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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)10.37.3.192/26
network10.37.3.192/26
broadcast10.37.3.255
first host10.37.3.193
last host10.37.3.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.37.3.192/26
address00001010.00100101.00000011.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00100101.00000011.11000000
broadcast00001010.00100101.00000011.11111111
green = network part, grey = host part
hex0x0a2503c0
decimal170197952
reverse dns192.3.37.10.in-addr.arpa
ipv4-mapped::ffff:a25:3c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.37.3.192/3210.37.3.192 – 10.37.3.19210.37.3.192
210.37.3.193/3210.37.3.193 – 10.37.3.19310.37.3.193
310.37.3.194/3210.37.3.194 – 10.37.3.19410.37.3.194
410.37.3.195/3210.37.3.195 – 10.37.3.19510.37.3.195
510.37.3.196/3210.37.3.196 – 10.37.3.19610.37.3.196
610.37.3.197/3210.37.3.197 – 10.37.3.19710.37.3.197
710.37.3.198/3210.37.3.198 – 10.37.3.19810.37.3.198
810.37.3.199/3210.37.3.199 – 10.37.3.19910.37.3.199
910.37.3.200/3210.37.3.200 – 10.37.3.20010.37.3.200
1010.37.3.201/3210.37.3.201 – 10.37.3.20110.37.3.201
1110.37.3.202/3210.37.3.202 – 10.37.3.20210.37.3.202
1210.37.3.203/3210.37.3.203 – 10.37.3.20310.37.3.203
1310.37.3.204/3210.37.3.204 – 10.37.3.20410.37.3.204
1410.37.3.205/3210.37.3.205 – 10.37.3.20510.37.3.205
1510.37.3.206/3210.37.3.206 – 10.37.3.20610.37.3.206
1610.37.3.207/3210.37.3.207 – 10.37.3.20710.37.3.207
1710.37.3.208/3210.37.3.208 – 10.37.3.20810.37.3.208
1810.37.3.209/3210.37.3.209 – 10.37.3.20910.37.3.209
1910.37.3.210/3210.37.3.210 – 10.37.3.21010.37.3.210
2010.37.3.211/3210.37.3.211 – 10.37.3.21110.37.3.211
2110.37.3.212/3210.37.3.212 – 10.37.3.21210.37.3.212
2210.37.3.213/3210.37.3.213 – 10.37.3.21310.37.3.213
2310.37.3.214/3210.37.3.214 – 10.37.3.21410.37.3.214
2410.37.3.215/3210.37.3.215 – 10.37.3.21510.37.3.215
2510.37.3.216/3210.37.3.216 – 10.37.3.21610.37.3.216
2610.37.3.217/3210.37.3.217 – 10.37.3.21710.37.3.217
2710.37.3.218/3210.37.3.218 – 10.37.3.21810.37.3.218
2810.37.3.219/3210.37.3.219 – 10.37.3.21910.37.3.219
2910.37.3.220/3210.37.3.220 – 10.37.3.22010.37.3.220
3010.37.3.221/3210.37.3.221 – 10.37.3.22110.37.3.221
3110.37.3.222/3210.37.3.222 – 10.37.3.22210.37.3.222
3210.37.3.223/3210.37.3.223 – 10.37.3.22310.37.3.223
3310.37.3.224/3210.37.3.224 – 10.37.3.22410.37.3.224
3410.37.3.225/3210.37.3.225 – 10.37.3.22510.37.3.225
3510.37.3.226/3210.37.3.226 – 10.37.3.22610.37.3.226
3610.37.3.227/3210.37.3.227 – 10.37.3.22710.37.3.227
3710.37.3.228/3210.37.3.228 – 10.37.3.22810.37.3.228
3810.37.3.229/3210.37.3.229 – 10.37.3.22910.37.3.229
3910.37.3.230/3210.37.3.230 – 10.37.3.23010.37.3.230
4010.37.3.231/3210.37.3.231 – 10.37.3.23110.37.3.231
4110.37.3.232/3210.37.3.232 – 10.37.3.23210.37.3.232
4210.37.3.233/3210.37.3.233 – 10.37.3.23310.37.3.233
4310.37.3.234/3210.37.3.234 – 10.37.3.23410.37.3.234
4410.37.3.235/3210.37.3.235 – 10.37.3.23510.37.3.235
4510.37.3.236/3210.37.3.236 – 10.37.3.23610.37.3.236
4610.37.3.237/3210.37.3.237 – 10.37.3.23710.37.3.237
4710.37.3.238/3210.37.3.238 – 10.37.3.23810.37.3.238
4810.37.3.239/3210.37.3.239 – 10.37.3.23910.37.3.239
4910.37.3.240/3210.37.3.240 – 10.37.3.24010.37.3.240
5010.37.3.241/3210.37.3.241 – 10.37.3.24110.37.3.241
5110.37.3.242/3210.37.3.242 – 10.37.3.24210.37.3.242
5210.37.3.243/3210.37.3.243 – 10.37.3.24310.37.3.243
5310.37.3.244/3210.37.3.244 – 10.37.3.24410.37.3.244
5410.37.3.245/3210.37.3.245 – 10.37.3.24510.37.3.245
5510.37.3.246/3210.37.3.246 – 10.37.3.24610.37.3.246
5610.37.3.247/3210.37.3.247 – 10.37.3.24710.37.3.247
5710.37.3.248/3210.37.3.248 – 10.37.3.24810.37.3.248
5810.37.3.249/3210.37.3.249 – 10.37.3.24910.37.3.249
5910.37.3.250/3210.37.3.250 – 10.37.3.25010.37.3.250
6010.37.3.251/3210.37.3.251 – 10.37.3.25110.37.3.251
6110.37.3.252/3210.37.3.252 – 10.37.3.25210.37.3.252
6210.37.3.253/3210.37.3.253 – 10.37.3.25310.37.3.253
6310.37.3.254/3210.37.3.254 – 10.37.3.25410.37.3.254
6410.37.3.255/3210.37.3.255 – 10.37.3.25510.37.3.255
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 →