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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)10.2.44.128/25
network10.2.44.128/25
broadcast10.2.44.255
first host10.2.44.129
last host10.2.44.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.44.128/25
address00001010.00000010.00101100.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.00101100.10000000
broadcast00001010.00000010.00101100.11111111
green = network part, grey = host part
hex0x0a022c80
decimal167914624
reverse dns128.44.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2c80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.44.128/3110.2.44.128 – 10.2.44.12910.2.44.129
210.2.44.130/3110.2.44.130 – 10.2.44.13110.2.44.131
310.2.44.132/3110.2.44.132 – 10.2.44.13310.2.44.133
410.2.44.134/3110.2.44.134 – 10.2.44.13510.2.44.135
510.2.44.136/3110.2.44.136 – 10.2.44.13710.2.44.137
610.2.44.138/3110.2.44.138 – 10.2.44.13910.2.44.139
710.2.44.140/3110.2.44.140 – 10.2.44.14110.2.44.141
810.2.44.142/3110.2.44.142 – 10.2.44.14310.2.44.143
910.2.44.144/3110.2.44.144 – 10.2.44.14510.2.44.145
1010.2.44.146/3110.2.44.146 – 10.2.44.14710.2.44.147
1110.2.44.148/3110.2.44.148 – 10.2.44.14910.2.44.149
1210.2.44.150/3110.2.44.150 – 10.2.44.15110.2.44.151
1310.2.44.152/3110.2.44.152 – 10.2.44.15310.2.44.153
1410.2.44.154/3110.2.44.154 – 10.2.44.15510.2.44.155
1510.2.44.156/3110.2.44.156 – 10.2.44.15710.2.44.157
1610.2.44.158/3110.2.44.158 – 10.2.44.15910.2.44.159
1710.2.44.160/3110.2.44.160 – 10.2.44.16110.2.44.161
1810.2.44.162/3110.2.44.162 – 10.2.44.16310.2.44.163
1910.2.44.164/3110.2.44.164 – 10.2.44.16510.2.44.165
2010.2.44.166/3110.2.44.166 – 10.2.44.16710.2.44.167
2110.2.44.168/3110.2.44.168 – 10.2.44.16910.2.44.169
2210.2.44.170/3110.2.44.170 – 10.2.44.17110.2.44.171
2310.2.44.172/3110.2.44.172 – 10.2.44.17310.2.44.173
2410.2.44.174/3110.2.44.174 – 10.2.44.17510.2.44.175
2510.2.44.176/3110.2.44.176 – 10.2.44.17710.2.44.177
2610.2.44.178/3110.2.44.178 – 10.2.44.17910.2.44.179
2710.2.44.180/3110.2.44.180 – 10.2.44.18110.2.44.181
2810.2.44.182/3110.2.44.182 – 10.2.44.18310.2.44.183
2910.2.44.184/3110.2.44.184 – 10.2.44.18510.2.44.185
3010.2.44.186/3110.2.44.186 – 10.2.44.18710.2.44.187
3110.2.44.188/3110.2.44.188 – 10.2.44.18910.2.44.189
3210.2.44.190/3110.2.44.190 – 10.2.44.19110.2.44.191
3310.2.44.192/3110.2.44.192 – 10.2.44.19310.2.44.193
3410.2.44.194/3110.2.44.194 – 10.2.44.19510.2.44.195
3510.2.44.196/3110.2.44.196 – 10.2.44.19710.2.44.197
3610.2.44.198/3110.2.44.198 – 10.2.44.19910.2.44.199
3710.2.44.200/3110.2.44.200 – 10.2.44.20110.2.44.201
3810.2.44.202/3110.2.44.202 – 10.2.44.20310.2.44.203
3910.2.44.204/3110.2.44.204 – 10.2.44.20510.2.44.205
4010.2.44.206/3110.2.44.206 – 10.2.44.20710.2.44.207
4110.2.44.208/3110.2.44.208 – 10.2.44.20910.2.44.209
4210.2.44.210/3110.2.44.210 – 10.2.44.21110.2.44.211
4310.2.44.212/3110.2.44.212 – 10.2.44.21310.2.44.213
4410.2.44.214/3110.2.44.214 – 10.2.44.21510.2.44.215
4510.2.44.216/3110.2.44.216 – 10.2.44.21710.2.44.217
4610.2.44.218/3110.2.44.218 – 10.2.44.21910.2.44.219
4710.2.44.220/3110.2.44.220 – 10.2.44.22110.2.44.221
4810.2.44.222/3110.2.44.222 – 10.2.44.22310.2.44.223
4910.2.44.224/3110.2.44.224 – 10.2.44.22510.2.44.225
5010.2.44.226/3110.2.44.226 – 10.2.44.22710.2.44.227
5110.2.44.228/3110.2.44.228 – 10.2.44.22910.2.44.229
5210.2.44.230/3110.2.44.230 – 10.2.44.23110.2.44.231
5310.2.44.232/3110.2.44.232 – 10.2.44.23310.2.44.233
5410.2.44.234/3110.2.44.234 – 10.2.44.23510.2.44.235
5510.2.44.236/3110.2.44.236 – 10.2.44.23710.2.44.237
5610.2.44.238/3110.2.44.238 – 10.2.44.23910.2.44.239
5710.2.44.240/3110.2.44.240 – 10.2.44.24110.2.44.241
5810.2.44.242/3110.2.44.242 – 10.2.44.24310.2.44.243
5910.2.44.244/3110.2.44.244 – 10.2.44.24510.2.44.245
6010.2.44.246/3110.2.44.246 – 10.2.44.24710.2.44.247
6110.2.44.248/3110.2.44.248 – 10.2.44.24910.2.44.249
6210.2.44.250/3110.2.44.250 – 10.2.44.25110.2.44.251
6310.2.44.252/3110.2.44.252 – 10.2.44.25310.2.44.253
6410.2.44.254/3110.2.44.254 – 10.2.44.25510.2.44.255
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 →