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)10.6.0.0/18
network10.6.0.0/18
broadcast10.6.63.255
first host10.6.0.1
last host10.6.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.6.0.0/18
address00001010.00000110.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000110.00000000.00000000
broadcast00001010.00000110.00111111.11111111
green = network part, grey = host part
hex0x0a060000
decimal168165376
reverse dns0.0.6.10.in-addr.arpa
ipv4-mapped::ffff:a06:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.6.0.0/2510.6.0.1 – 10.6.0.12610.6.0.127
210.6.0.128/2510.6.0.129 – 10.6.0.25410.6.0.255
310.6.1.0/2510.6.1.1 – 10.6.1.12610.6.1.127
410.6.1.128/2510.6.1.129 – 10.6.1.25410.6.1.255
510.6.2.0/2510.6.2.1 – 10.6.2.12610.6.2.127
610.6.2.128/2510.6.2.129 – 10.6.2.25410.6.2.255
710.6.3.0/2510.6.3.1 – 10.6.3.12610.6.3.127
810.6.3.128/2510.6.3.129 – 10.6.3.25410.6.3.255
910.6.4.0/2510.6.4.1 – 10.6.4.12610.6.4.127
1010.6.4.128/2510.6.4.129 – 10.6.4.25410.6.4.255
1110.6.5.0/2510.6.5.1 – 10.6.5.12610.6.5.127
1210.6.5.128/2510.6.5.129 – 10.6.5.25410.6.5.255
1310.6.6.0/2510.6.6.1 – 10.6.6.12610.6.6.127
1410.6.6.128/2510.6.6.129 – 10.6.6.25410.6.6.255
1510.6.7.0/2510.6.7.1 – 10.6.7.12610.6.7.127
1610.6.7.128/2510.6.7.129 – 10.6.7.25410.6.7.255
1710.6.8.0/2510.6.8.1 – 10.6.8.12610.6.8.127
1810.6.8.128/2510.6.8.129 – 10.6.8.25410.6.8.255
1910.6.9.0/2510.6.9.1 – 10.6.9.12610.6.9.127
2010.6.9.128/2510.6.9.129 – 10.6.9.25410.6.9.255
2110.6.10.0/2510.6.10.1 – 10.6.10.12610.6.10.127
2210.6.10.128/2510.6.10.129 – 10.6.10.25410.6.10.255
2310.6.11.0/2510.6.11.1 – 10.6.11.12610.6.11.127
2410.6.11.128/2510.6.11.129 – 10.6.11.25410.6.11.255
2510.6.12.0/2510.6.12.1 – 10.6.12.12610.6.12.127
2610.6.12.128/2510.6.12.129 – 10.6.12.25410.6.12.255
2710.6.13.0/2510.6.13.1 – 10.6.13.12610.6.13.127
2810.6.13.128/2510.6.13.129 – 10.6.13.25410.6.13.255
2910.6.14.0/2510.6.14.1 – 10.6.14.12610.6.14.127
3010.6.14.128/2510.6.14.129 – 10.6.14.25410.6.14.255
3110.6.15.0/2510.6.15.1 – 10.6.15.12610.6.15.127
3210.6.15.128/2510.6.15.129 – 10.6.15.25410.6.15.255
3310.6.16.0/2510.6.16.1 – 10.6.16.12610.6.16.127
3410.6.16.128/2510.6.16.129 – 10.6.16.25410.6.16.255
3510.6.17.0/2510.6.17.1 – 10.6.17.12610.6.17.127
3610.6.17.128/2510.6.17.129 – 10.6.17.25410.6.17.255
3710.6.18.0/2510.6.18.1 – 10.6.18.12610.6.18.127
3810.6.18.128/2510.6.18.129 – 10.6.18.25410.6.18.255
3910.6.19.0/2510.6.19.1 – 10.6.19.12610.6.19.127
4010.6.19.128/2510.6.19.129 – 10.6.19.25410.6.19.255
4110.6.20.0/2510.6.20.1 – 10.6.20.12610.6.20.127
4210.6.20.128/2510.6.20.129 – 10.6.20.25410.6.20.255
4310.6.21.0/2510.6.21.1 – 10.6.21.12610.6.21.127
4410.6.21.128/2510.6.21.129 – 10.6.21.25410.6.21.255
4510.6.22.0/2510.6.22.1 – 10.6.22.12610.6.22.127
4610.6.22.128/2510.6.22.129 – 10.6.22.25410.6.22.255
4710.6.23.0/2510.6.23.1 – 10.6.23.12610.6.23.127
4810.6.23.128/2510.6.23.129 – 10.6.23.25410.6.23.255
4910.6.24.0/2510.6.24.1 – 10.6.24.12610.6.24.127
5010.6.24.128/2510.6.24.129 – 10.6.24.25410.6.24.255
5110.6.25.0/2510.6.25.1 – 10.6.25.12610.6.25.127
5210.6.25.128/2510.6.25.129 – 10.6.25.25410.6.25.255
5310.6.26.0/2510.6.26.1 – 10.6.26.12610.6.26.127
5410.6.26.128/2510.6.26.129 – 10.6.26.25410.6.26.255
5510.6.27.0/2510.6.27.1 – 10.6.27.12610.6.27.127
5610.6.27.128/2510.6.27.129 – 10.6.27.25410.6.27.255
5710.6.28.0/2510.6.28.1 – 10.6.28.12610.6.28.127
5810.6.28.128/2510.6.28.129 – 10.6.28.25410.6.28.255
5910.6.29.0/2510.6.29.1 – 10.6.29.12610.6.29.127
6010.6.29.128/2510.6.29.129 – 10.6.29.25410.6.29.255
6110.6.30.0/2510.6.30.1 – 10.6.30.12610.6.30.127
6210.6.30.128/2510.6.30.129 – 10.6.30.25410.6.30.255
6310.6.31.0/2510.6.31.1 – 10.6.31.12610.6.31.127
6410.6.31.128/2510.6.31.129 – 10.6.31.25410.6.31.255
6510.6.32.0/2510.6.32.1 – 10.6.32.12610.6.32.127
6610.6.32.128/2510.6.32.129 – 10.6.32.25410.6.32.255
6710.6.33.0/2510.6.33.1 – 10.6.33.12610.6.33.127
6810.6.33.128/2510.6.33.129 – 10.6.33.25410.6.33.255
6910.6.34.0/2510.6.34.1 – 10.6.34.12610.6.34.127
7010.6.34.128/2510.6.34.129 – 10.6.34.25410.6.34.255
7110.6.35.0/2510.6.35.1 – 10.6.35.12610.6.35.127
7210.6.35.128/2510.6.35.129 – 10.6.35.25410.6.35.255
7310.6.36.0/2510.6.36.1 – 10.6.36.12610.6.36.127
7410.6.36.128/2510.6.36.129 – 10.6.36.25410.6.36.255
7510.6.37.0/2510.6.37.1 – 10.6.37.12610.6.37.127
7610.6.37.128/2510.6.37.129 – 10.6.37.25410.6.37.255
7710.6.38.0/2510.6.38.1 – 10.6.38.12610.6.38.127
7810.6.38.128/2510.6.38.129 – 10.6.38.25410.6.38.255
7910.6.39.0/2510.6.39.1 – 10.6.39.12610.6.39.127
8010.6.39.128/2510.6.39.129 – 10.6.39.25410.6.39.255
8110.6.40.0/2510.6.40.1 – 10.6.40.12610.6.40.127
8210.6.40.128/2510.6.40.129 – 10.6.40.25410.6.40.255
8310.6.41.0/2510.6.41.1 – 10.6.41.12610.6.41.127
8410.6.41.128/2510.6.41.129 – 10.6.41.25410.6.41.255
8510.6.42.0/2510.6.42.1 – 10.6.42.12610.6.42.127
8610.6.42.128/2510.6.42.129 – 10.6.42.25410.6.42.255
8710.6.43.0/2510.6.43.1 – 10.6.43.12610.6.43.127
8810.6.43.128/2510.6.43.129 – 10.6.43.25410.6.43.255
8910.6.44.0/2510.6.44.1 – 10.6.44.12610.6.44.127
9010.6.44.128/2510.6.44.129 – 10.6.44.25410.6.44.255
9110.6.45.0/2510.6.45.1 – 10.6.45.12610.6.45.127
9210.6.45.128/2510.6.45.129 – 10.6.45.25410.6.45.255
9310.6.46.0/2510.6.46.1 – 10.6.46.12610.6.46.127
9410.6.46.128/2510.6.46.129 – 10.6.46.25410.6.46.255
9510.6.47.0/2510.6.47.1 – 10.6.47.12610.6.47.127
9610.6.47.128/2510.6.47.129 – 10.6.47.25410.6.47.255
9710.6.48.0/2510.6.48.1 – 10.6.48.12610.6.48.127
9810.6.48.128/2510.6.48.129 – 10.6.48.25410.6.48.255
9910.6.49.0/2510.6.49.1 – 10.6.49.12610.6.49.127
10010.6.49.128/2510.6.49.129 – 10.6.49.25410.6.49.255
10110.6.50.0/2510.6.50.1 – 10.6.50.12610.6.50.127
10210.6.50.128/2510.6.50.129 – 10.6.50.25410.6.50.255
10310.6.51.0/2510.6.51.1 – 10.6.51.12610.6.51.127
10410.6.51.128/2510.6.51.129 – 10.6.51.25410.6.51.255
10510.6.52.0/2510.6.52.1 – 10.6.52.12610.6.52.127
10610.6.52.128/2510.6.52.129 – 10.6.52.25410.6.52.255
10710.6.53.0/2510.6.53.1 – 10.6.53.12610.6.53.127
10810.6.53.128/2510.6.53.129 – 10.6.53.25410.6.53.255
10910.6.54.0/2510.6.54.1 – 10.6.54.12610.6.54.127
11010.6.54.128/2510.6.54.129 – 10.6.54.25410.6.54.255
11110.6.55.0/2510.6.55.1 – 10.6.55.12610.6.55.127
11210.6.55.128/2510.6.55.129 – 10.6.55.25410.6.55.255
11310.6.56.0/2510.6.56.1 – 10.6.56.12610.6.56.127
11410.6.56.128/2510.6.56.129 – 10.6.56.25410.6.56.255
11510.6.57.0/2510.6.57.1 – 10.6.57.12610.6.57.127
11610.6.57.128/2510.6.57.129 – 10.6.57.25410.6.57.255
11710.6.58.0/2510.6.58.1 – 10.6.58.12610.6.58.127
11810.6.58.128/2510.6.58.129 – 10.6.58.25410.6.58.255
11910.6.59.0/2510.6.59.1 – 10.6.59.12610.6.59.127
12010.6.59.128/2510.6.59.129 – 10.6.59.25410.6.59.255
12110.6.60.0/2510.6.60.1 – 10.6.60.12610.6.60.127
12210.6.60.128/2510.6.60.129 – 10.6.60.25410.6.60.255
12310.6.61.0/2510.6.61.1 – 10.6.61.12610.6.61.127
12410.6.61.128/2510.6.61.129 – 10.6.61.25410.6.61.255
12510.6.62.0/2510.6.62.1 – 10.6.62.12610.6.62.127
12610.6.62.128/2510.6.62.129 – 10.6.62.25410.6.62.255
12710.6.63.0/2510.6.63.1 – 10.6.63.12610.6.63.127
12810.6.63.128/2510.6.63.129 – 10.6.63.25410.6.63.255
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 →