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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)10.2.90.128/25
network10.2.90.128/25
broadcast10.2.90.255
first host10.2.90.129
last host10.2.90.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.90.128/25
address00001010.00000010.01011010.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01011010.10000000
broadcast00001010.00000010.01011010.11111111
green = network part, grey = host part
hex0x0a025a80
decimal167926400
reverse dns128.90.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5a80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.90.128/3110.2.90.128 – 10.2.90.12910.2.90.129
210.2.90.130/3110.2.90.130 – 10.2.90.13110.2.90.131
310.2.90.132/3110.2.90.132 – 10.2.90.13310.2.90.133
410.2.90.134/3110.2.90.134 – 10.2.90.13510.2.90.135
510.2.90.136/3110.2.90.136 – 10.2.90.13710.2.90.137
610.2.90.138/3110.2.90.138 – 10.2.90.13910.2.90.139
710.2.90.140/3110.2.90.140 – 10.2.90.14110.2.90.141
810.2.90.142/3110.2.90.142 – 10.2.90.14310.2.90.143
910.2.90.144/3110.2.90.144 – 10.2.90.14510.2.90.145
1010.2.90.146/3110.2.90.146 – 10.2.90.14710.2.90.147
1110.2.90.148/3110.2.90.148 – 10.2.90.14910.2.90.149
1210.2.90.150/3110.2.90.150 – 10.2.90.15110.2.90.151
1310.2.90.152/3110.2.90.152 – 10.2.90.15310.2.90.153
1410.2.90.154/3110.2.90.154 – 10.2.90.15510.2.90.155
1510.2.90.156/3110.2.90.156 – 10.2.90.15710.2.90.157
1610.2.90.158/3110.2.90.158 – 10.2.90.15910.2.90.159
1710.2.90.160/3110.2.90.160 – 10.2.90.16110.2.90.161
1810.2.90.162/3110.2.90.162 – 10.2.90.16310.2.90.163
1910.2.90.164/3110.2.90.164 – 10.2.90.16510.2.90.165
2010.2.90.166/3110.2.90.166 – 10.2.90.16710.2.90.167
2110.2.90.168/3110.2.90.168 – 10.2.90.16910.2.90.169
2210.2.90.170/3110.2.90.170 – 10.2.90.17110.2.90.171
2310.2.90.172/3110.2.90.172 – 10.2.90.17310.2.90.173
2410.2.90.174/3110.2.90.174 – 10.2.90.17510.2.90.175
2510.2.90.176/3110.2.90.176 – 10.2.90.17710.2.90.177
2610.2.90.178/3110.2.90.178 – 10.2.90.17910.2.90.179
2710.2.90.180/3110.2.90.180 – 10.2.90.18110.2.90.181
2810.2.90.182/3110.2.90.182 – 10.2.90.18310.2.90.183
2910.2.90.184/3110.2.90.184 – 10.2.90.18510.2.90.185
3010.2.90.186/3110.2.90.186 – 10.2.90.18710.2.90.187
3110.2.90.188/3110.2.90.188 – 10.2.90.18910.2.90.189
3210.2.90.190/3110.2.90.190 – 10.2.90.19110.2.90.191
3310.2.90.192/3110.2.90.192 – 10.2.90.19310.2.90.193
3410.2.90.194/3110.2.90.194 – 10.2.90.19510.2.90.195
3510.2.90.196/3110.2.90.196 – 10.2.90.19710.2.90.197
3610.2.90.198/3110.2.90.198 – 10.2.90.19910.2.90.199
3710.2.90.200/3110.2.90.200 – 10.2.90.20110.2.90.201
3810.2.90.202/3110.2.90.202 – 10.2.90.20310.2.90.203
3910.2.90.204/3110.2.90.204 – 10.2.90.20510.2.90.205
4010.2.90.206/3110.2.90.206 – 10.2.90.20710.2.90.207
4110.2.90.208/3110.2.90.208 – 10.2.90.20910.2.90.209
4210.2.90.210/3110.2.90.210 – 10.2.90.21110.2.90.211
4310.2.90.212/3110.2.90.212 – 10.2.90.21310.2.90.213
4410.2.90.214/3110.2.90.214 – 10.2.90.21510.2.90.215
4510.2.90.216/3110.2.90.216 – 10.2.90.21710.2.90.217
4610.2.90.218/3110.2.90.218 – 10.2.90.21910.2.90.219
4710.2.90.220/3110.2.90.220 – 10.2.90.22110.2.90.221
4810.2.90.222/3110.2.90.222 – 10.2.90.22310.2.90.223
4910.2.90.224/3110.2.90.224 – 10.2.90.22510.2.90.225
5010.2.90.226/3110.2.90.226 – 10.2.90.22710.2.90.227
5110.2.90.228/3110.2.90.228 – 10.2.90.22910.2.90.229
5210.2.90.230/3110.2.90.230 – 10.2.90.23110.2.90.231
5310.2.90.232/3110.2.90.232 – 10.2.90.23310.2.90.233
5410.2.90.234/3110.2.90.234 – 10.2.90.23510.2.90.235
5510.2.90.236/3110.2.90.236 – 10.2.90.23710.2.90.237
5610.2.90.238/3110.2.90.238 – 10.2.90.23910.2.90.239
5710.2.90.240/3110.2.90.240 – 10.2.90.24110.2.90.241
5810.2.90.242/3110.2.90.242 – 10.2.90.24310.2.90.243
5910.2.90.244/3110.2.90.244 – 10.2.90.24510.2.90.245
6010.2.90.246/3110.2.90.246 – 10.2.90.24710.2.90.247
6110.2.90.248/3110.2.90.248 – 10.2.90.24910.2.90.249
6210.2.90.250/3110.2.90.250 – 10.2.90.25110.2.90.251
6310.2.90.252/3110.2.90.252 – 10.2.90.25310.2.90.253
6410.2.90.254/3110.2.90.254 – 10.2.90.25510.2.90.255
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 →