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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)10.3.217.192/26
network10.3.217.192/26
broadcast10.3.217.255
first host10.3.217.193
last host10.3.217.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.217.192/26
address00001010.00000011.11011001.11000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.11011001.11000000
broadcast00001010.00000011.11011001.11111111
green = network part, grey = host part
hex0x0a03d9c0
decimal168024512
reverse dns192.217.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:d9c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.3.217.192/3210.3.217.192 – 10.3.217.19210.3.217.192
210.3.217.193/3210.3.217.193 – 10.3.217.19310.3.217.193
310.3.217.194/3210.3.217.194 – 10.3.217.19410.3.217.194
410.3.217.195/3210.3.217.195 – 10.3.217.19510.3.217.195
510.3.217.196/3210.3.217.196 – 10.3.217.19610.3.217.196
610.3.217.197/3210.3.217.197 – 10.3.217.19710.3.217.197
710.3.217.198/3210.3.217.198 – 10.3.217.19810.3.217.198
810.3.217.199/3210.3.217.199 – 10.3.217.19910.3.217.199
910.3.217.200/3210.3.217.200 – 10.3.217.20010.3.217.200
1010.3.217.201/3210.3.217.201 – 10.3.217.20110.3.217.201
1110.3.217.202/3210.3.217.202 – 10.3.217.20210.3.217.202
1210.3.217.203/3210.3.217.203 – 10.3.217.20310.3.217.203
1310.3.217.204/3210.3.217.204 – 10.3.217.20410.3.217.204
1410.3.217.205/3210.3.217.205 – 10.3.217.20510.3.217.205
1510.3.217.206/3210.3.217.206 – 10.3.217.20610.3.217.206
1610.3.217.207/3210.3.217.207 – 10.3.217.20710.3.217.207
1710.3.217.208/3210.3.217.208 – 10.3.217.20810.3.217.208
1810.3.217.209/3210.3.217.209 – 10.3.217.20910.3.217.209
1910.3.217.210/3210.3.217.210 – 10.3.217.21010.3.217.210
2010.3.217.211/3210.3.217.211 – 10.3.217.21110.3.217.211
2110.3.217.212/3210.3.217.212 – 10.3.217.21210.3.217.212
2210.3.217.213/3210.3.217.213 – 10.3.217.21310.3.217.213
2310.3.217.214/3210.3.217.214 – 10.3.217.21410.3.217.214
2410.3.217.215/3210.3.217.215 – 10.3.217.21510.3.217.215
2510.3.217.216/3210.3.217.216 – 10.3.217.21610.3.217.216
2610.3.217.217/3210.3.217.217 – 10.3.217.21710.3.217.217
2710.3.217.218/3210.3.217.218 – 10.3.217.21810.3.217.218
2810.3.217.219/3210.3.217.219 – 10.3.217.21910.3.217.219
2910.3.217.220/3210.3.217.220 – 10.3.217.22010.3.217.220
3010.3.217.221/3210.3.217.221 – 10.3.217.22110.3.217.221
3110.3.217.222/3210.3.217.222 – 10.3.217.22210.3.217.222
3210.3.217.223/3210.3.217.223 – 10.3.217.22310.3.217.223
3310.3.217.224/3210.3.217.224 – 10.3.217.22410.3.217.224
3410.3.217.225/3210.3.217.225 – 10.3.217.22510.3.217.225
3510.3.217.226/3210.3.217.226 – 10.3.217.22610.3.217.226
3610.3.217.227/3210.3.217.227 – 10.3.217.22710.3.217.227
3710.3.217.228/3210.3.217.228 – 10.3.217.22810.3.217.228
3810.3.217.229/3210.3.217.229 – 10.3.217.22910.3.217.229
3910.3.217.230/3210.3.217.230 – 10.3.217.23010.3.217.230
4010.3.217.231/3210.3.217.231 – 10.3.217.23110.3.217.231
4110.3.217.232/3210.3.217.232 – 10.3.217.23210.3.217.232
4210.3.217.233/3210.3.217.233 – 10.3.217.23310.3.217.233
4310.3.217.234/3210.3.217.234 – 10.3.217.23410.3.217.234
4410.3.217.235/3210.3.217.235 – 10.3.217.23510.3.217.235
4510.3.217.236/3210.3.217.236 – 10.3.217.23610.3.217.236
4610.3.217.237/3210.3.217.237 – 10.3.217.23710.3.217.237
4710.3.217.238/3210.3.217.238 – 10.3.217.23810.3.217.238
4810.3.217.239/3210.3.217.239 – 10.3.217.23910.3.217.239
4910.3.217.240/3210.3.217.240 – 10.3.217.24010.3.217.240
5010.3.217.241/3210.3.217.241 – 10.3.217.24110.3.217.241
5110.3.217.242/3210.3.217.242 – 10.3.217.24210.3.217.242
5210.3.217.243/3210.3.217.243 – 10.3.217.24310.3.217.243
5310.3.217.244/3210.3.217.244 – 10.3.217.24410.3.217.244
5410.3.217.245/3210.3.217.245 – 10.3.217.24510.3.217.245
5510.3.217.246/3210.3.217.246 – 10.3.217.24610.3.217.246
5610.3.217.247/3210.3.217.247 – 10.3.217.24710.3.217.247
5710.3.217.248/3210.3.217.248 – 10.3.217.24810.3.217.248
5810.3.217.249/3210.3.217.249 – 10.3.217.24910.3.217.249
5910.3.217.250/3210.3.217.250 – 10.3.217.25010.3.217.250
6010.3.217.251/3210.3.217.251 – 10.3.217.25110.3.217.251
6110.3.217.252/3210.3.217.252 – 10.3.217.25210.3.217.252
6210.3.217.253/3210.3.217.253 – 10.3.217.25310.3.217.253
6310.3.217.254/3210.3.217.254 – 10.3.217.25410.3.217.254
6410.3.217.255/3210.3.217.255 – 10.3.217.25510.3.217.255
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 →