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)10.15.16.0/20
network10.15.16.0/20
broadcast10.15.31.255
first host10.15.16.1
last host10.15.31.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.15.16.0/20
address00001010.00001111.00010000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00001111.00010000.00000000
broadcast00001010.00001111.00011111.11111111
green = network part, grey = host part
hex0x0a0f1000
decimal168759296
reverse dns0.16.15.10.in-addr.arpa
ipv4-mapped::ffff:a0f:1000

/20 split into /27 · 128 subnets

close ×
#networkhost rangebroadcast
110.15.16.0/2710.15.16.1 – 10.15.16.3010.15.16.31
210.15.16.32/2710.15.16.33 – 10.15.16.6210.15.16.63
310.15.16.64/2710.15.16.65 – 10.15.16.9410.15.16.95
410.15.16.96/2710.15.16.97 – 10.15.16.12610.15.16.127
510.15.16.128/2710.15.16.129 – 10.15.16.15810.15.16.159
610.15.16.160/2710.15.16.161 – 10.15.16.19010.15.16.191
710.15.16.192/2710.15.16.193 – 10.15.16.22210.15.16.223
810.15.16.224/2710.15.16.225 – 10.15.16.25410.15.16.255
910.15.17.0/2710.15.17.1 – 10.15.17.3010.15.17.31
1010.15.17.32/2710.15.17.33 – 10.15.17.6210.15.17.63
1110.15.17.64/2710.15.17.65 – 10.15.17.9410.15.17.95
1210.15.17.96/2710.15.17.97 – 10.15.17.12610.15.17.127
1310.15.17.128/2710.15.17.129 – 10.15.17.15810.15.17.159
1410.15.17.160/2710.15.17.161 – 10.15.17.19010.15.17.191
1510.15.17.192/2710.15.17.193 – 10.15.17.22210.15.17.223
1610.15.17.224/2710.15.17.225 – 10.15.17.25410.15.17.255
1710.15.18.0/2710.15.18.1 – 10.15.18.3010.15.18.31
1810.15.18.32/2710.15.18.33 – 10.15.18.6210.15.18.63
1910.15.18.64/2710.15.18.65 – 10.15.18.9410.15.18.95
2010.15.18.96/2710.15.18.97 – 10.15.18.12610.15.18.127
2110.15.18.128/2710.15.18.129 – 10.15.18.15810.15.18.159
2210.15.18.160/2710.15.18.161 – 10.15.18.19010.15.18.191
2310.15.18.192/2710.15.18.193 – 10.15.18.22210.15.18.223
2410.15.18.224/2710.15.18.225 – 10.15.18.25410.15.18.255
2510.15.19.0/2710.15.19.1 – 10.15.19.3010.15.19.31
2610.15.19.32/2710.15.19.33 – 10.15.19.6210.15.19.63
2710.15.19.64/2710.15.19.65 – 10.15.19.9410.15.19.95
2810.15.19.96/2710.15.19.97 – 10.15.19.12610.15.19.127
2910.15.19.128/2710.15.19.129 – 10.15.19.15810.15.19.159
3010.15.19.160/2710.15.19.161 – 10.15.19.19010.15.19.191
3110.15.19.192/2710.15.19.193 – 10.15.19.22210.15.19.223
3210.15.19.224/2710.15.19.225 – 10.15.19.25410.15.19.255
3310.15.20.0/2710.15.20.1 – 10.15.20.3010.15.20.31
3410.15.20.32/2710.15.20.33 – 10.15.20.6210.15.20.63
3510.15.20.64/2710.15.20.65 – 10.15.20.9410.15.20.95
3610.15.20.96/2710.15.20.97 – 10.15.20.12610.15.20.127
3710.15.20.128/2710.15.20.129 – 10.15.20.15810.15.20.159
3810.15.20.160/2710.15.20.161 – 10.15.20.19010.15.20.191
3910.15.20.192/2710.15.20.193 – 10.15.20.22210.15.20.223
4010.15.20.224/2710.15.20.225 – 10.15.20.25410.15.20.255
4110.15.21.0/2710.15.21.1 – 10.15.21.3010.15.21.31
4210.15.21.32/2710.15.21.33 – 10.15.21.6210.15.21.63
4310.15.21.64/2710.15.21.65 – 10.15.21.9410.15.21.95
4410.15.21.96/2710.15.21.97 – 10.15.21.12610.15.21.127
4510.15.21.128/2710.15.21.129 – 10.15.21.15810.15.21.159
4610.15.21.160/2710.15.21.161 – 10.15.21.19010.15.21.191
4710.15.21.192/2710.15.21.193 – 10.15.21.22210.15.21.223
4810.15.21.224/2710.15.21.225 – 10.15.21.25410.15.21.255
4910.15.22.0/2710.15.22.1 – 10.15.22.3010.15.22.31
5010.15.22.32/2710.15.22.33 – 10.15.22.6210.15.22.63
5110.15.22.64/2710.15.22.65 – 10.15.22.9410.15.22.95
5210.15.22.96/2710.15.22.97 – 10.15.22.12610.15.22.127
5310.15.22.128/2710.15.22.129 – 10.15.22.15810.15.22.159
5410.15.22.160/2710.15.22.161 – 10.15.22.19010.15.22.191
5510.15.22.192/2710.15.22.193 – 10.15.22.22210.15.22.223
5610.15.22.224/2710.15.22.225 – 10.15.22.25410.15.22.255
5710.15.23.0/2710.15.23.1 – 10.15.23.3010.15.23.31
5810.15.23.32/2710.15.23.33 – 10.15.23.6210.15.23.63
5910.15.23.64/2710.15.23.65 – 10.15.23.9410.15.23.95
6010.15.23.96/2710.15.23.97 – 10.15.23.12610.15.23.127
6110.15.23.128/2710.15.23.129 – 10.15.23.15810.15.23.159
6210.15.23.160/2710.15.23.161 – 10.15.23.19010.15.23.191
6310.15.23.192/2710.15.23.193 – 10.15.23.22210.15.23.223
6410.15.23.224/2710.15.23.225 – 10.15.23.25410.15.23.255
6510.15.24.0/2710.15.24.1 – 10.15.24.3010.15.24.31
6610.15.24.32/2710.15.24.33 – 10.15.24.6210.15.24.63
6710.15.24.64/2710.15.24.65 – 10.15.24.9410.15.24.95
6810.15.24.96/2710.15.24.97 – 10.15.24.12610.15.24.127
6910.15.24.128/2710.15.24.129 – 10.15.24.15810.15.24.159
7010.15.24.160/2710.15.24.161 – 10.15.24.19010.15.24.191
7110.15.24.192/2710.15.24.193 – 10.15.24.22210.15.24.223
7210.15.24.224/2710.15.24.225 – 10.15.24.25410.15.24.255
7310.15.25.0/2710.15.25.1 – 10.15.25.3010.15.25.31
7410.15.25.32/2710.15.25.33 – 10.15.25.6210.15.25.63
7510.15.25.64/2710.15.25.65 – 10.15.25.9410.15.25.95
7610.15.25.96/2710.15.25.97 – 10.15.25.12610.15.25.127
7710.15.25.128/2710.15.25.129 – 10.15.25.15810.15.25.159
7810.15.25.160/2710.15.25.161 – 10.15.25.19010.15.25.191
7910.15.25.192/2710.15.25.193 – 10.15.25.22210.15.25.223
8010.15.25.224/2710.15.25.225 – 10.15.25.25410.15.25.255
8110.15.26.0/2710.15.26.1 – 10.15.26.3010.15.26.31
8210.15.26.32/2710.15.26.33 – 10.15.26.6210.15.26.63
8310.15.26.64/2710.15.26.65 – 10.15.26.9410.15.26.95
8410.15.26.96/2710.15.26.97 – 10.15.26.12610.15.26.127
8510.15.26.128/2710.15.26.129 – 10.15.26.15810.15.26.159
8610.15.26.160/2710.15.26.161 – 10.15.26.19010.15.26.191
8710.15.26.192/2710.15.26.193 – 10.15.26.22210.15.26.223
8810.15.26.224/2710.15.26.225 – 10.15.26.25410.15.26.255
8910.15.27.0/2710.15.27.1 – 10.15.27.3010.15.27.31
9010.15.27.32/2710.15.27.33 – 10.15.27.6210.15.27.63
9110.15.27.64/2710.15.27.65 – 10.15.27.9410.15.27.95
9210.15.27.96/2710.15.27.97 – 10.15.27.12610.15.27.127
9310.15.27.128/2710.15.27.129 – 10.15.27.15810.15.27.159
9410.15.27.160/2710.15.27.161 – 10.15.27.19010.15.27.191
9510.15.27.192/2710.15.27.193 – 10.15.27.22210.15.27.223
9610.15.27.224/2710.15.27.225 – 10.15.27.25410.15.27.255
9710.15.28.0/2710.15.28.1 – 10.15.28.3010.15.28.31
9810.15.28.32/2710.15.28.33 – 10.15.28.6210.15.28.63
9910.15.28.64/2710.15.28.65 – 10.15.28.9410.15.28.95
10010.15.28.96/2710.15.28.97 – 10.15.28.12610.15.28.127
10110.15.28.128/2710.15.28.129 – 10.15.28.15810.15.28.159
10210.15.28.160/2710.15.28.161 – 10.15.28.19010.15.28.191
10310.15.28.192/2710.15.28.193 – 10.15.28.22210.15.28.223
10410.15.28.224/2710.15.28.225 – 10.15.28.25410.15.28.255
10510.15.29.0/2710.15.29.1 – 10.15.29.3010.15.29.31
10610.15.29.32/2710.15.29.33 – 10.15.29.6210.15.29.63
10710.15.29.64/2710.15.29.65 – 10.15.29.9410.15.29.95
10810.15.29.96/2710.15.29.97 – 10.15.29.12610.15.29.127
10910.15.29.128/2710.15.29.129 – 10.15.29.15810.15.29.159
11010.15.29.160/2710.15.29.161 – 10.15.29.19010.15.29.191
11110.15.29.192/2710.15.29.193 – 10.15.29.22210.15.29.223
11210.15.29.224/2710.15.29.225 – 10.15.29.25410.15.29.255
11310.15.30.0/2710.15.30.1 – 10.15.30.3010.15.30.31
11410.15.30.32/2710.15.30.33 – 10.15.30.6210.15.30.63
11510.15.30.64/2710.15.30.65 – 10.15.30.9410.15.30.95
11610.15.30.96/2710.15.30.97 – 10.15.30.12610.15.30.127
11710.15.30.128/2710.15.30.129 – 10.15.30.15810.15.30.159
11810.15.30.160/2710.15.30.161 – 10.15.30.19010.15.30.191
11910.15.30.192/2710.15.30.193 – 10.15.30.22210.15.30.223
12010.15.30.224/2710.15.30.225 – 10.15.30.25410.15.30.255
12110.15.31.0/2710.15.31.1 – 10.15.31.3010.15.31.31
12210.15.31.32/2710.15.31.33 – 10.15.31.6210.15.31.63
12310.15.31.64/2710.15.31.65 – 10.15.31.9410.15.31.95
12410.15.31.96/2710.15.31.97 – 10.15.31.12610.15.31.127
12510.15.31.128/2710.15.31.129 – 10.15.31.15810.15.31.159
12610.15.31.160/2710.15.31.161 – 10.15.31.19010.15.31.191
12710.15.31.192/2710.15.31.193 – 10.15.31.22210.15.31.223
12810.15.31.224/2710.15.31.225 – 10.15.31.25410.15.31.255
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 →