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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)10.3.166.192/26
network10.3.166.192/26
broadcast10.3.166.255
first host10.3.166.193
last host10.3.166.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.166.192/26
address00001010.00000011.10100110.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.10100110.11000000
broadcast00001010.00000011.10100110.11111111
green = network part, grey = host part
hex0x0a03a6c0
decimal168011456
reverse dns192.166.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:a6c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.166.192/3210.3.166.192 – 10.3.166.19210.3.166.192
210.3.166.193/3210.3.166.193 – 10.3.166.19310.3.166.193
310.3.166.194/3210.3.166.194 – 10.3.166.19410.3.166.194
410.3.166.195/3210.3.166.195 – 10.3.166.19510.3.166.195
510.3.166.196/3210.3.166.196 – 10.3.166.19610.3.166.196
610.3.166.197/3210.3.166.197 – 10.3.166.19710.3.166.197
710.3.166.198/3210.3.166.198 – 10.3.166.19810.3.166.198
810.3.166.199/3210.3.166.199 – 10.3.166.19910.3.166.199
910.3.166.200/3210.3.166.200 – 10.3.166.20010.3.166.200
1010.3.166.201/3210.3.166.201 – 10.3.166.20110.3.166.201
1110.3.166.202/3210.3.166.202 – 10.3.166.20210.3.166.202
1210.3.166.203/3210.3.166.203 – 10.3.166.20310.3.166.203
1310.3.166.204/3210.3.166.204 – 10.3.166.20410.3.166.204
1410.3.166.205/3210.3.166.205 – 10.3.166.20510.3.166.205
1510.3.166.206/3210.3.166.206 – 10.3.166.20610.3.166.206
1610.3.166.207/3210.3.166.207 – 10.3.166.20710.3.166.207
1710.3.166.208/3210.3.166.208 – 10.3.166.20810.3.166.208
1810.3.166.209/3210.3.166.209 – 10.3.166.20910.3.166.209
1910.3.166.210/3210.3.166.210 – 10.3.166.21010.3.166.210
2010.3.166.211/3210.3.166.211 – 10.3.166.21110.3.166.211
2110.3.166.212/3210.3.166.212 – 10.3.166.21210.3.166.212
2210.3.166.213/3210.3.166.213 – 10.3.166.21310.3.166.213
2310.3.166.214/3210.3.166.214 – 10.3.166.21410.3.166.214
2410.3.166.215/3210.3.166.215 – 10.3.166.21510.3.166.215
2510.3.166.216/3210.3.166.216 – 10.3.166.21610.3.166.216
2610.3.166.217/3210.3.166.217 – 10.3.166.21710.3.166.217
2710.3.166.218/3210.3.166.218 – 10.3.166.21810.3.166.218
2810.3.166.219/3210.3.166.219 – 10.3.166.21910.3.166.219
2910.3.166.220/3210.3.166.220 – 10.3.166.22010.3.166.220
3010.3.166.221/3210.3.166.221 – 10.3.166.22110.3.166.221
3110.3.166.222/3210.3.166.222 – 10.3.166.22210.3.166.222
3210.3.166.223/3210.3.166.223 – 10.3.166.22310.3.166.223
3310.3.166.224/3210.3.166.224 – 10.3.166.22410.3.166.224
3410.3.166.225/3210.3.166.225 – 10.3.166.22510.3.166.225
3510.3.166.226/3210.3.166.226 – 10.3.166.22610.3.166.226
3610.3.166.227/3210.3.166.227 – 10.3.166.22710.3.166.227
3710.3.166.228/3210.3.166.228 – 10.3.166.22810.3.166.228
3810.3.166.229/3210.3.166.229 – 10.3.166.22910.3.166.229
3910.3.166.230/3210.3.166.230 – 10.3.166.23010.3.166.230
4010.3.166.231/3210.3.166.231 – 10.3.166.23110.3.166.231
4110.3.166.232/3210.3.166.232 – 10.3.166.23210.3.166.232
4210.3.166.233/3210.3.166.233 – 10.3.166.23310.3.166.233
4310.3.166.234/3210.3.166.234 – 10.3.166.23410.3.166.234
4410.3.166.235/3210.3.166.235 – 10.3.166.23510.3.166.235
4510.3.166.236/3210.3.166.236 – 10.3.166.23610.3.166.236
4610.3.166.237/3210.3.166.237 – 10.3.166.23710.3.166.237
4710.3.166.238/3210.3.166.238 – 10.3.166.23810.3.166.238
4810.3.166.239/3210.3.166.239 – 10.3.166.23910.3.166.239
4910.3.166.240/3210.3.166.240 – 10.3.166.24010.3.166.240
5010.3.166.241/3210.3.166.241 – 10.3.166.24110.3.166.241
5110.3.166.242/3210.3.166.242 – 10.3.166.24210.3.166.242
5210.3.166.243/3210.3.166.243 – 10.3.166.24310.3.166.243
5310.3.166.244/3210.3.166.244 – 10.3.166.24410.3.166.244
5410.3.166.245/3210.3.166.245 – 10.3.166.24510.3.166.245
5510.3.166.246/3210.3.166.246 – 10.3.166.24610.3.166.246
5610.3.166.247/3210.3.166.247 – 10.3.166.24710.3.166.247
5710.3.166.248/3210.3.166.248 – 10.3.166.24810.3.166.248
5810.3.166.249/3210.3.166.249 – 10.3.166.24910.3.166.249
5910.3.166.250/3210.3.166.250 – 10.3.166.25010.3.166.250
6010.3.166.251/3210.3.166.251 – 10.3.166.25110.3.166.251
6110.3.166.252/3210.3.166.252 – 10.3.166.25210.3.166.252
6210.3.166.253/3210.3.166.253 – 10.3.166.25310.3.166.253
6310.3.166.254/3210.3.166.254 – 10.3.166.25410.3.166.254
6410.3.166.255/3210.3.166.255 – 10.3.166.25510.3.166.255
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 →