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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 /30 · 64 subnets

close ×
#networkhost rangebroadcast
1192.168.1.0/30192.168.1.1 – 192.168.1.2192.168.1.3
2192.168.1.4/30192.168.1.5 – 192.168.1.6192.168.1.7
3192.168.1.8/30192.168.1.9 – 192.168.1.10192.168.1.11
4192.168.1.12/30192.168.1.13 – 192.168.1.14192.168.1.15
5192.168.1.16/30192.168.1.17 – 192.168.1.18192.168.1.19
6192.168.1.20/30192.168.1.21 – 192.168.1.22192.168.1.23
7192.168.1.24/30192.168.1.25 – 192.168.1.26192.168.1.27
8192.168.1.28/30192.168.1.29 – 192.168.1.30192.168.1.31
9192.168.1.32/30192.168.1.33 – 192.168.1.34192.168.1.35
10192.168.1.36/30192.168.1.37 – 192.168.1.38192.168.1.39
11192.168.1.40/30192.168.1.41 – 192.168.1.42192.168.1.43
12192.168.1.44/30192.168.1.45 – 192.168.1.46192.168.1.47
13192.168.1.48/30192.168.1.49 – 192.168.1.50192.168.1.51
14192.168.1.52/30192.168.1.53 – 192.168.1.54192.168.1.55
15192.168.1.56/30192.168.1.57 – 192.168.1.58192.168.1.59
16192.168.1.60/30192.168.1.61 – 192.168.1.62192.168.1.63
17192.168.1.64/30192.168.1.65 – 192.168.1.66192.168.1.67
18192.168.1.68/30192.168.1.69 – 192.168.1.70192.168.1.71
19192.168.1.72/30192.168.1.73 – 192.168.1.74192.168.1.75
20192.168.1.76/30192.168.1.77 – 192.168.1.78192.168.1.79
21192.168.1.80/30192.168.1.81 – 192.168.1.82192.168.1.83
22192.168.1.84/30192.168.1.85 – 192.168.1.86192.168.1.87
23192.168.1.88/30192.168.1.89 – 192.168.1.90192.168.1.91
24192.168.1.92/30192.168.1.93 – 192.168.1.94192.168.1.95
25192.168.1.96/30192.168.1.97 – 192.168.1.98192.168.1.99
26192.168.1.100/30192.168.1.101 – 192.168.1.102192.168.1.103
27192.168.1.104/30192.168.1.105 – 192.168.1.106192.168.1.107
28192.168.1.108/30192.168.1.109 – 192.168.1.110192.168.1.111
29192.168.1.112/30192.168.1.113 – 192.168.1.114192.168.1.115
30192.168.1.116/30192.168.1.117 – 192.168.1.118192.168.1.119
31192.168.1.120/30192.168.1.121 – 192.168.1.122192.168.1.123
32192.168.1.124/30192.168.1.125 – 192.168.1.126192.168.1.127
33192.168.1.128/30192.168.1.129 – 192.168.1.130192.168.1.131
34192.168.1.132/30192.168.1.133 – 192.168.1.134192.168.1.135
35192.168.1.136/30192.168.1.137 – 192.168.1.138192.168.1.139
36192.168.1.140/30192.168.1.141 – 192.168.1.142192.168.1.143
37192.168.1.144/30192.168.1.145 – 192.168.1.146192.168.1.147
38192.168.1.148/30192.168.1.149 – 192.168.1.150192.168.1.151
39192.168.1.152/30192.168.1.153 – 192.168.1.154192.168.1.155
40192.168.1.156/30192.168.1.157 – 192.168.1.158192.168.1.159
41192.168.1.160/30192.168.1.161 – 192.168.1.162192.168.1.163
42192.168.1.164/30192.168.1.165 – 192.168.1.166192.168.1.167
43192.168.1.168/30192.168.1.169 – 192.168.1.170192.168.1.171
44192.168.1.172/30192.168.1.173 – 192.168.1.174192.168.1.175
45192.168.1.176/30192.168.1.177 – 192.168.1.178192.168.1.179
46192.168.1.180/30192.168.1.181 – 192.168.1.182192.168.1.183
47192.168.1.184/30192.168.1.185 – 192.168.1.186192.168.1.187
48192.168.1.188/30192.168.1.189 – 192.168.1.190192.168.1.191
49192.168.1.192/30192.168.1.193 – 192.168.1.194192.168.1.195
50192.168.1.196/30192.168.1.197 – 192.168.1.198192.168.1.199
51192.168.1.200/30192.168.1.201 – 192.168.1.202192.168.1.203
52192.168.1.204/30192.168.1.205 – 192.168.1.206192.168.1.207
53192.168.1.208/30192.168.1.209 – 192.168.1.210192.168.1.211
54192.168.1.212/30192.168.1.213 – 192.168.1.214192.168.1.215
55192.168.1.216/30192.168.1.217 – 192.168.1.218192.168.1.219
56192.168.1.220/30192.168.1.221 – 192.168.1.222192.168.1.223
57192.168.1.224/30192.168.1.225 – 192.168.1.226192.168.1.227
58192.168.1.228/30192.168.1.229 – 192.168.1.230192.168.1.231
59192.168.1.232/30192.168.1.233 – 192.168.1.234192.168.1.235
60192.168.1.236/30192.168.1.237 – 192.168.1.238192.168.1.239
61192.168.1.240/30192.168.1.241 – 192.168.1.242192.168.1.243
62192.168.1.244/30192.168.1.245 – 192.168.1.246192.168.1.247
63192.168.1.248/30192.168.1.249 – 192.168.1.250192.168.1.251
64192.168.1.252/30192.168.1.253 – 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 →