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)10.0.0.0/18
network10.0.0.0/18
broadcast10.0.63.255
first host10.0.0.1
last host10.0.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.0.0.0/18
address00001010.00000000.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.00000000.00111111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.0.0.0/2510.0.0.1 – 10.0.0.12610.0.0.127
210.0.0.128/2510.0.0.129 – 10.0.0.25410.0.0.255
310.0.1.0/2510.0.1.1 – 10.0.1.12610.0.1.127
410.0.1.128/2510.0.1.129 – 10.0.1.25410.0.1.255
510.0.2.0/2510.0.2.1 – 10.0.2.12610.0.2.127
610.0.2.128/2510.0.2.129 – 10.0.2.25410.0.2.255
710.0.3.0/2510.0.3.1 – 10.0.3.12610.0.3.127
810.0.3.128/2510.0.3.129 – 10.0.3.25410.0.3.255
910.0.4.0/2510.0.4.1 – 10.0.4.12610.0.4.127
1010.0.4.128/2510.0.4.129 – 10.0.4.25410.0.4.255
1110.0.5.0/2510.0.5.1 – 10.0.5.12610.0.5.127
1210.0.5.128/2510.0.5.129 – 10.0.5.25410.0.5.255
1310.0.6.0/2510.0.6.1 – 10.0.6.12610.0.6.127
1410.0.6.128/2510.0.6.129 – 10.0.6.25410.0.6.255
1510.0.7.0/2510.0.7.1 – 10.0.7.12610.0.7.127
1610.0.7.128/2510.0.7.129 – 10.0.7.25410.0.7.255
1710.0.8.0/2510.0.8.1 – 10.0.8.12610.0.8.127
1810.0.8.128/2510.0.8.129 – 10.0.8.25410.0.8.255
1910.0.9.0/2510.0.9.1 – 10.0.9.12610.0.9.127
2010.0.9.128/2510.0.9.129 – 10.0.9.25410.0.9.255
2110.0.10.0/2510.0.10.1 – 10.0.10.12610.0.10.127
2210.0.10.128/2510.0.10.129 – 10.0.10.25410.0.10.255
2310.0.11.0/2510.0.11.1 – 10.0.11.12610.0.11.127
2410.0.11.128/2510.0.11.129 – 10.0.11.25410.0.11.255
2510.0.12.0/2510.0.12.1 – 10.0.12.12610.0.12.127
2610.0.12.128/2510.0.12.129 – 10.0.12.25410.0.12.255
2710.0.13.0/2510.0.13.1 – 10.0.13.12610.0.13.127
2810.0.13.128/2510.0.13.129 – 10.0.13.25410.0.13.255
2910.0.14.0/2510.0.14.1 – 10.0.14.12610.0.14.127
3010.0.14.128/2510.0.14.129 – 10.0.14.25410.0.14.255
3110.0.15.0/2510.0.15.1 – 10.0.15.12610.0.15.127
3210.0.15.128/2510.0.15.129 – 10.0.15.25410.0.15.255
3310.0.16.0/2510.0.16.1 – 10.0.16.12610.0.16.127
3410.0.16.128/2510.0.16.129 – 10.0.16.25410.0.16.255
3510.0.17.0/2510.0.17.1 – 10.0.17.12610.0.17.127
3610.0.17.128/2510.0.17.129 – 10.0.17.25410.0.17.255
3710.0.18.0/2510.0.18.1 – 10.0.18.12610.0.18.127
3810.0.18.128/2510.0.18.129 – 10.0.18.25410.0.18.255
3910.0.19.0/2510.0.19.1 – 10.0.19.12610.0.19.127
4010.0.19.128/2510.0.19.129 – 10.0.19.25410.0.19.255
4110.0.20.0/2510.0.20.1 – 10.0.20.12610.0.20.127
4210.0.20.128/2510.0.20.129 – 10.0.20.25410.0.20.255
4310.0.21.0/2510.0.21.1 – 10.0.21.12610.0.21.127
4410.0.21.128/2510.0.21.129 – 10.0.21.25410.0.21.255
4510.0.22.0/2510.0.22.1 – 10.0.22.12610.0.22.127
4610.0.22.128/2510.0.22.129 – 10.0.22.25410.0.22.255
4710.0.23.0/2510.0.23.1 – 10.0.23.12610.0.23.127
4810.0.23.128/2510.0.23.129 – 10.0.23.25410.0.23.255
4910.0.24.0/2510.0.24.1 – 10.0.24.12610.0.24.127
5010.0.24.128/2510.0.24.129 – 10.0.24.25410.0.24.255
5110.0.25.0/2510.0.25.1 – 10.0.25.12610.0.25.127
5210.0.25.128/2510.0.25.129 – 10.0.25.25410.0.25.255
5310.0.26.0/2510.0.26.1 – 10.0.26.12610.0.26.127
5410.0.26.128/2510.0.26.129 – 10.0.26.25410.0.26.255
5510.0.27.0/2510.0.27.1 – 10.0.27.12610.0.27.127
5610.0.27.128/2510.0.27.129 – 10.0.27.25410.0.27.255
5710.0.28.0/2510.0.28.1 – 10.0.28.12610.0.28.127
5810.0.28.128/2510.0.28.129 – 10.0.28.25410.0.28.255
5910.0.29.0/2510.0.29.1 – 10.0.29.12610.0.29.127
6010.0.29.128/2510.0.29.129 – 10.0.29.25410.0.29.255
6110.0.30.0/2510.0.30.1 – 10.0.30.12610.0.30.127
6210.0.30.128/2510.0.30.129 – 10.0.30.25410.0.30.255
6310.0.31.0/2510.0.31.1 – 10.0.31.12610.0.31.127
6410.0.31.128/2510.0.31.129 – 10.0.31.25410.0.31.255
6510.0.32.0/2510.0.32.1 – 10.0.32.12610.0.32.127
6610.0.32.128/2510.0.32.129 – 10.0.32.25410.0.32.255
6710.0.33.0/2510.0.33.1 – 10.0.33.12610.0.33.127
6810.0.33.128/2510.0.33.129 – 10.0.33.25410.0.33.255
6910.0.34.0/2510.0.34.1 – 10.0.34.12610.0.34.127
7010.0.34.128/2510.0.34.129 – 10.0.34.25410.0.34.255
7110.0.35.0/2510.0.35.1 – 10.0.35.12610.0.35.127
7210.0.35.128/2510.0.35.129 – 10.0.35.25410.0.35.255
7310.0.36.0/2510.0.36.1 – 10.0.36.12610.0.36.127
7410.0.36.128/2510.0.36.129 – 10.0.36.25410.0.36.255
7510.0.37.0/2510.0.37.1 – 10.0.37.12610.0.37.127
7610.0.37.128/2510.0.37.129 – 10.0.37.25410.0.37.255
7710.0.38.0/2510.0.38.1 – 10.0.38.12610.0.38.127
7810.0.38.128/2510.0.38.129 – 10.0.38.25410.0.38.255
7910.0.39.0/2510.0.39.1 – 10.0.39.12610.0.39.127
8010.0.39.128/2510.0.39.129 – 10.0.39.25410.0.39.255
8110.0.40.0/2510.0.40.1 – 10.0.40.12610.0.40.127
8210.0.40.128/2510.0.40.129 – 10.0.40.25410.0.40.255
8310.0.41.0/2510.0.41.1 – 10.0.41.12610.0.41.127
8410.0.41.128/2510.0.41.129 – 10.0.41.25410.0.41.255
8510.0.42.0/2510.0.42.1 – 10.0.42.12610.0.42.127
8610.0.42.128/2510.0.42.129 – 10.0.42.25410.0.42.255
8710.0.43.0/2510.0.43.1 – 10.0.43.12610.0.43.127
8810.0.43.128/2510.0.43.129 – 10.0.43.25410.0.43.255
8910.0.44.0/2510.0.44.1 – 10.0.44.12610.0.44.127
9010.0.44.128/2510.0.44.129 – 10.0.44.25410.0.44.255
9110.0.45.0/2510.0.45.1 – 10.0.45.12610.0.45.127
9210.0.45.128/2510.0.45.129 – 10.0.45.25410.0.45.255
9310.0.46.0/2510.0.46.1 – 10.0.46.12610.0.46.127
9410.0.46.128/2510.0.46.129 – 10.0.46.25410.0.46.255
9510.0.47.0/2510.0.47.1 – 10.0.47.12610.0.47.127
9610.0.47.128/2510.0.47.129 – 10.0.47.25410.0.47.255
9710.0.48.0/2510.0.48.1 – 10.0.48.12610.0.48.127
9810.0.48.128/2510.0.48.129 – 10.0.48.25410.0.48.255
9910.0.49.0/2510.0.49.1 – 10.0.49.12610.0.49.127
10010.0.49.128/2510.0.49.129 – 10.0.49.25410.0.49.255
10110.0.50.0/2510.0.50.1 – 10.0.50.12610.0.50.127
10210.0.50.128/2510.0.50.129 – 10.0.50.25410.0.50.255
10310.0.51.0/2510.0.51.1 – 10.0.51.12610.0.51.127
10410.0.51.128/2510.0.51.129 – 10.0.51.25410.0.51.255
10510.0.52.0/2510.0.52.1 – 10.0.52.12610.0.52.127
10610.0.52.128/2510.0.52.129 – 10.0.52.25410.0.52.255
10710.0.53.0/2510.0.53.1 – 10.0.53.12610.0.53.127
10810.0.53.128/2510.0.53.129 – 10.0.53.25410.0.53.255
10910.0.54.0/2510.0.54.1 – 10.0.54.12610.0.54.127
11010.0.54.128/2510.0.54.129 – 10.0.54.25410.0.54.255
11110.0.55.0/2510.0.55.1 – 10.0.55.12610.0.55.127
11210.0.55.128/2510.0.55.129 – 10.0.55.25410.0.55.255
11310.0.56.0/2510.0.56.1 – 10.0.56.12610.0.56.127
11410.0.56.128/2510.0.56.129 – 10.0.56.25410.0.56.255
11510.0.57.0/2510.0.57.1 – 10.0.57.12610.0.57.127
11610.0.57.128/2510.0.57.129 – 10.0.57.25410.0.57.255
11710.0.58.0/2510.0.58.1 – 10.0.58.12610.0.58.127
11810.0.58.128/2510.0.58.129 – 10.0.58.25410.0.58.255
11910.0.59.0/2510.0.59.1 – 10.0.59.12610.0.59.127
12010.0.59.128/2510.0.59.129 – 10.0.59.25410.0.59.255
12110.0.60.0/2510.0.60.1 – 10.0.60.12610.0.60.127
12210.0.60.128/2510.0.60.129 – 10.0.60.25410.0.60.255
12310.0.61.0/2510.0.61.1 – 10.0.61.12610.0.61.127
12410.0.61.128/2510.0.61.129 – 10.0.61.25410.0.61.255
12510.0.62.0/2510.0.62.1 – 10.0.62.12610.0.62.127
12610.0.62.128/2510.0.62.129 – 10.0.62.25410.0.62.255
12710.0.63.0/2510.0.63.1 – 10.0.63.12610.0.63.127
12810.0.63.128/2510.0.63.129 – 10.0.63.25410.0.63.255
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 →