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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)10.237.3.192/26
network10.237.3.192/26
broadcast10.237.3.255
first host10.237.3.193
last host10.237.3.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.237.3.192/26
address00001010.11101101.00000011.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.11101101.00000011.11000000
broadcast00001010.11101101.00000011.11111111
green = network part, grey = host part
hex0x0aed03c0
decimal183305152
reverse dns192.3.237.10.in-addr.arpa
ipv4-mapped::ffff:aed:3c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.237.3.192/3210.237.3.192 – 10.237.3.19210.237.3.192
210.237.3.193/3210.237.3.193 – 10.237.3.19310.237.3.193
310.237.3.194/3210.237.3.194 – 10.237.3.19410.237.3.194
410.237.3.195/3210.237.3.195 – 10.237.3.19510.237.3.195
510.237.3.196/3210.237.3.196 – 10.237.3.19610.237.3.196
610.237.3.197/3210.237.3.197 – 10.237.3.19710.237.3.197
710.237.3.198/3210.237.3.198 – 10.237.3.19810.237.3.198
810.237.3.199/3210.237.3.199 – 10.237.3.19910.237.3.199
910.237.3.200/3210.237.3.200 – 10.237.3.20010.237.3.200
1010.237.3.201/3210.237.3.201 – 10.237.3.20110.237.3.201
1110.237.3.202/3210.237.3.202 – 10.237.3.20210.237.3.202
1210.237.3.203/3210.237.3.203 – 10.237.3.20310.237.3.203
1310.237.3.204/3210.237.3.204 – 10.237.3.20410.237.3.204
1410.237.3.205/3210.237.3.205 – 10.237.3.20510.237.3.205
1510.237.3.206/3210.237.3.206 – 10.237.3.20610.237.3.206
1610.237.3.207/3210.237.3.207 – 10.237.3.20710.237.3.207
1710.237.3.208/3210.237.3.208 – 10.237.3.20810.237.3.208
1810.237.3.209/3210.237.3.209 – 10.237.3.20910.237.3.209
1910.237.3.210/3210.237.3.210 – 10.237.3.21010.237.3.210
2010.237.3.211/3210.237.3.211 – 10.237.3.21110.237.3.211
2110.237.3.212/3210.237.3.212 – 10.237.3.21210.237.3.212
2210.237.3.213/3210.237.3.213 – 10.237.3.21310.237.3.213
2310.237.3.214/3210.237.3.214 – 10.237.3.21410.237.3.214
2410.237.3.215/3210.237.3.215 – 10.237.3.21510.237.3.215
2510.237.3.216/3210.237.3.216 – 10.237.3.21610.237.3.216
2610.237.3.217/3210.237.3.217 – 10.237.3.21710.237.3.217
2710.237.3.218/3210.237.3.218 – 10.237.3.21810.237.3.218
2810.237.3.219/3210.237.3.219 – 10.237.3.21910.237.3.219
2910.237.3.220/3210.237.3.220 – 10.237.3.22010.237.3.220
3010.237.3.221/3210.237.3.221 – 10.237.3.22110.237.3.221
3110.237.3.222/3210.237.3.222 – 10.237.3.22210.237.3.222
3210.237.3.223/3210.237.3.223 – 10.237.3.22310.237.3.223
3310.237.3.224/3210.237.3.224 – 10.237.3.22410.237.3.224
3410.237.3.225/3210.237.3.225 – 10.237.3.22510.237.3.225
3510.237.3.226/3210.237.3.226 – 10.237.3.22610.237.3.226
3610.237.3.227/3210.237.3.227 – 10.237.3.22710.237.3.227
3710.237.3.228/3210.237.3.228 – 10.237.3.22810.237.3.228
3810.237.3.229/3210.237.3.229 – 10.237.3.22910.237.3.229
3910.237.3.230/3210.237.3.230 – 10.237.3.23010.237.3.230
4010.237.3.231/3210.237.3.231 – 10.237.3.23110.237.3.231
4110.237.3.232/3210.237.3.232 – 10.237.3.23210.237.3.232
4210.237.3.233/3210.237.3.233 – 10.237.3.23310.237.3.233
4310.237.3.234/3210.237.3.234 – 10.237.3.23410.237.3.234
4410.237.3.235/3210.237.3.235 – 10.237.3.23510.237.3.235
4510.237.3.236/3210.237.3.236 – 10.237.3.23610.237.3.236
4610.237.3.237/3210.237.3.237 – 10.237.3.23710.237.3.237
4710.237.3.238/3210.237.3.238 – 10.237.3.23810.237.3.238
4810.237.3.239/3210.237.3.239 – 10.237.3.23910.237.3.239
4910.237.3.240/3210.237.3.240 – 10.237.3.24010.237.3.240
5010.237.3.241/3210.237.3.241 – 10.237.3.24110.237.3.241
5110.237.3.242/3210.237.3.242 – 10.237.3.24210.237.3.242
5210.237.3.243/3210.237.3.243 – 10.237.3.24310.237.3.243
5310.237.3.244/3210.237.3.244 – 10.237.3.24410.237.3.244
5410.237.3.245/3210.237.3.245 – 10.237.3.24510.237.3.245
5510.237.3.246/3210.237.3.246 – 10.237.3.24610.237.3.246
5610.237.3.247/3210.237.3.247 – 10.237.3.24710.237.3.247
5710.237.3.248/3210.237.3.248 – 10.237.3.24810.237.3.248
5810.237.3.249/3210.237.3.249 – 10.237.3.24910.237.3.249
5910.237.3.250/3210.237.3.250 – 10.237.3.25010.237.3.250
6010.237.3.251/3210.237.3.251 – 10.237.3.25110.237.3.251
6110.237.3.252/3210.237.3.252 – 10.237.3.25210.237.3.252
6210.237.3.253/3210.237.3.253 – 10.237.3.25310.237.3.253
6310.237.3.254/3210.237.3.254 – 10.237.3.25410.237.3.254
6410.237.3.255/3210.237.3.255 – 10.237.3.25510.237.3.255
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 →