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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)10.2.69.128/25
network10.2.69.128/25
broadcast10.2.69.255
first host10.2.69.129
last host10.2.69.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.2.69.128/25
address00001010.00000010.01000101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000010.01000101.10000000
broadcast00001010.00000010.01000101.11111111
green = network part, grey = host part
hex0x0a024580
decimal167921024
reverse dns128.69.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:4580

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.69.128/3110.2.69.128 – 10.2.69.12910.2.69.129
210.2.69.130/3110.2.69.130 – 10.2.69.13110.2.69.131
310.2.69.132/3110.2.69.132 – 10.2.69.13310.2.69.133
410.2.69.134/3110.2.69.134 – 10.2.69.13510.2.69.135
510.2.69.136/3110.2.69.136 – 10.2.69.13710.2.69.137
610.2.69.138/3110.2.69.138 – 10.2.69.13910.2.69.139
710.2.69.140/3110.2.69.140 – 10.2.69.14110.2.69.141
810.2.69.142/3110.2.69.142 – 10.2.69.14310.2.69.143
910.2.69.144/3110.2.69.144 – 10.2.69.14510.2.69.145
1010.2.69.146/3110.2.69.146 – 10.2.69.14710.2.69.147
1110.2.69.148/3110.2.69.148 – 10.2.69.14910.2.69.149
1210.2.69.150/3110.2.69.150 – 10.2.69.15110.2.69.151
1310.2.69.152/3110.2.69.152 – 10.2.69.15310.2.69.153
1410.2.69.154/3110.2.69.154 – 10.2.69.15510.2.69.155
1510.2.69.156/3110.2.69.156 – 10.2.69.15710.2.69.157
1610.2.69.158/3110.2.69.158 – 10.2.69.15910.2.69.159
1710.2.69.160/3110.2.69.160 – 10.2.69.16110.2.69.161
1810.2.69.162/3110.2.69.162 – 10.2.69.16310.2.69.163
1910.2.69.164/3110.2.69.164 – 10.2.69.16510.2.69.165
2010.2.69.166/3110.2.69.166 – 10.2.69.16710.2.69.167
2110.2.69.168/3110.2.69.168 – 10.2.69.16910.2.69.169
2210.2.69.170/3110.2.69.170 – 10.2.69.17110.2.69.171
2310.2.69.172/3110.2.69.172 – 10.2.69.17310.2.69.173
2410.2.69.174/3110.2.69.174 – 10.2.69.17510.2.69.175
2510.2.69.176/3110.2.69.176 – 10.2.69.17710.2.69.177
2610.2.69.178/3110.2.69.178 – 10.2.69.17910.2.69.179
2710.2.69.180/3110.2.69.180 – 10.2.69.18110.2.69.181
2810.2.69.182/3110.2.69.182 – 10.2.69.18310.2.69.183
2910.2.69.184/3110.2.69.184 – 10.2.69.18510.2.69.185
3010.2.69.186/3110.2.69.186 – 10.2.69.18710.2.69.187
3110.2.69.188/3110.2.69.188 – 10.2.69.18910.2.69.189
3210.2.69.190/3110.2.69.190 – 10.2.69.19110.2.69.191
3310.2.69.192/3110.2.69.192 – 10.2.69.19310.2.69.193
3410.2.69.194/3110.2.69.194 – 10.2.69.19510.2.69.195
3510.2.69.196/3110.2.69.196 – 10.2.69.19710.2.69.197
3610.2.69.198/3110.2.69.198 – 10.2.69.19910.2.69.199
3710.2.69.200/3110.2.69.200 – 10.2.69.20110.2.69.201
3810.2.69.202/3110.2.69.202 – 10.2.69.20310.2.69.203
3910.2.69.204/3110.2.69.204 – 10.2.69.20510.2.69.205
4010.2.69.206/3110.2.69.206 – 10.2.69.20710.2.69.207
4110.2.69.208/3110.2.69.208 – 10.2.69.20910.2.69.209
4210.2.69.210/3110.2.69.210 – 10.2.69.21110.2.69.211
4310.2.69.212/3110.2.69.212 – 10.2.69.21310.2.69.213
4410.2.69.214/3110.2.69.214 – 10.2.69.21510.2.69.215
4510.2.69.216/3110.2.69.216 – 10.2.69.21710.2.69.217
4610.2.69.218/3110.2.69.218 – 10.2.69.21910.2.69.219
4710.2.69.220/3110.2.69.220 – 10.2.69.22110.2.69.221
4810.2.69.222/3110.2.69.222 – 10.2.69.22310.2.69.223
4910.2.69.224/3110.2.69.224 – 10.2.69.22510.2.69.225
5010.2.69.226/3110.2.69.226 – 10.2.69.22710.2.69.227
5110.2.69.228/3110.2.69.228 – 10.2.69.22910.2.69.229
5210.2.69.230/3110.2.69.230 – 10.2.69.23110.2.69.231
5310.2.69.232/3110.2.69.232 – 10.2.69.23310.2.69.233
5410.2.69.234/3110.2.69.234 – 10.2.69.23510.2.69.235
5510.2.69.236/3110.2.69.236 – 10.2.69.23710.2.69.237
5610.2.69.238/3110.2.69.238 – 10.2.69.23910.2.69.239
5710.2.69.240/3110.2.69.240 – 10.2.69.24110.2.69.241
5810.2.69.242/3110.2.69.242 – 10.2.69.24310.2.69.243
5910.2.69.244/3110.2.69.244 – 10.2.69.24510.2.69.245
6010.2.69.246/3110.2.69.246 – 10.2.69.24710.2.69.247
6110.2.69.248/3110.2.69.248 – 10.2.69.24910.2.69.249
6210.2.69.250/3110.2.69.250 – 10.2.69.25110.2.69.251
6310.2.69.252/3110.2.69.252 – 10.2.69.25310.2.69.253
6410.2.69.254/3110.2.69.254 – 10.2.69.25510.2.69.255
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 →