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)10.3.72.0/23
network10.3.72.0/23
broadcast10.3.73.255
first host10.3.72.1
last host10.3.73.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.3.72.0/23
address00001010.00000011.01001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000011.01001000.00000000
broadcast00001010.00000011.01001001.11111111
green = network part, grey = host part
hex0x0a034800
decimal167987200
reverse dns0.72.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4800

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.3.72.0/3010.3.72.1 – 10.3.72.210.3.72.3
210.3.72.4/3010.3.72.5 – 10.3.72.610.3.72.7
310.3.72.8/3010.3.72.9 – 10.3.72.1010.3.72.11
410.3.72.12/3010.3.72.13 – 10.3.72.1410.3.72.15
510.3.72.16/3010.3.72.17 – 10.3.72.1810.3.72.19
610.3.72.20/3010.3.72.21 – 10.3.72.2210.3.72.23
710.3.72.24/3010.3.72.25 – 10.3.72.2610.3.72.27
810.3.72.28/3010.3.72.29 – 10.3.72.3010.3.72.31
910.3.72.32/3010.3.72.33 – 10.3.72.3410.3.72.35
1010.3.72.36/3010.3.72.37 – 10.3.72.3810.3.72.39
1110.3.72.40/3010.3.72.41 – 10.3.72.4210.3.72.43
1210.3.72.44/3010.3.72.45 – 10.3.72.4610.3.72.47
1310.3.72.48/3010.3.72.49 – 10.3.72.5010.3.72.51
1410.3.72.52/3010.3.72.53 – 10.3.72.5410.3.72.55
1510.3.72.56/3010.3.72.57 – 10.3.72.5810.3.72.59
1610.3.72.60/3010.3.72.61 – 10.3.72.6210.3.72.63
1710.3.72.64/3010.3.72.65 – 10.3.72.6610.3.72.67
1810.3.72.68/3010.3.72.69 – 10.3.72.7010.3.72.71
1910.3.72.72/3010.3.72.73 – 10.3.72.7410.3.72.75
2010.3.72.76/3010.3.72.77 – 10.3.72.7810.3.72.79
2110.3.72.80/3010.3.72.81 – 10.3.72.8210.3.72.83
2210.3.72.84/3010.3.72.85 – 10.3.72.8610.3.72.87
2310.3.72.88/3010.3.72.89 – 10.3.72.9010.3.72.91
2410.3.72.92/3010.3.72.93 – 10.3.72.9410.3.72.95
2510.3.72.96/3010.3.72.97 – 10.3.72.9810.3.72.99
2610.3.72.100/3010.3.72.101 – 10.3.72.10210.3.72.103
2710.3.72.104/3010.3.72.105 – 10.3.72.10610.3.72.107
2810.3.72.108/3010.3.72.109 – 10.3.72.11010.3.72.111
2910.3.72.112/3010.3.72.113 – 10.3.72.11410.3.72.115
3010.3.72.116/3010.3.72.117 – 10.3.72.11810.3.72.119
3110.3.72.120/3010.3.72.121 – 10.3.72.12210.3.72.123
3210.3.72.124/3010.3.72.125 – 10.3.72.12610.3.72.127
3310.3.72.128/3010.3.72.129 – 10.3.72.13010.3.72.131
3410.3.72.132/3010.3.72.133 – 10.3.72.13410.3.72.135
3510.3.72.136/3010.3.72.137 – 10.3.72.13810.3.72.139
3610.3.72.140/3010.3.72.141 – 10.3.72.14210.3.72.143
3710.3.72.144/3010.3.72.145 – 10.3.72.14610.3.72.147
3810.3.72.148/3010.3.72.149 – 10.3.72.15010.3.72.151
3910.3.72.152/3010.3.72.153 – 10.3.72.15410.3.72.155
4010.3.72.156/3010.3.72.157 – 10.3.72.15810.3.72.159
4110.3.72.160/3010.3.72.161 – 10.3.72.16210.3.72.163
4210.3.72.164/3010.3.72.165 – 10.3.72.16610.3.72.167
4310.3.72.168/3010.3.72.169 – 10.3.72.17010.3.72.171
4410.3.72.172/3010.3.72.173 – 10.3.72.17410.3.72.175
4510.3.72.176/3010.3.72.177 – 10.3.72.17810.3.72.179
4610.3.72.180/3010.3.72.181 – 10.3.72.18210.3.72.183
4710.3.72.184/3010.3.72.185 – 10.3.72.18610.3.72.187
4810.3.72.188/3010.3.72.189 – 10.3.72.19010.3.72.191
4910.3.72.192/3010.3.72.193 – 10.3.72.19410.3.72.195
5010.3.72.196/3010.3.72.197 – 10.3.72.19810.3.72.199
5110.3.72.200/3010.3.72.201 – 10.3.72.20210.3.72.203
5210.3.72.204/3010.3.72.205 – 10.3.72.20610.3.72.207
5310.3.72.208/3010.3.72.209 – 10.3.72.21010.3.72.211
5410.3.72.212/3010.3.72.213 – 10.3.72.21410.3.72.215
5510.3.72.216/3010.3.72.217 – 10.3.72.21810.3.72.219
5610.3.72.220/3010.3.72.221 – 10.3.72.22210.3.72.223
5710.3.72.224/3010.3.72.225 – 10.3.72.22610.3.72.227
5810.3.72.228/3010.3.72.229 – 10.3.72.23010.3.72.231
5910.3.72.232/3010.3.72.233 – 10.3.72.23410.3.72.235
6010.3.72.236/3010.3.72.237 – 10.3.72.23810.3.72.239
6110.3.72.240/3010.3.72.241 – 10.3.72.24210.3.72.243
6210.3.72.244/3010.3.72.245 – 10.3.72.24610.3.72.247
6310.3.72.248/3010.3.72.249 – 10.3.72.25010.3.72.251
6410.3.72.252/3010.3.72.253 – 10.3.72.25410.3.72.255
6510.3.73.0/3010.3.73.1 – 10.3.73.210.3.73.3
6610.3.73.4/3010.3.73.5 – 10.3.73.610.3.73.7
6710.3.73.8/3010.3.73.9 – 10.3.73.1010.3.73.11
6810.3.73.12/3010.3.73.13 – 10.3.73.1410.3.73.15
6910.3.73.16/3010.3.73.17 – 10.3.73.1810.3.73.19
7010.3.73.20/3010.3.73.21 – 10.3.73.2210.3.73.23
7110.3.73.24/3010.3.73.25 – 10.3.73.2610.3.73.27
7210.3.73.28/3010.3.73.29 – 10.3.73.3010.3.73.31
7310.3.73.32/3010.3.73.33 – 10.3.73.3410.3.73.35
7410.3.73.36/3010.3.73.37 – 10.3.73.3810.3.73.39
7510.3.73.40/3010.3.73.41 – 10.3.73.4210.3.73.43
7610.3.73.44/3010.3.73.45 – 10.3.73.4610.3.73.47
7710.3.73.48/3010.3.73.49 – 10.3.73.5010.3.73.51
7810.3.73.52/3010.3.73.53 – 10.3.73.5410.3.73.55
7910.3.73.56/3010.3.73.57 – 10.3.73.5810.3.73.59
8010.3.73.60/3010.3.73.61 – 10.3.73.6210.3.73.63
8110.3.73.64/3010.3.73.65 – 10.3.73.6610.3.73.67
8210.3.73.68/3010.3.73.69 – 10.3.73.7010.3.73.71
8310.3.73.72/3010.3.73.73 – 10.3.73.7410.3.73.75
8410.3.73.76/3010.3.73.77 – 10.3.73.7810.3.73.79
8510.3.73.80/3010.3.73.81 – 10.3.73.8210.3.73.83
8610.3.73.84/3010.3.73.85 – 10.3.73.8610.3.73.87
8710.3.73.88/3010.3.73.89 – 10.3.73.9010.3.73.91
8810.3.73.92/3010.3.73.93 – 10.3.73.9410.3.73.95
8910.3.73.96/3010.3.73.97 – 10.3.73.9810.3.73.99
9010.3.73.100/3010.3.73.101 – 10.3.73.10210.3.73.103
9110.3.73.104/3010.3.73.105 – 10.3.73.10610.3.73.107
9210.3.73.108/3010.3.73.109 – 10.3.73.11010.3.73.111
9310.3.73.112/3010.3.73.113 – 10.3.73.11410.3.73.115
9410.3.73.116/3010.3.73.117 – 10.3.73.11810.3.73.119
9510.3.73.120/3010.3.73.121 – 10.3.73.12210.3.73.123
9610.3.73.124/3010.3.73.125 – 10.3.73.12610.3.73.127
9710.3.73.128/3010.3.73.129 – 10.3.73.13010.3.73.131
9810.3.73.132/3010.3.73.133 – 10.3.73.13410.3.73.135
9910.3.73.136/3010.3.73.137 – 10.3.73.13810.3.73.139
10010.3.73.140/3010.3.73.141 – 10.3.73.14210.3.73.143
10110.3.73.144/3010.3.73.145 – 10.3.73.14610.3.73.147
10210.3.73.148/3010.3.73.149 – 10.3.73.15010.3.73.151
10310.3.73.152/3010.3.73.153 – 10.3.73.15410.3.73.155
10410.3.73.156/3010.3.73.157 – 10.3.73.15810.3.73.159
10510.3.73.160/3010.3.73.161 – 10.3.73.16210.3.73.163
10610.3.73.164/3010.3.73.165 – 10.3.73.16610.3.73.167
10710.3.73.168/3010.3.73.169 – 10.3.73.17010.3.73.171
10810.3.73.172/3010.3.73.173 – 10.3.73.17410.3.73.175
10910.3.73.176/3010.3.73.177 – 10.3.73.17810.3.73.179
11010.3.73.180/3010.3.73.181 – 10.3.73.18210.3.73.183
11110.3.73.184/3010.3.73.185 – 10.3.73.18610.3.73.187
11210.3.73.188/3010.3.73.189 – 10.3.73.19010.3.73.191
11310.3.73.192/3010.3.73.193 – 10.3.73.19410.3.73.195
11410.3.73.196/3010.3.73.197 – 10.3.73.19810.3.73.199
11510.3.73.200/3010.3.73.201 – 10.3.73.20210.3.73.203
11610.3.73.204/3010.3.73.205 – 10.3.73.20610.3.73.207
11710.3.73.208/3010.3.73.209 – 10.3.73.21010.3.73.211
11810.3.73.212/3010.3.73.213 – 10.3.73.21410.3.73.215
11910.3.73.216/3010.3.73.217 – 10.3.73.21810.3.73.219
12010.3.73.220/3010.3.73.221 – 10.3.73.22210.3.73.223
12110.3.73.224/3010.3.73.225 – 10.3.73.22610.3.73.227
12210.3.73.228/3010.3.73.229 – 10.3.73.23010.3.73.231
12310.3.73.232/3010.3.73.233 – 10.3.73.23410.3.73.235
12410.3.73.236/3010.3.73.237 – 10.3.73.23810.3.73.239
12510.3.73.240/3010.3.73.241 – 10.3.73.24210.3.73.243
12610.3.73.244/3010.3.73.245 – 10.3.73.24610.3.73.247
12710.3.73.248/3010.3.73.249 – 10.3.73.25010.3.73.251
12810.3.73.252/3010.3.73.253 – 10.3.73.25410.3.73.255
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 →