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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)10.167.81.192/26
network10.167.81.192/26
broadcast10.167.81.255
first host10.167.81.193
last host10.167.81.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.167.81.192/26
address00001010.10100111.01010001.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100111.01010001.11000000
broadcast00001010.10100111.01010001.11111111
green = network part, grey = host part
hex0x0aa751c0
decimal178737600
reverse dns192.81.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:51c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.81.192/3210.167.81.192 – 10.167.81.19210.167.81.192
210.167.81.193/3210.167.81.193 – 10.167.81.19310.167.81.193
310.167.81.194/3210.167.81.194 – 10.167.81.19410.167.81.194
410.167.81.195/3210.167.81.195 – 10.167.81.19510.167.81.195
510.167.81.196/3210.167.81.196 – 10.167.81.19610.167.81.196
610.167.81.197/3210.167.81.197 – 10.167.81.19710.167.81.197
710.167.81.198/3210.167.81.198 – 10.167.81.19810.167.81.198
810.167.81.199/3210.167.81.199 – 10.167.81.19910.167.81.199
910.167.81.200/3210.167.81.200 – 10.167.81.20010.167.81.200
1010.167.81.201/3210.167.81.201 – 10.167.81.20110.167.81.201
1110.167.81.202/3210.167.81.202 – 10.167.81.20210.167.81.202
1210.167.81.203/3210.167.81.203 – 10.167.81.20310.167.81.203
1310.167.81.204/3210.167.81.204 – 10.167.81.20410.167.81.204
1410.167.81.205/3210.167.81.205 – 10.167.81.20510.167.81.205
1510.167.81.206/3210.167.81.206 – 10.167.81.20610.167.81.206
1610.167.81.207/3210.167.81.207 – 10.167.81.20710.167.81.207
1710.167.81.208/3210.167.81.208 – 10.167.81.20810.167.81.208
1810.167.81.209/3210.167.81.209 – 10.167.81.20910.167.81.209
1910.167.81.210/3210.167.81.210 – 10.167.81.21010.167.81.210
2010.167.81.211/3210.167.81.211 – 10.167.81.21110.167.81.211
2110.167.81.212/3210.167.81.212 – 10.167.81.21210.167.81.212
2210.167.81.213/3210.167.81.213 – 10.167.81.21310.167.81.213
2310.167.81.214/3210.167.81.214 – 10.167.81.21410.167.81.214
2410.167.81.215/3210.167.81.215 – 10.167.81.21510.167.81.215
2510.167.81.216/3210.167.81.216 – 10.167.81.21610.167.81.216
2610.167.81.217/3210.167.81.217 – 10.167.81.21710.167.81.217
2710.167.81.218/3210.167.81.218 – 10.167.81.21810.167.81.218
2810.167.81.219/3210.167.81.219 – 10.167.81.21910.167.81.219
2910.167.81.220/3210.167.81.220 – 10.167.81.22010.167.81.220
3010.167.81.221/3210.167.81.221 – 10.167.81.22110.167.81.221
3110.167.81.222/3210.167.81.222 – 10.167.81.22210.167.81.222
3210.167.81.223/3210.167.81.223 – 10.167.81.22310.167.81.223
3310.167.81.224/3210.167.81.224 – 10.167.81.22410.167.81.224
3410.167.81.225/3210.167.81.225 – 10.167.81.22510.167.81.225
3510.167.81.226/3210.167.81.226 – 10.167.81.22610.167.81.226
3610.167.81.227/3210.167.81.227 – 10.167.81.22710.167.81.227
3710.167.81.228/3210.167.81.228 – 10.167.81.22810.167.81.228
3810.167.81.229/3210.167.81.229 – 10.167.81.22910.167.81.229
3910.167.81.230/3210.167.81.230 – 10.167.81.23010.167.81.230
4010.167.81.231/3210.167.81.231 – 10.167.81.23110.167.81.231
4110.167.81.232/3210.167.81.232 – 10.167.81.23210.167.81.232
4210.167.81.233/3210.167.81.233 – 10.167.81.23310.167.81.233
4310.167.81.234/3210.167.81.234 – 10.167.81.23410.167.81.234
4410.167.81.235/3210.167.81.235 – 10.167.81.23510.167.81.235
4510.167.81.236/3210.167.81.236 – 10.167.81.23610.167.81.236
4610.167.81.237/3210.167.81.237 – 10.167.81.23710.167.81.237
4710.167.81.238/3210.167.81.238 – 10.167.81.23810.167.81.238
4810.167.81.239/3210.167.81.239 – 10.167.81.23910.167.81.239
4910.167.81.240/3210.167.81.240 – 10.167.81.24010.167.81.240
5010.167.81.241/3210.167.81.241 – 10.167.81.24110.167.81.241
5110.167.81.242/3210.167.81.242 – 10.167.81.24210.167.81.242
5210.167.81.243/3210.167.81.243 – 10.167.81.24310.167.81.243
5310.167.81.244/3210.167.81.244 – 10.167.81.24410.167.81.244
5410.167.81.245/3210.167.81.245 – 10.167.81.24510.167.81.245
5510.167.81.246/3210.167.81.246 – 10.167.81.24610.167.81.246
5610.167.81.247/3210.167.81.247 – 10.167.81.24710.167.81.247
5710.167.81.248/3210.167.81.248 – 10.167.81.24810.167.81.248
5810.167.81.249/3210.167.81.249 – 10.167.81.24910.167.81.249
5910.167.81.250/3210.167.81.250 – 10.167.81.25010.167.81.250
6010.167.81.251/3210.167.81.251 – 10.167.81.25110.167.81.251
6110.167.81.252/3210.167.81.252 – 10.167.81.25210.167.81.252
6210.167.81.253/3210.167.81.253 – 10.167.81.25310.167.81.253
6310.167.81.254/3210.167.81.254 – 10.167.81.25410.167.81.254
6410.167.81.255/3210.167.81.255 – 10.167.81.25510.167.81.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/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-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →