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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)10.167.99.128/25
network10.167.99.128/25
broadcast10.167.99.255
first host10.167.99.129
last host10.167.99.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.99.128/25
address00001010.10100111.01100011.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.01100011.10000000
broadcast00001010.10100111.01100011.11111111
green = network part, grey = host part
hex0x0aa76380
decimal178742144
reverse dns128.99.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:6380

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.99.128/3110.167.99.128 – 10.167.99.12910.167.99.129
210.167.99.130/3110.167.99.130 – 10.167.99.13110.167.99.131
310.167.99.132/3110.167.99.132 – 10.167.99.13310.167.99.133
410.167.99.134/3110.167.99.134 – 10.167.99.13510.167.99.135
510.167.99.136/3110.167.99.136 – 10.167.99.13710.167.99.137
610.167.99.138/3110.167.99.138 – 10.167.99.13910.167.99.139
710.167.99.140/3110.167.99.140 – 10.167.99.14110.167.99.141
810.167.99.142/3110.167.99.142 – 10.167.99.14310.167.99.143
910.167.99.144/3110.167.99.144 – 10.167.99.14510.167.99.145
1010.167.99.146/3110.167.99.146 – 10.167.99.14710.167.99.147
1110.167.99.148/3110.167.99.148 – 10.167.99.14910.167.99.149
1210.167.99.150/3110.167.99.150 – 10.167.99.15110.167.99.151
1310.167.99.152/3110.167.99.152 – 10.167.99.15310.167.99.153
1410.167.99.154/3110.167.99.154 – 10.167.99.15510.167.99.155
1510.167.99.156/3110.167.99.156 – 10.167.99.15710.167.99.157
1610.167.99.158/3110.167.99.158 – 10.167.99.15910.167.99.159
1710.167.99.160/3110.167.99.160 – 10.167.99.16110.167.99.161
1810.167.99.162/3110.167.99.162 – 10.167.99.16310.167.99.163
1910.167.99.164/3110.167.99.164 – 10.167.99.16510.167.99.165
2010.167.99.166/3110.167.99.166 – 10.167.99.16710.167.99.167
2110.167.99.168/3110.167.99.168 – 10.167.99.16910.167.99.169
2210.167.99.170/3110.167.99.170 – 10.167.99.17110.167.99.171
2310.167.99.172/3110.167.99.172 – 10.167.99.17310.167.99.173
2410.167.99.174/3110.167.99.174 – 10.167.99.17510.167.99.175
2510.167.99.176/3110.167.99.176 – 10.167.99.17710.167.99.177
2610.167.99.178/3110.167.99.178 – 10.167.99.17910.167.99.179
2710.167.99.180/3110.167.99.180 – 10.167.99.18110.167.99.181
2810.167.99.182/3110.167.99.182 – 10.167.99.18310.167.99.183
2910.167.99.184/3110.167.99.184 – 10.167.99.18510.167.99.185
3010.167.99.186/3110.167.99.186 – 10.167.99.18710.167.99.187
3110.167.99.188/3110.167.99.188 – 10.167.99.18910.167.99.189
3210.167.99.190/3110.167.99.190 – 10.167.99.19110.167.99.191
3310.167.99.192/3110.167.99.192 – 10.167.99.19310.167.99.193
3410.167.99.194/3110.167.99.194 – 10.167.99.19510.167.99.195
3510.167.99.196/3110.167.99.196 – 10.167.99.19710.167.99.197
3610.167.99.198/3110.167.99.198 – 10.167.99.19910.167.99.199
3710.167.99.200/3110.167.99.200 – 10.167.99.20110.167.99.201
3810.167.99.202/3110.167.99.202 – 10.167.99.20310.167.99.203
3910.167.99.204/3110.167.99.204 – 10.167.99.20510.167.99.205
4010.167.99.206/3110.167.99.206 – 10.167.99.20710.167.99.207
4110.167.99.208/3110.167.99.208 – 10.167.99.20910.167.99.209
4210.167.99.210/3110.167.99.210 – 10.167.99.21110.167.99.211
4310.167.99.212/3110.167.99.212 – 10.167.99.21310.167.99.213
4410.167.99.214/3110.167.99.214 – 10.167.99.21510.167.99.215
4510.167.99.216/3110.167.99.216 – 10.167.99.21710.167.99.217
4610.167.99.218/3110.167.99.218 – 10.167.99.21910.167.99.219
4710.167.99.220/3110.167.99.220 – 10.167.99.22110.167.99.221
4810.167.99.222/3110.167.99.222 – 10.167.99.22310.167.99.223
4910.167.99.224/3110.167.99.224 – 10.167.99.22510.167.99.225
5010.167.99.226/3110.167.99.226 – 10.167.99.22710.167.99.227
5110.167.99.228/3110.167.99.228 – 10.167.99.22910.167.99.229
5210.167.99.230/3110.167.99.230 – 10.167.99.23110.167.99.231
5310.167.99.232/3110.167.99.232 – 10.167.99.23310.167.99.233
5410.167.99.234/3110.167.99.234 – 10.167.99.23510.167.99.235
5510.167.99.236/3110.167.99.236 – 10.167.99.23710.167.99.237
5610.167.99.238/3110.167.99.238 – 10.167.99.23910.167.99.239
5710.167.99.240/3110.167.99.240 – 10.167.99.24110.167.99.241
5810.167.99.242/3110.167.99.242 – 10.167.99.24310.167.99.243
5910.167.99.244/3110.167.99.244 – 10.167.99.24510.167.99.245
6010.167.99.246/3110.167.99.246 – 10.167.99.24710.167.99.247
6110.167.99.248/3110.167.99.248 – 10.167.99.24910.167.99.249
6210.167.99.250/3110.167.99.250 – 10.167.99.25110.167.99.251
6310.167.99.252/3110.167.99.252 – 10.167.99.25310.167.99.253
6410.167.99.254/3110.167.99.254 – 10.167.99.25510.167.99.255
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 →