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)10.56.0.0/18
network10.56.0.0/18
broadcast10.56.63.255
first host10.56.0.1
last host10.56.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.56.0.0/18
address00001010.00111000.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00111000.00000000.00000000
broadcast00001010.00111000.00111111.11111111
green = network part, grey = host part
hex0x0a380000
decimal171442176
reverse dns0.0.56.10.in-addr.arpa
ipv4-mapped::ffff:a38:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.56.0.0/2510.56.0.1 – 10.56.0.12610.56.0.127
210.56.0.128/2510.56.0.129 – 10.56.0.25410.56.0.255
310.56.1.0/2510.56.1.1 – 10.56.1.12610.56.1.127
410.56.1.128/2510.56.1.129 – 10.56.1.25410.56.1.255
510.56.2.0/2510.56.2.1 – 10.56.2.12610.56.2.127
610.56.2.128/2510.56.2.129 – 10.56.2.25410.56.2.255
710.56.3.0/2510.56.3.1 – 10.56.3.12610.56.3.127
810.56.3.128/2510.56.3.129 – 10.56.3.25410.56.3.255
910.56.4.0/2510.56.4.1 – 10.56.4.12610.56.4.127
1010.56.4.128/2510.56.4.129 – 10.56.4.25410.56.4.255
1110.56.5.0/2510.56.5.1 – 10.56.5.12610.56.5.127
1210.56.5.128/2510.56.5.129 – 10.56.5.25410.56.5.255
1310.56.6.0/2510.56.6.1 – 10.56.6.12610.56.6.127
1410.56.6.128/2510.56.6.129 – 10.56.6.25410.56.6.255
1510.56.7.0/2510.56.7.1 – 10.56.7.12610.56.7.127
1610.56.7.128/2510.56.7.129 – 10.56.7.25410.56.7.255
1710.56.8.0/2510.56.8.1 – 10.56.8.12610.56.8.127
1810.56.8.128/2510.56.8.129 – 10.56.8.25410.56.8.255
1910.56.9.0/2510.56.9.1 – 10.56.9.12610.56.9.127
2010.56.9.128/2510.56.9.129 – 10.56.9.25410.56.9.255
2110.56.10.0/2510.56.10.1 – 10.56.10.12610.56.10.127
2210.56.10.128/2510.56.10.129 – 10.56.10.25410.56.10.255
2310.56.11.0/2510.56.11.1 – 10.56.11.12610.56.11.127
2410.56.11.128/2510.56.11.129 – 10.56.11.25410.56.11.255
2510.56.12.0/2510.56.12.1 – 10.56.12.12610.56.12.127
2610.56.12.128/2510.56.12.129 – 10.56.12.25410.56.12.255
2710.56.13.0/2510.56.13.1 – 10.56.13.12610.56.13.127
2810.56.13.128/2510.56.13.129 – 10.56.13.25410.56.13.255
2910.56.14.0/2510.56.14.1 – 10.56.14.12610.56.14.127
3010.56.14.128/2510.56.14.129 – 10.56.14.25410.56.14.255
3110.56.15.0/2510.56.15.1 – 10.56.15.12610.56.15.127
3210.56.15.128/2510.56.15.129 – 10.56.15.25410.56.15.255
3310.56.16.0/2510.56.16.1 – 10.56.16.12610.56.16.127
3410.56.16.128/2510.56.16.129 – 10.56.16.25410.56.16.255
3510.56.17.0/2510.56.17.1 – 10.56.17.12610.56.17.127
3610.56.17.128/2510.56.17.129 – 10.56.17.25410.56.17.255
3710.56.18.0/2510.56.18.1 – 10.56.18.12610.56.18.127
3810.56.18.128/2510.56.18.129 – 10.56.18.25410.56.18.255
3910.56.19.0/2510.56.19.1 – 10.56.19.12610.56.19.127
4010.56.19.128/2510.56.19.129 – 10.56.19.25410.56.19.255
4110.56.20.0/2510.56.20.1 – 10.56.20.12610.56.20.127
4210.56.20.128/2510.56.20.129 – 10.56.20.25410.56.20.255
4310.56.21.0/2510.56.21.1 – 10.56.21.12610.56.21.127
4410.56.21.128/2510.56.21.129 – 10.56.21.25410.56.21.255
4510.56.22.0/2510.56.22.1 – 10.56.22.12610.56.22.127
4610.56.22.128/2510.56.22.129 – 10.56.22.25410.56.22.255
4710.56.23.0/2510.56.23.1 – 10.56.23.12610.56.23.127
4810.56.23.128/2510.56.23.129 – 10.56.23.25410.56.23.255
4910.56.24.0/2510.56.24.1 – 10.56.24.12610.56.24.127
5010.56.24.128/2510.56.24.129 – 10.56.24.25410.56.24.255
5110.56.25.0/2510.56.25.1 – 10.56.25.12610.56.25.127
5210.56.25.128/2510.56.25.129 – 10.56.25.25410.56.25.255
5310.56.26.0/2510.56.26.1 – 10.56.26.12610.56.26.127
5410.56.26.128/2510.56.26.129 – 10.56.26.25410.56.26.255
5510.56.27.0/2510.56.27.1 – 10.56.27.12610.56.27.127
5610.56.27.128/2510.56.27.129 – 10.56.27.25410.56.27.255
5710.56.28.0/2510.56.28.1 – 10.56.28.12610.56.28.127
5810.56.28.128/2510.56.28.129 – 10.56.28.25410.56.28.255
5910.56.29.0/2510.56.29.1 – 10.56.29.12610.56.29.127
6010.56.29.128/2510.56.29.129 – 10.56.29.25410.56.29.255
6110.56.30.0/2510.56.30.1 – 10.56.30.12610.56.30.127
6210.56.30.128/2510.56.30.129 – 10.56.30.25410.56.30.255
6310.56.31.0/2510.56.31.1 – 10.56.31.12610.56.31.127
6410.56.31.128/2510.56.31.129 – 10.56.31.25410.56.31.255
6510.56.32.0/2510.56.32.1 – 10.56.32.12610.56.32.127
6610.56.32.128/2510.56.32.129 – 10.56.32.25410.56.32.255
6710.56.33.0/2510.56.33.1 – 10.56.33.12610.56.33.127
6810.56.33.128/2510.56.33.129 – 10.56.33.25410.56.33.255
6910.56.34.0/2510.56.34.1 – 10.56.34.12610.56.34.127
7010.56.34.128/2510.56.34.129 – 10.56.34.25410.56.34.255
7110.56.35.0/2510.56.35.1 – 10.56.35.12610.56.35.127
7210.56.35.128/2510.56.35.129 – 10.56.35.25410.56.35.255
7310.56.36.0/2510.56.36.1 – 10.56.36.12610.56.36.127
7410.56.36.128/2510.56.36.129 – 10.56.36.25410.56.36.255
7510.56.37.0/2510.56.37.1 – 10.56.37.12610.56.37.127
7610.56.37.128/2510.56.37.129 – 10.56.37.25410.56.37.255
7710.56.38.0/2510.56.38.1 – 10.56.38.12610.56.38.127
7810.56.38.128/2510.56.38.129 – 10.56.38.25410.56.38.255
7910.56.39.0/2510.56.39.1 – 10.56.39.12610.56.39.127
8010.56.39.128/2510.56.39.129 – 10.56.39.25410.56.39.255
8110.56.40.0/2510.56.40.1 – 10.56.40.12610.56.40.127
8210.56.40.128/2510.56.40.129 – 10.56.40.25410.56.40.255
8310.56.41.0/2510.56.41.1 – 10.56.41.12610.56.41.127
8410.56.41.128/2510.56.41.129 – 10.56.41.25410.56.41.255
8510.56.42.0/2510.56.42.1 – 10.56.42.12610.56.42.127
8610.56.42.128/2510.56.42.129 – 10.56.42.25410.56.42.255
8710.56.43.0/2510.56.43.1 – 10.56.43.12610.56.43.127
8810.56.43.128/2510.56.43.129 – 10.56.43.25410.56.43.255
8910.56.44.0/2510.56.44.1 – 10.56.44.12610.56.44.127
9010.56.44.128/2510.56.44.129 – 10.56.44.25410.56.44.255
9110.56.45.0/2510.56.45.1 – 10.56.45.12610.56.45.127
9210.56.45.128/2510.56.45.129 – 10.56.45.25410.56.45.255
9310.56.46.0/2510.56.46.1 – 10.56.46.12610.56.46.127
9410.56.46.128/2510.56.46.129 – 10.56.46.25410.56.46.255
9510.56.47.0/2510.56.47.1 – 10.56.47.12610.56.47.127
9610.56.47.128/2510.56.47.129 – 10.56.47.25410.56.47.255
9710.56.48.0/2510.56.48.1 – 10.56.48.12610.56.48.127
9810.56.48.128/2510.56.48.129 – 10.56.48.25410.56.48.255
9910.56.49.0/2510.56.49.1 – 10.56.49.12610.56.49.127
10010.56.49.128/2510.56.49.129 – 10.56.49.25410.56.49.255
10110.56.50.0/2510.56.50.1 – 10.56.50.12610.56.50.127
10210.56.50.128/2510.56.50.129 – 10.56.50.25410.56.50.255
10310.56.51.0/2510.56.51.1 – 10.56.51.12610.56.51.127
10410.56.51.128/2510.56.51.129 – 10.56.51.25410.56.51.255
10510.56.52.0/2510.56.52.1 – 10.56.52.12610.56.52.127
10610.56.52.128/2510.56.52.129 – 10.56.52.25410.56.52.255
10710.56.53.0/2510.56.53.1 – 10.56.53.12610.56.53.127
10810.56.53.128/2510.56.53.129 – 10.56.53.25410.56.53.255
10910.56.54.0/2510.56.54.1 – 10.56.54.12610.56.54.127
11010.56.54.128/2510.56.54.129 – 10.56.54.25410.56.54.255
11110.56.55.0/2510.56.55.1 – 10.56.55.12610.56.55.127
11210.56.55.128/2510.56.55.129 – 10.56.55.25410.56.55.255
11310.56.56.0/2510.56.56.1 – 10.56.56.12610.56.56.127
11410.56.56.128/2510.56.56.129 – 10.56.56.25410.56.56.255
11510.56.57.0/2510.56.57.1 – 10.56.57.12610.56.57.127
11610.56.57.128/2510.56.57.129 – 10.56.57.25410.56.57.255
11710.56.58.0/2510.56.58.1 – 10.56.58.12610.56.58.127
11810.56.58.128/2510.56.58.129 – 10.56.58.25410.56.58.255
11910.56.59.0/2510.56.59.1 – 10.56.59.12610.56.59.127
12010.56.59.128/2510.56.59.129 – 10.56.59.25410.56.59.255
12110.56.60.0/2510.56.60.1 – 10.56.60.12610.56.60.127
12210.56.60.128/2510.56.60.129 – 10.56.60.25410.56.60.255
12310.56.61.0/2510.56.61.1 – 10.56.61.12610.56.61.127
12410.56.61.128/2510.56.61.129 – 10.56.61.25410.56.61.255
12510.56.62.0/2510.56.62.1 – 10.56.62.12610.56.62.127
12610.56.62.128/2510.56.62.129 – 10.56.62.25410.56.62.255
12710.56.63.0/2510.56.63.1 – 10.56.63.12610.56.63.127
12810.56.63.128/2510.56.63.129 – 10.56.63.25410.56.63.255
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 →