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)10.18.40.0/22
network10.18.40.0/22
broadcast10.18.43.255
first host10.18.40.1
last host10.18.43.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.18.40.0/22
address00001010.00010010.00101000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00010010.00101000.00000000
broadcast00001010.00010010.00101011.11111111
green = network part, grey = host part
hex0x0a122800
decimal168962048
reverse dns0.40.18.10.in-addr.arpa
ipv4-mapped::ffff:a12:2800

/22 split into /29 · 128 subnets

close ×
#networkhost rangebroadcast
110.18.40.0/2910.18.40.1 – 10.18.40.610.18.40.7
210.18.40.8/2910.18.40.9 – 10.18.40.1410.18.40.15
310.18.40.16/2910.18.40.17 – 10.18.40.2210.18.40.23
410.18.40.24/2910.18.40.25 – 10.18.40.3010.18.40.31
510.18.40.32/2910.18.40.33 – 10.18.40.3810.18.40.39
610.18.40.40/2910.18.40.41 – 10.18.40.4610.18.40.47
710.18.40.48/2910.18.40.49 – 10.18.40.5410.18.40.55
810.18.40.56/2910.18.40.57 – 10.18.40.6210.18.40.63
910.18.40.64/2910.18.40.65 – 10.18.40.7010.18.40.71
1010.18.40.72/2910.18.40.73 – 10.18.40.7810.18.40.79
1110.18.40.80/2910.18.40.81 – 10.18.40.8610.18.40.87
1210.18.40.88/2910.18.40.89 – 10.18.40.9410.18.40.95
1310.18.40.96/2910.18.40.97 – 10.18.40.10210.18.40.103
1410.18.40.104/2910.18.40.105 – 10.18.40.11010.18.40.111
1510.18.40.112/2910.18.40.113 – 10.18.40.11810.18.40.119
1610.18.40.120/2910.18.40.121 – 10.18.40.12610.18.40.127
1710.18.40.128/2910.18.40.129 – 10.18.40.13410.18.40.135
1810.18.40.136/2910.18.40.137 – 10.18.40.14210.18.40.143
1910.18.40.144/2910.18.40.145 – 10.18.40.15010.18.40.151
2010.18.40.152/2910.18.40.153 – 10.18.40.15810.18.40.159
2110.18.40.160/2910.18.40.161 – 10.18.40.16610.18.40.167
2210.18.40.168/2910.18.40.169 – 10.18.40.17410.18.40.175
2310.18.40.176/2910.18.40.177 – 10.18.40.18210.18.40.183
2410.18.40.184/2910.18.40.185 – 10.18.40.19010.18.40.191
2510.18.40.192/2910.18.40.193 – 10.18.40.19810.18.40.199
2610.18.40.200/2910.18.40.201 – 10.18.40.20610.18.40.207
2710.18.40.208/2910.18.40.209 – 10.18.40.21410.18.40.215
2810.18.40.216/2910.18.40.217 – 10.18.40.22210.18.40.223
2910.18.40.224/2910.18.40.225 – 10.18.40.23010.18.40.231
3010.18.40.232/2910.18.40.233 – 10.18.40.23810.18.40.239
3110.18.40.240/2910.18.40.241 – 10.18.40.24610.18.40.247
3210.18.40.248/2910.18.40.249 – 10.18.40.25410.18.40.255
3310.18.41.0/2910.18.41.1 – 10.18.41.610.18.41.7
3410.18.41.8/2910.18.41.9 – 10.18.41.1410.18.41.15
3510.18.41.16/2910.18.41.17 – 10.18.41.2210.18.41.23
3610.18.41.24/2910.18.41.25 – 10.18.41.3010.18.41.31
3710.18.41.32/2910.18.41.33 – 10.18.41.3810.18.41.39
3810.18.41.40/2910.18.41.41 – 10.18.41.4610.18.41.47
3910.18.41.48/2910.18.41.49 – 10.18.41.5410.18.41.55
4010.18.41.56/2910.18.41.57 – 10.18.41.6210.18.41.63
4110.18.41.64/2910.18.41.65 – 10.18.41.7010.18.41.71
4210.18.41.72/2910.18.41.73 – 10.18.41.7810.18.41.79
4310.18.41.80/2910.18.41.81 – 10.18.41.8610.18.41.87
4410.18.41.88/2910.18.41.89 – 10.18.41.9410.18.41.95
4510.18.41.96/2910.18.41.97 – 10.18.41.10210.18.41.103
4610.18.41.104/2910.18.41.105 – 10.18.41.11010.18.41.111
4710.18.41.112/2910.18.41.113 – 10.18.41.11810.18.41.119
4810.18.41.120/2910.18.41.121 – 10.18.41.12610.18.41.127
4910.18.41.128/2910.18.41.129 – 10.18.41.13410.18.41.135
5010.18.41.136/2910.18.41.137 – 10.18.41.14210.18.41.143
5110.18.41.144/2910.18.41.145 – 10.18.41.15010.18.41.151
5210.18.41.152/2910.18.41.153 – 10.18.41.15810.18.41.159
5310.18.41.160/2910.18.41.161 – 10.18.41.16610.18.41.167
5410.18.41.168/2910.18.41.169 – 10.18.41.17410.18.41.175
5510.18.41.176/2910.18.41.177 – 10.18.41.18210.18.41.183
5610.18.41.184/2910.18.41.185 – 10.18.41.19010.18.41.191
5710.18.41.192/2910.18.41.193 – 10.18.41.19810.18.41.199
5810.18.41.200/2910.18.41.201 – 10.18.41.20610.18.41.207
5910.18.41.208/2910.18.41.209 – 10.18.41.21410.18.41.215
6010.18.41.216/2910.18.41.217 – 10.18.41.22210.18.41.223
6110.18.41.224/2910.18.41.225 – 10.18.41.23010.18.41.231
6210.18.41.232/2910.18.41.233 – 10.18.41.23810.18.41.239
6310.18.41.240/2910.18.41.241 – 10.18.41.24610.18.41.247
6410.18.41.248/2910.18.41.249 – 10.18.41.25410.18.41.255
6510.18.42.0/2910.18.42.1 – 10.18.42.610.18.42.7
6610.18.42.8/2910.18.42.9 – 10.18.42.1410.18.42.15
6710.18.42.16/2910.18.42.17 – 10.18.42.2210.18.42.23
6810.18.42.24/2910.18.42.25 – 10.18.42.3010.18.42.31
6910.18.42.32/2910.18.42.33 – 10.18.42.3810.18.42.39
7010.18.42.40/2910.18.42.41 – 10.18.42.4610.18.42.47
7110.18.42.48/2910.18.42.49 – 10.18.42.5410.18.42.55
7210.18.42.56/2910.18.42.57 – 10.18.42.6210.18.42.63
7310.18.42.64/2910.18.42.65 – 10.18.42.7010.18.42.71
7410.18.42.72/2910.18.42.73 – 10.18.42.7810.18.42.79
7510.18.42.80/2910.18.42.81 – 10.18.42.8610.18.42.87
7610.18.42.88/2910.18.42.89 – 10.18.42.9410.18.42.95
7710.18.42.96/2910.18.42.97 – 10.18.42.10210.18.42.103
7810.18.42.104/2910.18.42.105 – 10.18.42.11010.18.42.111
7910.18.42.112/2910.18.42.113 – 10.18.42.11810.18.42.119
8010.18.42.120/2910.18.42.121 – 10.18.42.12610.18.42.127
8110.18.42.128/2910.18.42.129 – 10.18.42.13410.18.42.135
8210.18.42.136/2910.18.42.137 – 10.18.42.14210.18.42.143
8310.18.42.144/2910.18.42.145 – 10.18.42.15010.18.42.151
8410.18.42.152/2910.18.42.153 – 10.18.42.15810.18.42.159
8510.18.42.160/2910.18.42.161 – 10.18.42.16610.18.42.167
8610.18.42.168/2910.18.42.169 – 10.18.42.17410.18.42.175
8710.18.42.176/2910.18.42.177 – 10.18.42.18210.18.42.183
8810.18.42.184/2910.18.42.185 – 10.18.42.19010.18.42.191
8910.18.42.192/2910.18.42.193 – 10.18.42.19810.18.42.199
9010.18.42.200/2910.18.42.201 – 10.18.42.20610.18.42.207
9110.18.42.208/2910.18.42.209 – 10.18.42.21410.18.42.215
9210.18.42.216/2910.18.42.217 – 10.18.42.22210.18.42.223
9310.18.42.224/2910.18.42.225 – 10.18.42.23010.18.42.231
9410.18.42.232/2910.18.42.233 – 10.18.42.23810.18.42.239
9510.18.42.240/2910.18.42.241 – 10.18.42.24610.18.42.247
9610.18.42.248/2910.18.42.249 – 10.18.42.25410.18.42.255
9710.18.43.0/2910.18.43.1 – 10.18.43.610.18.43.7
9810.18.43.8/2910.18.43.9 – 10.18.43.1410.18.43.15
9910.18.43.16/2910.18.43.17 – 10.18.43.2210.18.43.23
10010.18.43.24/2910.18.43.25 – 10.18.43.3010.18.43.31
10110.18.43.32/2910.18.43.33 – 10.18.43.3810.18.43.39
10210.18.43.40/2910.18.43.41 – 10.18.43.4610.18.43.47
10310.18.43.48/2910.18.43.49 – 10.18.43.5410.18.43.55
10410.18.43.56/2910.18.43.57 – 10.18.43.6210.18.43.63
10510.18.43.64/2910.18.43.65 – 10.18.43.7010.18.43.71
10610.18.43.72/2910.18.43.73 – 10.18.43.7810.18.43.79
10710.18.43.80/2910.18.43.81 – 10.18.43.8610.18.43.87
10810.18.43.88/2910.18.43.89 – 10.18.43.9410.18.43.95
10910.18.43.96/2910.18.43.97 – 10.18.43.10210.18.43.103
11010.18.43.104/2910.18.43.105 – 10.18.43.11010.18.43.111
11110.18.43.112/2910.18.43.113 – 10.18.43.11810.18.43.119
11210.18.43.120/2910.18.43.121 – 10.18.43.12610.18.43.127
11310.18.43.128/2910.18.43.129 – 10.18.43.13410.18.43.135
11410.18.43.136/2910.18.43.137 – 10.18.43.14210.18.43.143
11510.18.43.144/2910.18.43.145 – 10.18.43.15010.18.43.151
11610.18.43.152/2910.18.43.153 – 10.18.43.15810.18.43.159
11710.18.43.160/2910.18.43.161 – 10.18.43.16610.18.43.167
11810.18.43.168/2910.18.43.169 – 10.18.43.17410.18.43.175
11910.18.43.176/2910.18.43.177 – 10.18.43.18210.18.43.183
12010.18.43.184/2910.18.43.185 – 10.18.43.19010.18.43.191
12110.18.43.192/2910.18.43.193 – 10.18.43.19810.18.43.199
12210.18.43.200/2910.18.43.201 – 10.18.43.20610.18.43.207
12310.18.43.208/2910.18.43.209 – 10.18.43.21410.18.43.215
12410.18.43.216/2910.18.43.217 – 10.18.43.22210.18.43.223
12510.18.43.224/2910.18.43.225 – 10.18.43.23010.18.43.231
12610.18.43.232/2910.18.43.233 – 10.18.43.23810.18.43.239
12710.18.43.240/2910.18.43.241 – 10.18.43.24610.18.43.247
12810.18.43.248/2910.18.43.249 – 10.18.43.25410.18.43.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /22
/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-
/22255.255.252.01,0241,0221
/23255.255.254.05125102 split →
/24255.255.255.02562544 split →
/25255.255.255.1281281268 split →
/26255.255.255.192646216 split →
/27255.255.255.224323032 split →
/28255.255.255.240161464 split →
/29255.255.255.24886128 split →
/30255.255.255.25242256 split →
/31255.255.255.25422512 split →
/32255.255.255.255111,024 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 →