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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)172.16.1.192/26
network172.16.1.192/26
broadcast172.16.1.255
first host172.16.1.193
last host172.16.1.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.1.192/26
address10101100.00010000.00000001.11000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000001.11000000
broadcast10101100.00010000.00000001.11111111
green = network part, grey = host part
hex0xac1001c0
decimal2886730176
reverse dns192.1.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:1c0

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
1172.16.1.192/32172.16.1.192 – 172.16.1.192172.16.1.192
2172.16.1.193/32172.16.1.193 – 172.16.1.193172.16.1.193
3172.16.1.194/32172.16.1.194 – 172.16.1.194172.16.1.194
4172.16.1.195/32172.16.1.195 – 172.16.1.195172.16.1.195
5172.16.1.196/32172.16.1.196 – 172.16.1.196172.16.1.196
6172.16.1.197/32172.16.1.197 – 172.16.1.197172.16.1.197
7172.16.1.198/32172.16.1.198 – 172.16.1.198172.16.1.198
8172.16.1.199/32172.16.1.199 – 172.16.1.199172.16.1.199
9172.16.1.200/32172.16.1.200 – 172.16.1.200172.16.1.200
10172.16.1.201/32172.16.1.201 – 172.16.1.201172.16.1.201
11172.16.1.202/32172.16.1.202 – 172.16.1.202172.16.1.202
12172.16.1.203/32172.16.1.203 – 172.16.1.203172.16.1.203
13172.16.1.204/32172.16.1.204 – 172.16.1.204172.16.1.204
14172.16.1.205/32172.16.1.205 – 172.16.1.205172.16.1.205
15172.16.1.206/32172.16.1.206 – 172.16.1.206172.16.1.206
16172.16.1.207/32172.16.1.207 – 172.16.1.207172.16.1.207
17172.16.1.208/32172.16.1.208 – 172.16.1.208172.16.1.208
18172.16.1.209/32172.16.1.209 – 172.16.1.209172.16.1.209
19172.16.1.210/32172.16.1.210 – 172.16.1.210172.16.1.210
20172.16.1.211/32172.16.1.211 – 172.16.1.211172.16.1.211
21172.16.1.212/32172.16.1.212 – 172.16.1.212172.16.1.212
22172.16.1.213/32172.16.1.213 – 172.16.1.213172.16.1.213
23172.16.1.214/32172.16.1.214 – 172.16.1.214172.16.1.214
24172.16.1.215/32172.16.1.215 – 172.16.1.215172.16.1.215
25172.16.1.216/32172.16.1.216 – 172.16.1.216172.16.1.216
26172.16.1.217/32172.16.1.217 – 172.16.1.217172.16.1.217
27172.16.1.218/32172.16.1.218 – 172.16.1.218172.16.1.218
28172.16.1.219/32172.16.1.219 – 172.16.1.219172.16.1.219
29172.16.1.220/32172.16.1.220 – 172.16.1.220172.16.1.220
30172.16.1.221/32172.16.1.221 – 172.16.1.221172.16.1.221
31172.16.1.222/32172.16.1.222 – 172.16.1.222172.16.1.222
32172.16.1.223/32172.16.1.223 – 172.16.1.223172.16.1.223
33172.16.1.224/32172.16.1.224 – 172.16.1.224172.16.1.224
34172.16.1.225/32172.16.1.225 – 172.16.1.225172.16.1.225
35172.16.1.226/32172.16.1.226 – 172.16.1.226172.16.1.226
36172.16.1.227/32172.16.1.227 – 172.16.1.227172.16.1.227
37172.16.1.228/32172.16.1.228 – 172.16.1.228172.16.1.228
38172.16.1.229/32172.16.1.229 – 172.16.1.229172.16.1.229
39172.16.1.230/32172.16.1.230 – 172.16.1.230172.16.1.230
40172.16.1.231/32172.16.1.231 – 172.16.1.231172.16.1.231
41172.16.1.232/32172.16.1.232 – 172.16.1.232172.16.1.232
42172.16.1.233/32172.16.1.233 – 172.16.1.233172.16.1.233
43172.16.1.234/32172.16.1.234 – 172.16.1.234172.16.1.234
44172.16.1.235/32172.16.1.235 – 172.16.1.235172.16.1.235
45172.16.1.236/32172.16.1.236 – 172.16.1.236172.16.1.236
46172.16.1.237/32172.16.1.237 – 172.16.1.237172.16.1.237
47172.16.1.238/32172.16.1.238 – 172.16.1.238172.16.1.238
48172.16.1.239/32172.16.1.239 – 172.16.1.239172.16.1.239
49172.16.1.240/32172.16.1.240 – 172.16.1.240172.16.1.240
50172.16.1.241/32172.16.1.241 – 172.16.1.241172.16.1.241
51172.16.1.242/32172.16.1.242 – 172.16.1.242172.16.1.242
52172.16.1.243/32172.16.1.243 – 172.16.1.243172.16.1.243
53172.16.1.244/32172.16.1.244 – 172.16.1.244172.16.1.244
54172.16.1.245/32172.16.1.245 – 172.16.1.245172.16.1.245
55172.16.1.246/32172.16.1.246 – 172.16.1.246172.16.1.246
56172.16.1.247/32172.16.1.247 – 172.16.1.247172.16.1.247
57172.16.1.248/32172.16.1.248 – 172.16.1.248172.16.1.248
58172.16.1.249/32172.16.1.249 – 172.16.1.249172.16.1.249
59172.16.1.250/32172.16.1.250 – 172.16.1.250172.16.1.250
60172.16.1.251/32172.16.1.251 – 172.16.1.251172.16.1.251
61172.16.1.252/32172.16.1.252 – 172.16.1.252172.16.1.252
62172.16.1.253/32172.16.1.253 – 172.16.1.253172.16.1.253
63172.16.1.254/32172.16.1.254 – 172.16.1.254172.16.1.254
64172.16.1.255/32172.16.1.255 – 172.16.1.255172.16.1.255
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 →