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)10.5.0.0/18
network10.5.0.0/18
broadcast10.5.63.255
first host10.5.0.1
last host10.5.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.5.0.0/18
address00001010.00000101.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00000101.00000000.00000000
broadcast00001010.00000101.00111111.11111111
green = network part, grey = host part
hex0x0a050000
decimal168099840
reverse dns0.0.5.10.in-addr.arpa
ipv4-mapped::ffff:a05:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.5.0.0/2510.5.0.1 – 10.5.0.12610.5.0.127
210.5.0.128/2510.5.0.129 – 10.5.0.25410.5.0.255
310.5.1.0/2510.5.1.1 – 10.5.1.12610.5.1.127
410.5.1.128/2510.5.1.129 – 10.5.1.25410.5.1.255
510.5.2.0/2510.5.2.1 – 10.5.2.12610.5.2.127
610.5.2.128/2510.5.2.129 – 10.5.2.25410.5.2.255
710.5.3.0/2510.5.3.1 – 10.5.3.12610.5.3.127
810.5.3.128/2510.5.3.129 – 10.5.3.25410.5.3.255
910.5.4.0/2510.5.4.1 – 10.5.4.12610.5.4.127
1010.5.4.128/2510.5.4.129 – 10.5.4.25410.5.4.255
1110.5.5.0/2510.5.5.1 – 10.5.5.12610.5.5.127
1210.5.5.128/2510.5.5.129 – 10.5.5.25410.5.5.255
1310.5.6.0/2510.5.6.1 – 10.5.6.12610.5.6.127
1410.5.6.128/2510.5.6.129 – 10.5.6.25410.5.6.255
1510.5.7.0/2510.5.7.1 – 10.5.7.12610.5.7.127
1610.5.7.128/2510.5.7.129 – 10.5.7.25410.5.7.255
1710.5.8.0/2510.5.8.1 – 10.5.8.12610.5.8.127
1810.5.8.128/2510.5.8.129 – 10.5.8.25410.5.8.255
1910.5.9.0/2510.5.9.1 – 10.5.9.12610.5.9.127
2010.5.9.128/2510.5.9.129 – 10.5.9.25410.5.9.255
2110.5.10.0/2510.5.10.1 – 10.5.10.12610.5.10.127
2210.5.10.128/2510.5.10.129 – 10.5.10.25410.5.10.255
2310.5.11.0/2510.5.11.1 – 10.5.11.12610.5.11.127
2410.5.11.128/2510.5.11.129 – 10.5.11.25410.5.11.255
2510.5.12.0/2510.5.12.1 – 10.5.12.12610.5.12.127
2610.5.12.128/2510.5.12.129 – 10.5.12.25410.5.12.255
2710.5.13.0/2510.5.13.1 – 10.5.13.12610.5.13.127
2810.5.13.128/2510.5.13.129 – 10.5.13.25410.5.13.255
2910.5.14.0/2510.5.14.1 – 10.5.14.12610.5.14.127
3010.5.14.128/2510.5.14.129 – 10.5.14.25410.5.14.255
3110.5.15.0/2510.5.15.1 – 10.5.15.12610.5.15.127
3210.5.15.128/2510.5.15.129 – 10.5.15.25410.5.15.255
3310.5.16.0/2510.5.16.1 – 10.5.16.12610.5.16.127
3410.5.16.128/2510.5.16.129 – 10.5.16.25410.5.16.255
3510.5.17.0/2510.5.17.1 – 10.5.17.12610.5.17.127
3610.5.17.128/2510.5.17.129 – 10.5.17.25410.5.17.255
3710.5.18.0/2510.5.18.1 – 10.5.18.12610.5.18.127
3810.5.18.128/2510.5.18.129 – 10.5.18.25410.5.18.255
3910.5.19.0/2510.5.19.1 – 10.5.19.12610.5.19.127
4010.5.19.128/2510.5.19.129 – 10.5.19.25410.5.19.255
4110.5.20.0/2510.5.20.1 – 10.5.20.12610.5.20.127
4210.5.20.128/2510.5.20.129 – 10.5.20.25410.5.20.255
4310.5.21.0/2510.5.21.1 – 10.5.21.12610.5.21.127
4410.5.21.128/2510.5.21.129 – 10.5.21.25410.5.21.255
4510.5.22.0/2510.5.22.1 – 10.5.22.12610.5.22.127
4610.5.22.128/2510.5.22.129 – 10.5.22.25410.5.22.255
4710.5.23.0/2510.5.23.1 – 10.5.23.12610.5.23.127
4810.5.23.128/2510.5.23.129 – 10.5.23.25410.5.23.255
4910.5.24.0/2510.5.24.1 – 10.5.24.12610.5.24.127
5010.5.24.128/2510.5.24.129 – 10.5.24.25410.5.24.255
5110.5.25.0/2510.5.25.1 – 10.5.25.12610.5.25.127
5210.5.25.128/2510.5.25.129 – 10.5.25.25410.5.25.255
5310.5.26.0/2510.5.26.1 – 10.5.26.12610.5.26.127
5410.5.26.128/2510.5.26.129 – 10.5.26.25410.5.26.255
5510.5.27.0/2510.5.27.1 – 10.5.27.12610.5.27.127
5610.5.27.128/2510.5.27.129 – 10.5.27.25410.5.27.255
5710.5.28.0/2510.5.28.1 – 10.5.28.12610.5.28.127
5810.5.28.128/2510.5.28.129 – 10.5.28.25410.5.28.255
5910.5.29.0/2510.5.29.1 – 10.5.29.12610.5.29.127
6010.5.29.128/2510.5.29.129 – 10.5.29.25410.5.29.255
6110.5.30.0/2510.5.30.1 – 10.5.30.12610.5.30.127
6210.5.30.128/2510.5.30.129 – 10.5.30.25410.5.30.255
6310.5.31.0/2510.5.31.1 – 10.5.31.12610.5.31.127
6410.5.31.128/2510.5.31.129 – 10.5.31.25410.5.31.255
6510.5.32.0/2510.5.32.1 – 10.5.32.12610.5.32.127
6610.5.32.128/2510.5.32.129 – 10.5.32.25410.5.32.255
6710.5.33.0/2510.5.33.1 – 10.5.33.12610.5.33.127
6810.5.33.128/2510.5.33.129 – 10.5.33.25410.5.33.255
6910.5.34.0/2510.5.34.1 – 10.5.34.12610.5.34.127
7010.5.34.128/2510.5.34.129 – 10.5.34.25410.5.34.255
7110.5.35.0/2510.5.35.1 – 10.5.35.12610.5.35.127
7210.5.35.128/2510.5.35.129 – 10.5.35.25410.5.35.255
7310.5.36.0/2510.5.36.1 – 10.5.36.12610.5.36.127
7410.5.36.128/2510.5.36.129 – 10.5.36.25410.5.36.255
7510.5.37.0/2510.5.37.1 – 10.5.37.12610.5.37.127
7610.5.37.128/2510.5.37.129 – 10.5.37.25410.5.37.255
7710.5.38.0/2510.5.38.1 – 10.5.38.12610.5.38.127
7810.5.38.128/2510.5.38.129 – 10.5.38.25410.5.38.255
7910.5.39.0/2510.5.39.1 – 10.5.39.12610.5.39.127
8010.5.39.128/2510.5.39.129 – 10.5.39.25410.5.39.255
8110.5.40.0/2510.5.40.1 – 10.5.40.12610.5.40.127
8210.5.40.128/2510.5.40.129 – 10.5.40.25410.5.40.255
8310.5.41.0/2510.5.41.1 – 10.5.41.12610.5.41.127
8410.5.41.128/2510.5.41.129 – 10.5.41.25410.5.41.255
8510.5.42.0/2510.5.42.1 – 10.5.42.12610.5.42.127
8610.5.42.128/2510.5.42.129 – 10.5.42.25410.5.42.255
8710.5.43.0/2510.5.43.1 – 10.5.43.12610.5.43.127
8810.5.43.128/2510.5.43.129 – 10.5.43.25410.5.43.255
8910.5.44.0/2510.5.44.1 – 10.5.44.12610.5.44.127
9010.5.44.128/2510.5.44.129 – 10.5.44.25410.5.44.255
9110.5.45.0/2510.5.45.1 – 10.5.45.12610.5.45.127
9210.5.45.128/2510.5.45.129 – 10.5.45.25410.5.45.255
9310.5.46.0/2510.5.46.1 – 10.5.46.12610.5.46.127
9410.5.46.128/2510.5.46.129 – 10.5.46.25410.5.46.255
9510.5.47.0/2510.5.47.1 – 10.5.47.12610.5.47.127
9610.5.47.128/2510.5.47.129 – 10.5.47.25410.5.47.255
9710.5.48.0/2510.5.48.1 – 10.5.48.12610.5.48.127
9810.5.48.128/2510.5.48.129 – 10.5.48.25410.5.48.255
9910.5.49.0/2510.5.49.1 – 10.5.49.12610.5.49.127
10010.5.49.128/2510.5.49.129 – 10.5.49.25410.5.49.255
10110.5.50.0/2510.5.50.1 – 10.5.50.12610.5.50.127
10210.5.50.128/2510.5.50.129 – 10.5.50.25410.5.50.255
10310.5.51.0/2510.5.51.1 – 10.5.51.12610.5.51.127
10410.5.51.128/2510.5.51.129 – 10.5.51.25410.5.51.255
10510.5.52.0/2510.5.52.1 – 10.5.52.12610.5.52.127
10610.5.52.128/2510.5.52.129 – 10.5.52.25410.5.52.255
10710.5.53.0/2510.5.53.1 – 10.5.53.12610.5.53.127
10810.5.53.128/2510.5.53.129 – 10.5.53.25410.5.53.255
10910.5.54.0/2510.5.54.1 – 10.5.54.12610.5.54.127
11010.5.54.128/2510.5.54.129 – 10.5.54.25410.5.54.255
11110.5.55.0/2510.5.55.1 – 10.5.55.12610.5.55.127
11210.5.55.128/2510.5.55.129 – 10.5.55.25410.5.55.255
11310.5.56.0/2510.5.56.1 – 10.5.56.12610.5.56.127
11410.5.56.128/2510.5.56.129 – 10.5.56.25410.5.56.255
11510.5.57.0/2510.5.57.1 – 10.5.57.12610.5.57.127
11610.5.57.128/2510.5.57.129 – 10.5.57.25410.5.57.255
11710.5.58.0/2510.5.58.1 – 10.5.58.12610.5.58.127
11810.5.58.128/2510.5.58.129 – 10.5.58.25410.5.58.255
11910.5.59.0/2510.5.59.1 – 10.5.59.12610.5.59.127
12010.5.59.128/2510.5.59.129 – 10.5.59.25410.5.59.255
12110.5.60.0/2510.5.60.1 – 10.5.60.12610.5.60.127
12210.5.60.128/2510.5.60.129 – 10.5.60.25410.5.60.255
12310.5.61.0/2510.5.61.1 – 10.5.61.12610.5.61.127
12410.5.61.128/2510.5.61.129 – 10.5.61.25410.5.61.255
12510.5.62.0/2510.5.62.1 – 10.5.62.12610.5.62.127
12610.5.62.128/2510.5.62.129 – 10.5.62.25410.5.62.255
12710.5.63.0/2510.5.63.1 – 10.5.63.12610.5.63.127
12810.5.63.128/2510.5.63.129 – 10.5.63.25410.5.63.255
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 →