 10.140.84.24510.140.84.245
6010.140.84.246/3110.140.84.246 – 10.140.84.24710.140.84.247
6110.140.84.248/3110.140.84.248 – 10.140.84.24910.140.84.249
6210.140.84.250/3110.140.84.250 – 10.140.84.25110.140.84.251
6310.140.84.252/3110.140.84.252 – 10.140.84.25310.140.84.253
6410.140.84.254/3110.140.84.254 – 10.140.84.25510.140.84.255
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 →