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)10.72.80.0/23
network10.72.80.0/23
broadcast10.72.81.255
first host10.72.80.1
last host10.72.81.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.72.80.0/23
address00001010.01001000.01010000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001000.01010000.00000000
broadcast00001010.01001000.01010001.11111111
green = network part, grey = host part
hex0x0a485000
decimal172511232
reverse dns0.80.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:5000

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.72.80.0/3010.72.80.1 – 10.72.80.210.72.80.3
210.72.80.4/3010.72.80.5 – 10.72.80.610.72.80.7
310.72.80.8/3010.72.80.9 – 10.72.80.1010.72.80.11
410.72.80.12/3010.72.80.13 – 10.72.80.1410.72.80.15
510.72.80.16/3010.72.80.17 – 10.72.80.1810.72.80.19
610.72.80.20/3010.72.80.21 – 10.72.80.2210.72.80.23
710.72.80.24/3010.72.80.25 – 10.72.80.2610.72.80.27
810.72.80.28/3010.72.80.29 – 10.72.80.3010.72.80.31
910.72.80.32/3010.72.80.33 – 10.72.80.3410.72.80.35
1010.72.80.36/3010.72.80.37 – 10.72.80.3810.72.80.39
1110.72.80.40/3010.72.80.41 – 10.72.80.4210.72.80.43
1210.72.80.44/3010.72.80.45 – 10.72.80.4610.72.80.47
1310.72.80.48/3010.72.80.49 – 10.72.80.5010.72.80.51
1410.72.80.52/3010.72.80.53 – 10.72.80.5410.72.80.55
1510.72.80.56/3010.72.80.57 – 10.72.80.5810.72.80.59
1610.72.80.60/3010.72.80.61 – 10.72.80.6210.72.80.63
1710.72.80.64/3010.72.80.65 – 10.72.80.6610.72.80.67
1810.72.80.68/3010.72.80.69 – 10.72.80.7010.72.80.71
1910.72.80.72/3010.72.80.73 – 10.72.80.7410.72.80.75
2010.72.80.76/3010.72.80.77 – 10.72.80.7810.72.80.79
2110.72.80.80/3010.72.80.81 – 10.72.80.8210.72.80.83
2210.72.80.84/3010.72.80.85 – 10.72.80.8610.72.80.87
2310.72.80.88/3010.72.80.89 – 10.72.80.9010.72.80.91
2410.72.80.92/3010.72.80.93 – 10.72.80.9410.72.80.95
2510.72.80.96/3010.72.80.97 – 10.72.80.9810.72.80.99
2610.72.80.100/3010.72.80.101 – 10.72.80.10210.72.80.103
2710.72.80.104/3010.72.80.105 – 10.72.80.10610.72.80.107
2810.72.80.108/3010.72.80.109 – 10.72.80.11010.72.80.111
2910.72.80.112/3010.72.80.113 – 10.72.80.11410.72.80.115
3010.72.80.116/3010.72.80.117 – 10.72.80.11810.72.80.119
3110.72.80.120/3010.72.80.121 – 10.72.80.12210.72.80.123
3210.72.80.124/3010.72.80.125 – 10.72.80.12610.72.80.127
3310.72.80.128/3010.72.80.129 – 10.72.80.13010.72.80.131
3410.72.80.132/3010.72.80.133 – 10.72.80.13410.72.80.135
3510.72.80.136/3010.72.80.137 – 10.72.80.13810.72.80.139
3610.72.80.140/3010.72.80.141 – 10.72.80.14210.72.80.143
3710.72.80.144/3010.72.80.145 – 10.72.80.14610.72.80.147
3810.72.80.148/3010.72.80.149 – 10.72.80.15010.72.80.151
3910.72.80.152/3010.72.80.153 – 10.72.80.15410.72.80.155
4010.72.80.156/3010.72.80.157 – 10.72.80.15810.72.80.159
4110.72.80.160/3010.72.80.161 – 10.72.80.16210.72.80.163
4210.72.80.164/3010.72.80.165 – 10.72.80.16610.72.80.167
4310.72.80.168/3010.72.80.169 – 10.72.80.17010.72.80.171
4410.72.80.172/3010.72.80.173 – 10.72.80.17410.72.80.175
4510.72.80.176/3010.72.80.177 – 10.72.80.17810.72.80.179
4610.72.80.180/3010.72.80.181 – 10.72.80.18210.72.80.183
4710.72.80.184/3010.72.80.185 – 10.72.80.18610.72.80.187
4810.72.80.188/3010.72.80.189 – 10.72.80.19010.72.80.191
4910.72.80.192/3010.72.80.193 – 10.72.80.19410.72.80.195
5010.72.80.196/3010.72.80.197 – 10.72.80.19810.72.80.199
5110.72.80.200/3010.72.80.201 – 10.72.80.20210.72.80.203
5210.72.80.204/3010.72.80.205 – 10.72.80.20610.72.80.207
5310.72.80.208/3010.72.80.209 – 10.72.80.21010.72.80.211
5410.72.80.212/3010.72.80.213 – 10.72.80.21410.72.80.215
5510.72.80.216/3010.72.80.217 – 10.72.80.21810.72.80.219
5610.72.80.220/3010.72.80.221 – 10.72.80.22210.72.80.223
5710.72.80.224/3010.72.80.225 – 10.72.80.22610.72.80.227
5810.72.80.228/3010.72.80.229 – 10.72.80.23010.72.80.231
5910.72.80.232/3010.72.80.233 – 10.72.80.23410.72.80.235
6010.72.80.236/3010.72.80.237 – 10.72.80.23810.72.80.239
6110.72.80.240/3010.72.80.241 – 10.72.80.24210.72.80.243
6210.72.80.244/3010.72.80.245 – 10.72.80.24610.72.80.247
6310.72.80.248/3010.72.80.249 – 10.72.80.25010.72.80.251
6410.72.80.252/3010.72.80.253 – 10.72.80.25410.72.80.255
6510.72.81.0/3010.72.81.1 – 10.72.81.210.72.81.3
6610.72.81.4/3010.72.81.5 – 10.72.81.610.72.81.7
6710.72.81.8/3010.72.81.9 – 10.72.81.1010.72.81.11
6810.72.81.12/3010.72.81.13 – 10.72.81.1410.72.81.15
6910.72.81.16/3010.72.81.17 – 10.72.81.1810.72.81.19
7010.72.81.20/3010.72.81.21 – 10.72.81.2210.72.81.23
7110.72.81.24/3010.72.81.25 – 10.72.81.2610.72.81.27
7210.72.81.28/3010.72.81.29 – 10.72.81.3010.72.81.31
7310.72.81.32/3010.72.81.33 – 10.72.81.3410.72.81.35
7410.72.81.36/3010.72.81.37 – 10.72.81.3810.72.81.39
7510.72.81.40/3010.72.81.41 – 10.72.81.4210.72.81.43
7610.72.81.44/3010.72.81.45 – 10.72.81.4610.72.81.47
7710.72.81.48/3010.72.81.49 – 10.72.81.5010.72.81.51
7810.72.81.52/3010.72.81.53 – 10.72.81.5410.72.81.55
7910.72.81.56/3010.72.81.57 – 10.72.81.5810.72.81.59
8010.72.81.60/3010.72.81.61 – 10.72.81.6210.72.81.63
8110.72.81.64/3010.72.81.65 – 10.72.81.6610.72.81.67
8210.72.81.68/3010.72.81.69 – 10.72.81.7010.72.81.71
8310.72.81.72/3010.72.81.73 – 10.72.81.7410.72.81.75
8410.72.81.76/3010.72.81.77 – 10.72.81.7810.72.81.79
8510.72.81.80/3010.72.81.81 – 10.72.81.8210.72.81.83
8610.72.81.84/3010.72.81.85 – 10.72.81.8610.72.81.87
8710.72.81.88/3010.72.81.89 – 10.72.81.9010.72.81.91
8810.72.81.92/3010.72.81.93 – 10.72.81.9410.72.81.95
8910.72.81.96/3010.72.81.97 – 10.72.81.9810.72.81.99
9010.72.81.100/3010.72.81.101 – 10.72.81.10210.72.81.103
9110.72.81.104/3010.72.81.105 – 10.72.81.10610.72.81.107
9210.72.81.108/3010.72.81.109 – 10.72.81.11010.72.81.111
9310.72.81.112/3010.72.81.113 – 10.72.81.11410.72.81.115
9410.72.81.116/3010.72.81.117 – 10.72.81.11810.72.81.119
9510.72.81.120/3010.72.81.121 – 10.72.81.12210.72.81.123
9610.72.81.124/3010.72.81.125 – 10.72.81.12610.72.81.127
9710.72.81.128/3010.72.81.129 – 10.72.81.13010.72.81.131
9810.72.81.132/3010.72.81.133 – 10.72.81.13410.72.81.135
9910.72.81.136/3010.72.81.137 – 10.72.81.13810.72.81.139
10010.72.81.140/3010.72.81.141 – 10.72.81.14210.72.81.143
10110.72.81.144/3010.72.81.145 – 10.72.81.14610.72.81.147
10210.72.81.148/3010.72.81.149 – 10.72.81.15010.72.81.151
10310.72.81.152/3010.72.81.153 – 10.72.81.15410.72.81.155
10410.72.81.156/3010.72.81.157 – 10.72.81.15810.72.81.159
10510.72.81.160/3010.72.81.161 – 10.72.81.16210.72.81.163
10610.72.81.164/3010.72.81.165 – 10.72.81.16610.72.81.167
10710.72.81.168/3010.72.81.169 – 10.72.81.17010.72.81.171
10810.72.81.172/3010.72.81.173 – 10.72.81.17410.72.81.175
10910.72.81.176/3010.72.81.177 – 10.72.81.17810.72.81.179
11010.72.81.180/3010.72.81.181 – 10.72.81.18210.72.81.183
11110.72.81.184/3010.72.81.185 – 10.72.81.18610.72.81.187
11210.72.81.188/3010.72.81.189 – 10.72.81.19010.72.81.191
11310.72.81.192/3010.72.81.193 – 10.72.81.19410.72.81.195
11410.72.81.196/3010.72.81.197 – 10.72.81.19810.72.81.199
11510.72.81.200/3010.72.81.201 – 10.72.81.20210.72.81.203
11610.72.81.204/3010.72.81.205 – 10.72.81.20610.72.81.207
11710.72.81.208/3010.72.81.209 – 10.72.81.21010.72.81.211
11810.72.81.212/3010.72.81.213 – 10.72.81.21410.72.81.215
11910.72.81.216/3010.72.81.217 – 10.72.81.21810.72.81.219
12010.72.81.220/3010.72.81.221 – 10.72.81.22210.72.81.223
12110.72.81.224/3010.72.81.225 – 10.72.81.22610.72.81.227
12210.72.81.228/3010.72.81.229 – 10.72.81.23010.72.81.231
12310.72.81.232/3010.72.81.233 – 10.72.81.23410.72.81.235
12410.72.81.236/3010.72.81.237 – 10.72.81.23810.72.81.239
12510.72.81.240/3010.72.81.241 – 10.72.81.24210.72.81.243
12610.72.81.244/3010.72.81.245 – 10.72.81.24610.72.81.247
12710.72.81.248/3010.72.81.249 – 10.72.81.25010.72.81.251
12810.72.81.252/3010.72.81.253 – 10.72.81.25410.72.81.255
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 →