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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)10.2.239.192/26
network10.2.239.192/26
broadcast10.2.239.255
first host10.2.239.193
last host10.2.239.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.239.192/26
address00001010.00000010.11101111.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.11101111.11000000
broadcast00001010.00000010.11101111.11111111
green = network part, grey = host part
hex0x0a02efc0
decimal167964608
reverse dns192.239.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:efc0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.239.192/3210.2.239.192 – 10.2.239.19210.2.239.192
210.2.239.193/3210.2.239.193 – 10.2.239.19310.2.239.193
310.2.239.194/3210.2.239.194 – 10.2.239.19410.2.239.194
410.2.239.195/3210.2.239.195 – 10.2.239.19510.2.239.195
510.2.239.196/3210.2.239.196 – 10.2.239.19610.2.239.196
610.2.239.197/3210.2.239.197 – 10.2.239.19710.2.239.197
710.2.239.198/3210.2.239.198 – 10.2.239.19810.2.239.198
810.2.239.199/3210.2.239.199 – 10.2.239.19910.2.239.199
910.2.239.200/3210.2.239.200 – 10.2.239.20010.2.239.200
1010.2.239.201/3210.2.239.201 – 10.2.239.20110.2.239.201
1110.2.239.202/3210.2.239.202 – 10.2.239.20210.2.239.202
1210.2.239.203/3210.2.239.203 – 10.2.239.20310.2.239.203
1310.2.239.204/3210.2.239.204 – 10.2.239.20410.2.239.204
1410.2.239.205/3210.2.239.205 – 10.2.239.20510.2.239.205
1510.2.239.206/3210.2.239.206 – 10.2.239.20610.2.239.206
1610.2.239.207/3210.2.239.207 – 10.2.239.20710.2.239.207
1710.2.239.208/3210.2.239.208 – 10.2.239.20810.2.239.208
1810.2.239.209/3210.2.239.209 – 10.2.239.20910.2.239.209
1910.2.239.210/3210.2.239.210 – 10.2.239.21010.2.239.210
2010.2.239.211/3210.2.239.211 – 10.2.239.21110.2.239.211
2110.2.239.212/3210.2.239.212 – 10.2.239.21210.2.239.212
2210.2.239.213/3210.2.239.213 – 10.2.239.21310.2.239.213
2310.2.239.214/3210.2.239.214 – 10.2.239.21410.2.239.214
2410.2.239.215/3210.2.239.215 – 10.2.239.21510.2.239.215
2510.2.239.216/3210.2.239.216 – 10.2.239.21610.2.239.216
2610.2.239.217/3210.2.239.217 – 10.2.239.21710.2.239.217
2710.2.239.218/3210.2.239.218 – 10.2.239.21810.2.239.218
2810.2.239.219/3210.2.239.219 – 10.2.239.21910.2.239.219
2910.2.239.220/3210.2.239.220 – 10.2.239.22010.2.239.220
3010.2.239.221/3210.2.239.221 – 10.2.239.22110.2.239.221
3110.2.239.222/3210.2.239.222 – 10.2.239.22210.2.239.222
3210.2.239.223/3210.2.239.223 – 10.2.239.22310.2.239.223
3310.2.239.224/3210.2.239.224 – 10.2.239.22410.2.239.224
3410.2.239.225/3210.2.239.225 – 10.2.239.22510.2.239.225
3510.2.239.226/3210.2.239.226 – 10.2.239.22610.2.239.226
3610.2.239.227/3210.2.239.227 – 10.2.239.22710.2.239.227
3710.2.239.228/3210.2.239.228 – 10.2.239.22810.2.239.228
3810.2.239.229/3210.2.239.229 – 10.2.239.22910.2.239.229
3910.2.239.230/3210.2.239.230 – 10.2.239.23010.2.239.230
4010.2.239.231/3210.2.239.231 – 10.2.239.23110.2.239.231
4110.2.239.232/3210.2.239.232 – 10.2.239.23210.2.239.232
4210.2.239.233/3210.2.239.233 – 10.2.239.23310.2.239.233
4310.2.239.234/3210.2.239.234 – 10.2.239.23410.2.239.234
4410.2.239.235/3210.2.239.235 – 10.2.239.23510.2.239.235
4510.2.239.236/3210.2.239.236 – 10.2.239.23610.2.239.236
4610.2.239.237/3210.2.239.237 – 10.2.239.23710.2.239.237
4710.2.239.238/3210.2.239.238 – 10.2.239.23810.2.239.238
4810.2.239.239/3210.2.239.239 – 10.2.239.23910.2.239.239
4910.2.239.240/3210.2.239.240 – 10.2.239.24010.2.239.240
5010.2.239.241/3210.2.239.241 – 10.2.239.24110.2.239.241
5110.2.239.242/3210.2.239.242 – 10.2.239.24210.2.239.242
5210.2.239.243/3210.2.239.243 – 10.2.239.24310.2.239.243
5310.2.239.244/3210.2.239.244 – 10.2.239.24410.2.239.244
5410.2.239.245/3210.2.239.245 – 10.2.239.24510.2.239.245
5510.2.239.246/3210.2.239.246 – 10.2.239.24610.2.239.246
5610.2.239.247/3210.2.239.247 – 10.2.239.24710.2.239.247
5710.2.239.248/3210.2.239.248 – 10.2.239.24810.2.239.248
5810.2.239.249/3210.2.239.249 – 10.2.239.24910.2.239.249
5910.2.239.250/3210.2.239.250 – 10.2.239.25010.2.239.250
6010.2.239.251/3210.2.239.251 – 10.2.239.25110.2.239.251
6110.2.239.252/3210.2.239.252 – 10.2.239.25210.2.239.252
6210.2.239.253/3210.2.239.253 – 10.2.239.25310.2.239.253
6310.2.239.254/3210.2.239.254 – 10.2.239.25410.2.239.254
6410.2.239.255/3210.2.239.255 – 10.2.239.25510.2.239.255
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 →