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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)10.2.43.192/26
network10.2.43.192/26
broadcast10.2.43.255
first host10.2.43.193
last host10.2.43.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.43.192/26
address00001010.00000010.00101011.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00101011.11000000
broadcast00001010.00000010.00101011.11111111
green = network part, grey = host part
hex0x0a022bc0
decimal167914432
reverse dns192.43.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:2bc0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.43.192/3210.2.43.192 – 10.2.43.19210.2.43.192
210.2.43.193/3210.2.43.193 – 10.2.43.19310.2.43.193
310.2.43.194/3210.2.43.194 – 10.2.43.19410.2.43.194
410.2.43.195/3210.2.43.195 – 10.2.43.19510.2.43.195
510.2.43.196/3210.2.43.196 – 10.2.43.19610.2.43.196
610.2.43.197/3210.2.43.197 – 10.2.43.19710.2.43.197
710.2.43.198/3210.2.43.198 – 10.2.43.19810.2.43.198
810.2.43.199/3210.2.43.199 – 10.2.43.19910.2.43.199
910.2.43.200/3210.2.43.200 – 10.2.43.20010.2.43.200
1010.2.43.201/3210.2.43.201 – 10.2.43.20110.2.43.201
1110.2.43.202/3210.2.43.202 – 10.2.43.20210.2.43.202
1210.2.43.203/3210.2.43.203 – 10.2.43.20310.2.43.203
1310.2.43.204/3210.2.43.204 – 10.2.43.20410.2.43.204
1410.2.43.205/3210.2.43.205 – 10.2.43.20510.2.43.205
1510.2.43.206/3210.2.43.206 – 10.2.43.20610.2.43.206
1610.2.43.207/3210.2.43.207 – 10.2.43.20710.2.43.207
1710.2.43.208/3210.2.43.208 – 10.2.43.20810.2.43.208
1810.2.43.209/3210.2.43.209 – 10.2.43.20910.2.43.209
1910.2.43.210/3210.2.43.210 – 10.2.43.21010.2.43.210
2010.2.43.211/3210.2.43.211 – 10.2.43.21110.2.43.211
2110.2.43.212/3210.2.43.212 – 10.2.43.21210.2.43.212
2210.2.43.213/3210.2.43.213 – 10.2.43.21310.2.43.213
2310.2.43.214/3210.2.43.214 – 10.2.43.21410.2.43.214
2410.2.43.215/3210.2.43.215 – 10.2.43.21510.2.43.215
2510.2.43.216/3210.2.43.216 – 10.2.43.21610.2.43.216
2610.2.43.217/3210.2.43.217 – 10.2.43.21710.2.43.217
2710.2.43.218/3210.2.43.218 – 10.2.43.21810.2.43.218
2810.2.43.219/3210.2.43.219 – 10.2.43.21910.2.43.219
2910.2.43.220/3210.2.43.220 – 10.2.43.22010.2.43.220
3010.2.43.221/3210.2.43.221 – 10.2.43.22110.2.43.221
3110.2.43.222/3210.2.43.222 – 10.2.43.22210.2.43.222
3210.2.43.223/3210.2.43.223 – 10.2.43.22310.2.43.223
3310.2.43.224/3210.2.43.224 – 10.2.43.22410.2.43.224
3410.2.43.225/3210.2.43.225 – 10.2.43.22510.2.43.225
3510.2.43.226/3210.2.43.226 – 10.2.43.22610.2.43.226
3610.2.43.227/3210.2.43.227 – 10.2.43.22710.2.43.227
3710.2.43.228/3210.2.43.228 – 10.2.43.22810.2.43.228
3810.2.43.229/3210.2.43.229 – 10.2.43.22910.2.43.229
3910.2.43.230/3210.2.43.230 – 10.2.43.23010.2.43.230
4010.2.43.231/3210.2.43.231 – 10.2.43.23110.2.43.231
4110.2.43.232/3210.2.43.232 – 10.2.43.23210.2.43.232
4210.2.43.233/3210.2.43.233 – 10.2.43.23310.2.43.233
4310.2.43.234/3210.2.43.234 – 10.2.43.23410.2.43.234
4410.2.43.235/3210.2.43.235 – 10.2.43.23510.2.43.235
4510.2.43.236/3210.2.43.236 – 10.2.43.23610.2.43.236
4610.2.43.237/3210.2.43.237 – 10.2.43.23710.2.43.237
4710.2.43.238/3210.2.43.238 – 10.2.43.23810.2.43.238
4810.2.43.239/3210.2.43.239 – 10.2.43.23910.2.43.239
4910.2.43.240/3210.2.43.240 – 10.2.43.24010.2.43.240
5010.2.43.241/3210.2.43.241 – 10.2.43.24110.2.43.241
5110.2.43.242/3210.2.43.242 – 10.2.43.24210.2.43.242
5210.2.43.243/3210.2.43.243 – 10.2.43.24310.2.43.243
5310.2.43.244/3210.2.43.244 – 10.2.43.24410.2.43.244
5410.2.43.245/3210.2.43.245 – 10.2.43.24510.2.43.245
5510.2.43.246/3210.2.43.246 – 10.2.43.24610.2.43.246
5610.2.43.247/3210.2.43.247 – 10.2.43.24710.2.43.247
5710.2.43.248/3210.2.43.248 – 10.2.43.24810.2.43.248
5810.2.43.249/3210.2.43.249 – 10.2.43.24910.2.43.249
5910.2.43.250/3210.2.43.250 – 10.2.43.25010.2.43.250
6010.2.43.251/3210.2.43.251 – 10.2.43.25110.2.43.251
6110.2.43.252/3210.2.43.252 – 10.2.43.25210.2.43.252
6210.2.43.253/3210.2.43.253 – 10.2.43.25310.2.43.253
6310.2.43.254/3210.2.43.254 – 10.2.43.25410.2.43.254
6410.2.43.255/3210.2.43.255 – 10.2.43.25510.2.43.255
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 →