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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)10.2.40.192/26
network10.2.40.192/26
broadcast10.2.40.255
first host10.2.40.193
last host10.2.40.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.40.192/26
address00001010.00000010.00101000.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00101000.11000000
broadcast00001010.00000010.00101000.11111111
green = network part, grey = host part
hex0x0a0228c0
decimal167913664
reverse dns192.40.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:28c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.40.192/3210.2.40.192 – 10.2.40.19210.2.40.192
210.2.40.193/3210.2.40.193 – 10.2.40.19310.2.40.193
310.2.40.194/3210.2.40.194 – 10.2.40.19410.2.40.194
410.2.40.195/3210.2.40.195 – 10.2.40.19510.2.40.195
510.2.40.196/3210.2.40.196 – 10.2.40.19610.2.40.196
610.2.40.197/3210.2.40.197 – 10.2.40.19710.2.40.197
710.2.40.198/3210.2.40.198 – 10.2.40.19810.2.40.198
810.2.40.199/3210.2.40.199 – 10.2.40.19910.2.40.199
910.2.40.200/3210.2.40.200 – 10.2.40.20010.2.40.200
1010.2.40.201/3210.2.40.201 – 10.2.40.20110.2.40.201
1110.2.40.202/3210.2.40.202 – 10.2.40.20210.2.40.202
1210.2.40.203/3210.2.40.203 – 10.2.40.20310.2.40.203
1310.2.40.204/3210.2.40.204 – 10.2.40.20410.2.40.204
1410.2.40.205/3210.2.40.205 – 10.2.40.20510.2.40.205
1510.2.40.206/3210.2.40.206 – 10.2.40.20610.2.40.206
1610.2.40.207/3210.2.40.207 – 10.2.40.20710.2.40.207
1710.2.40.208/3210.2.40.208 – 10.2.40.20810.2.40.208
1810.2.40.209/3210.2.40.209 – 10.2.40.20910.2.40.209
1910.2.40.210/3210.2.40.210 – 10.2.40.21010.2.40.210
2010.2.40.211/3210.2.40.211 – 10.2.40.21110.2.40.211
2110.2.40.212/3210.2.40.212 – 10.2.40.21210.2.40.212
2210.2.40.213/3210.2.40.213 – 10.2.40.21310.2.40.213
2310.2.40.214/3210.2.40.214 – 10.2.40.21410.2.40.214
2410.2.40.215/3210.2.40.215 – 10.2.40.21510.2.40.215
2510.2.40.216/3210.2.40.216 – 10.2.40.21610.2.40.216
2610.2.40.217/3210.2.40.217 – 10.2.40.21710.2.40.217
2710.2.40.218/3210.2.40.218 – 10.2.40.21810.2.40.218
2810.2.40.219/3210.2.40.219 – 10.2.40.21910.2.40.219
2910.2.40.220/3210.2.40.220 – 10.2.40.22010.2.40.220
3010.2.40.221/3210.2.40.221 – 10.2.40.22110.2.40.221
3110.2.40.222/3210.2.40.222 – 10.2.40.22210.2.40.222
3210.2.40.223/3210.2.40.223 – 10.2.40.22310.2.40.223
3310.2.40.224/3210.2.40.224 – 10.2.40.22410.2.40.224
3410.2.40.225/3210.2.40.225 – 10.2.40.22510.2.40.225
3510.2.40.226/3210.2.40.226 – 10.2.40.22610.2.40.226
3610.2.40.227/3210.2.40.227 – 10.2.40.22710.2.40.227
3710.2.40.228/3210.2.40.228 – 10.2.40.22810.2.40.228
3810.2.40.229/3210.2.40.229 – 10.2.40.22910.2.40.229
3910.2.40.230/3210.2.40.230 – 10.2.40.23010.2.40.230
4010.2.40.231/3210.2.40.231 – 10.2.40.23110.2.40.231
4110.2.40.232/3210.2.40.232 – 10.2.40.23210.2.40.232
4210.2.40.233/3210.2.40.233 – 10.2.40.23310.2.40.233
4310.2.40.234/3210.2.40.234 – 10.2.40.23410.2.40.234
4410.2.40.235/3210.2.40.235 – 10.2.40.23510.2.40.235
4510.2.40.236/3210.2.40.236 – 10.2.40.23610.2.40.236
4610.2.40.237/3210.2.40.237 – 10.2.40.23710.2.40.237
4710.2.40.238/3210.2.40.238 – 10.2.40.23810.2.40.238
4810.2.40.239/3210.2.40.239 – 10.2.40.23910.2.40.239
4910.2.40.240/3210.2.40.240 – 10.2.40.24010.2.40.240
5010.2.40.241/3210.2.40.241 – 10.2.40.24110.2.40.241
5110.2.40.242/3210.2.40.242 – 10.2.40.24210.2.40.242
5210.2.40.243/3210.2.40.243 – 10.2.40.24310.2.40.243
5310.2.40.244/3210.2.40.244 – 10.2.40.24410.2.40.244
5410.2.40.245/3210.2.40.245 – 10.2.40.24510.2.40.245
5510.2.40.246/3210.2.40.246 – 10.2.40.24610.2.40.246
5610.2.40.247/3210.2.40.247 – 10.2.40.24710.2.40.247
5710.2.40.248/3210.2.40.248 – 10.2.40.24810.2.40.248
5810.2.40.249/3210.2.40.249 – 10.2.40.24910.2.40.249
5910.2.40.250/3210.2.40.250 – 10.2.40.25010.2.40.250
6010.2.40.251/3210.2.40.251 – 10.2.40.25110.2.40.251
6110.2.40.252/3210.2.40.252 – 10.2.40.25210.2.40.252
6210.2.40.253/3210.2.40.253 – 10.2.40.25310.2.40.253
6310.2.40.254/3210.2.40.254 – 10.2.40.25410.2.40.254
6410.2.40.255/3210.2.40.255 – 10.2.40.25510.2.40.255
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 →