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)10.20.0.0/18
network10.20.0.0/18
broadcast10.20.63.255
first host10.20.0.1
last host10.20.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.20.0.0/18
address00001010.00010100.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010100.00000000.00000000
broadcast00001010.00010100.00111111.11111111
green = network part, grey = host part
hex0x0a140000
decimal169082880
reverse dns0.0.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.20.0.0/2510.20.0.1 – 10.20.0.12610.20.0.127
210.20.0.128/2510.20.0.129 – 10.20.0.25410.20.0.255
310.20.1.0/2510.20.1.1 – 10.20.1.12610.20.1.127
410.20.1.128/2510.20.1.129 – 10.20.1.25410.20.1.255
510.20.2.0/2510.20.2.1 – 10.20.2.12610.20.2.127
610.20.2.128/2510.20.2.129 – 10.20.2.25410.20.2.255
710.20.3.0/2510.20.3.1 – 10.20.3.12610.20.3.127
810.20.3.128/2510.20.3.129 – 10.20.3.25410.20.3.255
910.20.4.0/2510.20.4.1 – 10.20.4.12610.20.4.127
1010.20.4.128/2510.20.4.129 – 10.20.4.25410.20.4.255
1110.20.5.0/2510.20.5.1 – 10.20.5.12610.20.5.127
1210.20.5.128/2510.20.5.129 – 10.20.5.25410.20.5.255
1310.20.6.0/2510.20.6.1 – 10.20.6.12610.20.6.127
1410.20.6.128/2510.20.6.129 – 10.20.6.25410.20.6.255
1510.20.7.0/2510.20.7.1 – 10.20.7.12610.20.7.127
1610.20.7.128/2510.20.7.129 – 10.20.7.25410.20.7.255
1710.20.8.0/2510.20.8.1 – 10.20.8.12610.20.8.127
1810.20.8.128/2510.20.8.129 – 10.20.8.25410.20.8.255
1910.20.9.0/2510.20.9.1 – 10.20.9.12610.20.9.127
2010.20.9.128/2510.20.9.129 – 10.20.9.25410.20.9.255
2110.20.10.0/2510.20.10.1 – 10.20.10.12610.20.10.127
2210.20.10.128/2510.20.10.129 – 10.20.10.25410.20.10.255
2310.20.11.0/2510.20.11.1 – 10.20.11.12610.20.11.127
2410.20.11.128/2510.20.11.129 – 10.20.11.25410.20.11.255
2510.20.12.0/2510.20.12.1 – 10.20.12.12610.20.12.127
2610.20.12.128/2510.20.12.129 – 10.20.12.25410.20.12.255
2710.20.13.0/2510.20.13.1 – 10.20.13.12610.20.13.127
2810.20.13.128/2510.20.13.129 – 10.20.13.25410.20.13.255
2910.20.14.0/2510.20.14.1 – 10.20.14.12610.20.14.127
3010.20.14.128/2510.20.14.129 – 10.20.14.25410.20.14.255
3110.20.15.0/2510.20.15.1 – 10.20.15.12610.20.15.127
3210.20.15.128/2510.20.15.129 – 10.20.15.25410.20.15.255
3310.20.16.0/2510.20.16.1 – 10.20.16.12610.20.16.127
3410.20.16.128/2510.20.16.129 – 10.20.16.25410.20.16.255
3510.20.17.0/2510.20.17.1 – 10.20.17.12610.20.17.127
3610.20.17.128/2510.20.17.129 – 10.20.17.25410.20.17.255
3710.20.18.0/2510.20.18.1 – 10.20.18.12610.20.18.127
3810.20.18.128/2510.20.18.129 – 10.20.18.25410.20.18.255
3910.20.19.0/2510.20.19.1 – 10.20.19.12610.20.19.127
4010.20.19.128/2510.20.19.129 – 10.20.19.25410.20.19.255
4110.20.20.0/2510.20.20.1 – 10.20.20.12610.20.20.127
4210.20.20.128/2510.20.20.129 – 10.20.20.25410.20.20.255
4310.20.21.0/2510.20.21.1 – 10.20.21.12610.20.21.127
4410.20.21.128/2510.20.21.129 – 10.20.21.25410.20.21.255
4510.20.22.0/2510.20.22.1 – 10.20.22.12610.20.22.127
4610.20.22.128/2510.20.22.129 – 10.20.22.25410.20.22.255
4710.20.23.0/2510.20.23.1 – 10.20.23.12610.20.23.127
4810.20.23.128/2510.20.23.129 – 10.20.23.25410.20.23.255
4910.20.24.0/2510.20.24.1 – 10.20.24.12610.20.24.127
5010.20.24.128/2510.20.24.129 – 10.20.24.25410.20.24.255
5110.20.25.0/2510.20.25.1 – 10.20.25.12610.20.25.127
5210.20.25.128/2510.20.25.129 – 10.20.25.25410.20.25.255
5310.20.26.0/2510.20.26.1 – 10.20.26.12610.20.26.127
5410.20.26.128/2510.20.26.129 – 10.20.26.25410.20.26.255
5510.20.27.0/2510.20.27.1 – 10.20.27.12610.20.27.127
5610.20.27.128/2510.20.27.129 – 10.20.27.25410.20.27.255
5710.20.28.0/2510.20.28.1 – 10.20.28.12610.20.28.127
5810.20.28.128/2510.20.28.129 – 10.20.28.25410.20.28.255
5910.20.29.0/2510.20.29.1 – 10.20.29.12610.20.29.127
6010.20.29.128/2510.20.29.129 – 10.20.29.25410.20.29.255
6110.20.30.0/2510.20.30.1 – 10.20.30.12610.20.30.127
6210.20.30.128/2510.20.30.129 – 10.20.30.25410.20.30.255
6310.20.31.0/2510.20.31.1 – 10.20.31.12610.20.31.127
6410.20.31.128/2510.20.31.129 – 10.20.31.25410.20.31.255
6510.20.32.0/2510.20.32.1 – 10.20.32.12610.20.32.127
6610.20.32.128/2510.20.32.129 – 10.20.32.25410.20.32.255
6710.20.33.0/2510.20.33.1 – 10.20.33.12610.20.33.127
6810.20.33.128/2510.20.33.129 – 10.20.33.25410.20.33.255
6910.20.34.0/2510.20.34.1 – 10.20.34.12610.20.34.127
7010.20.34.128/2510.20.34.129 – 10.20.34.25410.20.34.255
7110.20.35.0/2510.20.35.1 – 10.20.35.12610.20.35.127
7210.20.35.128/2510.20.35.129 – 10.20.35.25410.20.35.255
7310.20.36.0/2510.20.36.1 – 10.20.36.12610.20.36.127
7410.20.36.128/2510.20.36.129 – 10.20.36.25410.20.36.255
7510.20.37.0/2510.20.37.1 – 10.20.37.12610.20.37.127
7610.20.37.128/2510.20.37.129 – 10.20.37.25410.20.37.255
7710.20.38.0/2510.20.38.1 – 10.20.38.12610.20.38.127
7810.20.38.128/2510.20.38.129 – 10.20.38.25410.20.38.255
7910.20.39.0/2510.20.39.1 – 10.20.39.12610.20.39.127
8010.20.39.128/2510.20.39.129 – 10.20.39.25410.20.39.255
8110.20.40.0/2510.20.40.1 – 10.20.40.12610.20.40.127
8210.20.40.128/2510.20.40.129 – 10.20.40.25410.20.40.255
8310.20.41.0/2510.20.41.1 – 10.20.41.12610.20.41.127
8410.20.41.128/2510.20.41.129 – 10.20.41.25410.20.41.255
8510.20.42.0/2510.20.42.1 – 10.20.42.12610.20.42.127
8610.20.42.128/2510.20.42.129 – 10.20.42.25410.20.42.255
8710.20.43.0/2510.20.43.1 – 10.20.43.12610.20.43.127
8810.20.43.128/2510.20.43.129 – 10.20.43.25410.20.43.255
8910.20.44.0/2510.20.44.1 – 10.20.44.12610.20.44.127
9010.20.44.128/2510.20.44.129 – 10.20.44.25410.20.44.255
9110.20.45.0/2510.20.45.1 – 10.20.45.12610.20.45.127
9210.20.45.128/2510.20.45.129 – 10.20.45.25410.20.45.255
9310.20.46.0/2510.20.46.1 – 10.20.46.12610.20.46.127
9410.20.46.128/2510.20.46.129 – 10.20.46.25410.20.46.255
9510.20.47.0/2510.20.47.1 – 10.20.47.12610.20.47.127
9610.20.47.128/2510.20.47.129 – 10.20.47.25410.20.47.255
9710.20.48.0/2510.20.48.1 – 10.20.48.12610.20.48.127
9810.20.48.128/2510.20.48.129 – 10.20.48.25410.20.48.255
9910.20.49.0/2510.20.49.1 – 10.20.49.12610.20.49.127
10010.20.49.128/2510.20.49.129 – 10.20.49.25410.20.49.255
10110.20.50.0/2510.20.50.1 – 10.20.50.12610.20.50.127
10210.20.50.128/2510.20.50.129 – 10.20.50.25410.20.50.255
10310.20.51.0/2510.20.51.1 – 10.20.51.12610.20.51.127
10410.20.51.128/2510.20.51.129 – 10.20.51.25410.20.51.255
10510.20.52.0/2510.20.52.1 – 10.20.52.12610.20.52.127
10610.20.52.128/2510.20.52.129 – 10.20.52.25410.20.52.255
10710.20.53.0/2510.20.53.1 – 10.20.53.12610.20.53.127
10810.20.53.128/2510.20.53.129 – 10.20.53.25410.20.53.255
10910.20.54.0/2510.20.54.1 – 10.20.54.12610.20.54.127
11010.20.54.128/2510.20.54.129 – 10.20.54.25410.20.54.255
11110.20.55.0/2510.20.55.1 – 10.20.55.12610.20.55.127
11210.20.55.128/2510.20.55.129 – 10.20.55.25410.20.55.255
11310.20.56.0/2510.20.56.1 – 10.20.56.12610.20.56.127
11410.20.56.128/2510.20.56.129 – 10.20.56.25410.20.56.255
11510.20.57.0/2510.20.57.1 – 10.20.57.12610.20.57.127
11610.20.57.128/2510.20.57.129 – 10.20.57.25410.20.57.255
11710.20.58.0/2510.20.58.1 – 10.20.58.12610.20.58.127
11810.20.58.128/2510.20.58.129 – 10.20.58.25410.20.58.255
11910.20.59.0/2510.20.59.1 – 10.20.59.12610.20.59.127
12010.20.59.128/2510.20.59.129 – 10.20.59.25410.20.59.255
12110.20.60.0/2510.20.60.1 – 10.20.60.12610.20.60.127
12210.20.60.128/2510.20.60.129 – 10.20.60.25410.20.60.255
12310.20.61.0/2510.20.61.1 – 10.20.61.12610.20.61.127
12410.20.61.128/2510.20.61.129 – 10.20.61.25410.20.61.255
12510.20.62.0/2510.20.62.1 – 10.20.62.12610.20.62.127
12610.20.62.128/2510.20.62.129 – 10.20.62.25410.20.62.255
12710.20.63.0/2510.20.63.1 – 10.20.63.12610.20.63.127
12810.20.63.128/2510.20.63.129 – 10.20.63.25410.20.63.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /18
/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-
/18255.255.192.016,38416,3821
/19255.255.224.08,1928,1902 split →
/20255.255.240.04,0964,0944 split →
/21255.255.248.02,0482,0468 split →
/22255.255.252.01,0241,02216 split →
/23255.255.254.051251032 split →
/24255.255.255.025625464 split →
/25255.255.255.128128126128 split →
/26255.255.255.1926462256 split →
/27255.255.255.2243230512 split →
/28255.255.255.24016141,024 split →
/29255.255.255.248862,048 split →
/30255.255.255.252424,096 split →
/31255.255.255.254228,192 split →
/32255.255.255.2551116,384 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 →