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)10.40.72.0/23
network10.40.72.0/23
broadcast10.40.73.255
first host10.40.72.1
last host10.40.73.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.40.72.0/23
address00001010.00101000.01001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00101000.01001000.00000000
broadcast00001010.00101000.01001001.11111111
green = network part, grey = host part
hex0x0a284800
decimal170412032
reverse dns0.72.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:4800

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.40.72.0/3010.40.72.1 – 10.40.72.210.40.72.3
210.40.72.4/3010.40.72.5 – 10.40.72.610.40.72.7
310.40.72.8/3010.40.72.9 – 10.40.72.1010.40.72.11
410.40.72.12/3010.40.72.13 – 10.40.72.1410.40.72.15
510.40.72.16/3010.40.72.17 – 10.40.72.1810.40.72.19
610.40.72.20/3010.40.72.21 – 10.40.72.2210.40.72.23
710.40.72.24/3010.40.72.25 – 10.40.72.2610.40.72.27
810.40.72.28/3010.40.72.29 – 10.40.72.3010.40.72.31
910.40.72.32/3010.40.72.33 – 10.40.72.3410.40.72.35
1010.40.72.36/3010.40.72.37 – 10.40.72.3810.40.72.39
1110.40.72.40/3010.40.72.41 – 10.40.72.4210.40.72.43
1210.40.72.44/3010.40.72.45 – 10.40.72.4610.40.72.47
1310.40.72.48/3010.40.72.49 – 10.40.72.5010.40.72.51
1410.40.72.52/3010.40.72.53 – 10.40.72.5410.40.72.55
1510.40.72.56/3010.40.72.57 – 10.40.72.5810.40.72.59
1610.40.72.60/3010.40.72.61 – 10.40.72.6210.40.72.63
1710.40.72.64/3010.40.72.65 – 10.40.72.6610.40.72.67
1810.40.72.68/3010.40.72.69 – 10.40.72.7010.40.72.71
1910.40.72.72/3010.40.72.73 – 10.40.72.7410.40.72.75
2010.40.72.76/3010.40.72.77 – 10.40.72.7810.40.72.79
2110.40.72.80/3010.40.72.81 – 10.40.72.8210.40.72.83
2210.40.72.84/3010.40.72.85 – 10.40.72.8610.40.72.87
2310.40.72.88/3010.40.72.89 – 10.40.72.9010.40.72.91
2410.40.72.92/3010.40.72.93 – 10.40.72.9410.40.72.95
2510.40.72.96/3010.40.72.97 – 10.40.72.9810.40.72.99
2610.40.72.100/3010.40.72.101 – 10.40.72.10210.40.72.103
2710.40.72.104/3010.40.72.105 – 10.40.72.10610.40.72.107
2810.40.72.108/3010.40.72.109 – 10.40.72.11010.40.72.111
2910.40.72.112/3010.40.72.113 – 10.40.72.11410.40.72.115
3010.40.72.116/3010.40.72.117 – 10.40.72.11810.40.72.119
3110.40.72.120/3010.40.72.121 – 10.40.72.12210.40.72.123
3210.40.72.124/3010.40.72.125 – 10.40.72.12610.40.72.127
3310.40.72.128/3010.40.72.129 – 10.40.72.13010.40.72.131
3410.40.72.132/3010.40.72.133 – 10.40.72.13410.40.72.135
3510.40.72.136/3010.40.72.137 – 10.40.72.13810.40.72.139
3610.40.72.140/3010.40.72.141 – 10.40.72.14210.40.72.143
3710.40.72.144/3010.40.72.145 – 10.40.72.14610.40.72.147
3810.40.72.148/3010.40.72.149 – 10.40.72.15010.40.72.151
3910.40.72.152/3010.40.72.153 – 10.40.72.15410.40.72.155
4010.40.72.156/3010.40.72.157 – 10.40.72.15810.40.72.159
4110.40.72.160/3010.40.72.161 – 10.40.72.16210.40.72.163
4210.40.72.164/3010.40.72.165 – 10.40.72.16610.40.72.167
4310.40.72.168/3010.40.72.169 – 10.40.72.17010.40.72.171
4410.40.72.172/3010.40.72.173 – 10.40.72.17410.40.72.175
4510.40.72.176/3010.40.72.177 – 10.40.72.17810.40.72.179
4610.40.72.180/3010.40.72.181 – 10.40.72.18210.40.72.183
4710.40.72.184/3010.40.72.185 – 10.40.72.18610.40.72.187
4810.40.72.188/3010.40.72.189 – 10.40.72.19010.40.72.191
4910.40.72.192/3010.40.72.193 – 10.40.72.19410.40.72.195
5010.40.72.196/3010.40.72.197 – 10.40.72.19810.40.72.199
5110.40.72.200/3010.40.72.201 – 10.40.72.20210.40.72.203
5210.40.72.204/3010.40.72.205 – 10.40.72.20610.40.72.207
5310.40.72.208/3010.40.72.209 – 10.40.72.21010.40.72.211
5410.40.72.212/3010.40.72.213 – 10.40.72.21410.40.72.215
5510.40.72.216/3010.40.72.217 – 10.40.72.21810.40.72.219
5610.40.72.220/3010.40.72.221 – 10.40.72.22210.40.72.223
5710.40.72.224/3010.40.72.225 – 10.40.72.22610.40.72.227
5810.40.72.228/3010.40.72.229 – 10.40.72.23010.40.72.231
5910.40.72.232/3010.40.72.233 – 10.40.72.23410.40.72.235
6010.40.72.236/3010.40.72.237 – 10.40.72.23810.40.72.239
6110.40.72.240/3010.40.72.241 – 10.40.72.24210.40.72.243
6210.40.72.244/3010.40.72.245 – 10.40.72.24610.40.72.247
6310.40.72.248/3010.40.72.249 – 10.40.72.25010.40.72.251
6410.40.72.252/3010.40.72.253 – 10.40.72.25410.40.72.255
6510.40.73.0/3010.40.73.1 – 10.40.73.210.40.73.3
6610.40.73.4/3010.40.73.5 – 10.40.73.610.40.73.7
6710.40.73.8/3010.40.73.9 – 10.40.73.1010.40.73.11
6810.40.73.12/3010.40.73.13 – 10.40.73.1410.40.73.15
6910.40.73.16/3010.40.73.17 – 10.40.73.1810.40.73.19
7010.40.73.20/3010.40.73.21 – 10.40.73.2210.40.73.23
7110.40.73.24/3010.40.73.25 – 10.40.73.2610.40.73.27
7210.40.73.28/3010.40.73.29 – 10.40.73.3010.40.73.31
7310.40.73.32/3010.40.73.33 – 10.40.73.3410.40.73.35
7410.40.73.36/3010.40.73.37 – 10.40.73.3810.40.73.39
7510.40.73.40/3010.40.73.41 – 10.40.73.4210.40.73.43
7610.40.73.44/3010.40.73.45 – 10.40.73.4610.40.73.47
7710.40.73.48/3010.40.73.49 – 10.40.73.5010.40.73.51
7810.40.73.52/3010.40.73.53 – 10.40.73.5410.40.73.55
7910.40.73.56/3010.40.73.57 – 10.40.73.5810.40.73.59
8010.40.73.60/3010.40.73.61 – 10.40.73.6210.40.73.63
8110.40.73.64/3010.40.73.65 – 10.40.73.6610.40.73.67
8210.40.73.68/3010.40.73.69 – 10.40.73.7010.40.73.71
8310.40.73.72/3010.40.73.73 – 10.40.73.7410.40.73.75
8410.40.73.76/3010.40.73.77 – 10.40.73.7810.40.73.79
8510.40.73.80/3010.40.73.81 – 10.40.73.8210.40.73.83
8610.40.73.84/3010.40.73.85 – 10.40.73.8610.40.73.87
8710.40.73.88/3010.40.73.89 – 10.40.73.9010.40.73.91
8810.40.73.92/3010.40.73.93 – 10.40.73.9410.40.73.95
8910.40.73.96/3010.40.73.97 – 10.40.73.9810.40.73.99
9010.40.73.100/3010.40.73.101 – 10.40.73.10210.40.73.103
9110.40.73.104/3010.40.73.105 – 10.40.73.10610.40.73.107
9210.40.73.108/3010.40.73.109 – 10.40.73.11010.40.73.111
9310.40.73.112/3010.40.73.113 – 10.40.73.11410.40.73.115
9410.40.73.116/3010.40.73.117 – 10.40.73.11810.40.73.119
9510.40.73.120/3010.40.73.121 – 10.40.73.12210.40.73.123
9610.40.73.124/3010.40.73.125 – 10.40.73.12610.40.73.127
9710.40.73.128/3010.40.73.129 – 10.40.73.13010.40.73.131
9810.40.73.132/3010.40.73.133 – 10.40.73.13410.40.73.135
9910.40.73.136/3010.40.73.137 – 10.40.73.13810.40.73.139
10010.40.73.140/3010.40.73.141 – 10.40.73.14210.40.73.143
10110.40.73.144/3010.40.73.145 – 10.40.73.14610.40.73.147
10210.40.73.148/3010.40.73.149 – 10.40.73.15010.40.73.151
10310.40.73.152/3010.40.73.153 – 10.40.73.15410.40.73.155
10410.40.73.156/3010.40.73.157 – 10.40.73.15810.40.73.159
10510.40.73.160/3010.40.73.161 – 10.40.73.16210.40.73.163
10610.40.73.164/3010.40.73.165 – 10.40.73.16610.40.73.167
10710.40.73.168/3010.40.73.169 – 10.40.73.17010.40.73.171
10810.40.73.172/3010.40.73.173 – 10.40.73.17410.40.73.175
10910.40.73.176/3010.40.73.177 – 10.40.73.17810.40.73.179
11010.40.73.180/3010.40.73.181 – 10.40.73.18210.40.73.183
11110.40.73.184/3010.40.73.185 – 10.40.73.18610.40.73.187
11210.40.73.188/3010.40.73.189 – 10.40.73.19010.40.73.191
11310.40.73.192/3010.40.73.193 – 10.40.73.19410.40.73.195
11410.40.73.196/3010.40.73.197 – 10.40.73.19810.40.73.199
11510.40.73.200/3010.40.73.201 – 10.40.73.20210.40.73.203
11610.40.73.204/3010.40.73.205 – 10.40.73.20610.40.73.207
11710.40.73.208/3010.40.73.209 – 10.40.73.21010.40.73.211
11810.40.73.212/3010.40.73.213 – 10.40.73.21410.40.73.215
11910.40.73.216/3010.40.73.217 – 10.40.73.21810.40.73.219
12010.40.73.220/3010.40.73.221 – 10.40.73.22210.40.73.223
12110.40.73.224/3010.40.73.225 – 10.40.73.22610.40.73.227
12210.40.73.228/3010.40.73.229 – 10.40.73.23010.40.73.231
12310.40.73.232/3010.40.73.233 – 10.40.73.23410.40.73.235
12410.40.73.236/3010.40.73.237 – 10.40.73.23810.40.73.239
12510.40.73.240/3010.40.73.241 – 10.40.73.24210.40.73.243
12610.40.73.244/3010.40.73.245 – 10.40.73.24610.40.73.247
12710.40.73.248/3010.40.73.249 – 10.40.73.25010.40.73.251
12810.40.73.252/3010.40.73.253 – 10.40.73.25410.40.73.255
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 →