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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)10.2.57.192/26
network10.2.57.192/26
broadcast10.2.57.255
first host10.2.57.193
last host10.2.57.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.57.192/26
address00001010.00000010.00111001.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00111001.11000000
broadcast00001010.00000010.00111001.11111111
green = network part, grey = host part
hex0x0a0239c0
decimal167918016
reverse dns192.57.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:39c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.57.192/3210.2.57.192 – 10.2.57.19210.2.57.192
210.2.57.193/3210.2.57.193 – 10.2.57.19310.2.57.193
310.2.57.194/3210.2.57.194 – 10.2.57.19410.2.57.194
410.2.57.195/3210.2.57.195 – 10.2.57.19510.2.57.195
510.2.57.196/3210.2.57.196 – 10.2.57.19610.2.57.196
610.2.57.197/3210.2.57.197 – 10.2.57.19710.2.57.197
710.2.57.198/3210.2.57.198 – 10.2.57.19810.2.57.198
810.2.57.199/3210.2.57.199 – 10.2.57.19910.2.57.199
910.2.57.200/3210.2.57.200 – 10.2.57.20010.2.57.200
1010.2.57.201/3210.2.57.201 – 10.2.57.20110.2.57.201
1110.2.57.202/3210.2.57.202 – 10.2.57.20210.2.57.202
1210.2.57.203/3210.2.57.203 – 10.2.57.20310.2.57.203
1310.2.57.204/3210.2.57.204 – 10.2.57.20410.2.57.204
1410.2.57.205/3210.2.57.205 – 10.2.57.20510.2.57.205
1510.2.57.206/3210.2.57.206 – 10.2.57.20610.2.57.206
1610.2.57.207/3210.2.57.207 – 10.2.57.20710.2.57.207
1710.2.57.208/3210.2.57.208 – 10.2.57.20810.2.57.208
1810.2.57.209/3210.2.57.209 – 10.2.57.20910.2.57.209
1910.2.57.210/3210.2.57.210 – 10.2.57.21010.2.57.210
2010.2.57.211/3210.2.57.211 – 10.2.57.21110.2.57.211
2110.2.57.212/3210.2.57.212 – 10.2.57.21210.2.57.212
2210.2.57.213/3210.2.57.213 – 10.2.57.21310.2.57.213
2310.2.57.214/3210.2.57.214 – 10.2.57.21410.2.57.214
2410.2.57.215/3210.2.57.215 – 10.2.57.21510.2.57.215
2510.2.57.216/3210.2.57.216 – 10.2.57.21610.2.57.216
2610.2.57.217/3210.2.57.217 – 10.2.57.21710.2.57.217
2710.2.57.218/3210.2.57.218 – 10.2.57.21810.2.57.218
2810.2.57.219/3210.2.57.219 – 10.2.57.21910.2.57.219
2910.2.57.220/3210.2.57.220 – 10.2.57.22010.2.57.220
3010.2.57.221/3210.2.57.221 – 10.2.57.22110.2.57.221
3110.2.57.222/3210.2.57.222 – 10.2.57.22210.2.57.222
3210.2.57.223/3210.2.57.223 – 10.2.57.22310.2.57.223
3310.2.57.224/3210.2.57.224 – 10.2.57.22410.2.57.224
3410.2.57.225/3210.2.57.225 – 10.2.57.22510.2.57.225
3510.2.57.226/3210.2.57.226 – 10.2.57.22610.2.57.226
3610.2.57.227/3210.2.57.227 – 10.2.57.22710.2.57.227
3710.2.57.228/3210.2.57.228 – 10.2.57.22810.2.57.228
3810.2.57.229/3210.2.57.229 – 10.2.57.22910.2.57.229
3910.2.57.230/3210.2.57.230 – 10.2.57.23010.2.57.230
4010.2.57.231/3210.2.57.231 – 10.2.57.23110.2.57.231
4110.2.57.232/3210.2.57.232 – 10.2.57.23210.2.57.232
4210.2.57.233/3210.2.57.233 – 10.2.57.23310.2.57.233
4310.2.57.234/3210.2.57.234 – 10.2.57.23410.2.57.234
4410.2.57.235/3210.2.57.235 – 10.2.57.23510.2.57.235
4510.2.57.236/3210.2.57.236 – 10.2.57.23610.2.57.236
4610.2.57.237/3210.2.57.237 – 10.2.57.23710.2.57.237
4710.2.57.238/3210.2.57.238 – 10.2.57.23810.2.57.238
4810.2.57.239/3210.2.57.239 – 10.2.57.23910.2.57.239
4910.2.57.240/3210.2.57.240 – 10.2.57.24010.2.57.240
5010.2.57.241/3210.2.57.241 – 10.2.57.24110.2.57.241
5110.2.57.242/3210.2.57.242 – 10.2.57.24210.2.57.242
5210.2.57.243/3210.2.57.243 – 10.2.57.24310.2.57.243
5310.2.57.244/3210.2.57.244 – 10.2.57.24410.2.57.244
5410.2.57.245/3210.2.57.245 – 10.2.57.24510.2.57.245
5510.2.57.246/3210.2.57.246 – 10.2.57.24610.2.57.246
5610.2.57.247/3210.2.57.247 – 10.2.57.24710.2.57.247
5710.2.57.248/3210.2.57.248 – 10.2.57.24810.2.57.248
5810.2.57.249/3210.2.57.249 – 10.2.57.24910.2.57.249
5910.2.57.250/3210.2.57.250 – 10.2.57.25010.2.57.250
6010.2.57.251/3210.2.57.251 – 10.2.57.25110.2.57.251
6110.2.57.252/3210.2.57.252 – 10.2.57.25210.2.57.252
6210.2.57.253/3210.2.57.253 – 10.2.57.25310.2.57.253
6310.2.57.254/3210.2.57.254 – 10.2.57.25410.2.57.254
6410.2.57.255/3210.2.57.255 – 10.2.57.25510.2.57.255
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 →