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)10.78.64.0/20
network10.78.64.0/20
broadcast10.78.79.255
first host10.78.64.1
last host10.78.79.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.78.64.0/20
address00001010.01001110.01000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.01001110.01000000.00000000
broadcast00001010.01001110.01001111.11111111
green = network part, grey = host part
hex0x0a4e4000
decimal172900352
reverse dns0.64.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:4000

/20 split into /27 · 128 subnets

close ×
#networkhost rangebroadcast
110.78.64.0/2710.78.64.1 – 10.78.64.3010.78.64.31
210.78.64.32/2710.78.64.33 – 10.78.64.6210.78.64.63
310.78.64.64/2710.78.64.65 – 10.78.64.9410.78.64.95
410.78.64.96/2710.78.64.97 – 10.78.64.12610.78.64.127
510.78.64.128/2710.78.64.129 – 10.78.64.15810.78.64.159
610.78.64.160/2710.78.64.161 – 10.78.64.19010.78.64.191
710.78.64.192/2710.78.64.193 – 10.78.64.22210.78.64.223
810.78.64.224/2710.78.64.225 – 10.78.64.25410.78.64.255
910.78.65.0/2710.78.65.1 – 10.78.65.3010.78.65.31
1010.78.65.32/2710.78.65.33 – 10.78.65.6210.78.65.63
1110.78.65.64/2710.78.65.65 – 10.78.65.9410.78.65.95
1210.78.65.96/2710.78.65.97 – 10.78.65.12610.78.65.127
1310.78.65.128/2710.78.65.129 – 10.78.65.15810.78.65.159
1410.78.65.160/2710.78.65.161 – 10.78.65.19010.78.65.191
1510.78.65.192/2710.78.65.193 – 10.78.65.22210.78.65.223
1610.78.65.224/2710.78.65.225 – 10.78.65.25410.78.65.255
1710.78.66.0/2710.78.66.1 – 10.78.66.3010.78.66.31
1810.78.66.32/2710.78.66.33 – 10.78.66.6210.78.66.63
1910.78.66.64/2710.78.66.65 – 10.78.66.9410.78.66.95
2010.78.66.96/2710.78.66.97 – 10.78.66.12610.78.66.127
2110.78.66.128/2710.78.66.129 – 10.78.66.15810.78.66.159
2210.78.66.160/2710.78.66.161 – 10.78.66.19010.78.66.191
2310.78.66.192/2710.78.66.193 – 10.78.66.22210.78.66.223
2410.78.66.224/2710.78.66.225 – 10.78.66.25410.78.66.255
2510.78.67.0/2710.78.67.1 – 10.78.67.3010.78.67.31
2610.78.67.32/2710.78.67.33 – 10.78.67.6210.78.67.63
2710.78.67.64/2710.78.67.65 – 10.78.67.9410.78.67.95
2810.78.67.96/2710.78.67.97 – 10.78.67.12610.78.67.127
2910.78.67.128/2710.78.67.129 – 10.78.67.15810.78.67.159
3010.78.67.160/2710.78.67.161 – 10.78.67.19010.78.67.191
3110.78.67.192/2710.78.67.193 – 10.78.67.22210.78.67.223
3210.78.67.224/2710.78.67.225 – 10.78.67.25410.78.67.255
3310.78.68.0/2710.78.68.1 – 10.78.68.3010.78.68.31
3410.78.68.32/2710.78.68.33 – 10.78.68.6210.78.68.63
3510.78.68.64/2710.78.68.65 – 10.78.68.9410.78.68.95
3610.78.68.96/2710.78.68.97 – 10.78.68.12610.78.68.127
3710.78.68.128/2710.78.68.129 – 10.78.68.15810.78.68.159
3810.78.68.160/2710.78.68.161 – 10.78.68.19010.78.68.191
3910.78.68.192/2710.78.68.193 – 10.78.68.22210.78.68.223
4010.78.68.224/2710.78.68.225 – 10.78.68.25410.78.68.255
4110.78.69.0/2710.78.69.1 – 10.78.69.3010.78.69.31
4210.78.69.32/2710.78.69.33 – 10.78.69.6210.78.69.63
4310.78.69.64/2710.78.69.65 – 10.78.69.9410.78.69.95
4410.78.69.96/2710.78.69.97 – 10.78.69.12610.78.69.127
4510.78.69.128/2710.78.69.129 – 10.78.69.15810.78.69.159
4610.78.69.160/2710.78.69.161 – 10.78.69.19010.78.69.191
4710.78.69.192/2710.78.69.193 – 10.78.69.22210.78.69.223
4810.78.69.224/2710.78.69.225 – 10.78.69.25410.78.69.255
4910.78.70.0/2710.78.70.1 – 10.78.70.3010.78.70.31
5010.78.70.32/2710.78.70.33 – 10.78.70.6210.78.70.63
5110.78.70.64/2710.78.70.65 – 10.78.70.9410.78.70.95
5210.78.70.96/2710.78.70.97 – 10.78.70.12610.78.70.127
5310.78.70.128/2710.78.70.129 – 10.78.70.15810.78.70.159
5410.78.70.160/2710.78.70.161 – 10.78.70.19010.78.70.191
5510.78.70.192/2710.78.70.193 – 10.78.70.22210.78.70.223
5610.78.70.224/2710.78.70.225 – 10.78.70.25410.78.70.255
5710.78.71.0/2710.78.71.1 – 10.78.71.3010.78.71.31
5810.78.71.32/2710.78.71.33 – 10.78.71.6210.78.71.63
5910.78.71.64/2710.78.71.65 – 10.78.71.9410.78.71.95
6010.78.71.96/2710.78.71.97 – 10.78.71.12610.78.71.127
6110.78.71.128/2710.78.71.129 – 10.78.71.15810.78.71.159
6210.78.71.160/2710.78.71.161 – 10.78.71.19010.78.71.191
6310.78.71.192/2710.78.71.193 – 10.78.71.22210.78.71.223
6410.78.71.224/2710.78.71.225 – 10.78.71.25410.78.71.255
6510.78.72.0/2710.78.72.1 – 10.78.72.3010.78.72.31
6610.78.72.32/2710.78.72.33 – 10.78.72.6210.78.72.63
6710.78.72.64/2710.78.72.65 – 10.78.72.9410.78.72.95
6810.78.72.96/2710.78.72.97 – 10.78.72.12610.78.72.127
6910.78.72.128/2710.78.72.129 – 10.78.72.15810.78.72.159
7010.78.72.160/2710.78.72.161 – 10.78.72.19010.78.72.191
7110.78.72.192/2710.78.72.193 – 10.78.72.22210.78.72.223
7210.78.72.224/2710.78.72.225 – 10.78.72.25410.78.72.255
7310.78.73.0/2710.78.73.1 – 10.78.73.3010.78.73.31
7410.78.73.32/2710.78.73.33 – 10.78.73.6210.78.73.63
7510.78.73.64/2710.78.73.65 – 10.78.73.9410.78.73.95
7610.78.73.96/2710.78.73.97 – 10.78.73.12610.78.73.127
7710.78.73.128/2710.78.73.129 – 10.78.73.15810.78.73.159
7810.78.73.160/2710.78.73.161 – 10.78.73.19010.78.73.191
7910.78.73.192/2710.78.73.193 – 10.78.73.22210.78.73.223
8010.78.73.224/2710.78.73.225 – 10.78.73.25410.78.73.255
8110.78.74.0/2710.78.74.1 – 10.78.74.3010.78.74.31
8210.78.74.32/2710.78.74.33 – 10.78.74.6210.78.74.63
8310.78.74.64/2710.78.74.65 – 10.78.74.9410.78.74.95
8410.78.74.96/2710.78.74.97 – 10.78.74.12610.78.74.127
8510.78.74.128/2710.78.74.129 – 10.78.74.15810.78.74.159
8610.78.74.160/2710.78.74.161 – 10.78.74.19010.78.74.191
8710.78.74.192/2710.78.74.193 – 10.78.74.22210.78.74.223
8810.78.74.224/2710.78.74.225 – 10.78.74.25410.78.74.255
8910.78.75.0/2710.78.75.1 – 10.78.75.3010.78.75.31
9010.78.75.32/2710.78.75.33 – 10.78.75.6210.78.75.63
9110.78.75.64/2710.78.75.65 – 10.78.75.9410.78.75.95
9210.78.75.96/2710.78.75.97 – 10.78.75.12610.78.75.127
9310.78.75.128/2710.78.75.129 – 10.78.75.15810.78.75.159
9410.78.75.160/2710.78.75.161 – 10.78.75.19010.78.75.191
9510.78.75.192/2710.78.75.193 – 10.78.75.22210.78.75.223
9610.78.75.224/2710.78.75.225 – 10.78.75.25410.78.75.255
9710.78.76.0/2710.78.76.1 – 10.78.76.3010.78.76.31
9810.78.76.32/2710.78.76.33 – 10.78.76.6210.78.76.63
9910.78.76.64/2710.78.76.65 – 10.78.76.9410.78.76.95
10010.78.76.96/2710.78.76.97 – 10.78.76.12610.78.76.127
10110.78.76.128/2710.78.76.129 – 10.78.76.15810.78.76.159
10210.78.76.160/2710.78.76.161 – 10.78.76.19010.78.76.191
10310.78.76.192/2710.78.76.193 – 10.78.76.22210.78.76.223
10410.78.76.224/2710.78.76.225 – 10.78.76.25410.78.76.255
10510.78.77.0/2710.78.77.1 – 10.78.77.3010.78.77.31
10610.78.77.32/2710.78.77.33 – 10.78.77.6210.78.77.63
10710.78.77.64/2710.78.77.65 – 10.78.77.9410.78.77.95
10810.78.77.96/2710.78.77.97 – 10.78.77.12610.78.77.127
10910.78.77.128/2710.78.77.129 – 10.78.77.15810.78.77.159
11010.78.77.160/2710.78.77.161 – 10.78.77.19010.78.77.191
11110.78.77.192/2710.78.77.193 – 10.78.77.22210.78.77.223
11210.78.77.224/2710.78.77.225 – 10.78.77.25410.78.77.255
11310.78.78.0/2710.78.78.1 – 10.78.78.3010.78.78.31
11410.78.78.32/2710.78.78.33 – 10.78.78.6210.78.78.63
11510.78.78.64/2710.78.78.65 – 10.78.78.9410.78.78.95
11610.78.78.96/2710.78.78.97 – 10.78.78.12610.78.78.127
11710.78.78.128/2710.78.78.129 – 10.78.78.15810.78.78.159
11810.78.78.160/2710.78.78.161 – 10.78.78.19010.78.78.191
11910.78.78.192/2710.78.78.193 – 10.78.78.22210.78.78.223
12010.78.78.224/2710.78.78.225 – 10.78.78.25410.78.78.255
12110.78.79.0/2710.78.79.1 – 10.78.79.3010.78.79.31
12210.78.79.32/2710.78.79.33 – 10.78.79.6210.78.79.63
12310.78.79.64/2710.78.79.65 – 10.78.79.9410.78.79.95
12410.78.79.96/2710.78.79.97 – 10.78.79.12610.78.79.127
12510.78.79.128/2710.78.79.129 – 10.78.79.15810.78.79.159
12610.78.79.160/2710.78.79.161 – 10.78.79.19010.78.79.191
12710.78.79.192/2710.78.79.193 – 10.78.79.22210.78.79.223
12810.78.79.224/2710.78.79.225 – 10.78.79.25410.78.79.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /20
/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-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 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 →