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)10.1.72.0/23
network10.1.72.0/23
broadcast10.1.73.255
first host10.1.72.1
last host10.1.73.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.1.72.0/23
address00001010.00000001.01001000.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000001.01001000.00000000
broadcast00001010.00000001.01001001.11111111
green = network part, grey = host part
hex0x0a014800
decimal167856128
reverse dns0.72.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:4800

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.1.72.0/3010.1.72.1 – 10.1.72.210.1.72.3
210.1.72.4/3010.1.72.5 – 10.1.72.610.1.72.7
310.1.72.8/3010.1.72.9 – 10.1.72.1010.1.72.11
410.1.72.12/3010.1.72.13 – 10.1.72.1410.1.72.15
510.1.72.16/3010.1.72.17 – 10.1.72.1810.1.72.19
610.1.72.20/3010.1.72.21 – 10.1.72.2210.1.72.23
710.1.72.24/3010.1.72.25 – 10.1.72.2610.1.72.27
810.1.72.28/3010.1.72.29 – 10.1.72.3010.1.72.31
910.1.72.32/3010.1.72.33 – 10.1.72.3410.1.72.35
1010.1.72.36/3010.1.72.37 – 10.1.72.3810.1.72.39
1110.1.72.40/3010.1.72.41 – 10.1.72.4210.1.72.43
1210.1.72.44/3010.1.72.45 – 10.1.72.4610.1.72.47
1310.1.72.48/3010.1.72.49 – 10.1.72.5010.1.72.51
1410.1.72.52/3010.1.72.53 – 10.1.72.5410.1.72.55
1510.1.72.56/3010.1.72.57 – 10.1.72.5810.1.72.59
1610.1.72.60/3010.1.72.61 – 10.1.72.6210.1.72.63
1710.1.72.64/3010.1.72.65 – 10.1.72.6610.1.72.67
1810.1.72.68/3010.1.72.69 – 10.1.72.7010.1.72.71
1910.1.72.72/3010.1.72.73 – 10.1.72.7410.1.72.75
2010.1.72.76/3010.1.72.77 – 10.1.72.7810.1.72.79
2110.1.72.80/3010.1.72.81 – 10.1.72.8210.1.72.83
2210.1.72.84/3010.1.72.85 – 10.1.72.8610.1.72.87
2310.1.72.88/3010.1.72.89 – 10.1.72.9010.1.72.91
2410.1.72.92/3010.1.72.93 – 10.1.72.9410.1.72.95
2510.1.72.96/3010.1.72.97 – 10.1.72.9810.1.72.99
2610.1.72.100/3010.1.72.101 – 10.1.72.10210.1.72.103
2710.1.72.104/3010.1.72.105 – 10.1.72.10610.1.72.107
2810.1.72.108/3010.1.72.109 – 10.1.72.11010.1.72.111
2910.1.72.112/3010.1.72.113 – 10.1.72.11410.1.72.115
3010.1.72.116/3010.1.72.117 – 10.1.72.11810.1.72.119
3110.1.72.120/3010.1.72.121 – 10.1.72.12210.1.72.123
3210.1.72.124/3010.1.72.125 – 10.1.72.12610.1.72.127
3310.1.72.128/3010.1.72.129 – 10.1.72.13010.1.72.131
3410.1.72.132/3010.1.72.133 – 10.1.72.13410.1.72.135
3510.1.72.136/3010.1.72.137 – 10.1.72.13810.1.72.139
3610.1.72.140/3010.1.72.141 – 10.1.72.14210.1.72.143
3710.1.72.144/3010.1.72.145 – 10.1.72.14610.1.72.147
3810.1.72.148/3010.1.72.149 – 10.1.72.15010.1.72.151
3910.1.72.152/3010.1.72.153 – 10.1.72.15410.1.72.155
4010.1.72.156/3010.1.72.157 – 10.1.72.15810.1.72.159
4110.1.72.160/3010.1.72.161 – 10.1.72.16210.1.72.163
4210.1.72.164/3010.1.72.165 – 10.1.72.16610.1.72.167
4310.1.72.168/3010.1.72.169 – 10.1.72.17010.1.72.171
4410.1.72.172/3010.1.72.173 – 10.1.72.17410.1.72.175
4510.1.72.176/3010.1.72.177 – 10.1.72.17810.1.72.179
4610.1.72.180/3010.1.72.181 – 10.1.72.18210.1.72.183
4710.1.72.184/3010.1.72.185 – 10.1.72.18610.1.72.187
4810.1.72.188/3010.1.72.189 – 10.1.72.19010.1.72.191
4910.1.72.192/3010.1.72.193 – 10.1.72.19410.1.72.195
5010.1.72.196/3010.1.72.197 – 10.1.72.19810.1.72.199
5110.1.72.200/3010.1.72.201 – 10.1.72.20210.1.72.203
5210.1.72.204/3010.1.72.205 – 10.1.72.20610.1.72.207
5310.1.72.208/3010.1.72.209 – 10.1.72.21010.1.72.211
5410.1.72.212/3010.1.72.213 – 10.1.72.21410.1.72.215
5510.1.72.216/3010.1.72.217 – 10.1.72.21810.1.72.219
5610.1.72.220/3010.1.72.221 – 10.1.72.22210.1.72.223
5710.1.72.224/3010.1.72.225 – 10.1.72.22610.1.72.227
5810.1.72.228/3010.1.72.229 – 10.1.72.23010.1.72.231
5910.1.72.232/3010.1.72.233 – 10.1.72.23410.1.72.235
6010.1.72.236/3010.1.72.237 – 10.1.72.23810.1.72.239
6110.1.72.240/3010.1.72.241 – 10.1.72.24210.1.72.243
6210.1.72.244/3010.1.72.245 – 10.1.72.24610.1.72.247
6310.1.72.248/3010.1.72.249 – 10.1.72.25010.1.72.251
6410.1.72.252/3010.1.72.253 – 10.1.72.25410.1.72.255
6510.1.73.0/3010.1.73.1 – 10.1.73.210.1.73.3
6610.1.73.4/3010.1.73.5 – 10.1.73.610.1.73.7
6710.1.73.8/3010.1.73.9 – 10.1.73.1010.1.73.11
6810.1.73.12/3010.1.73.13 – 10.1.73.1410.1.73.15
6910.1.73.16/3010.1.73.17 – 10.1.73.1810.1.73.19
7010.1.73.20/3010.1.73.21 – 10.1.73.2210.1.73.23
7110.1.73.24/3010.1.73.25 – 10.1.73.2610.1.73.27
7210.1.73.28/3010.1.73.29 – 10.1.73.3010.1.73.31
7310.1.73.32/3010.1.73.33 – 10.1.73.3410.1.73.35
7410.1.73.36/3010.1.73.37 – 10.1.73.3810.1.73.39
7510.1.73.40/3010.1.73.41 – 10.1.73.4210.1.73.43
7610.1.73.44/3010.1.73.45 – 10.1.73.4610.1.73.47
7710.1.73.48/3010.1.73.49 – 10.1.73.5010.1.73.51
7810.1.73.52/3010.1.73.53 – 10.1.73.5410.1.73.55
7910.1.73.56/3010.1.73.57 – 10.1.73.5810.1.73.59
8010.1.73.60/3010.1.73.61 – 10.1.73.6210.1.73.63
8110.1.73.64/3010.1.73.65 – 10.1.73.6610.1.73.67
8210.1.73.68/3010.1.73.69 – 10.1.73.7010.1.73.71
8310.1.73.72/3010.1.73.73 – 10.1.73.7410.1.73.75
8410.1.73.76/3010.1.73.77 – 10.1.73.7810.1.73.79
8510.1.73.80/3010.1.73.81 – 10.1.73.8210.1.73.83
8610.1.73.84/3010.1.73.85 – 10.1.73.8610.1.73.87
8710.1.73.88/3010.1.73.89 – 10.1.73.9010.1.73.91
8810.1.73.92/3010.1.73.93 – 10.1.73.9410.1.73.95
8910.1.73.96/3010.1.73.97 – 10.1.73.9810.1.73.99
9010.1.73.100/3010.1.73.101 – 10.1.73.10210.1.73.103
9110.1.73.104/3010.1.73.105 – 10.1.73.10610.1.73.107
9210.1.73.108/3010.1.73.109 – 10.1.73.11010.1.73.111
9310.1.73.112/3010.1.73.113 – 10.1.73.11410.1.73.115
9410.1.73.116/3010.1.73.117 – 10.1.73.11810.1.73.119
9510.1.73.120/3010.1.73.121 – 10.1.73.12210.1.73.123
9610.1.73.124/3010.1.73.125 – 10.1.73.12610.1.73.127
9710.1.73.128/3010.1.73.129 – 10.1.73.13010.1.73.131
9810.1.73.132/3010.1.73.133 – 10.1.73.13410.1.73.135
9910.1.73.136/3010.1.73.137 – 10.1.73.13810.1.73.139
10010.1.73.140/3010.1.73.141 – 10.1.73.14210.1.73.143
10110.1.73.144/3010.1.73.145 – 10.1.73.14610.1.73.147
10210.1.73.148/3010.1.73.149 – 10.1.73.15010.1.73.151
10310.1.73.152/3010.1.73.153 – 10.1.73.15410.1.73.155
10410.1.73.156/3010.1.73.157 – 10.1.73.15810.1.73.159
10510.1.73.160/3010.1.73.161 – 10.1.73.16210.1.73.163
10610.1.73.164/3010.1.73.165 – 10.1.73.16610.1.73.167
10710.1.73.168/3010.1.73.169 – 10.1.73.17010.1.73.171
10810.1.73.172/3010.1.73.173 – 10.1.73.17410.1.73.175
10910.1.73.176/3010.1.73.177 – 10.1.73.17810.1.73.179
11010.1.73.180/3010.1.73.181 – 10.1.73.18210.1.73.183
11110.1.73.184/3010.1.73.185 – 10.1.73.18610.1.73.187
11210.1.73.188/3010.1.73.189 – 10.1.73.19010.1.73.191
11310.1.73.192/3010.1.73.193 – 10.1.73.19410.1.73.195
11410.1.73.196/3010.1.73.197 – 10.1.73.19810.1.73.199
11510.1.73.200/3010.1.73.201 – 10.1.73.20210.1.73.203
11610.1.73.204/3010.1.73.205 – 10.1.73.20610.1.73.207
11710.1.73.208/3010.1.73.209 – 10.1.73.21010.1.73.211
11810.1.73.212/3010.1.73.213 – 10.1.73.21410.1.73.215
11910.1.73.216/3010.1.73.217 – 10.1.73.21810.1.73.219
12010.1.73.220/3010.1.73.221 – 10.1.73.22210.1.73.223
12110.1.73.224/3010.1.73.225 – 10.1.73.22610.1.73.227
12210.1.73.228/3010.1.73.229 – 10.1.73.23010.1.73.231
12310.1.73.232/3010.1.73.233 – 10.1.73.23410.1.73.235
12410.1.73.236/3010.1.73.237 – 10.1.73.23810.1.73.239
12510.1.73.240/3010.1.73.241 – 10.1.73.24210.1.73.243
12610.1.73.244/3010.1.73.245 – 10.1.73.24610.1.73.247
12710.1.73.248/3010.1.73.249 – 10.1.73.25010.1.73.251
12810.1.73.252/3010.1.73.253 – 10.1.73.25410.1.73.255
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 →