ip
ipku.in

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)172.16.9.192/26
network172.16.9.192/26
broadcast172.16.9.255
first host172.16.9.193
last host172.16.9.254
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.9.192/26
address10101100.00010000.00001001.11000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00001001.11000000
broadcast10101100.00010000.00001001.11111111
green = network part, grey = host part
hex0xac1009c0
decimal2886732224
reverse dns192.9.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:9c0

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.9.192/31172.16.9.192 – 172.16.9.193172.16.9.193
2172.16.9.194/31172.16.9.194 – 172.16.9.195172.16.9.195
3172.16.9.196/31172.16.9.196 – 172.16.9.197172.16.9.197
4172.16.9.198/31172.16.9.198 – 172.16.9.199172.16.9.199
5172.16.9.200/31172.16.9.200 – 172.16.9.201172.16.9.201
6172.16.9.202/31172.16.9.202 – 172.16.9.203172.16.9.203
7172.16.9.204/31172.16.9.204 – 172.16.9.205172.16.9.205
8172.16.9.206/31172.16.9.206 – 172.16.9.207172.16.9.207
9172.16.9.208/31172.16.9.208 – 172.16.9.209172.16.9.209
10172.16.9.210/31172.16.9.210 – 172.16.9.211172.16.9.211
11172.16.9.212/31172.16.9.212 – 172.16.9.213172.16.9.213
12172.16.9.214/31172.16.9.214 – 172.16.9.215172.16.9.215
13172.16.9.216/31172.16.9.216 – 172.16.9.217172.16.9.217
14172.16.9.218/31172.16.9.218 – 172.16.9.219172.16.9.219
15172.16.9.220/31172.16.9.220 – 172.16.9.221172.16.9.221
16172.16.9.222/31172.16.9.222 – 172.16.9.223172.16.9.223
17172.16.9.224/31172.16.9.224 – 172.16.9.225172.16.9.225
18172.16.9.226/31172.16.9.226 – 172.16.9.227172.16.9.227
19172.16.9.228/31172.16.9.228 – 172.16.9.229172.16.9.229
20172.16.9.230/31172.16.9.230 – 172.16.9.231172.16.9.231
21172.16.9.232/31172.16.9.232 – 172.16.9.233172.16.9.233
22172.16.9.234/31172.16.9.234 – 172.16.9.235172.16.9.235
23172.16.9.236/31172.16.9.236 – 172.16.9.237172.16.9.237
24172.16.9.238/31172.16.9.238 – 172.16.9.239172.16.9.239
25172.16.9.240/31172.16.9.240 – 172.16.9.241172.16.9.241
26172.16.9.242/31172.16.9.242 – 172.16.9.243172.16.9.243
27172.16.9.244/31172.16.9.244 – 172.16.9.245172.16.9.245
28172.16.9.246/31172.16.9.246 – 172.16.9.247172.16.9.247
29172.16.9.248/31172.16.9.248 – 172.16.9.249172.16.9.249
30172.16.9.250/31172.16.9.250 – 172.16.9.251172.16.9.251
31172.16.9.252/31172.16.9.252 – 172.16.9.253172.16.9.253
32172.16.9.254/31172.16.9.254 – 172.16.9.255172.16.9.255
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 →