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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)172.16.6.192/26
network172.16.6.192/26
broadcast172.16.6.255
first host172.16.6.193
last host172.16.6.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.6.192/26
address10101100.00010000.00000110.11000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000110.11000000
broadcast10101100.00010000.00000110.11111111
green = network part, grey = host part
hex0xac1006c0
decimal2886731456
reverse dns192.6.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:6c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.6.192/32172.16.6.192 – 172.16.6.192172.16.6.192
2172.16.6.193/32172.16.6.193 – 172.16.6.193172.16.6.193
3172.16.6.194/32172.16.6.194 – 172.16.6.194172.16.6.194
4172.16.6.195/32172.16.6.195 – 172.16.6.195172.16.6.195
5172.16.6.196/32172.16.6.196 – 172.16.6.196172.16.6.196
6172.16.6.197/32172.16.6.197 – 172.16.6.197172.16.6.197
7172.16.6.198/32172.16.6.198 – 172.16.6.198172.16.6.198
8172.16.6.199/32172.16.6.199 – 172.16.6.199172.16.6.199
9172.16.6.200/32172.16.6.200 – 172.16.6.200172.16.6.200
10172.16.6.201/32172.16.6.201 – 172.16.6.201172.16.6.201
11172.16.6.202/32172.16.6.202 – 172.16.6.202172.16.6.202
12172.16.6.203/32172.16.6.203 – 172.16.6.203172.16.6.203
13172.16.6.204/32172.16.6.204 – 172.16.6.204172.16.6.204
14172.16.6.205/32172.16.6.205 – 172.16.6.205172.16.6.205
15172.16.6.206/32172.16.6.206 – 172.16.6.206172.16.6.206
16172.16.6.207/32172.16.6.207 – 172.16.6.207172.16.6.207
17172.16.6.208/32172.16.6.208 – 172.16.6.208172.16.6.208
18172.16.6.209/32172.16.6.209 – 172.16.6.209172.16.6.209
19172.16.6.210/32172.16.6.210 – 172.16.6.210172.16.6.210
20172.16.6.211/32172.16.6.211 – 172.16.6.211172.16.6.211
21172.16.6.212/32172.16.6.212 – 172.16.6.212172.16.6.212
22172.16.6.213/32172.16.6.213 – 172.16.6.213172.16.6.213
23172.16.6.214/32172.16.6.214 – 172.16.6.214172.16.6.214
24172.16.6.215/32172.16.6.215 – 172.16.6.215172.16.6.215
25172.16.6.216/32172.16.6.216 – 172.16.6.216172.16.6.216
26172.16.6.217/32172.16.6.217 – 172.16.6.217172.16.6.217
27172.16.6.218/32172.16.6.218 – 172.16.6.218172.16.6.218
28172.16.6.219/32172.16.6.219 – 172.16.6.219172.16.6.219
29172.16.6.220/32172.16.6.220 – 172.16.6.220172.16.6.220
30172.16.6.221/32172.16.6.221 – 172.16.6.221172.16.6.221
31172.16.6.222/32172.16.6.222 – 172.16.6.222172.16.6.222
32172.16.6.223/32172.16.6.223 – 172.16.6.223172.16.6.223
33172.16.6.224/32172.16.6.224 – 172.16.6.224172.16.6.224
34172.16.6.225/32172.16.6.225 – 172.16.6.225172.16.6.225
35172.16.6.226/32172.16.6.226 – 172.16.6.226172.16.6.226
36172.16.6.227/32172.16.6.227 – 172.16.6.227172.16.6.227
37172.16.6.228/32172.16.6.228 – 172.16.6.228172.16.6.228
38172.16.6.229/32172.16.6.229 – 172.16.6.229172.16.6.229
39172.16.6.230/32172.16.6.230 – 172.16.6.230172.16.6.230
40172.16.6.231/32172.16.6.231 – 172.16.6.231172.16.6.231
41172.16.6.232/32172.16.6.232 – 172.16.6.232172.16.6.232
42172.16.6.233/32172.16.6.233 – 172.16.6.233172.16.6.233
43172.16.6.234/32172.16.6.234 – 172.16.6.234172.16.6.234
44172.16.6.235/32172.16.6.235 – 172.16.6.235172.16.6.235
45172.16.6.236/32172.16.6.236 – 172.16.6.236172.16.6.236
46172.16.6.237/32172.16.6.237 – 172.16.6.237172.16.6.237
47172.16.6.238/32172.16.6.238 – 172.16.6.238172.16.6.238
48172.16.6.239/32172.16.6.239 – 172.16.6.239172.16.6.239
49172.16.6.240/32172.16.6.240 – 172.16.6.240172.16.6.240
50172.16.6.241/32172.16.6.241 – 172.16.6.241172.16.6.241
51172.16.6.242/32172.16.6.242 – 172.16.6.242172.16.6.242
52172.16.6.243/32172.16.6.243 – 172.16.6.243172.16.6.243
53172.16.6.244/32172.16.6.244 – 172.16.6.244172.16.6.244
54172.16.6.245/32172.16.6.245 – 172.16.6.245172.16.6.245
55172.16.6.246/32172.16.6.246 – 172.16.6.246172.16.6.246
56172.16.6.247/32172.16.6.247 – 172.16.6.247172.16.6.247
57172.16.6.248/32172.16.6.248 – 172.16.6.248172.16.6.248
58172.16.6.249/32172.16.6.249 – 172.16.6.249172.16.6.249
59172.16.6.250/32172.16.6.250 – 172.16.6.250172.16.6.250
60172.16.6.251/32172.16.6.251 – 172.16.6.251172.16.6.251
61172.16.6.252/32172.16.6.252 – 172.16.6.252172.16.6.252
62172.16.6.253/32172.16.6.253 – 172.16.6.253172.16.6.253
63172.16.6.254/32172.16.6.254 – 172.16.6.254172.16.6.254
64172.16.6.255/32172.16.6.255 – 172.16.6.255172.16.6.255
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 →