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)10.72.16.0/23
network10.72.16.0/23
broadcast10.72.17.255
first host10.72.16.1
last host10.72.17.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.72.16.0/23
address00001010.01001000.00010000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001000.00010000.00000000
broadcast00001010.01001000.00010001.11111111
green = network part, grey = host part
hex0x0a481000
decimal172494848
reverse dns0.16.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:1000

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.72.16.0/3010.72.16.1 – 10.72.16.210.72.16.3
210.72.16.4/3010.72.16.5 – 10.72.16.610.72.16.7
310.72.16.8/3010.72.16.9 – 10.72.16.1010.72.16.11
410.72.16.12/3010.72.16.13 – 10.72.16.1410.72.16.15
510.72.16.16/3010.72.16.17 – 10.72.16.1810.72.16.19
610.72.16.20/3010.72.16.21 – 10.72.16.2210.72.16.23
710.72.16.24/3010.72.16.25 – 10.72.16.2610.72.16.27
810.72.16.28/3010.72.16.29 – 10.72.16.3010.72.16.31
910.72.16.32/3010.72.16.33 – 10.72.16.3410.72.16.35
1010.72.16.36/3010.72.16.37 – 10.72.16.3810.72.16.39
1110.72.16.40/3010.72.16.41 – 10.72.16.4210.72.16.43
1210.72.16.44/3010.72.16.45 – 10.72.16.4610.72.16.47
1310.72.16.48/3010.72.16.49 – 10.72.16.5010.72.16.51
1410.72.16.52/3010.72.16.53 – 10.72.16.5410.72.16.55
1510.72.16.56/3010.72.16.57 – 10.72.16.5810.72.16.59
1610.72.16.60/3010.72.16.61 – 10.72.16.6210.72.16.63
1710.72.16.64/3010.72.16.65 – 10.72.16.6610.72.16.67
1810.72.16.68/3010.72.16.69 – 10.72.16.7010.72.16.71
1910.72.16.72/3010.72.16.73 – 10.72.16.7410.72.16.75
2010.72.16.76/3010.72.16.77 – 10.72.16.7810.72.16.79
2110.72.16.80/3010.72.16.81 – 10.72.16.8210.72.16.83
2210.72.16.84/3010.72.16.85 – 10.72.16.8610.72.16.87
2310.72.16.88/3010.72.16.89 – 10.72.16.9010.72.16.91
2410.72.16.92/3010.72.16.93 – 10.72.16.9410.72.16.95
2510.72.16.96/3010.72.16.97 – 10.72.16.9810.72.16.99
2610.72.16.100/3010.72.16.101 – 10.72.16.10210.72.16.103
2710.72.16.104/3010.72.16.105 – 10.72.16.10610.72.16.107
2810.72.16.108/3010.72.16.109 – 10.72.16.11010.72.16.111
2910.72.16.112/3010.72.16.113 – 10.72.16.11410.72.16.115
3010.72.16.116/3010.72.16.117 – 10.72.16.11810.72.16.119
3110.72.16.120/3010.72.16.121 – 10.72.16.12210.72.16.123
3210.72.16.124/3010.72.16.125 – 10.72.16.12610.72.16.127
3310.72.16.128/3010.72.16.129 – 10.72.16.13010.72.16.131
3410.72.16.132/3010.72.16.133 – 10.72.16.13410.72.16.135
3510.72.16.136/3010.72.16.137 – 10.72.16.13810.72.16.139
3610.72.16.140/3010.72.16.141 – 10.72.16.14210.72.16.143
3710.72.16.144/3010.72.16.145 – 10.72.16.14610.72.16.147
3810.72.16.148/3010.72.16.149 – 10.72.16.15010.72.16.151
3910.72.16.152/3010.72.16.153 – 10.72.16.15410.72.16.155
4010.72.16.156/3010.72.16.157 – 10.72.16.15810.72.16.159
4110.72.16.160/3010.72.16.161 – 10.72.16.16210.72.16.163
4210.72.16.164/3010.72.16.165 – 10.72.16.16610.72.16.167
4310.72.16.168/3010.72.16.169 – 10.72.16.17010.72.16.171
4410.72.16.172/3010.72.16.173 – 10.72.16.17410.72.16.175
4510.72.16.176/3010.72.16.177 – 10.72.16.17810.72.16.179
4610.72.16.180/3010.72.16.181 – 10.72.16.18210.72.16.183
4710.72.16.184/3010.72.16.185 – 10.72.16.18610.72.16.187
4810.72.16.188/3010.72.16.189 – 10.72.16.19010.72.16.191
4910.72.16.192/3010.72.16.193 – 10.72.16.19410.72.16.195
5010.72.16.196/3010.72.16.197 – 10.72.16.19810.72.16.199
5110.72.16.200/3010.72.16.201 – 10.72.16.20210.72.16.203
5210.72.16.204/3010.72.16.205 – 10.72.16.20610.72.16.207
5310.72.16.208/3010.72.16.209 – 10.72.16.21010.72.16.211
5410.72.16.212/3010.72.16.213 – 10.72.16.21410.72.16.215
5510.72.16.216/3010.72.16.217 – 10.72.16.21810.72.16.219
5610.72.16.220/3010.72.16.221 – 10.72.16.22210.72.16.223
5710.72.16.224/3010.72.16.225 – 10.72.16.22610.72.16.227
5810.72.16.228/3010.72.16.229 – 10.72.16.23010.72.16.231
5910.72.16.232/3010.72.16.233 – 10.72.16.23410.72.16.235
6010.72.16.236/3010.72.16.237 – 10.72.16.23810.72.16.239
6110.72.16.240/3010.72.16.241 – 10.72.16.24210.72.16.243
6210.72.16.244/3010.72.16.245 – 10.72.16.24610.72.16.247
6310.72.16.248/3010.72.16.249 – 10.72.16.25010.72.16.251
6410.72.16.252/3010.72.16.253 – 10.72.16.25410.72.16.255
6510.72.17.0/3010.72.17.1 – 10.72.17.210.72.17.3
6610.72.17.4/3010.72.17.5 – 10.72.17.610.72.17.7
6710.72.17.8/3010.72.17.9 – 10.72.17.1010.72.17.11
6810.72.17.12/3010.72.17.13 – 10.72.17.1410.72.17.15
6910.72.17.16/3010.72.17.17 – 10.72.17.1810.72.17.19
7010.72.17.20/3010.72.17.21 – 10.72.17.2210.72.17.23
7110.72.17.24/3010.72.17.25 – 10.72.17.2610.72.17.27
7210.72.17.28/3010.72.17.29 – 10.72.17.3010.72.17.31
7310.72.17.32/3010.72.17.33 – 10.72.17.3410.72.17.35
7410.72.17.36/3010.72.17.37 – 10.72.17.3810.72.17.39
7510.72.17.40/3010.72.17.41 – 10.72.17.4210.72.17.43
7610.72.17.44/3010.72.17.45 – 10.72.17.4610.72.17.47
7710.72.17.48/3010.72.17.49 – 10.72.17.5010.72.17.51
7810.72.17.52/3010.72.17.53 – 10.72.17.5410.72.17.55
7910.72.17.56/3010.72.17.57 – 10.72.17.5810.72.17.59
8010.72.17.60/3010.72.17.61 – 10.72.17.6210.72.17.63
8110.72.17.64/3010.72.17.65 – 10.72.17.6610.72.17.67
8210.72.17.68/3010.72.17.69 – 10.72.17.7010.72.17.71
8310.72.17.72/3010.72.17.73 – 10.72.17.7410.72.17.75
8410.72.17.76/3010.72.17.77 – 10.72.17.7810.72.17.79
8510.72.17.80/3010.72.17.81 – 10.72.17.8210.72.17.83
8610.72.17.84/3010.72.17.85 – 10.72.17.8610.72.17.87
8710.72.17.88/3010.72.17.89 – 10.72.17.9010.72.17.91
8810.72.17.92/3010.72.17.93 – 10.72.17.9410.72.17.95
8910.72.17.96/3010.72.17.97 – 10.72.17.9810.72.17.99
9010.72.17.100/3010.72.17.101 – 10.72.17.10210.72.17.103
9110.72.17.104/3010.72.17.105 – 10.72.17.10610.72.17.107
9210.72.17.108/3010.72.17.109 – 10.72.17.11010.72.17.111
9310.72.17.112/3010.72.17.113 – 10.72.17.11410.72.17.115
9410.72.17.116/3010.72.17.117 – 10.72.17.11810.72.17.119
9510.72.17.120/3010.72.17.121 – 10.72.17.12210.72.17.123
9610.72.17.124/3010.72.17.125 – 10.72.17.12610.72.17.127
9710.72.17.128/3010.72.17.129 – 10.72.17.13010.72.17.131
9810.72.17.132/3010.72.17.133 – 10.72.17.13410.72.17.135
9910.72.17.136/3010.72.17.137 – 10.72.17.13810.72.17.139
10010.72.17.140/3010.72.17.141 – 10.72.17.14210.72.17.143
10110.72.17.144/3010.72.17.145 – 10.72.17.14610.72.17.147
10210.72.17.148/3010.72.17.149 – 10.72.17.15010.72.17.151
10310.72.17.152/3010.72.17.153 – 10.72.17.15410.72.17.155
10410.72.17.156/3010.72.17.157 – 10.72.17.15810.72.17.159
10510.72.17.160/3010.72.17.161 – 10.72.17.16210.72.17.163
10610.72.17.164/3010.72.17.165 – 10.72.17.16610.72.17.167
10710.72.17.168/3010.72.17.169 – 10.72.17.17010.72.17.171
10810.72.17.172/3010.72.17.173 – 10.72.17.17410.72.17.175
10910.72.17.176/3010.72.17.177 – 10.72.17.17810.72.17.179
11010.72.17.180/3010.72.17.181 – 10.72.17.18210.72.17.183
11110.72.17.184/3010.72.17.185 – 10.72.17.18610.72.17.187
11210.72.17.188/3010.72.17.189 – 10.72.17.19010.72.17.191
11310.72.17.192/3010.72.17.193 – 10.72.17.19410.72.17.195
11410.72.17.196/3010.72.17.197 – 10.72.17.19810.72.17.199
11510.72.17.200/3010.72.17.201 – 10.72.17.20210.72.17.203
11610.72.17.204/3010.72.17.205 – 10.72.17.20610.72.17.207
11710.72.17.208/3010.72.17.209 – 10.72.17.21010.72.17.211
11810.72.17.212/3010.72.17.213 – 10.72.17.21410.72.17.215
11910.72.17.216/3010.72.17.217 – 10.72.17.21810.72.17.219
12010.72.17.220/3010.72.17.221 – 10.72.17.22210.72.17.223
12110.72.17.224/3010.72.17.225 – 10.72.17.22610.72.17.227
12210.72.17.228/3010.72.17.229 – 10.72.17.23010.72.17.231
12310.72.17.232/3010.72.17.233 – 10.72.17.23410.72.17.235
12410.72.17.236/3010.72.17.237 – 10.72.17.23810.72.17.239
12510.72.17.240/3010.72.17.241 – 10.72.17.24210.72.17.243
12610.72.17.244/3010.72.17.245 – 10.72.17.24610.72.17.247
12710.72.17.248/3010.72.17.249 – 10.72.17.25010.72.17.251
12810.72.17.252/3010.72.17.253 – 10.72.17.25410.72.17.255
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 →