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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)10.167.66.192/26
network10.167.66.192/26
broadcast10.167.66.255
first host10.167.66.193
last host10.167.66.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.167.66.192/26
address00001010.10100111.01000010.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100111.01000010.11000000
broadcast00001010.10100111.01000010.11111111
green = network part, grey = host part
hex0x0aa742c0
decimal178733760
reverse dns192.66.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:42c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.167.66.192/3210.167.66.192 – 10.167.66.19210.167.66.192
210.167.66.193/3210.167.66.193 – 10.167.66.19310.167.66.193
310.167.66.194/3210.167.66.194 – 10.167.66.19410.167.66.194
410.167.66.195/3210.167.66.195 – 10.167.66.19510.167.66.195
510.167.66.196/3210.167.66.196 – 10.167.66.19610.167.66.196
610.167.66.197/3210.167.66.197 – 10.167.66.19710.167.66.197
710.167.66.198/3210.167.66.198 – 10.167.66.19810.167.66.198
810.167.66.199/3210.167.66.199 – 10.167.66.19910.167.66.199
910.167.66.200/3210.167.66.200 – 10.167.66.20010.167.66.200
1010.167.66.201/3210.167.66.201 – 10.167.66.20110.167.66.201
1110.167.66.202/3210.167.66.202 – 10.167.66.20210.167.66.202
1210.167.66.203/3210.167.66.203 – 10.167.66.20310.167.66.203
1310.167.66.204/3210.167.66.204 – 10.167.66.20410.167.66.204
1410.167.66.205/3210.167.66.205 – 10.167.66.20510.167.66.205
1510.167.66.206/3210.167.66.206 – 10.167.66.20610.167.66.206
1610.167.66.207/3210.167.66.207 – 10.167.66.20710.167.66.207
1710.167.66.208/3210.167.66.208 – 10.167.66.20810.167.66.208
1810.167.66.209/3210.167.66.209 – 10.167.66.20910.167.66.209
1910.167.66.210/3210.167.66.210 – 10.167.66.21010.167.66.210
2010.167.66.211/3210.167.66.211 – 10.167.66.21110.167.66.211
2110.167.66.212/3210.167.66.212 – 10.167.66.21210.167.66.212
2210.167.66.213/3210.167.66.213 – 10.167.66.21310.167.66.213
2310.167.66.214/3210.167.66.214 – 10.167.66.21410.167.66.214
2410.167.66.215/3210.167.66.215 – 10.167.66.21510.167.66.215
2510.167.66.216/3210.167.66.216 – 10.167.66.21610.167.66.216
2610.167.66.217/3210.167.66.217 – 10.167.66.21710.167.66.217
2710.167.66.218/3210.167.66.218 – 10.167.66.21810.167.66.218
2810.167.66.219/3210.167.66.219 – 10.167.66.21910.167.66.219
2910.167.66.220/3210.167.66.220 – 10.167.66.22010.167.66.220
3010.167.66.221/3210.167.66.221 – 10.167.66.22110.167.66.221
3110.167.66.222/3210.167.66.222 – 10.167.66.22210.167.66.222
3210.167.66.223/3210.167.66.223 – 10.167.66.22310.167.66.223
3310.167.66.224/3210.167.66.224 – 10.167.66.22410.167.66.224
3410.167.66.225/3210.167.66.225 – 10.167.66.22510.167.66.225
3510.167.66.226/3210.167.66.226 – 10.167.66.22610.167.66.226
3610.167.66.227/3210.167.66.227 – 10.167.66.22710.167.66.227
3710.167.66.228/3210.167.66.228 – 10.167.66.22810.167.66.228
3810.167.66.229/3210.167.66.229 – 10.167.66.22910.167.66.229
3910.167.66.230/3210.167.66.230 – 10.167.66.23010.167.66.230
4010.167.66.231/3210.167.66.231 – 10.167.66.23110.167.66.231
4110.167.66.232/3210.167.66.232 – 10.167.66.23210.167.66.232
4210.167.66.233/3210.167.66.233 – 10.167.66.23310.167.66.233
4310.167.66.234/3210.167.66.234 – 10.167.66.23410.167.66.234
4410.167.66.235/3210.167.66.235 – 10.167.66.23510.167.66.235
4510.167.66.236/3210.167.66.236 – 10.167.66.23610.167.66.236
4610.167.66.237/3210.167.66.237 – 10.167.66.23710.167.66.237
4710.167.66.238/3210.167.66.238 – 10.167.66.23810.167.66.238
4810.167.66.239/3210.167.66.239 – 10.167.66.23910.167.66.239
4910.167.66.240/3210.167.66.240 – 10.167.66.24010.167.66.240
5010.167.66.241/3210.167.66.241 – 10.167.66.24110.167.66.241
5110.167.66.242/3210.167.66.242 – 10.167.66.24210.167.66.242
5210.167.66.243/3210.167.66.243 – 10.167.66.24310.167.66.243
5310.167.66.244/3210.167.66.244 – 10.167.66.24410.167.66.244
5410.167.66.245/3210.167.66.245 – 10.167.66.24510.167.66.245
5510.167.66.246/3210.167.66.246 – 10.167.66.24610.167.66.246
5610.167.66.247/3210.167.66.247 – 10.167.66.24710.167.66.247
5710.167.66.248/3210.167.66.248 – 10.167.66.24810.167.66.248
5810.167.66.249/3210.167.66.249 – 10.167.66.24910.167.66.249
5910.167.66.250/3210.167.66.250 – 10.167.66.25010.167.66.250
6010.167.66.251/3210.167.66.251 – 10.167.66.25110.167.66.251
6110.167.66.252/3210.167.66.252 – 10.167.66.25210.167.66.252
6210.167.66.253/3210.167.66.253 – 10.167.66.25310.167.66.253
6310.167.66.254/3210.167.66.254 – 10.167.66.25410.167.66.254
6410.167.66.255/3210.167.66.255 – 10.167.66.25510.167.66.255
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 →