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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)192.168.1.10/24
network192.168.1.0/24
broadcast192.168.1.255
first host192.168.1.1
last host192.168.1.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classC
ipcalc 192.168.1.10/24
address11000000.10101000.00000001.00001010
subnet mask11111111.11111111.11111111.00000000
network11000000.10101000.00000001.00000000
broadcast11000000.10101000.00000001.11111111
green = network part, grey = host part
hex0xc0a8010a
decimal3232235786
reverse dns10.1.168.192.in-addr.arpa
ipv4-mapped::ffff:c0a8:10a

/24 split into /29 · 32 subnets

close ×
#networkhost rangebroadcast
1192.168.1.0/29192.168.1.1 – 192.168.1.6192.168.1.7
2192.168.1.8/29192.168.1.9 – 192.168.1.14192.168.1.15
3192.168.1.16/29192.168.1.17 – 192.168.1.22192.168.1.23
4192.168.1.24/29192.168.1.25 – 192.168.1.30192.168.1.31
5192.168.1.32/29192.168.1.33 – 192.168.1.38192.168.1.39
6192.168.1.40/29192.168.1.41 – 192.168.1.46192.168.1.47
7192.168.1.48/29192.168.1.49 – 192.168.1.54192.168.1.55
8192.168.1.56/29192.168.1.57 – 192.168.1.62192.168.1.63
9192.168.1.64/29192.168.1.65 – 192.168.1.70192.168.1.71
10192.168.1.72/29192.168.1.73 – 192.168.1.78192.168.1.79
11192.168.1.80/29192.168.1.81 – 192.168.1.86192.168.1.87
12192.168.1.88/29192.168.1.89 – 192.168.1.94192.168.1.95
13192.168.1.96/29192.168.1.97 – 192.168.1.102192.168.1.103
14192.168.1.104/29192.168.1.105 – 192.168.1.110192.168.1.111
15192.168.1.112/29192.168.1.113 – 192.168.1.118192.168.1.119
16192.168.1.120/29192.168.1.121 – 192.168.1.126192.168.1.127
17192.168.1.128/29192.168.1.129 – 192.168.1.134192.168.1.135
18192.168.1.136/29192.168.1.137 – 192.168.1.142192.168.1.143
19192.168.1.144/29192.168.1.145 – 192.168.1.150192.168.1.151
20192.168.1.152/29192.168.1.153 – 192.168.1.158192.168.1.159
21192.168.1.160/29192.168.1.161 – 192.168.1.166192.168.1.167
22192.168.1.168/29192.168.1.169 – 192.168.1.174192.168.1.175
23192.168.1.176/29192.168.1.177 – 192.168.1.182192.168.1.183
24192.168.1.184/29192.168.1.185 – 192.168.1.190192.168.1.191
25192.168.1.192/29192.168.1.193 – 192.168.1.198192.168.1.199
26192.168.1.200/29192.168.1.201 – 192.168.1.206192.168.1.207
27192.168.1.208/29192.168.1.209 – 192.168.1.214192.168.1.215
28192.168.1.216/29192.168.1.217 – 192.168.1.222192.168.1.223
29192.168.1.224/29192.168.1.225 – 192.168.1.230192.168.1.231
30192.168.1.232/29192.168.1.233 – 192.168.1.238192.168.1.239
31192.168.1.240/29192.168.1.241 – 192.168.1.246192.168.1.247
32192.168.1.248/29192.168.1.249 – 192.168.1.254192.168.1.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/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-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →