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)10.232.80.0/21
network10.232.80.0/21
broadcast10.232.87.255
first host10.232.80.1
last host10.232.87.254
subnet mask255.255.248.0
wildcard0.0.7.255
addresses2,048
usable hosts2,046
classA
ipcalc 10.232.80.0/21
address00001010.11101000.01010000.00000000
subnet mask11111111.11111111.11111000.00000000
network00001010.11101000.01010000.00000000
broadcast00001010.11101000.01010111.11111111
green = network part, grey = host part
hex0x0ae85000
decimal182996992
reverse dns0.80.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:5000

/21 split into /28 · 128 subnets

close ×
#networkhost rangebroadcast
110.232.80.0/2810.232.80.1 – 10.232.80.1410.232.80.15
210.232.80.16/2810.232.80.17 – 10.232.80.3010.232.80.31
310.232.80.32/2810.232.80.33 – 10.232.80.4610.232.80.47
410.232.80.48/2810.232.80.49 – 10.232.80.6210.232.80.63
510.232.80.64/2810.232.80.65 – 10.232.80.7810.232.80.79
610.232.80.80/2810.232.80.81 – 10.232.80.9410.232.80.95
710.232.80.96/2810.232.80.97 – 10.232.80.11010.232.80.111
810.232.80.112/2810.232.80.113 – 10.232.80.12610.232.80.127
910.232.80.128/2810.232.80.129 – 10.232.80.14210.232.80.143
1010.232.80.144/2810.232.80.145 – 10.232.80.15810.232.80.159
1110.232.80.160/2810.232.80.161 – 10.232.80.17410.232.80.175
1210.232.80.176/2810.232.80.177 – 10.232.80.19010.232.80.191
1310.232.80.192/2810.232.80.193 – 10.232.80.20610.232.80.207
1410.232.80.208/2810.232.80.209 – 10.232.80.22210.232.80.223
1510.232.80.224/2810.232.80.225 – 10.232.80.23810.232.80.239
1610.232.80.240/2810.232.80.241 – 10.232.80.25410.232.80.255
1710.232.81.0/2810.232.81.1 – 10.232.81.1410.232.81.15
1810.232.81.16/2810.232.81.17 – 10.232.81.3010.232.81.31
1910.232.81.32/2810.232.81.33 – 10.232.81.4610.232.81.47
2010.232.81.48/2810.232.81.49 – 10.232.81.6210.232.81.63
2110.232.81.64/2810.232.81.65 – 10.232.81.7810.232.81.79
2210.232.81.80/2810.232.81.81 – 10.232.81.9410.232.81.95
2310.232.81.96/2810.232.81.97 – 10.232.81.11010.232.81.111
2410.232.81.112/2810.232.81.113 – 10.232.81.12610.232.81.127
2510.232.81.128/2810.232.81.129 – 10.232.81.14210.232.81.143
2610.232.81.144/2810.232.81.145 – 10.232.81.15810.232.81.159
2710.232.81.160/2810.232.81.161 – 10.232.81.17410.232.81.175
2810.232.81.176/2810.232.81.177 – 10.232.81.19010.232.81.191
2910.232.81.192/2810.232.81.193 – 10.232.81.20610.232.81.207
3010.232.81.208/2810.232.81.209 – 10.232.81.22210.232.81.223
3110.232.81.224/2810.232.81.225 – 10.232.81.23810.232.81.239
3210.232.81.240/2810.232.81.241 – 10.232.81.25410.232.81.255
3310.232.82.0/2810.232.82.1 – 10.232.82.1410.232.82.15
3410.232.82.16/2810.232.82.17 – 10.232.82.3010.232.82.31
3510.232.82.32/2810.232.82.33 – 10.232.82.4610.232.82.47
3610.232.82.48/2810.232.82.49 – 10.232.82.6210.232.82.63
3710.232.82.64/2810.232.82.65 – 10.232.82.7810.232.82.79
3810.232.82.80/2810.232.82.81 – 10.232.82.9410.232.82.95
3910.232.82.96/2810.232.82.97 – 10.232.82.11010.232.82.111
4010.232.82.112/2810.232.82.113 – 10.232.82.12610.232.82.127
4110.232.82.128/2810.232.82.129 – 10.232.82.14210.232.82.143
4210.232.82.144/2810.232.82.145 – 10.232.82.15810.232.82.159
4310.232.82.160/2810.232.82.161 – 10.232.82.17410.232.82.175
4410.232.82.176/2810.232.82.177 – 10.232.82.19010.232.82.191
4510.232.82.192/2810.232.82.193 – 10.232.82.20610.232.82.207
4610.232.82.208/2810.232.82.209 – 10.232.82.22210.232.82.223
4710.232.82.224/2810.232.82.225 – 10.232.82.23810.232.82.239
4810.232.82.240/2810.232.82.241 – 10.232.82.25410.232.82.255
4910.232.83.0/2810.232.83.1 – 10.232.83.1410.232.83.15
5010.232.83.16/2810.232.83.17 – 10.232.83.3010.232.83.31
5110.232.83.32/2810.232.83.33 – 10.232.83.4610.232.83.47
5210.232.83.48/2810.232.83.49 – 10.232.83.6210.232.83.63
5310.232.83.64/2810.232.83.65 – 10.232.83.7810.232.83.79
5410.232.83.80/2810.232.83.81 – 10.232.83.9410.232.83.95
5510.232.83.96/2810.232.83.97 – 10.232.83.11010.232.83.111
5610.232.83.112/2810.232.83.113 – 10.232.83.12610.232.83.127
5710.232.83.128/2810.232.83.129 – 10.232.83.14210.232.83.143
5810.232.83.144/2810.232.83.145 – 10.232.83.15810.232.83.159
5910.232.83.160/2810.232.83.161 – 10.232.83.17410.232.83.175
6010.232.83.176/2810.232.83.177 – 10.232.83.19010.232.83.191
6110.232.83.192/2810.232.83.193 – 10.232.83.20610.232.83.207
6210.232.83.208/2810.232.83.209 – 10.232.83.22210.232.83.223
6310.232.83.224/2810.232.83.225 – 10.232.83.23810.232.83.239
6410.232.83.240/2810.232.83.241 – 10.232.83.25410.232.83.255
6510.232.84.0/2810.232.84.1 – 10.232.84.1410.232.84.15
6610.232.84.16/2810.232.84.17 – 10.232.84.3010.232.84.31
6710.232.84.32/2810.232.84.33 – 10.232.84.4610.232.84.47
6810.232.84.48/2810.232.84.49 – 10.232.84.6210.232.84.63
6910.232.84.64/2810.232.84.65 – 10.232.84.7810.232.84.79
7010.232.84.80/2810.232.84.81 – 10.232.84.9410.232.84.95
7110.232.84.96/2810.232.84.97 – 10.232.84.11010.232.84.111
7210.232.84.112/2810.232.84.113 – 10.232.84.12610.232.84.127
7310.232.84.128/2810.232.84.129 – 10.232.84.14210.232.84.143
7410.232.84.144/2810.232.84.145 – 10.232.84.15810.232.84.159
7510.232.84.160/2810.232.84.161 – 10.232.84.17410.232.84.175
7610.232.84.176/2810.232.84.177 – 10.232.84.19010.232.84.191
7710.232.84.192/2810.232.84.193 – 10.232.84.20610.232.84.207
7810.232.84.208/2810.232.84.209 – 10.232.84.22210.232.84.223
7910.232.84.224/2810.232.84.225 – 10.232.84.23810.232.84.239
8010.232.84.240/2810.232.84.241 – 10.232.84.25410.232.84.255
8110.232.85.0/2810.232.85.1 – 10.232.85.1410.232.85.15
8210.232.85.16/2810.232.85.17 – 10.232.85.3010.232.85.31
8310.232.85.32/2810.232.85.33 – 10.232.85.4610.232.85.47
8410.232.85.48/2810.232.85.49 – 10.232.85.6210.232.85.63
8510.232.85.64/2810.232.85.65 – 10.232.85.7810.232.85.79
8610.232.85.80/2810.232.85.81 – 10.232.85.9410.232.85.95
8710.232.85.96/2810.232.85.97 – 10.232.85.11010.232.85.111
8810.232.85.112/2810.232.85.113 – 10.232.85.12610.232.85.127
8910.232.85.128/2810.232.85.129 – 10.232.85.14210.232.85.143
9010.232.85.144/2810.232.85.145 – 10.232.85.15810.232.85.159
9110.232.85.160/2810.232.85.161 – 10.232.85.17410.232.85.175
9210.232.85.176/2810.232.85.177 – 10.232.85.19010.232.85.191
9310.232.85.192/2810.232.85.193 – 10.232.85.20610.232.85.207
9410.232.85.208/2810.232.85.209 – 10.232.85.22210.232.85.223
9510.232.85.224/2810.232.85.225 – 10.232.85.23810.232.85.239
9610.232.85.240/2810.232.85.241 – 10.232.85.25410.232.85.255
9710.232.86.0/2810.232.86.1 – 10.232.86.1410.232.86.15
9810.232.86.16/2810.232.86.17 – 10.232.86.3010.232.86.31
9910.232.86.32/2810.232.86.33 – 10.232.86.4610.232.86.47
10010.232.86.48/2810.232.86.49 – 10.232.86.6210.232.86.63
10110.232.86.64/2810.232.86.65 – 10.232.86.7810.232.86.79
10210.232.86.80/2810.232.86.81 – 10.232.86.9410.232.86.95
10310.232.86.96/2810.232.86.97 – 10.232.86.11010.232.86.111
10410.232.86.112/2810.232.86.113 – 10.232.86.12610.232.86.127
10510.232.86.128/2810.232.86.129 – 10.232.86.14210.232.86.143
10610.232.86.144/2810.232.86.145 – 10.232.86.15810.232.86.159
10710.232.86.160/2810.232.86.161 – 10.232.86.17410.232.86.175
10810.232.86.176/2810.232.86.177 – 10.232.86.19010.232.86.191
10910.232.86.192/2810.232.86.193 – 10.232.86.20610.232.86.207
11010.232.86.208/2810.232.86.209 – 10.232.86.22210.232.86.223
11110.232.86.224/2810.232.86.225 – 10.232.86.23810.232.86.239
11210.232.86.240/2810.232.86.241 – 10.232.86.25410.232.86.255
11310.232.87.0/2810.232.87.1 – 10.232.87.1410.232.87.15
11410.232.87.16/2810.232.87.17 – 10.232.87.3010.232.87.31
11510.232.87.32/2810.232.87.33 – 10.232.87.4610.232.87.47
11610.232.87.48/2810.232.87.49 – 10.232.87.6210.232.87.63
11710.232.87.64/2810.232.87.65 – 10.232.87.7810.232.87.79
11810.232.87.80/2810.232.87.81 – 10.232.87.9410.232.87.95
11910.232.87.96/2810.232.87.97 – 10.232.87.11010.232.87.111
12010.232.87.112/2810.232.87.113 – 10.232.87.12610.232.87.127
12110.232.87.128/2810.232.87.129 – 10.232.87.14210.232.87.143
12210.232.87.144/2810.232.87.145 – 10.232.87.15810.232.87.159
12310.232.87.160/2810.232.87.161 – 10.232.87.17410.232.87.175
12410.232.87.176/2810.232.87.177 – 10.232.87.19010.232.87.191
12510.232.87.192/2810.232.87.193 – 10.232.87.20610.232.87.207
12610.232.87.208/2810.232.87.209 – 10.232.87.22210.232.87.223
12710.232.87.224/2810.232.87.225 – 10.232.87.23810.232.87.239
12810.232.87.240/2810.232.87.241 – 10.232.87.25410.232.87.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /21
/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-
/21255.255.248.02,0482,0461
/22255.255.252.01,0241,0222 split →
/23255.255.254.05125104 split →
/24255.255.255.02562548 split →
/25255.255.255.12812812616 split →
/26255.255.255.192646232 split →
/27255.255.255.224323064 split →
/28255.255.255.2401614128 split →
/29255.255.255.24886256 split →
/30255.255.255.25242512 split →
/31255.255.255.254221,024 split →
/32255.255.255.255112,048 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 →