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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)10.3.19.192/26
network10.3.19.192/26
broadcast10.3.19.255
first host10.3.19.193
last host10.3.19.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.19.192/26
address00001010.00000011.00010011.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.00010011.11000000
broadcast00001010.00000011.00010011.11111111
green = network part, grey = host part
hex0x0a0313c0
decimal167973824
reverse dns192.19.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:13c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.19.192/3210.3.19.192 – 10.3.19.19210.3.19.192
210.3.19.193/3210.3.19.193 – 10.3.19.19310.3.19.193
310.3.19.194/3210.3.19.194 – 10.3.19.19410.3.19.194
410.3.19.195/3210.3.19.195 – 10.3.19.19510.3.19.195
510.3.19.196/3210.3.19.196 – 10.3.19.19610.3.19.196
610.3.19.197/3210.3.19.197 – 10.3.19.19710.3.19.197
710.3.19.198/3210.3.19.198 – 10.3.19.19810.3.19.198
810.3.19.199/3210.3.19.199 – 10.3.19.19910.3.19.199
910.3.19.200/3210.3.19.200 – 10.3.19.20010.3.19.200
1010.3.19.201/3210.3.19.201 – 10.3.19.20110.3.19.201
1110.3.19.202/3210.3.19.202 – 10.3.19.20210.3.19.202
1210.3.19.203/3210.3.19.203 – 10.3.19.20310.3.19.203
1310.3.19.204/3210.3.19.204 – 10.3.19.20410.3.19.204
1410.3.19.205/3210.3.19.205 – 10.3.19.20510.3.19.205
1510.3.19.206/3210.3.19.206 – 10.3.19.20610.3.19.206
1610.3.19.207/3210.3.19.207 – 10.3.19.20710.3.19.207
1710.3.19.208/3210.3.19.208 – 10.3.19.20810.3.19.208
1810.3.19.209/3210.3.19.209 – 10.3.19.20910.3.19.209
1910.3.19.210/3210.3.19.210 – 10.3.19.21010.3.19.210
2010.3.19.211/3210.3.19.211 – 10.3.19.21110.3.19.211
2110.3.19.212/3210.3.19.212 – 10.3.19.21210.3.19.212
2210.3.19.213/3210.3.19.213 – 10.3.19.21310.3.19.213
2310.3.19.214/3210.3.19.214 – 10.3.19.21410.3.19.214
2410.3.19.215/3210.3.19.215 – 10.3.19.21510.3.19.215
2510.3.19.216/3210.3.19.216 – 10.3.19.21610.3.19.216
2610.3.19.217/3210.3.19.217 – 10.3.19.21710.3.19.217
2710.3.19.218/3210.3.19.218 – 10.3.19.21810.3.19.218
2810.3.19.219/3210.3.19.219 – 10.3.19.21910.3.19.219
2910.3.19.220/3210.3.19.220 – 10.3.19.22010.3.19.220
3010.3.19.221/3210.3.19.221 – 10.3.19.22110.3.19.221
3110.3.19.222/3210.3.19.222 – 10.3.19.22210.3.19.222
3210.3.19.223/3210.3.19.223 – 10.3.19.22310.3.19.223
3310.3.19.224/3210.3.19.224 – 10.3.19.22410.3.19.224
3410.3.19.225/3210.3.19.225 – 10.3.19.22510.3.19.225
3510.3.19.226/3210.3.19.226 – 10.3.19.22610.3.19.226
3610.3.19.227/3210.3.19.227 – 10.3.19.22710.3.19.227
3710.3.19.228/3210.3.19.228 – 10.3.19.22810.3.19.228
3810.3.19.229/3210.3.19.229 – 10.3.19.22910.3.19.229
3910.3.19.230/3210.3.19.230 – 10.3.19.23010.3.19.230
4010.3.19.231/3210.3.19.231 – 10.3.19.23110.3.19.231
4110.3.19.232/3210.3.19.232 – 10.3.19.23210.3.19.232
4210.3.19.233/3210.3.19.233 – 10.3.19.23310.3.19.233
4310.3.19.234/3210.3.19.234 – 10.3.19.23410.3.19.234
4410.3.19.235/3210.3.19.235 – 10.3.19.23510.3.19.235
4510.3.19.236/3210.3.19.236 – 10.3.19.23610.3.19.236
4610.3.19.237/3210.3.19.237 – 10.3.19.23710.3.19.237
4710.3.19.238/3210.3.19.238 – 10.3.19.23810.3.19.238
4810.3.19.239/3210.3.19.239 – 10.3.19.23910.3.19.239
4910.3.19.240/3210.3.19.240 – 10.3.19.24010.3.19.240
5010.3.19.241/3210.3.19.241 – 10.3.19.24110.3.19.241
5110.3.19.242/3210.3.19.242 – 10.3.19.24210.3.19.242
5210.3.19.243/3210.3.19.243 – 10.3.19.24310.3.19.243
5310.3.19.244/3210.3.19.244 – 10.3.19.24410.3.19.244
5410.3.19.245/3210.3.19.245 – 10.3.19.24510.3.19.245
5510.3.19.246/3210.3.19.246 – 10.3.19.24610.3.19.246
5610.3.19.247/3210.3.19.247 – 10.3.19.24710.3.19.247
5710.3.19.248/3210.3.19.248 – 10.3.19.24810.3.19.248
5810.3.19.249/3210.3.19.249 – 10.3.19.24910.3.19.249
5910.3.19.250/3210.3.19.250 – 10.3.19.25010.3.19.250
6010.3.19.251/3210.3.19.251 – 10.3.19.25110.3.19.251
6110.3.19.252/3210.3.19.252 – 10.3.19.25210.3.19.252
6210.3.19.253/3210.3.19.253 – 10.3.19.25310.3.19.253
6310.3.19.254/3210.3.19.254 – 10.3.19.25410.3.19.254
6410.3.19.255/3210.3.19.255 – 10.3.19.25510.3.19.255
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 →