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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)10.0.61.128/25
network10.0.61.128/25
broadcast10.0.61.255
first host10.0.61.129
last host10.0.61.254
subnet mask255.255.255.128
wildcard0.0.0.127
addresses128
usable hosts126
classA
ipcalc 10.0.61.128/25
address00001010.00000000.00111101.10000000
subnet mask11111111.11111111.11111111.10000000
network00001010.00000000.00111101.10000000
broadcast00001010.00000000.00111101.11111111
green = network part, grey = host part
hex0x0a003d80
decimal167787904
reverse dns128.61.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:3d80

/25 split into /31 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.61.128/3110.0.61.128 – 10.0.61.12910.0.61.129
210.0.61.130/3110.0.61.130 – 10.0.61.13110.0.61.131
310.0.61.132/3110.0.61.132 – 10.0.61.13310.0.61.133
410.0.61.134/3110.0.61.134 – 10.0.61.13510.0.61.135
510.0.61.136/3110.0.61.136 – 10.0.61.13710.0.61.137
610.0.61.138/3110.0.61.138 – 10.0.61.13910.0.61.139
710.0.61.140/3110.0.61.140 – 10.0.61.14110.0.61.141
810.0.61.142/3110.0.61.142 – 10.0.61.14310.0.61.143
910.0.61.144/3110.0.61.144 – 10.0.61.14510.0.61.145
1010.0.61.146/3110.0.61.146 – 10.0.61.14710.0.61.147
1110.0.61.148/3110.0.61.148 – 10.0.61.14910.0.61.149
1210.0.61.150/3110.0.61.150 – 10.0.61.15110.0.61.151
1310.0.61.152/3110.0.61.152 – 10.0.61.15310.0.61.153
1410.0.61.154/3110.0.61.154 – 10.0.61.15510.0.61.155
1510.0.61.156/3110.0.61.156 – 10.0.61.15710.0.61.157
1610.0.61.158/3110.0.61.158 – 10.0.61.15910.0.61.159
1710.0.61.160/3110.0.61.160 – 10.0.61.16110.0.61.161
1810.0.61.162/3110.0.61.162 – 10.0.61.16310.0.61.163
1910.0.61.164/3110.0.61.164 – 10.0.61.16510.0.61.165
2010.0.61.166/3110.0.61.166 – 10.0.61.16710.0.61.167
2110.0.61.168/3110.0.61.168 – 10.0.61.16910.0.61.169
2210.0.61.170/3110.0.61.170 – 10.0.61.17110.0.61.171
2310.0.61.172/3110.0.61.172 – 10.0.61.17310.0.61.173
2410.0.61.174/3110.0.61.174 – 10.0.61.17510.0.61.175
2510.0.61.176/3110.0.61.176 – 10.0.61.17710.0.61.177
2610.0.61.178/3110.0.61.178 – 10.0.61.17910.0.61.179
2710.0.61.180/3110.0.61.180 – 10.0.61.18110.0.61.181
2810.0.61.182/3110.0.61.182 – 10.0.61.18310.0.61.183
2910.0.61.184/3110.0.61.184 – 10.0.61.18510.0.61.185
3010.0.61.186/3110.0.61.186 – 10.0.61.18710.0.61.187
3110.0.61.188/3110.0.61.188 – 10.0.61.18910.0.61.189
3210.0.61.190/3110.0.61.190 – 10.0.61.19110.0.61.191
3310.0.61.192/3110.0.61.192 – 10.0.61.19310.0.61.193
3410.0.61.194/3110.0.61.194 – 10.0.61.19510.0.61.195
3510.0.61.196/3110.0.61.196 – 10.0.61.19710.0.61.197
3610.0.61.198/3110.0.61.198 – 10.0.61.19910.0.61.199
3710.0.61.200/3110.0.61.200 – 10.0.61.20110.0.61.201
3810.0.61.202/3110.0.61.202 – 10.0.61.20310.0.61.203
3910.0.61.204/3110.0.61.204 – 10.0.61.20510.0.61.205
4010.0.61.206/3110.0.61.206 – 10.0.61.20710.0.61.207
4110.0.61.208/3110.0.61.208 – 10.0.61.20910.0.61.209
4210.0.61.210/3110.0.61.210 – 10.0.61.21110.0.61.211
4310.0.61.212/3110.0.61.212 – 10.0.61.21310.0.61.213
4410.0.61.214/3110.0.61.214 – 10.0.61.21510.0.61.215
4510.0.61.216/3110.0.61.216 – 10.0.61.21710.0.61.217
4610.0.61.218/3110.0.61.218 – 10.0.61.21910.0.61.219
4710.0.61.220/3110.0.61.220 – 10.0.61.22110.0.61.221
4810.0.61.222/3110.0.61.222 – 10.0.61.22310.0.61.223
4910.0.61.224/3110.0.61.224 – 10.0.61.22510.0.61.225
5010.0.61.226/3110.0.61.226 – 10.0.61.22710.0.61.227
5110.0.61.228/3110.0.61.228 – 10.0.61.22910.0.61.229
5210.0.61.230/3110.0.61.230 – 10.0.61.23110.0.61.231
5310.0.61.232/3110.0.61.232 – 10.0.61.23310.0.61.233
5410.0.61.234/3110.0.61.234 – 10.0.61.23510.0.61.235
5510.0.61.236/3110.0.61.236 – 10.0.61.23710.0.61.237
5610.0.61.238/3110.0.61.238 – 10.0.61.23910.0.61.239
5710.0.61.240/3110.0.61.240 – 10.0.61.24110.0.61.241
5810.0.61.242/3110.0.61.242 – 10.0.61.24310.0.61.243
5910.0.61.244/3110.0.61.244 – 10.0.61.24510.0.61.245
6010.0.61.246/3110.0.61.246 – 10.0.61.24710.0.61.247
6110.0.61.248/3110.0.61.248 – 10.0.61.24910.0.61.249
6210.0.61.250/3110.0.61.250 – 10.0.61.25110.0.61.251
6310.0.61.252/3110.0.61.252 – 10.0.61.25310.0.61.253
6410.0.61.254/3110.0.61.254 – 10.0.61.25510.0.61.255
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 →