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)10.40.166.0/23
network10.40.166.0/23
broadcast10.40.167.255
first host10.40.166.1
last host10.40.167.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.40.166.0/23
address00001010.00101000.10100110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00101000.10100110.00000000
broadcast00001010.00101000.10100111.11111111
green = network part, grey = host part
hex0x0a28a600
decimal170436096
reverse dns0.166.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:a600

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.40.166.0/3010.40.166.1 – 10.40.166.210.40.166.3
210.40.166.4/3010.40.166.5 – 10.40.166.610.40.166.7
310.40.166.8/3010.40.166.9 – 10.40.166.1010.40.166.11
410.40.166.12/3010.40.166.13 – 10.40.166.1410.40.166.15
510.40.166.16/3010.40.166.17 – 10.40.166.1810.40.166.19
610.40.166.20/3010.40.166.21 – 10.40.166.2210.40.166.23
710.40.166.24/3010.40.166.25 – 10.40.166.2610.40.166.27
810.40.166.28/3010.40.166.29 – 10.40.166.3010.40.166.31
910.40.166.32/3010.40.166.33 – 10.40.166.3410.40.166.35
1010.40.166.36/3010.40.166.37 – 10.40.166.3810.40.166.39
1110.40.166.40/3010.40.166.41 – 10.40.166.4210.40.166.43
1210.40.166.44/3010.40.166.45 – 10.40.166.4610.40.166.47
1310.40.166.48/3010.40.166.49 – 10.40.166.5010.40.166.51
1410.40.166.52/3010.40.166.53 – 10.40.166.5410.40.166.55
1510.40.166.56/3010.40.166.57 – 10.40.166.5810.40.166.59
1610.40.166.60/3010.40.166.61 – 10.40.166.6210.40.166.63
1710.40.166.64/3010.40.166.65 – 10.40.166.6610.40.166.67
1810.40.166.68/3010.40.166.69 – 10.40.166.7010.40.166.71
1910.40.166.72/3010.40.166.73 – 10.40.166.7410.40.166.75
2010.40.166.76/3010.40.166.77 – 10.40.166.7810.40.166.79
2110.40.166.80/3010.40.166.81 – 10.40.166.8210.40.166.83
2210.40.166.84/3010.40.166.85 – 10.40.166.8610.40.166.87
2310.40.166.88/3010.40.166.89 – 10.40.166.9010.40.166.91
2410.40.166.92/3010.40.166.93 – 10.40.166.9410.40.166.95
2510.40.166.96/3010.40.166.97 – 10.40.166.9810.40.166.99
2610.40.166.100/3010.40.166.101 – 10.40.166.10210.40.166.103
2710.40.166.104/3010.40.166.105 – 10.40.166.10610.40.166.107
2810.40.166.108/3010.40.166.109 – 10.40.166.11010.40.166.111
2910.40.166.112/3010.40.166.113 – 10.40.166.11410.40.166.115
3010.40.166.116/3010.40.166.117 – 10.40.166.11810.40.166.119
3110.40.166.120/3010.40.166.121 – 10.40.166.12210.40.166.123
3210.40.166.124/3010.40.166.125 – 10.40.166.12610.40.166.127
3310.40.166.128/3010.40.166.129 – 10.40.166.13010.40.166.131
3410.40.166.132/3010.40.166.133 – 10.40.166.13410.40.166.135
3510.40.166.136/3010.40.166.137 – 10.40.166.13810.40.166.139
3610.40.166.140/3010.40.166.141 – 10.40.166.14210.40.166.143
3710.40.166.144/3010.40.166.145 – 10.40.166.14610.40.166.147
3810.40.166.148/3010.40.166.149 – 10.40.166.15010.40.166.151
3910.40.166.152/3010.40.166.153 – 10.40.166.15410.40.166.155
4010.40.166.156/3010.40.166.157 – 10.40.166.15810.40.166.159
4110.40.166.160/3010.40.166.161 – 10.40.166.16210.40.166.163
4210.40.166.164/3010.40.166.165 – 10.40.166.16610.40.166.167
4310.40.166.168/3010.40.166.169 – 10.40.166.17010.40.166.171
4410.40.166.172/3010.40.166.173 – 10.40.166.17410.40.166.175
4510.40.166.176/3010.40.166.177 – 10.40.166.17810.40.166.179
4610.40.166.180/3010.40.166.181 – 10.40.166.18210.40.166.183
4710.40.166.184/3010.40.166.185 – 10.40.166.18610.40.166.187
4810.40.166.188/3010.40.166.189 – 10.40.166.19010.40.166.191
4910.40.166.192/3010.40.166.193 – 10.40.166.19410.40.166.195
5010.40.166.196/3010.40.166.197 – 10.40.166.19810.40.166.199
5110.40.166.200/3010.40.166.201 – 10.40.166.20210.40.166.203
5210.40.166.204/3010.40.166.205 – 10.40.166.20610.40.166.207
5310.40.166.208/3010.40.166.209 – 10.40.166.21010.40.166.211
5410.40.166.212/3010.40.166.213 – 10.40.166.21410.40.166.215
5510.40.166.216/3010.40.166.217 – 10.40.166.21810.40.166.219
5610.40.166.220/3010.40.166.221 – 10.40.166.22210.40.166.223
5710.40.166.224/3010.40.166.225 – 10.40.166.22610.40.166.227
5810.40.166.228/3010.40.166.229 – 10.40.166.23010.40.166.231
5910.40.166.232/3010.40.166.233 – 10.40.166.23410.40.166.235
6010.40.166.236/3010.40.166.237 – 10.40.166.23810.40.166.239
6110.40.166.240/3010.40.166.241 – 10.40.166.24210.40.166.243
6210.40.166.244/3010.40.166.245 – 10.40.166.24610.40.166.247
6310.40.166.248/3010.40.166.249 – 10.40.166.25010.40.166.251
6410.40.166.252/3010.40.166.253 – 10.40.166.25410.40.166.255
6510.40.167.0/3010.40.167.1 – 10.40.167.210.40.167.3
6610.40.167.4/3010.40.167.5 – 10.40.167.610.40.167.7
6710.40.167.8/3010.40.167.9 – 10.40.167.1010.40.167.11
6810.40.167.12/3010.40.167.13 – 10.40.167.1410.40.167.15
6910.40.167.16/3010.40.167.17 – 10.40.167.1810.40.167.19
7010.40.167.20/3010.40.167.21 – 10.40.167.2210.40.167.23
7110.40.167.24/3010.40.167.25 – 10.40.167.2610.40.167.27
7210.40.167.28/3010.40.167.29 – 10.40.167.3010.40.167.31
7310.40.167.32/3010.40.167.33 – 10.40.167.3410.40.167.35
7410.40.167.36/3010.40.167.37 – 10.40.167.3810.40.167.39
7510.40.167.40/3010.40.167.41 – 10.40.167.4210.40.167.43
7610.40.167.44/3010.40.167.45 – 10.40.167.4610.40.167.47
7710.40.167.48/3010.40.167.49 – 10.40.167.5010.40.167.51
7810.40.167.52/3010.40.167.53 – 10.40.167.5410.40.167.55
7910.40.167.56/3010.40.167.57 – 10.40.167.5810.40.167.59
8010.40.167.60/3010.40.167.61 – 10.40.167.6210.40.167.63
8110.40.167.64/3010.40.167.65 – 10.40.167.6610.40.167.67
8210.40.167.68/3010.40.167.69 – 10.40.167.7010.40.167.71
8310.40.167.72/3010.40.167.73 – 10.40.167.7410.40.167.75
8410.40.167.76/3010.40.167.77 – 10.40.167.7810.40.167.79
8510.40.167.80/3010.40.167.81 – 10.40.167.8210.40.167.83
8610.40.167.84/3010.40.167.85 – 10.40.167.8610.40.167.87
8710.40.167.88/3010.40.167.89 – 10.40.167.9010.40.167.91
8810.40.167.92/3010.40.167.93 – 10.40.167.9410.40.167.95
8910.40.167.96/3010.40.167.97 – 10.40.167.9810.40.167.99
9010.40.167.100/3010.40.167.101 – 10.40.167.10210.40.167.103
9110.40.167.104/3010.40.167.105 – 10.40.167.10610.40.167.107
9210.40.167.108/3010.40.167.109 – 10.40.167.11010.40.167.111
9310.40.167.112/3010.40.167.113 – 10.40.167.11410.40.167.115
9410.40.167.116/3010.40.167.117 – 10.40.167.11810.40.167.119
9510.40.167.120/3010.40.167.121 – 10.40.167.12210.40.167.123
9610.40.167.124/3010.40.167.125 – 10.40.167.12610.40.167.127
9710.40.167.128/3010.40.167.129 – 10.40.167.13010.40.167.131
9810.40.167.132/3010.40.167.133 – 10.40.167.13410.40.167.135
9910.40.167.136/3010.40.167.137 – 10.40.167.13810.40.167.139
10010.40.167.140/3010.40.167.141 – 10.40.167.14210.40.167.143
10110.40.167.144/3010.40.167.145 – 10.40.167.14610.40.167.147
10210.40.167.148/3010.40.167.149 – 10.40.167.15010.40.167.151
10310.40.167.152/3010.40.167.153 – 10.40.167.15410.40.167.155
10410.40.167.156/3010.40.167.157 – 10.40.167.15810.40.167.159
10510.40.167.160/3010.40.167.161 – 10.40.167.16210.40.167.163
10610.40.167.164/3010.40.167.165 – 10.40.167.16610.40.167.167
10710.40.167.168/3010.40.167.169 – 10.40.167.17010.40.167.171
10810.40.167.172/3010.40.167.173 – 10.40.167.17410.40.167.175
10910.40.167.176/3010.40.167.177 – 10.40.167.17810.40.167.179
11010.40.167.180/3010.40.167.181 – 10.40.167.18210.40.167.183
11110.40.167.184/3010.40.167.185 – 10.40.167.18610.40.167.187
11210.40.167.188/3010.40.167.189 – 10.40.167.19010.40.167.191
11310.40.167.192/3010.40.167.193 – 10.40.167.19410.40.167.195
11410.40.167.196/3010.40.167.197 – 10.40.167.19810.40.167.199
11510.40.167.200/3010.40.167.201 – 10.40.167.20210.40.167.203
11610.40.167.204/3010.40.167.205 – 10.40.167.20610.40.167.207
11710.40.167.208/3010.40.167.209 – 10.40.167.21010.40.167.211
11810.40.167.212/3010.40.167.213 – 10.40.167.21410.40.167.215
11910.40.167.216/3010.40.167.217 – 10.40.167.21810.40.167.219
12010.40.167.220/3010.40.167.221 – 10.40.167.22210.40.167.223
12110.40.167.224/3010.40.167.225 – 10.40.167.22610.40.167.227
12210.40.167.228/3010.40.167.229 – 10.40.167.23010.40.167.231
12310.40.167.232/3010.40.167.233 – 10.40.167.23410.40.167.235
12410.40.167.236/3010.40.167.237 – 10.40.167.23810.40.167.239
12510.40.167.240/3010.40.167.241 – 10.40.167.24210.40.167.243
12610.40.167.244/3010.40.167.245 – 10.40.167.24610.40.167.247
12710.40.167.248/3010.40.167.249 – 10.40.167.25010.40.167.251
12810.40.167.252/3010.40.167.253 – 10.40.167.25410.40.167.255
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 →