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)10.40.2.0/23
network10.40.2.0/23
broadcast10.40.3.255
first host10.40.2.1
last host10.40.3.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.40.2.0/23
address00001010.00101000.00000010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00101000.00000010.00000000
broadcast00001010.00101000.00000011.11111111
green = network part, grey = host part
hex0x0a280200
decimal170394112
reverse dns0.2.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:200

/23 split into /30 · 128 subnets

close ×
#networkhost rangebroadcast
110.40.2.0/3010.40.2.1 – 10.40.2.210.40.2.3
210.40.2.4/3010.40.2.5 – 10.40.2.610.40.2.7
310.40.2.8/3010.40.2.9 – 10.40.2.1010.40.2.11
410.40.2.12/3010.40.2.13 – 10.40.2.1410.40.2.15
510.40.2.16/3010.40.2.17 – 10.40.2.1810.40.2.19
610.40.2.20/3010.40.2.21 – 10.40.2.2210.40.2.23
710.40.2.24/3010.40.2.25 – 10.40.2.2610.40.2.27
810.40.2.28/3010.40.2.29 – 10.40.2.3010.40.2.31
910.40.2.32/3010.40.2.33 – 10.40.2.3410.40.2.35
1010.40.2.36/3010.40.2.37 – 10.40.2.3810.40.2.39
1110.40.2.40/3010.40.2.41 – 10.40.2.4210.40.2.43
1210.40.2.44/3010.40.2.45 – 10.40.2.4610.40.2.47
1310.40.2.48/3010.40.2.49 – 10.40.2.5010.40.2.51
1410.40.2.52/3010.40.2.53 – 10.40.2.5410.40.2.55
1510.40.2.56/3010.40.2.57 – 10.40.2.5810.40.2.59
1610.40.2.60/3010.40.2.61 – 10.40.2.6210.40.2.63
1710.40.2.64/3010.40.2.65 – 10.40.2.6610.40.2.67
1810.40.2.68/3010.40.2.69 – 10.40.2.7010.40.2.71
1910.40.2.72/3010.40.2.73 – 10.40.2.7410.40.2.75
2010.40.2.76/3010.40.2.77 – 10.40.2.7810.40.2.79
2110.40.2.80/3010.40.2.81 – 10.40.2.8210.40.2.83
2210.40.2.84/3010.40.2.85 – 10.40.2.8610.40.2.87
2310.40.2.88/3010.40.2.89 – 10.40.2.9010.40.2.91
2410.40.2.92/3010.40.2.93 – 10.40.2.9410.40.2.95
2510.40.2.96/3010.40.2.97 – 10.40.2.9810.40.2.99
2610.40.2.100/3010.40.2.101 – 10.40.2.10210.40.2.103
2710.40.2.104/3010.40.2.105 – 10.40.2.10610.40.2.107
2810.40.2.108/3010.40.2.109 – 10.40.2.11010.40.2.111
2910.40.2.112/3010.40.2.113 – 10.40.2.11410.40.2.115
3010.40.2.116/3010.40.2.117 – 10.40.2.11810.40.2.119
3110.40.2.120/3010.40.2.121 – 10.40.2.12210.40.2.123
3210.40.2.124/3010.40.2.125 – 10.40.2.12610.40.2.127
3310.40.2.128/3010.40.2.129 – 10.40.2.13010.40.2.131
3410.40.2.132/3010.40.2.133 – 10.40.2.13410.40.2.135
3510.40.2.136/3010.40.2.137 – 10.40.2.13810.40.2.139
3610.40.2.140/3010.40.2.141 – 10.40.2.14210.40.2.143
3710.40.2.144/3010.40.2.145 – 10.40.2.14610.40.2.147
3810.40.2.148/3010.40.2.149 – 10.40.2.15010.40.2.151
3910.40.2.152/3010.40.2.153 – 10.40.2.15410.40.2.155
4010.40.2.156/3010.40.2.157 – 10.40.2.15810.40.2.159
4110.40.2.160/3010.40.2.161 – 10.40.2.16210.40.2.163
4210.40.2.164/3010.40.2.165 – 10.40.2.16610.40.2.167
4310.40.2.168/3010.40.2.169 – 10.40.2.17010.40.2.171
4410.40.2.172/3010.40.2.173 – 10.40.2.17410.40.2.175
4510.40.2.176/3010.40.2.177 – 10.40.2.17810.40.2.179
4610.40.2.180/3010.40.2.181 – 10.40.2.18210.40.2.183
4710.40.2.184/3010.40.2.185 – 10.40.2.18610.40.2.187
4810.40.2.188/3010.40.2.189 – 10.40.2.19010.40.2.191
4910.40.2.192/3010.40.2.193 – 10.40.2.19410.40.2.195
5010.40.2.196/3010.40.2.197 – 10.40.2.19810.40.2.199
5110.40.2.200/3010.40.2.201 – 10.40.2.20210.40.2.203
5210.40.2.204/3010.40.2.205 – 10.40.2.20610.40.2.207
5310.40.2.208/3010.40.2.209 – 10.40.2.21010.40.2.211
5410.40.2.212/3010.40.2.213 – 10.40.2.21410.40.2.215
5510.40.2.216/3010.40.2.217 – 10.40.2.21810.40.2.219
5610.40.2.220/3010.40.2.221 – 10.40.2.22210.40.2.223
5710.40.2.224/3010.40.2.225 – 10.40.2.22610.40.2.227
5810.40.2.228/3010.40.2.229 – 10.40.2.23010.40.2.231
5910.40.2.232/3010.40.2.233 – 10.40.2.23410.40.2.235
6010.40.2.236/3010.40.2.237 – 10.40.2.23810.40.2.239
6110.40.2.240/3010.40.2.241 – 10.40.2.24210.40.2.243
6210.40.2.244/3010.40.2.245 – 10.40.2.24610.40.2.247
6310.40.2.248/3010.40.2.249 – 10.40.2.25010.40.2.251
6410.40.2.252/3010.40.2.253 – 10.40.2.25410.40.2.255
6510.40.3.0/3010.40.3.1 – 10.40.3.210.40.3.3
6610.40.3.4/3010.40.3.5 – 10.40.3.610.40.3.7
6710.40.3.8/3010.40.3.9 – 10.40.3.1010.40.3.11
6810.40.3.12/3010.40.3.13 – 10.40.3.1410.40.3.15
6910.40.3.16/3010.40.3.17 – 10.40.3.1810.40.3.19
7010.40.3.20/3010.40.3.21 – 10.40.3.2210.40.3.23
7110.40.3.24/3010.40.3.25 – 10.40.3.2610.40.3.27
7210.40.3.28/3010.40.3.29 – 10.40.3.3010.40.3.31
7310.40.3.32/3010.40.3.33 – 10.40.3.3410.40.3.35
7410.40.3.36/3010.40.3.37 – 10.40.3.3810.40.3.39
7510.40.3.40/3010.40.3.41 – 10.40.3.4210.40.3.43
7610.40.3.44/3010.40.3.45 – 10.40.3.4610.40.3.47
7710.40.3.48/3010.40.3.49 – 10.40.3.5010.40.3.51
7810.40.3.52/3010.40.3.53 – 10.40.3.5410.40.3.55
7910.40.3.56/3010.40.3.57 – 10.40.3.5810.40.3.59
8010.40.3.60/3010.40.3.61 – 10.40.3.6210.40.3.63
8110.40.3.64/3010.40.3.65 – 10.40.3.6610.40.3.67
8210.40.3.68/3010.40.3.69 – 10.40.3.7010.40.3.71
8310.40.3.72/3010.40.3.73 – 10.40.3.7410.40.3.75
8410.40.3.76/3010.40.3.77 – 10.40.3.7810.40.3.79
8510.40.3.80/3010.40.3.81 – 10.40.3.8210.40.3.83
8610.40.3.84/3010.40.3.85 – 10.40.3.8610.40.3.87
8710.40.3.88/3010.40.3.89 – 10.40.3.9010.40.3.91
8810.40.3.92/3010.40.3.93 – 10.40.3.9410.40.3.95
8910.40.3.96/3010.40.3.97 – 10.40.3.9810.40.3.99
9010.40.3.100/3010.40.3.101 – 10.40.3.10210.40.3.103
9110.40.3.104/3010.40.3.105 – 10.40.3.10610.40.3.107
9210.40.3.108/3010.40.3.109 – 10.40.3.11010.40.3.111
9310.40.3.112/3010.40.3.113 – 10.40.3.11410.40.3.115
9410.40.3.116/3010.40.3.117 – 10.40.3.11810.40.3.119
9510.40.3.120/3010.40.3.121 – 10.40.3.12210.40.3.123
9610.40.3.124/3010.40.3.125 – 10.40.3.12610.40.3.127
9710.40.3.128/3010.40.3.129 – 10.40.3.13010.40.3.131
9810.40.3.132/3010.40.3.133 – 10.40.3.13410.40.3.135
9910.40.3.136/3010.40.3.137 – 10.40.3.13810.40.3.139
10010.40.3.140/3010.40.3.141 – 10.40.3.14210.40.3.143
10110.40.3.144/3010.40.3.145 – 10.40.3.14610.40.3.147
10210.40.3.148/3010.40.3.149 – 10.40.3.15010.40.3.151
10310.40.3.152/3010.40.3.153 – 10.40.3.15410.40.3.155
10410.40.3.156/3010.40.3.157 – 10.40.3.15810.40.3.159
10510.40.3.160/3010.40.3.161 – 10.40.3.16210.40.3.163
10610.40.3.164/3010.40.3.165 – 10.40.3.16610.40.3.167
10710.40.3.168/3010.40.3.169 – 10.40.3.17010.40.3.171
10810.40.3.172/3010.40.3.173 – 10.40.3.17410.40.3.175
10910.40.3.176/3010.40.3.177 – 10.40.3.17810.40.3.179
11010.40.3.180/3010.40.3.181 – 10.40.3.18210.40.3.183
11110.40.3.184/3010.40.3.185 – 10.40.3.18610.40.3.187
11210.40.3.188/3010.40.3.189 – 10.40.3.19010.40.3.191
11310.40.3.192/3010.40.3.193 – 10.40.3.19410.40.3.195
11410.40.3.196/3010.40.3.197 – 10.40.3.19810.40.3.199
11510.40.3.200/3010.40.3.201 – 10.40.3.20210.40.3.203
11610.40.3.204/3010.40.3.205 – 10.40.3.20610.40.3.207
11710.40.3.208/3010.40.3.209 – 10.40.3.21010.40.3.211
11810.40.3.212/3010.40.3.213 – 10.40.3.21410.40.3.215
11910.40.3.216/3010.40.3.217 – 10.40.3.21810.40.3.219
12010.40.3.220/3010.40.3.221 – 10.40.3.22210.40.3.223
12110.40.3.224/3010.40.3.225 – 10.40.3.22610.40.3.227
12210.40.3.228/3010.40.3.229 – 10.40.3.23010.40.3.231
12310.40.3.232/3010.40.3.233 – 10.40.3.23410.40.3.235
12410.40.3.236/3010.40.3.237 – 10.40.3.23810.40.3.239
12510.40.3.240/3010.40.3.241 – 10.40.3.24210.40.3.243
12610.40.3.244/3010.40.3.245 – 10.40.3.24610.40.3.247
12710.40.3.248/3010.40.3.249 – 10.40.3.25010.40.3.251
12810.40.3.252/3010.40.3.253 – 10.40.3.25410.40.3.255
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 →