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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)10.4.85.192/26
network10.4.85.192/26
broadcast10.4.85.255
first host10.4.85.193
last host10.4.85.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.4.85.192/26
address00001010.00000100.01010101.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000100.01010101.11000000
broadcast00001010.00000100.01010101.11111111
green = network part, grey = host part
hex0x0a0455c0
decimal168056256
reverse dns192.85.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:55c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.4.85.192/3210.4.85.192 – 10.4.85.19210.4.85.192
210.4.85.193/3210.4.85.193 – 10.4.85.19310.4.85.193
310.4.85.194/3210.4.85.194 – 10.4.85.19410.4.85.194
410.4.85.195/3210.4.85.195 – 10.4.85.19510.4.85.195
510.4.85.196/3210.4.85.196 – 10.4.85.19610.4.85.196
610.4.85.197/3210.4.85.197 – 10.4.85.19710.4.85.197
710.4.85.198/3210.4.85.198 – 10.4.85.19810.4.85.198
810.4.85.199/3210.4.85.199 – 10.4.85.19910.4.85.199
910.4.85.200/3210.4.85.200 – 10.4.85.20010.4.85.200
1010.4.85.201/3210.4.85.201 – 10.4.85.20110.4.85.201
1110.4.85.202/3210.4.85.202 – 10.4.85.20210.4.85.202
1210.4.85.203/3210.4.85.203 – 10.4.85.20310.4.85.203
1310.4.85.204/3210.4.85.204 – 10.4.85.20410.4.85.204
1410.4.85.205/3210.4.85.205 – 10.4.85.20510.4.85.205
1510.4.85.206/3210.4.85.206 – 10.4.85.20610.4.85.206
1610.4.85.207/3210.4.85.207 – 10.4.85.20710.4.85.207
1710.4.85.208/3210.4.85.208 – 10.4.85.20810.4.85.208
1810.4.85.209/3210.4.85.209 – 10.4.85.20910.4.85.209
1910.4.85.210/3210.4.85.210 – 10.4.85.21010.4.85.210
2010.4.85.211/3210.4.85.211 – 10.4.85.21110.4.85.211
2110.4.85.212/3210.4.85.212 – 10.4.85.21210.4.85.212
2210.4.85.213/3210.4.85.213 – 10.4.85.21310.4.85.213
2310.4.85.214/3210.4.85.214 – 10.4.85.21410.4.85.214
2410.4.85.215/3210.4.85.215 – 10.4.85.21510.4.85.215
2510.4.85.216/3210.4.85.216 – 10.4.85.21610.4.85.216
2610.4.85.217/3210.4.85.217 – 10.4.85.21710.4.85.217
2710.4.85.218/3210.4.85.218 – 10.4.85.21810.4.85.218
2810.4.85.219/3210.4.85.219 – 10.4.85.21910.4.85.219
2910.4.85.220/3210.4.85.220 – 10.4.85.22010.4.85.220
3010.4.85.221/3210.4.85.221 – 10.4.85.22110.4.85.221
3110.4.85.222/3210.4.85.222 – 10.4.85.22210.4.85.222
3210.4.85.223/3210.4.85.223 – 10.4.85.22310.4.85.223
3310.4.85.224/3210.4.85.224 – 10.4.85.22410.4.85.224
3410.4.85.225/3210.4.85.225 – 10.4.85.22510.4.85.225
3510.4.85.226/3210.4.85.226 – 10.4.85.22610.4.85.226
3610.4.85.227/3210.4.85.227 – 10.4.85.22710.4.85.227
3710.4.85.228/3210.4.85.228 – 10.4.85.22810.4.85.228
3810.4.85.229/3210.4.85.229 – 10.4.85.22910.4.85.229
3910.4.85.230/3210.4.85.230 – 10.4.85.23010.4.85.230
4010.4.85.231/3210.4.85.231 – 10.4.85.23110.4.85.231
4110.4.85.232/3210.4.85.232 – 10.4.85.23210.4.85.232
4210.4.85.233/3210.4.85.233 – 10.4.85.23310.4.85.233
4310.4.85.234/3210.4.85.234 – 10.4.85.23410.4.85.234
4410.4.85.235/3210.4.85.235 – 10.4.85.23510.4.85.235
4510.4.85.236/3210.4.85.236 – 10.4.85.23610.4.85.236
4610.4.85.237/3210.4.85.237 – 10.4.85.23710.4.85.237
4710.4.85.238/3210.4.85.238 – 10.4.85.23810.4.85.238
4810.4.85.239/3210.4.85.239 – 10.4.85.23910.4.85.239
4910.4.85.240/3210.4.85.240 – 10.4.85.24010.4.85.240
5010.4.85.241/3210.4.85.241 – 10.4.85.24110.4.85.241
5110.4.85.242/3210.4.85.242 – 10.4.85.24210.4.85.242
5210.4.85.243/3210.4.85.243 – 10.4.85.24310.4.85.243
5310.4.85.244/3210.4.85.244 – 10.4.85.24410.4.85.244
5410.4.85.245/3210.4.85.245 – 10.4.85.24510.4.85.245
5510.4.85.246/3210.4.85.246 – 10.4.85.24610.4.85.246
5610.4.85.247/3210.4.85.247 – 10.4.85.24710.4.85.247
5710.4.85.248/3210.4.85.248 – 10.4.85.24810.4.85.248
5810.4.85.249/3210.4.85.249 – 10.4.85.24910.4.85.249
5910.4.85.250/3210.4.85.250 – 10.4.85.25010.4.85.250
6010.4.85.251/3210.4.85.251 – 10.4.85.25110.4.85.251
6110.4.85.252/3210.4.85.252 – 10.4.85.25210.4.85.252
6210.4.85.253/3210.4.85.253 – 10.4.85.25310.4.85.253
6310.4.85.254/3210.4.85.254 – 10.4.85.25410.4.85.254
6410.4.85.255/3210.4.85.255 – 10.4.85.25510.4.85.255
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 →