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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)172.16.5.192/26
network172.16.5.192/26
broadcast172.16.5.255
first host172.16.5.193
last host172.16.5.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.5.192/26
address10101100.00010000.00000101.11000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00000101.11000000
broadcast10101100.00010000.00000101.11111111
green = network part, grey = host part
hex0xac1005c0
decimal2886731200
reverse dns192.5.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:5c0

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.5.192/31172.16.5.192 – 172.16.5.193172.16.5.193
2172.16.5.194/31172.16.5.194 – 172.16.5.195172.16.5.195
3172.16.5.196/31172.16.5.196 – 172.16.5.197172.16.5.197
4172.16.5.198/31172.16.5.198 – 172.16.5.199172.16.5.199
5172.16.5.200/31172.16.5.200 – 172.16.5.201172.16.5.201
6172.16.5.202/31172.16.5.202 – 172.16.5.203172.16.5.203
7172.16.5.204/31172.16.5.204 – 172.16.5.205172.16.5.205
8172.16.5.206/31172.16.5.206 – 172.16.5.207172.16.5.207
9172.16.5.208/31172.16.5.208 – 172.16.5.209172.16.5.209
10172.16.5.210/31172.16.5.210 – 172.16.5.211172.16.5.211
11172.16.5.212/31172.16.5.212 – 172.16.5.213172.16.5.213
12172.16.5.214/31172.16.5.214 – 172.16.5.215172.16.5.215
13172.16.5.216/31172.16.5.216 – 172.16.5.217172.16.5.217
14172.16.5.218/31172.16.5.218 – 172.16.5.219172.16.5.219
15172.16.5.220/31172.16.5.220 – 172.16.5.221172.16.5.221
16172.16.5.222/31172.16.5.222 – 172.16.5.223172.16.5.223
17172.16.5.224/31172.16.5.224 – 172.16.5.225172.16.5.225
18172.16.5.226/31172.16.5.226 – 172.16.5.227172.16.5.227
19172.16.5.228/31172.16.5.228 – 172.16.5.229172.16.5.229
20172.16.5.230/31172.16.5.230 – 172.16.5.231172.16.5.231
21172.16.5.232/31172.16.5.232 – 172.16.5.233172.16.5.233
22172.16.5.234/31172.16.5.234 – 172.16.5.235172.16.5.235
23172.16.5.236/31172.16.5.236 – 172.16.5.237172.16.5.237
24172.16.5.238/31172.16.5.238 – 172.16.5.239172.16.5.239
25172.16.5.240/31172.16.5.240 – 172.16.5.241172.16.5.241
26172.16.5.242/31172.16.5.242 – 172.16.5.243172.16.5.243
27172.16.5.244/31172.16.5.244 – 172.16.5.245172.16.5.245
28172.16.5.246/31172.16.5.246 – 172.16.5.247172.16.5.247
29172.16.5.248/31172.16.5.248 – 172.16.5.249172.16.5.249
30172.16.5.250/31172.16.5.250 – 172.16.5.251172.16.5.251
31172.16.5.252/31172.16.5.252 – 172.16.5.253172.16.5.253
32172.16.5.254/31172.16.5.254 – 172.16.5.255172.16.5.255
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 →