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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)10.167.49.128/25
network10.167.49.128/25
broadcast10.167.49.255
first host10.167.49.129
last host10.167.49.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.167.49.128/25
address00001010.10100111.00110001.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.10100111.00110001.10000000
broadcast00001010.10100111.00110001.11111111
green = network part, grey = host part
hex0x0aa73180
decimal178729344
reverse dns128.49.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:3180

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.49.128/3110.167.49.128 – 10.167.49.12910.167.49.129
210.167.49.130/3110.167.49.130 – 10.167.49.13110.167.49.131
310.167.49.132/3110.167.49.132 – 10.167.49.13310.167.49.133
410.167.49.134/3110.167.49.134 – 10.167.49.13510.167.49.135
510.167.49.136/3110.167.49.136 – 10.167.49.13710.167.49.137
610.167.49.138/3110.167.49.138 – 10.167.49.13910.167.49.139
710.167.49.140/3110.167.49.140 – 10.167.49.14110.167.49.141
810.167.49.142/3110.167.49.142 – 10.167.49.14310.167.49.143
910.167.49.144/3110.167.49.144 – 10.167.49.14510.167.49.145
1010.167.49.146/3110.167.49.146 – 10.167.49.14710.167.49.147
1110.167.49.148/3110.167.49.148 – 10.167.49.14910.167.49.149
1210.167.49.150/3110.167.49.150 – 10.167.49.15110.167.49.151
1310.167.49.152/3110.167.49.152 – 10.167.49.15310.167.49.153
1410.167.49.154/3110.167.49.154 – 10.167.49.15510.167.49.155
1510.167.49.156/3110.167.49.156 – 10.167.49.15710.167.49.157
1610.167.49.158/3110.167.49.158 – 10.167.49.15910.167.49.159
1710.167.49.160/3110.167.49.160 – 10.167.49.16110.167.49.161
1810.167.49.162/3110.167.49.162 – 10.167.49.16310.167.49.163
1910.167.49.164/3110.167.49.164 – 10.167.49.16510.167.49.165
2010.167.49.166/3110.167.49.166 – 10.167.49.16710.167.49.167
2110.167.49.168/3110.167.49.168 – 10.167.49.16910.167.49.169
2210.167.49.170/3110.167.49.170 – 10.167.49.17110.167.49.171
2310.167.49.172/3110.167.49.172 – 10.167.49.17310.167.49.173
2410.167.49.174/3110.167.49.174 – 10.167.49.17510.167.49.175
2510.167.49.176/3110.167.49.176 – 10.167.49.17710.167.49.177
2610.167.49.178/3110.167.49.178 – 10.167.49.17910.167.49.179
2710.167.49.180/3110.167.49.180 – 10.167.49.18110.167.49.181
2810.167.49.182/3110.167.49.182 – 10.167.49.18310.167.49.183
2910.167.49.184/3110.167.49.184 – 10.167.49.18510.167.49.185
3010.167.49.186/3110.167.49.186 – 10.167.49.18710.167.49.187
3110.167.49.188/3110.167.49.188 – 10.167.49.18910.167.49.189
3210.167.49.190/3110.167.49.190 – 10.167.49.19110.167.49.191
3310.167.49.192/3110.167.49.192 – 10.167.49.19310.167.49.193
3410.167.49.194/3110.167.49.194 – 10.167.49.19510.167.49.195
3510.167.49.196/3110.167.49.196 – 10.167.49.19710.167.49.197
3610.167.49.198/3110.167.49.198 – 10.167.49.19910.167.49.199
3710.167.49.200/3110.167.49.200 – 10.167.49.20110.167.49.201
3810.167.49.202/3110.167.49.202 – 10.167.49.20310.167.49.203
3910.167.49.204/3110.167.49.204 – 10.167.49.20510.167.49.205
4010.167.49.206/3110.167.49.206 – 10.167.49.20710.167.49.207
4110.167.49.208/3110.167.49.208 – 10.167.49.20910.167.49.209
4210.167.49.210/3110.167.49.210 – 10.167.49.21110.167.49.211
4310.167.49.212/3110.167.49.212 – 10.167.49.21310.167.49.213
4410.167.49.214/3110.167.49.214 – 10.167.49.21510.167.49.215
4510.167.49.216/3110.167.49.216 – 10.167.49.21710.167.49.217
4610.167.49.218/3110.167.49.218 – 10.167.49.21910.167.49.219
4710.167.49.220/3110.167.49.220 – 10.167.49.22110.167.49.221
4810.167.49.222/3110.167.49.222 – 10.167.49.22310.167.49.223
4910.167.49.224/3110.167.49.224 – 10.167.49.22510.167.49.225
5010.167.49.226/3110.167.49.226 – 10.167.49.22710.167.49.227
5110.167.49.228/3110.167.49.228 – 10.167.49.22910.167.49.229
5210.167.49.230/3110.167.49.230 – 10.167.49.23110.167.49.231
5310.167.49.232/3110.167.49.232 – 10.167.49.23310.167.49.233
5410.167.49.234/3110.167.49.234 – 10.167.49.23510.167.49.235
5510.167.49.236/3110.167.49.236 – 10.167.49.23710.167.49.237
5610.167.49.238/3110.167.49.238 – 10.167.49.23910.167.49.239
5710.167.49.240/3110.167.49.240 – 10.167.49.24110.167.49.241
5810.167.49.242/3110.167.49.242 – 10.167.49.24310.167.49.243
5910.167.49.244/3110.167.49.244 – 10.167.49.24510.167.49.245
6010.167.49.246/3110.167.49.246 – 10.167.49.24710.167.49.247
6110.167.49.248/3110.167.49.248 – 10.167.49.24910.167.49.249
6210.167.49.250/3110.167.49.250 – 10.167.49.25110.167.49.251
6310.167.49.252/3110.167.49.252 – 10.167.49.25310.167.49.253
6410.167.49.254/3110.167.49.254 – 10.167.49.25510.167.49.255
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 →