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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)10.72.2.192/26
network10.72.2.192/26
broadcast10.72.2.255
first host10.72.2.193
last host10.72.2.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.72.2.192/26
address00001010.01001000.00000010.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.01001000.00000010.11000000
broadcast00001010.01001000.00000010.11111111
green = network part, grey = host part
hex0x0a4802c0
decimal172491456
reverse dns192.2.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:2c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.72.2.192/3210.72.2.192 – 10.72.2.19210.72.2.192
210.72.2.193/3210.72.2.193 – 10.72.2.19310.72.2.193
310.72.2.194/3210.72.2.194 – 10.72.2.19410.72.2.194
410.72.2.195/3210.72.2.195 – 10.72.2.19510.72.2.195
510.72.2.196/3210.72.2.196 – 10.72.2.19610.72.2.196
610.72.2.197/3210.72.2.197 – 10.72.2.19710.72.2.197
710.72.2.198/3210.72.2.198 – 10.72.2.19810.72.2.198
810.72.2.199/3210.72.2.199 – 10.72.2.19910.72.2.199
910.72.2.200/3210.72.2.200 – 10.72.2.20010.72.2.200
1010.72.2.201/3210.72.2.201 – 10.72.2.20110.72.2.201
1110.72.2.202/3210.72.2.202 – 10.72.2.20210.72.2.202
1210.72.2.203/3210.72.2.203 – 10.72.2.20310.72.2.203
1310.72.2.204/3210.72.2.204 – 10.72.2.20410.72.2.204
1410.72.2.205/3210.72.2.205 – 10.72.2.20510.72.2.205
1510.72.2.206/3210.72.2.206 – 10.72.2.20610.72.2.206
1610.72.2.207/3210.72.2.207 – 10.72.2.20710.72.2.207
1710.72.2.208/3210.72.2.208 – 10.72.2.20810.72.2.208
1810.72.2.209/3210.72.2.209 – 10.72.2.20910.72.2.209
1910.72.2.210/3210.72.2.210 – 10.72.2.21010.72.2.210
2010.72.2.211/3210.72.2.211 – 10.72.2.21110.72.2.211
2110.72.2.212/3210.72.2.212 – 10.72.2.21210.72.2.212
2210.72.2.213/3210.72.2.213 – 10.72.2.21310.72.2.213
2310.72.2.214/3210.72.2.214 – 10.72.2.21410.72.2.214
2410.72.2.215/3210.72.2.215 – 10.72.2.21510.72.2.215
2510.72.2.216/3210.72.2.216 – 10.72.2.21610.72.2.216
2610.72.2.217/3210.72.2.217 – 10.72.2.21710.72.2.217
2710.72.2.218/3210.72.2.218 – 10.72.2.21810.72.2.218
2810.72.2.219/3210.72.2.219 – 10.72.2.21910.72.2.219
2910.72.2.220/3210.72.2.220 – 10.72.2.22010.72.2.220
3010.72.2.221/3210.72.2.221 – 10.72.2.22110.72.2.221
3110.72.2.222/3210.72.2.222 – 10.72.2.22210.72.2.222
3210.72.2.223/3210.72.2.223 – 10.72.2.22310.72.2.223
3310.72.2.224/3210.72.2.224 – 10.72.2.22410.72.2.224
3410.72.2.225/3210.72.2.225 – 10.72.2.22510.72.2.225
3510.72.2.226/3210.72.2.226 – 10.72.2.22610.72.2.226
3610.72.2.227/3210.72.2.227 – 10.72.2.22710.72.2.227
3710.72.2.228/3210.72.2.228 – 10.72.2.22810.72.2.228
3810.72.2.229/3210.72.2.229 – 10.72.2.22910.72.2.229
3910.72.2.230/3210.72.2.230 – 10.72.2.23010.72.2.230
4010.72.2.231/3210.72.2.231 – 10.72.2.23110.72.2.231
4110.72.2.232/3210.72.2.232 – 10.72.2.23210.72.2.232
4210.72.2.233/3210.72.2.233 – 10.72.2.23310.72.2.233
4310.72.2.234/3210.72.2.234 – 10.72.2.23410.72.2.234
4410.72.2.235/3210.72.2.235 – 10.72.2.23510.72.2.235
4510.72.2.236/3210.72.2.236 – 10.72.2.23610.72.2.236
4610.72.2.237/3210.72.2.237 – 10.72.2.23710.72.2.237
4710.72.2.238/3210.72.2.238 – 10.72.2.23810.72.2.238
4810.72.2.239/3210.72.2.239 – 10.72.2.23910.72.2.239
4910.72.2.240/3210.72.2.240 – 10.72.2.24010.72.2.240
5010.72.2.241/3210.72.2.241 – 10.72.2.24110.72.2.241
5110.72.2.242/3210.72.2.242 – 10.72.2.24210.72.2.242
5210.72.2.243/3210.72.2.243 – 10.72.2.24310.72.2.243
5310.72.2.244/3210.72.2.244 – 10.72.2.24410.72.2.244
5410.72.2.245/3210.72.2.245 – 10.72.2.24510.72.2.245
5510.72.2.246/3210.72.2.246 – 10.72.2.24610.72.2.246
5610.72.2.247/3210.72.2.247 – 10.72.2.24710.72.2.247
5710.72.2.248/3210.72.2.248 – 10.72.2.24810.72.2.248
5810.72.2.249/3210.72.2.249 – 10.72.2.24910.72.2.249
5910.72.2.250/3210.72.2.250 – 10.72.2.25010.72.2.250
6010.72.2.251/3210.72.2.251 – 10.72.2.25110.72.2.251
6110.72.2.252/3210.72.2.252 – 10.72.2.25210.72.2.252
6210.72.2.253/3210.72.2.253 – 10.72.2.25310.72.2.253
6310.72.2.254/3210.72.2.254 – 10.72.2.25410.72.2.254
6410.72.2.255/3210.72.2.255 – 10.72.2.25510.72.2.255
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 →