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)10.4.0.0/18
network10.4.0.0/18
broadcast10.4.63.255
first host10.4.0.1
last host10.4.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.4.0.0/18
address00001010.00000100.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000100.00000000.00000000
broadcast00001010.00000100.00111111.11111111
green = network part, grey = host part
hex0x0a040000
decimal168034304
reverse dns0.0.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.4.0.0/2510.4.0.1 – 10.4.0.12610.4.0.127
210.4.0.128/2510.4.0.129 – 10.4.0.25410.4.0.255
310.4.1.0/2510.4.1.1 – 10.4.1.12610.4.1.127
410.4.1.128/2510.4.1.129 – 10.4.1.25410.4.1.255
510.4.2.0/2510.4.2.1 – 10.4.2.12610.4.2.127
610.4.2.128/2510.4.2.129 – 10.4.2.25410.4.2.255
710.4.3.0/2510.4.3.1 – 10.4.3.12610.4.3.127
810.4.3.128/2510.4.3.129 – 10.4.3.25410.4.3.255
910.4.4.0/2510.4.4.1 – 10.4.4.12610.4.4.127
1010.4.4.128/2510.4.4.129 – 10.4.4.25410.4.4.255
1110.4.5.0/2510.4.5.1 – 10.4.5.12610.4.5.127
1210.4.5.128/2510.4.5.129 – 10.4.5.25410.4.5.255
1310.4.6.0/2510.4.6.1 – 10.4.6.12610.4.6.127
1410.4.6.128/2510.4.6.129 – 10.4.6.25410.4.6.255
1510.4.7.0/2510.4.7.1 – 10.4.7.12610.4.7.127
1610.4.7.128/2510.4.7.129 – 10.4.7.25410.4.7.255
1710.4.8.0/2510.4.8.1 – 10.4.8.12610.4.8.127
1810.4.8.128/2510.4.8.129 – 10.4.8.25410.4.8.255
1910.4.9.0/2510.4.9.1 – 10.4.9.12610.4.9.127
2010.4.9.128/2510.4.9.129 – 10.4.9.25410.4.9.255
2110.4.10.0/2510.4.10.1 – 10.4.10.12610.4.10.127
2210.4.10.128/2510.4.10.129 – 10.4.10.25410.4.10.255
2310.4.11.0/2510.4.11.1 – 10.4.11.12610.4.11.127
2410.4.11.128/2510.4.11.129 – 10.4.11.25410.4.11.255
2510.4.12.0/2510.4.12.1 – 10.4.12.12610.4.12.127
2610.4.12.128/2510.4.12.129 – 10.4.12.25410.4.12.255
2710.4.13.0/2510.4.13.1 – 10.4.13.12610.4.13.127
2810.4.13.128/2510.4.13.129 – 10.4.13.25410.4.13.255
2910.4.14.0/2510.4.14.1 – 10.4.14.12610.4.14.127
3010.4.14.128/2510.4.14.129 – 10.4.14.25410.4.14.255
3110.4.15.0/2510.4.15.1 – 10.4.15.12610.4.15.127
3210.4.15.128/2510.4.15.129 – 10.4.15.25410.4.15.255
3310.4.16.0/2510.4.16.1 – 10.4.16.12610.4.16.127
3410.4.16.128/2510.4.16.129 – 10.4.16.25410.4.16.255
3510.4.17.0/2510.4.17.1 – 10.4.17.12610.4.17.127
3610.4.17.128/2510.4.17.129 – 10.4.17.25410.4.17.255
3710.4.18.0/2510.4.18.1 – 10.4.18.12610.4.18.127
3810.4.18.128/2510.4.18.129 – 10.4.18.25410.4.18.255
3910.4.19.0/2510.4.19.1 – 10.4.19.12610.4.19.127
4010.4.19.128/2510.4.19.129 – 10.4.19.25410.4.19.255
4110.4.20.0/2510.4.20.1 – 10.4.20.12610.4.20.127
4210.4.20.128/2510.4.20.129 – 10.4.20.25410.4.20.255
4310.4.21.0/2510.4.21.1 – 10.4.21.12610.4.21.127
4410.4.21.128/2510.4.21.129 – 10.4.21.25410.4.21.255
4510.4.22.0/2510.4.22.1 – 10.4.22.12610.4.22.127
4610.4.22.128/2510.4.22.129 – 10.4.22.25410.4.22.255
4710.4.23.0/2510.4.23.1 – 10.4.23.12610.4.23.127
4810.4.23.128/2510.4.23.129 – 10.4.23.25410.4.23.255
4910.4.24.0/2510.4.24.1 – 10.4.24.12610.4.24.127
5010.4.24.128/2510.4.24.129 – 10.4.24.25410.4.24.255
5110.4.25.0/2510.4.25.1 – 10.4.25.12610.4.25.127
5210.4.25.128/2510.4.25.129 – 10.4.25.25410.4.25.255
5310.4.26.0/2510.4.26.1 – 10.4.26.12610.4.26.127
5410.4.26.128/2510.4.26.129 – 10.4.26.25410.4.26.255
5510.4.27.0/2510.4.27.1 – 10.4.27.12610.4.27.127
5610.4.27.128/2510.4.27.129 – 10.4.27.25410.4.27.255
5710.4.28.0/2510.4.28.1 – 10.4.28.12610.4.28.127
5810.4.28.128/2510.4.28.129 – 10.4.28.25410.4.28.255
5910.4.29.0/2510.4.29.1 – 10.4.29.12610.4.29.127
6010.4.29.128/2510.4.29.129 – 10.4.29.25410.4.29.255
6110.4.30.0/2510.4.30.1 – 10.4.30.12610.4.30.127
6210.4.30.128/2510.4.30.129 – 10.4.30.25410.4.30.255
6310.4.31.0/2510.4.31.1 – 10.4.31.12610.4.31.127
6410.4.31.128/2510.4.31.129 – 10.4.31.25410.4.31.255
6510.4.32.0/2510.4.32.1 – 10.4.32.12610.4.32.127
6610.4.32.128/2510.4.32.129 – 10.4.32.25410.4.32.255
6710.4.33.0/2510.4.33.1 – 10.4.33.12610.4.33.127
6810.4.33.128/2510.4.33.129 – 10.4.33.25410.4.33.255
6910.4.34.0/2510.4.34.1 – 10.4.34.12610.4.34.127
7010.4.34.128/2510.4.34.129 – 10.4.34.25410.4.34.255
7110.4.35.0/2510.4.35.1 – 10.4.35.12610.4.35.127
7210.4.35.128/2510.4.35.129 – 10.4.35.25410.4.35.255
7310.4.36.0/2510.4.36.1 – 10.4.36.12610.4.36.127
7410.4.36.128/2510.4.36.129 – 10.4.36.25410.4.36.255
7510.4.37.0/2510.4.37.1 – 10.4.37.12610.4.37.127
7610.4.37.128/2510.4.37.129 – 10.4.37.25410.4.37.255
7710.4.38.0/2510.4.38.1 – 10.4.38.12610.4.38.127
7810.4.38.128/2510.4.38.129 – 10.4.38.25410.4.38.255
7910.4.39.0/2510.4.39.1 – 10.4.39.12610.4.39.127
8010.4.39.128/2510.4.39.129 – 10.4.39.25410.4.39.255
8110.4.40.0/2510.4.40.1 – 10.4.40.12610.4.40.127
8210.4.40.128/2510.4.40.129 – 10.4.40.25410.4.40.255
8310.4.41.0/2510.4.41.1 – 10.4.41.12610.4.41.127
8410.4.41.128/2510.4.41.129 – 10.4.41.25410.4.41.255
8510.4.42.0/2510.4.42.1 – 10.4.42.12610.4.42.127
8610.4.42.128/2510.4.42.129 – 10.4.42.25410.4.42.255
8710.4.43.0/2510.4.43.1 – 10.4.43.12610.4.43.127
8810.4.43.128/2510.4.43.129 – 10.4.43.25410.4.43.255
8910.4.44.0/2510.4.44.1 – 10.4.44.12610.4.44.127
9010.4.44.128/2510.4.44.129 – 10.4.44.25410.4.44.255
9110.4.45.0/2510.4.45.1 – 10.4.45.12610.4.45.127
9210.4.45.128/2510.4.45.129 – 10.4.45.25410.4.45.255
9310.4.46.0/2510.4.46.1 – 10.4.46.12610.4.46.127
9410.4.46.128/2510.4.46.129 – 10.4.46.25410.4.46.255
9510.4.47.0/2510.4.47.1 – 10.4.47.12610.4.47.127
9610.4.47.128/2510.4.47.129 – 10.4.47.25410.4.47.255
9710.4.48.0/2510.4.48.1 – 10.4.48.12610.4.48.127
9810.4.48.128/2510.4.48.129 – 10.4.48.25410.4.48.255
9910.4.49.0/2510.4.49.1 – 10.4.49.12610.4.49.127
10010.4.49.128/2510.4.49.129 – 10.4.49.25410.4.49.255
10110.4.50.0/2510.4.50.1 – 10.4.50.12610.4.50.127
10210.4.50.128/2510.4.50.129 – 10.4.50.25410.4.50.255
10310.4.51.0/2510.4.51.1 – 10.4.51.12610.4.51.127
10410.4.51.128/2510.4.51.129 – 10.4.51.25410.4.51.255
10510.4.52.0/2510.4.52.1 – 10.4.52.12610.4.52.127
10610.4.52.128/2510.4.52.129 – 10.4.52.25410.4.52.255
10710.4.53.0/2510.4.53.1 – 10.4.53.12610.4.53.127
10810.4.53.128/2510.4.53.129 – 10.4.53.25410.4.53.255
10910.4.54.0/2510.4.54.1 – 10.4.54.12610.4.54.127
11010.4.54.128/2510.4.54.129 – 10.4.54.25410.4.54.255
11110.4.55.0/2510.4.55.1 – 10.4.55.12610.4.55.127
11210.4.55.128/2510.4.55.129 – 10.4.55.25410.4.55.255
11310.4.56.0/2510.4.56.1 – 10.4.56.12610.4.56.127
11410.4.56.128/2510.4.56.129 – 10.4.56.25410.4.56.255
11510.4.57.0/2510.4.57.1 – 10.4.57.12610.4.57.127
11610.4.57.128/2510.4.57.129 – 10.4.57.25410.4.57.255
11710.4.58.0/2510.4.58.1 – 10.4.58.12610.4.58.127
11810.4.58.128/2510.4.58.129 – 10.4.58.25410.4.58.255
11910.4.59.0/2510.4.59.1 – 10.4.59.12610.4.59.127
12010.4.59.128/2510.4.59.129 – 10.4.59.25410.4.59.255
12110.4.60.0/2510.4.60.1 – 10.4.60.12610.4.60.127
12210.4.60.128/2510.4.60.129 – 10.4.60.25410.4.60.255
12310.4.61.0/2510.4.61.1 – 10.4.61.12610.4.61.127
12410.4.61.128/2510.4.61.129 – 10.4.61.25410.4.61.255
12510.4.62.0/2510.4.62.1 – 10.4.62.12610.4.62.127
12610.4.62.128/2510.4.62.129 – 10.4.62.25410.4.62.255
12710.4.63.0/2510.4.63.1 – 10.4.63.12610.4.63.127
12810.4.63.128/2510.4.63.129 – 10.4.63.25410.4.63.255
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 →