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)10.72.16.0/20
network10.72.16.0/20
broadcast10.72.31.255
first host10.72.16.1
last host10.72.31.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.72.16.0/20
address00001010.01001000.00010000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.01001000.00010000.00000000
broadcast00001010.01001000.00011111.11111111
green = network part, grey = host part
hex0x0a481000
decimal172494848
reverse dns0.16.72.10.in-addr.arpa
ipv4-mapped::ffff:a48:1000

/20 split into /27 · 128 subnets

close ×
#networkhost rangebroadcast
110.72.16.0/2710.72.16.1 – 10.72.16.3010.72.16.31
210.72.16.32/2710.72.16.33 – 10.72.16.6210.72.16.63
310.72.16.64/2710.72.16.65 – 10.72.16.9410.72.16.95
410.72.16.96/2710.72.16.97 – 10.72.16.12610.72.16.127
510.72.16.128/2710.72.16.129 – 10.72.16.15810.72.16.159
610.72.16.160/2710.72.16.161 – 10.72.16.19010.72.16.191
710.72.16.192/2710.72.16.193 – 10.72.16.22210.72.16.223
810.72.16.224/2710.72.16.225 – 10.72.16.25410.72.16.255
910.72.17.0/2710.72.17.1 – 10.72.17.3010.72.17.31
1010.72.17.32/2710.72.17.33 – 10.72.17.6210.72.17.63
1110.72.17.64/2710.72.17.65 – 10.72.17.9410.72.17.95
1210.72.17.96/2710.72.17.97 – 10.72.17.12610.72.17.127
1310.72.17.128/2710.72.17.129 – 10.72.17.15810.72.17.159
1410.72.17.160/2710.72.17.161 – 10.72.17.19010.72.17.191
1510.72.17.192/2710.72.17.193 – 10.72.17.22210.72.17.223
1610.72.17.224/2710.72.17.225 – 10.72.17.25410.72.17.255
1710.72.18.0/2710.72.18.1 – 10.72.18.3010.72.18.31
1810.72.18.32/2710.72.18.33 – 10.72.18.6210.72.18.63
1910.72.18.64/2710.72.18.65 – 10.72.18.9410.72.18.95
2010.72.18.96/2710.72.18.97 – 10.72.18.12610.72.18.127
2110.72.18.128/2710.72.18.129 – 10.72.18.15810.72.18.159
2210.72.18.160/2710.72.18.161 – 10.72.18.19010.72.18.191
2310.72.18.192/2710.72.18.193 – 10.72.18.22210.72.18.223
2410.72.18.224/2710.72.18.225 – 10.72.18.25410.72.18.255
2510.72.19.0/2710.72.19.1 – 10.72.19.3010.72.19.31
2610.72.19.32/2710.72.19.33 – 10.72.19.6210.72.19.63
2710.72.19.64/2710.72.19.65 – 10.72.19.9410.72.19.95
2810.72.19.96/2710.72.19.97 – 10.72.19.12610.72.19.127
2910.72.19.128/2710.72.19.129 – 10.72.19.15810.72.19.159
3010.72.19.160/2710.72.19.161 – 10.72.19.19010.72.19.191
3110.72.19.192/2710.72.19.193 – 10.72.19.22210.72.19.223
3210.72.19.224/2710.72.19.225 – 10.72.19.25410.72.19.255
3310.72.20.0/2710.72.20.1 – 10.72.20.3010.72.20.31
3410.72.20.32/2710.72.20.33 – 10.72.20.6210.72.20.63
3510.72.20.64/2710.72.20.65 – 10.72.20.9410.72.20.95
3610.72.20.96/2710.72.20.97 – 10.72.20.12610.72.20.127
3710.72.20.128/2710.72.20.129 – 10.72.20.15810.72.20.159
3810.72.20.160/2710.72.20.161 – 10.72.20.19010.72.20.191
3910.72.20.192/2710.72.20.193 – 10.72.20.22210.72.20.223
4010.72.20.224/2710.72.20.225 – 10.72.20.25410.72.20.255
4110.72.21.0/2710.72.21.1 – 10.72.21.3010.72.21.31
4210.72.21.32/2710.72.21.33 – 10.72.21.6210.72.21.63
4310.72.21.64/2710.72.21.65 – 10.72.21.9410.72.21.95
4410.72.21.96/2710.72.21.97 – 10.72.21.12610.72.21.127
4510.72.21.128/2710.72.21.129 – 10.72.21.15810.72.21.159
4610.72.21.160/2710.72.21.161 – 10.72.21.19010.72.21.191
4710.72.21.192/2710.72.21.193 – 10.72.21.22210.72.21.223
4810.72.21.224/2710.72.21.225 – 10.72.21.25410.72.21.255
4910.72.22.0/2710.72.22.1 – 10.72.22.3010.72.22.31
5010.72.22.32/2710.72.22.33 – 10.72.22.6210.72.22.63
5110.72.22.64/2710.72.22.65 – 10.72.22.9410.72.22.95
5210.72.22.96/2710.72.22.97 – 10.72.22.12610.72.22.127
5310.72.22.128/2710.72.22.129 – 10.72.22.15810.72.22.159
5410.72.22.160/2710.72.22.161 – 10.72.22.19010.72.22.191
5510.72.22.192/2710.72.22.193 – 10.72.22.22210.72.22.223
5610.72.22.224/2710.72.22.225 – 10.72.22.25410.72.22.255
5710.72.23.0/2710.72.23.1 – 10.72.23.3010.72.23.31
5810.72.23.32/2710.72.23.33 – 10.72.23.6210.72.23.63
5910.72.23.64/2710.72.23.65 – 10.72.23.9410.72.23.95
6010.72.23.96/2710.72.23.97 – 10.72.23.12610.72.23.127
6110.72.23.128/2710.72.23.129 – 10.72.23.15810.72.23.159
6210.72.23.160/2710.72.23.161 – 10.72.23.19010.72.23.191
6310.72.23.192/2710.72.23.193 – 10.72.23.22210.72.23.223
6410.72.23.224/2710.72.23.225 – 10.72.23.25410.72.23.255
6510.72.24.0/2710.72.24.1 – 10.72.24.3010.72.24.31
6610.72.24.32/2710.72.24.33 – 10.72.24.6210.72.24.63
6710.72.24.64/2710.72.24.65 – 10.72.24.9410.72.24.95
6810.72.24.96/2710.72.24.97 – 10.72.24.12610.72.24.127
6910.72.24.128/2710.72.24.129 – 10.72.24.15810.72.24.159
7010.72.24.160/2710.72.24.161 – 10.72.24.19010.72.24.191
7110.72.24.192/2710.72.24.193 – 10.72.24.22210.72.24.223
7210.72.24.224/2710.72.24.225 – 10.72.24.25410.72.24.255
7310.72.25.0/2710.72.25.1 – 10.72.25.3010.72.25.31
7410.72.25.32/2710.72.25.33 – 10.72.25.6210.72.25.63
7510.72.25.64/2710.72.25.65 – 10.72.25.9410.72.25.95
7610.72.25.96/2710.72.25.97 – 10.72.25.12610.72.25.127
7710.72.25.128/2710.72.25.129 – 10.72.25.15810.72.25.159
7810.72.25.160/2710.72.25.161 – 10.72.25.19010.72.25.191
7910.72.25.192/2710.72.25.193 – 10.72.25.22210.72.25.223
8010.72.25.224/2710.72.25.225 – 10.72.25.25410.72.25.255
8110.72.26.0/2710.72.26.1 – 10.72.26.3010.72.26.31
8210.72.26.32/2710.72.26.33 – 10.72.26.6210.72.26.63
8310.72.26.64/2710.72.26.65 – 10.72.26.9410.72.26.95
8410.72.26.96/2710.72.26.97 – 10.72.26.12610.72.26.127
8510.72.26.128/2710.72.26.129 – 10.72.26.15810.72.26.159
8610.72.26.160/2710.72.26.161 – 10.72.26.19010.72.26.191
8710.72.26.192/2710.72.26.193 – 10.72.26.22210.72.26.223
8810.72.26.224/2710.72.26.225 – 10.72.26.25410.72.26.255
8910.72.27.0/2710.72.27.1 – 10.72.27.3010.72.27.31
9010.72.27.32/2710.72.27.33 – 10.72.27.6210.72.27.63
9110.72.27.64/2710.72.27.65 – 10.72.27.9410.72.27.95
9210.72.27.96/2710.72.27.97 – 10.72.27.12610.72.27.127
9310.72.27.128/2710.72.27.129 – 10.72.27.15810.72.27.159
9410.72.27.160/2710.72.27.161 – 10.72.27.19010.72.27.191
9510.72.27.192/2710.72.27.193 – 10.72.27.22210.72.27.223
9610.72.27.224/2710.72.27.225 – 10.72.27.25410.72.27.255
9710.72.28.0/2710.72.28.1 – 10.72.28.3010.72.28.31
9810.72.28.32/2710.72.28.33 – 10.72.28.6210.72.28.63
9910.72.28.64/2710.72.28.65 – 10.72.28.9410.72.28.95
10010.72.28.96/2710.72.28.97 – 10.72.28.12610.72.28.127
10110.72.28.128/2710.72.28.129 – 10.72.28.15810.72.28.159
10210.72.28.160/2710.72.28.161 – 10.72.28.19010.72.28.191
10310.72.28.192/2710.72.28.193 – 10.72.28.22210.72.28.223
10410.72.28.224/2710.72.28.225 – 10.72.28.25410.72.28.255
10510.72.29.0/2710.72.29.1 – 10.72.29.3010.72.29.31
10610.72.29.32/2710.72.29.33 – 10.72.29.6210.72.29.63
10710.72.29.64/2710.72.29.65 – 10.72.29.9410.72.29.95
10810.72.29.96/2710.72.29.97 – 10.72.29.12610.72.29.127
10910.72.29.128/2710.72.29.129 – 10.72.29.15810.72.29.159
11010.72.29.160/2710.72.29.161 – 10.72.29.19010.72.29.191
11110.72.29.192/2710.72.29.193 – 10.72.29.22210.72.29.223
11210.72.29.224/2710.72.29.225 – 10.72.29.25410.72.29.255
11310.72.30.0/2710.72.30.1 – 10.72.30.3010.72.30.31
11410.72.30.32/2710.72.30.33 – 10.72.30.6210.72.30.63
11510.72.30.64/2710.72.30.65 – 10.72.30.9410.72.30.95
11610.72.30.96/2710.72.30.97 – 10.72.30.12610.72.30.127
11710.72.30.128/2710.72.30.129 – 10.72.30.15810.72.30.159
11810.72.30.160/2710.72.30.161 – 10.72.30.19010.72.30.191
11910.72.30.192/2710.72.30.193 – 10.72.30.22210.72.30.223
12010.72.30.224/2710.72.30.225 – 10.72.30.25410.72.30.255
12110.72.31.0/2710.72.31.1 – 10.72.31.3010.72.31.31
12210.72.31.32/2710.72.31.33 – 10.72.31.6210.72.31.63
12310.72.31.64/2710.72.31.65 – 10.72.31.9410.72.31.95
12410.72.31.96/2710.72.31.97 – 10.72.31.12610.72.31.127
12510.72.31.128/2710.72.31.129 – 10.72.31.15810.72.31.159
12610.72.31.160/2710.72.31.161 – 10.72.31.19010.72.31.191
12710.72.31.192/2710.72.31.193 – 10.72.31.22210.72.31.223
12810.72.31.224/2710.72.31.225 – 10.72.31.25410.72.31.255
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 →