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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)10.2.100.192/26
network10.2.100.192/26
broadcast10.2.100.255
first host10.2.100.193
last host10.2.100.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.100.192/26
address00001010.00000010.01100100.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.01100100.11000000
broadcast00001010.00000010.01100100.11111111
green = network part, grey = host part
hex0x0a0264c0
decimal167929024
reverse dns192.100.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:64c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.100.192/3210.2.100.192 – 10.2.100.19210.2.100.192
210.2.100.193/3210.2.100.193 – 10.2.100.19310.2.100.193
310.2.100.194/3210.2.100.194 – 10.2.100.19410.2.100.194
410.2.100.195/3210.2.100.195 – 10.2.100.19510.2.100.195
510.2.100.196/3210.2.100.196 – 10.2.100.19610.2.100.196
610.2.100.197/3210.2.100.197 – 10.2.100.19710.2.100.197
710.2.100.198/3210.2.100.198 – 10.2.100.19810.2.100.198
810.2.100.199/3210.2.100.199 – 10.2.100.19910.2.100.199
910.2.100.200/3210.2.100.200 – 10.2.100.20010.2.100.200
1010.2.100.201/3210.2.100.201 – 10.2.100.20110.2.100.201
1110.2.100.202/3210.2.100.202 – 10.2.100.20210.2.100.202
1210.2.100.203/3210.2.100.203 – 10.2.100.20310.2.100.203
1310.2.100.204/3210.2.100.204 – 10.2.100.20410.2.100.204
1410.2.100.205/3210.2.100.205 – 10.2.100.20510.2.100.205
1510.2.100.206/3210.2.100.206 – 10.2.100.20610.2.100.206
1610.2.100.207/3210.2.100.207 – 10.2.100.20710.2.100.207
1710.2.100.208/3210.2.100.208 – 10.2.100.20810.2.100.208
1810.2.100.209/3210.2.100.209 – 10.2.100.20910.2.100.209
1910.2.100.210/3210.2.100.210 – 10.2.100.21010.2.100.210
2010.2.100.211/3210.2.100.211 – 10.2.100.21110.2.100.211
2110.2.100.212/3210.2.100.212 – 10.2.100.21210.2.100.212
2210.2.100.213/3210.2.100.213 – 10.2.100.21310.2.100.213
2310.2.100.214/3210.2.100.214 – 10.2.100.21410.2.100.214
2410.2.100.215/3210.2.100.215 – 10.2.100.21510.2.100.215
2510.2.100.216/3210.2.100.216 – 10.2.100.21610.2.100.216
2610.2.100.217/3210.2.100.217 – 10.2.100.21710.2.100.217
2710.2.100.218/3210.2.100.218 – 10.2.100.21810.2.100.218
2810.2.100.219/3210.2.100.219 – 10.2.100.21910.2.100.219
2910.2.100.220/3210.2.100.220 – 10.2.100.22010.2.100.220
3010.2.100.221/3210.2.100.221 – 10.2.100.22110.2.100.221
3110.2.100.222/3210.2.100.222 – 10.2.100.22210.2.100.222
3210.2.100.223/3210.2.100.223 – 10.2.100.22310.2.100.223
3310.2.100.224/3210.2.100.224 – 10.2.100.22410.2.100.224
3410.2.100.225/3210.2.100.225 – 10.2.100.22510.2.100.225
3510.2.100.226/3210.2.100.226 – 10.2.100.22610.2.100.226
3610.2.100.227/3210.2.100.227 – 10.2.100.22710.2.100.227
3710.2.100.228/3210.2.100.228 – 10.2.100.22810.2.100.228
3810.2.100.229/3210.2.100.229 – 10.2.100.22910.2.100.229
3910.2.100.230/3210.2.100.230 – 10.2.100.23010.2.100.230
4010.2.100.231/3210.2.100.231 – 10.2.100.23110.2.100.231
4110.2.100.232/3210.2.100.232 – 10.2.100.23210.2.100.232
4210.2.100.233/3210.2.100.233 – 10.2.100.23310.2.100.233
4310.2.100.234/3210.2.100.234 – 10.2.100.23410.2.100.234
4410.2.100.235/3210.2.100.235 – 10.2.100.23510.2.100.235
4510.2.100.236/3210.2.100.236 – 10.2.100.23610.2.100.236
4610.2.100.237/3210.2.100.237 – 10.2.100.23710.2.100.237
4710.2.100.238/3210.2.100.238 – 10.2.100.23810.2.100.238
4810.2.100.239/3210.2.100.239 – 10.2.100.23910.2.100.239
4910.2.100.240/3210.2.100.240 – 10.2.100.24010.2.100.240
5010.2.100.241/3210.2.100.241 – 10.2.100.24110.2.100.241
5110.2.100.242/3210.2.100.242 – 10.2.100.24210.2.100.242
5210.2.100.243/3210.2.100.243 – 10.2.100.24310.2.100.243
5310.2.100.244/3210.2.100.244 – 10.2.100.24410.2.100.244
5410.2.100.245/3210.2.100.245 – 10.2.100.24510.2.100.245
5510.2.100.246/3210.2.100.246 – 10.2.100.24610.2.100.246
5610.2.100.247/3210.2.100.247 – 10.2.100.24710.2.100.247
5710.2.100.248/3210.2.100.248 – 10.2.100.24810.2.100.248
5810.2.100.249/3210.2.100.249 – 10.2.100.24910.2.100.249
5910.2.100.250/3210.2.100.250 – 10.2.100.25010.2.100.250
6010.2.100.251/3210.2.100.251 – 10.2.100.25110.2.100.251
6110.2.100.252/3210.2.100.252 – 10.2.100.25210.2.100.252
6210.2.100.253/3210.2.100.253 – 10.2.100.25310.2.100.253
6310.2.100.254/3210.2.100.254 – 10.2.100.25410.2.100.254
6410.2.100.255/3210.2.100.255 – 10.2.100.25510.2.100.255
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 →