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
private IP (RFC 1918)172.16.10.0/23
network172.16.10.0/23
broadcast172.16.11.255
first host172.16.10.1
last host172.16.11.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classB
ipcalc 172.16.10.0/23
address10101100.00010000.00001010.00000000
subnet mask11111111.11111111.11111110.00000000
network10101100.00010000.00001010.00000000
broadcast10101100.00010000.00001011.11111111
green = network part, grey = host part
hex0xac100a00
decimal2886732288
reverse dns0.10.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:a00

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
1172.16.10.0/30172.16.10.1 – 172.16.10.2172.16.10.3
2172.16.10.4/30172.16.10.5 – 172.16.10.6172.16.10.7
3172.16.10.8/30172.16.10.9 – 172.16.10.10172.16.10.11
4172.16.10.12/30172.16.10.13 – 172.16.10.14172.16.10.15
5172.16.10.16/30172.16.10.17 – 172.16.10.18172.16.10.19
6172.16.10.20/30172.16.10.21 – 172.16.10.22172.16.10.23
7172.16.10.24/30172.16.10.25 – 172.16.10.26172.16.10.27
8172.16.10.28/30172.16.10.29 – 172.16.10.30172.16.10.31
9172.16.10.32/30172.16.10.33 – 172.16.10.34172.16.10.35
10172.16.10.36/30172.16.10.37 – 172.16.10.38172.16.10.39
11172.16.10.40/30172.16.10.41 – 172.16.10.42172.16.10.43
12172.16.10.44/30172.16.10.45 – 172.16.10.46172.16.10.47
13172.16.10.48/30172.16.10.49 – 172.16.10.50172.16.10.51
14172.16.10.52/30172.16.10.53 – 172.16.10.54172.16.10.55
15172.16.10.56/30172.16.10.57 – 172.16.10.58172.16.10.59
16172.16.10.60/30172.16.10.61 – 172.16.10.62172.16.10.63
17172.16.10.64/30172.16.10.65 – 172.16.10.66172.16.10.67
18172.16.10.68/30172.16.10.69 – 172.16.10.70172.16.10.71
19172.16.10.72/30172.16.10.73 – 172.16.10.74172.16.10.75
20172.16.10.76/30172.16.10.77 – 172.16.10.78172.16.10.79
21172.16.10.80/30172.16.10.81 – 172.16.10.82172.16.10.83
22172.16.10.84/30172.16.10.85 – 172.16.10.86172.16.10.87
23172.16.10.88/30172.16.10.89 – 172.16.10.90172.16.10.91
24172.16.10.92/30172.16.10.93 – 172.16.10.94172.16.10.95
25172.16.10.96/30172.16.10.97 – 172.16.10.98172.16.10.99
26172.16.10.100/30172.16.10.101 – 172.16.10.102172.16.10.103
27172.16.10.104/30172.16.10.105 – 172.16.10.106172.16.10.107
28172.16.10.108/30172.16.10.109 – 172.16.10.110172.16.10.111
29172.16.10.112/30172.16.10.113 – 172.16.10.114172.16.10.115
30172.16.10.116/30172.16.10.117 – 172.16.10.118172.16.10.119
31172.16.10.120/30172.16.10.121 – 172.16.10.122172.16.10.123
32172.16.10.124/30172.16.10.125 – 172.16.10.126172.16.10.127
33172.16.10.128/30172.16.10.129 – 172.16.10.130172.16.10.131
34172.16.10.132/30172.16.10.133 – 172.16.10.134172.16.10.135
35172.16.10.136/30172.16.10.137 – 172.16.10.138172.16.10.139
36172.16.10.140/30172.16.10.141 – 172.16.10.142172.16.10.143
37172.16.10.144/30172.16.10.145 – 172.16.10.146172.16.10.147
38172.16.10.148/30172.16.10.149 – 172.16.10.150172.16.10.151
39172.16.10.152/30172.16.10.153 – 172.16.10.154172.16.10.155
40172.16.10.156/30172.16.10.157 – 172.16.10.158172.16.10.159
41172.16.10.160/30172.16.10.161 – 172.16.10.162172.16.10.163
42172.16.10.164/30172.16.10.165 – 172.16.10.166172.16.10.167
43172.16.10.168/30172.16.10.169 – 172.16.10.170172.16.10.171
44172.16.10.172/30172.16.10.173 – 172.16.10.174172.16.10.175
45172.16.10.176/30172.16.10.177 – 172.16.10.178172.16.10.179
46172.16.10.180/30172.16.10.181 – 172.16.10.182172.16.10.183
47172.16.10.184/30172.16.10.185 – 172.16.10.186172.16.10.187
48172.16.10.188/30172.16.10.189 – 172.16.10.190172.16.10.191
49172.16.10.192/30172.16.10.193 – 172.16.10.194172.16.10.195
50172.16.10.196/30172.16.10.197 – 172.16.10.198172.16.10.199
51172.16.10.200/30172.16.10.201 – 172.16.10.202172.16.10.203
52172.16.10.204/30172.16.10.205 – 172.16.10.206172.16.10.207
53172.16.10.208/30172.16.10.209 – 172.16.10.210172.16.10.211
54172.16.10.212/30172.16.10.213 – 172.16.10.214172.16.10.215
55172.16.10.216/30172.16.10.217 – 172.16.10.218172.16.10.219
56172.16.10.220/30172.16.10.221 – 172.16.10.222172.16.10.223
57172.16.10.224/30172.16.10.225 – 172.16.10.226172.16.10.227
58172.16.10.228/30172.16.10.229 – 172.16.10.230172.16.10.231
59172.16.10.232/30172.16.10.233 – 172.16.10.234172.16.10.235
60172.16.10.236/30172.16.10.237 – 172.16.10.238172.16.10.239
61172.16.10.240/30172.16.10.241 – 172.16.10.242172.16.10.243
62172.16.10.244/30172.16.10.245 – 172.16.10.246172.16.10.247
63172.16.10.248/30172.16.10.249 – 172.16.10.250172.16.10.251
64172.16.10.252/30172.16.10.253 – 172.16.10.254172.16.10.255
65172.16.11.0/30172.16.11.1 – 172.16.11.2172.16.11.3
66172.16.11.4/30172.16.11.5 – 172.16.11.6172.16.11.7
67172.16.11.8/30172.16.11.9 – 172.16.11.10172.16.11.11
68172.16.11.12/30172.16.11.13 – 172.16.11.14172.16.11.15
69172.16.11.16/30172.16.11.17 – 172.16.11.18172.16.11.19
70172.16.11.20/30172.16.11.21 – 172.16.11.22172.16.11.23
71172.16.11.24/30172.16.11.25 – 172.16.11.26172.16.11.27
72172.16.11.28/30172.16.11.29 – 172.16.11.30172.16.11.31
73172.16.11.32/30172.16.11.33 – 172.16.11.34172.16.11.35
74172.16.11.36/30172.16.11.37 – 172.16.11.38172.16.11.39
75172.16.11.40/30172.16.11.41 – 172.16.11.42172.16.11.43
76172.16.11.44/30172.16.11.45 – 172.16.11.46172.16.11.47
77172.16.11.48/30172.16.11.49 – 172.16.11.50172.16.11.51
78172.16.11.52/30172.16.11.53 – 172.16.11.54172.16.11.55
79172.16.11.56/30172.16.11.57 – 172.16.11.58172.16.11.59
80172.16.11.60/30172.16.11.61 – 172.16.11.62172.16.11.63
81172.16.11.64/30172.16.11.65 – 172.16.11.66172.16.11.67
82172.16.11.68/30172.16.11.69 – 172.16.11.70172.16.11.71
83172.16.11.72/30172.16.11.73 – 172.16.11.74172.16.11.75
84172.16.11.76/30172.16.11.77 – 172.16.11.78172.16.11.79
85172.16.11.80/30172.16.11.81 – 172.16.11.82172.16.11.83
86172.16.11.84/30172.16.11.85 – 172.16.11.86172.16.11.87
87172.16.11.88/30172.16.11.89 – 172.16.11.90172.16.11.91
88172.16.11.92/30172.16.11.93 – 172.16.11.94172.16.11.95
89172.16.11.96/30172.16.11.97 – 172.16.11.98172.16.11.99
90172.16.11.100/30172.16.11.101 – 172.16.11.102172.16.11.103
91172.16.11.104/30172.16.11.105 – 172.16.11.106172.16.11.107
92172.16.11.108/30172.16.11.109 – 172.16.11.110172.16.11.111
93172.16.11.112/30172.16.11.113 – 172.16.11.114172.16.11.115
94172.16.11.116/30172.16.11.117 – 172.16.11.118172.16.11.119
95172.16.11.120/30172.16.11.121 – 172.16.11.122172.16.11.123
96172.16.11.124/30172.16.11.125 – 172.16.11.126172.16.11.127
97172.16.11.128/30172.16.11.129 – 172.16.11.130172.16.11.131
98172.16.11.132/30172.16.11.133 – 172.16.11.134172.16.11.135
99172.16.11.136/30172.16.11.137 – 172.16.11.138172.16.11.139
100172.16.11.140/30172.16.11.141 – 172.16.11.142172.16.11.143
101172.16.11.144/30172.16.11.145 – 172.16.11.146172.16.11.147
102172.16.11.148/30172.16.11.149 – 172.16.11.150172.16.11.151
103172.16.11.152/30172.16.11.153 – 172.16.11.154172.16.11.155
104172.16.11.156/30172.16.11.157 – 172.16.11.158172.16.11.159
105172.16.11.160/30172.16.11.161 – 172.16.11.162172.16.11.163
106172.16.11.164/30172.16.11.165 – 172.16.11.166172.16.11.167
107172.16.11.168/30172.16.11.169 – 172.16.11.170172.16.11.171
108172.16.11.172/30172.16.11.173 – 172.16.11.174172.16.11.175
109172.16.11.176/30172.16.11.177 – 172.16.11.178172.16.11.179
110172.16.11.180/30172.16.11.181 – 172.16.11.182172.16.11.183
111172.16.11.184/30172.16.11.185 – 172.16.11.186172.16.11.187
112172.16.11.188/30172.16.11.189 – 172.16.11.190172.16.11.191
113172.16.11.192/30172.16.11.193 – 172.16.11.194172.16.11.195
114172.16.11.196/30172.16.11.197 – 172.16.11.198172.16.11.199
115172.16.11.200/30172.16.11.201 – 172.16.11.202172.16.11.203
116172.16.11.204/30172.16.11.205 – 172.16.11.206172.16.11.207
117172.16.11.208/30172.16.11.209 – 172.16.11.210172.16.11.211
118172.16.11.212/30172.16.11.213 – 172.16.11.214172.16.11.215
119172.16.11.216/30172.16.11.217 – 172.16.11.218172.16.11.219
120172.16.11.220/30172.16.11.221 – 172.16.11.222172.16.11.223
121172.16.11.224/30172.16.11.225 – 172.16.11.226172.16.11.227
122172.16.11.228/30172.16.11.229 – 172.16.11.230172.16.11.231
123172.16.11.232/30172.16.11.233 – 172.16.11.234172.16.11.235
124172.16.11.236/30172.16.11.237 – 172.16.11.238172.16.11.239
125172.16.11.240/30172.16.11.241 – 172.16.11.242172.16.11.243
126172.16.11.244/30172.16.11.245 – 172.16.11.246172.16.11.247
127172.16.11.248/30172.16.11.249 – 172.16.11.250172.16.11.251
128172.16.11.252/30172.16.11.253 – 172.16.11.254172.16.11.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /23
/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-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 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 →