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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)10.5.2.128/25
network10.5.2.128/25
broadcast10.5.2.255
first host10.5.2.129
last host10.5.2.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.5.2.128/25
address00001010.00000101.00000010.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000101.00000010.10000000
broadcast00001010.00000101.00000010.11111111
green = network part, grey = host part
hex0x0a050280
decimal168100480
reverse dns128.2.5.10.in-addr.arpa
ipv4-mapped::ffff:a05:280

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.5.2.128/3110.5.2.128 – 10.5.2.12910.5.2.129
210.5.2.130/3110.5.2.130 – 10.5.2.13110.5.2.131
310.5.2.132/3110.5.2.132 – 10.5.2.13310.5.2.133
410.5.2.134/3110.5.2.134 – 10.5.2.13510.5.2.135
510.5.2.136/3110.5.2.136 – 10.5.2.13710.5.2.137
610.5.2.138/3110.5.2.138 – 10.5.2.13910.5.2.139
710.5.2.140/3110.5.2.140 – 10.5.2.14110.5.2.141
810.5.2.142/3110.5.2.142 – 10.5.2.14310.5.2.143
910.5.2.144/3110.5.2.144 – 10.5.2.14510.5.2.145
1010.5.2.146/3110.5.2.146 – 10.5.2.14710.5.2.147
1110.5.2.148/3110.5.2.148 – 10.5.2.14910.5.2.149
1210.5.2.150/3110.5.2.150 – 10.5.2.15110.5.2.151
1310.5.2.152/3110.5.2.152 – 10.5.2.15310.5.2.153
1410.5.2.154/3110.5.2.154 – 10.5.2.15510.5.2.155
1510.5.2.156/3110.5.2.156 – 10.5.2.15710.5.2.157
1610.5.2.158/3110.5.2.158 – 10.5.2.15910.5.2.159
1710.5.2.160/3110.5.2.160 – 10.5.2.16110.5.2.161
1810.5.2.162/3110.5.2.162 – 10.5.2.16310.5.2.163
1910.5.2.164/3110.5.2.164 – 10.5.2.16510.5.2.165
2010.5.2.166/3110.5.2.166 – 10.5.2.16710.5.2.167
2110.5.2.168/3110.5.2.168 – 10.5.2.16910.5.2.169
2210.5.2.170/3110.5.2.170 – 10.5.2.17110.5.2.171
2310.5.2.172/3110.5.2.172 – 10.5.2.17310.5.2.173
2410.5.2.174/3110.5.2.174 – 10.5.2.17510.5.2.175
2510.5.2.176/3110.5.2.176 – 10.5.2.17710.5.2.177
2610.5.2.178/3110.5.2.178 – 10.5.2.17910.5.2.179
2710.5.2.180/3110.5.2.180 – 10.5.2.18110.5.2.181
2810.5.2.182/3110.5.2.182 – 10.5.2.18310.5.2.183
2910.5.2.184/3110.5.2.184 – 10.5.2.18510.5.2.185
3010.5.2.186/3110.5.2.186 – 10.5.2.18710.5.2.187
3110.5.2.188/3110.5.2.188 – 10.5.2.18910.5.2.189
3210.5.2.190/3110.5.2.190 – 10.5.2.19110.5.2.191
3310.5.2.192/3110.5.2.192 – 10.5.2.19310.5.2.193
3410.5.2.194/3110.5.2.194 – 10.5.2.19510.5.2.195
3510.5.2.196/3110.5.2.196 – 10.5.2.19710.5.2.197
3610.5.2.198/3110.5.2.198 – 10.5.2.19910.5.2.199
3710.5.2.200/3110.5.2.200 – 10.5.2.20110.5.2.201
3810.5.2.202/3110.5.2.202 – 10.5.2.20310.5.2.203
3910.5.2.204/3110.5.2.204 – 10.5.2.20510.5.2.205
4010.5.2.206/3110.5.2.206 – 10.5.2.20710.5.2.207
4110.5.2.208/3110.5.2.208 – 10.5.2.20910.5.2.209
4210.5.2.210/3110.5.2.210 – 10.5.2.21110.5.2.211
4310.5.2.212/3110.5.2.212 – 10.5.2.21310.5.2.213
4410.5.2.214/3110.5.2.214 – 10.5.2.21510.5.2.215
4510.5.2.216/3110.5.2.216 – 10.5.2.21710.5.2.217
4610.5.2.218/3110.5.2.218 – 10.5.2.21910.5.2.219
4710.5.2.220/3110.5.2.220 – 10.5.2.22110.5.2.221
4810.5.2.222/3110.5.2.222 – 10.5.2.22310.5.2.223
4910.5.2.224/3110.5.2.224 – 10.5.2.22510.5.2.225
5010.5.2.226/3110.5.2.226 – 10.5.2.22710.5.2.227
5110.5.2.228/3110.5.2.228 – 10.5.2.22910.5.2.229
5210.5.2.230/3110.5.2.230 – 10.5.2.23110.5.2.231
5310.5.2.232/3110.5.2.232 – 10.5.2.23310.5.2.233
5410.5.2.234/3110.5.2.234 – 10.5.2.23510.5.2.235
5510.5.2.236/3110.5.2.236 – 10.5.2.23710.5.2.237
5610.5.2.238/3110.5.2.238 – 10.5.2.23910.5.2.239
5710.5.2.240/3110.5.2.240 – 10.5.2.24110.5.2.241
5810.5.2.242/3110.5.2.242 – 10.5.2.24310.5.2.243
5910.5.2.244/3110.5.2.244 – 10.5.2.24510.5.2.245
6010.5.2.246/3110.5.2.246 – 10.5.2.24710.5.2.247
6110.5.2.248/3110.5.2.248 – 10.5.2.24910.5.2.249
6210.5.2.250/3110.5.2.250 – 10.5.2.25110.5.2.251
6310.5.2.252/3110.5.2.252 – 10.5.2.25310.5.2.253
6410.5.2.254/3110.5.2.254 – 10.5.2.25510.5.2.255
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 →