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)10.166.0.0/18
network10.166.0.0/18
broadcast10.166.63.255
first host10.166.0.1
last host10.166.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.166.0.0/18
address00001010.10100110.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.10100110.00000000.00000000
broadcast00001010.10100110.00111111.11111111
green = network part, grey = host part
hex0x0aa60000
decimal178651136
reverse dns0.0.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.166.0.0/2510.166.0.1 – 10.166.0.12610.166.0.127
210.166.0.128/2510.166.0.129 – 10.166.0.25410.166.0.255
310.166.1.0/2510.166.1.1 – 10.166.1.12610.166.1.127
410.166.1.128/2510.166.1.129 – 10.166.1.25410.166.1.255
510.166.2.0/2510.166.2.1 – 10.166.2.12610.166.2.127
610.166.2.128/2510.166.2.129 – 10.166.2.25410.166.2.255
710.166.3.0/2510.166.3.1 – 10.166.3.12610.166.3.127
810.166.3.128/2510.166.3.129 – 10.166.3.25410.166.3.255
910.166.4.0/2510.166.4.1 – 10.166.4.12610.166.4.127
1010.166.4.128/2510.166.4.129 – 10.166.4.25410.166.4.255
1110.166.5.0/2510.166.5.1 – 10.166.5.12610.166.5.127
1210.166.5.128/2510.166.5.129 – 10.166.5.25410.166.5.255
1310.166.6.0/2510.166.6.1 – 10.166.6.12610.166.6.127
1410.166.6.128/2510.166.6.129 – 10.166.6.25410.166.6.255
1510.166.7.0/2510.166.7.1 – 10.166.7.12610.166.7.127
1610.166.7.128/2510.166.7.129 – 10.166.7.25410.166.7.255
1710.166.8.0/2510.166.8.1 – 10.166.8.12610.166.8.127
1810.166.8.128/2510.166.8.129 – 10.166.8.25410.166.8.255
1910.166.9.0/2510.166.9.1 – 10.166.9.12610.166.9.127
2010.166.9.128/2510.166.9.129 – 10.166.9.25410.166.9.255
2110.166.10.0/2510.166.10.1 – 10.166.10.12610.166.10.127
2210.166.10.128/2510.166.10.129 – 10.166.10.25410.166.10.255
2310.166.11.0/2510.166.11.1 – 10.166.11.12610.166.11.127
2410.166.11.128/2510.166.11.129 – 10.166.11.25410.166.11.255
2510.166.12.0/2510.166.12.1 – 10.166.12.12610.166.12.127
2610.166.12.128/2510.166.12.129 – 10.166.12.25410.166.12.255
2710.166.13.0/2510.166.13.1 – 10.166.13.12610.166.13.127
2810.166.13.128/2510.166.13.129 – 10.166.13.25410.166.13.255
2910.166.14.0/2510.166.14.1 – 10.166.14.12610.166.14.127
3010.166.14.128/2510.166.14.129 – 10.166.14.25410.166.14.255
3110.166.15.0/2510.166.15.1 – 10.166.15.12610.166.15.127
3210.166.15.128/2510.166.15.129 – 10.166.15.25410.166.15.255
3310.166.16.0/2510.166.16.1 – 10.166.16.12610.166.16.127
3410.166.16.128/2510.166.16.129 – 10.166.16.25410.166.16.255
3510.166.17.0/2510.166.17.1 – 10.166.17.12610.166.17.127
3610.166.17.128/2510.166.17.129 – 10.166.17.25410.166.17.255
3710.166.18.0/2510.166.18.1 – 10.166.18.12610.166.18.127
3810.166.18.128/2510.166.18.129 – 10.166.18.25410.166.18.255
3910.166.19.0/2510.166.19.1 – 10.166.19.12610.166.19.127
4010.166.19.128/2510.166.19.129 – 10.166.19.25410.166.19.255
4110.166.20.0/2510.166.20.1 – 10.166.20.12610.166.20.127
4210.166.20.128/2510.166.20.129 – 10.166.20.25410.166.20.255
4310.166.21.0/2510.166.21.1 – 10.166.21.12610.166.21.127
4410.166.21.128/2510.166.21.129 – 10.166.21.25410.166.21.255
4510.166.22.0/2510.166.22.1 – 10.166.22.12610.166.22.127
4610.166.22.128/2510.166.22.129 – 10.166.22.25410.166.22.255
4710.166.23.0/2510.166.23.1 – 10.166.23.12610.166.23.127
4810.166.23.128/2510.166.23.129 – 10.166.23.25410.166.23.255
4910.166.24.0/2510.166.24.1 – 10.166.24.12610.166.24.127
5010.166.24.128/2510.166.24.129 – 10.166.24.25410.166.24.255
5110.166.25.0/2510.166.25.1 – 10.166.25.12610.166.25.127
5210.166.25.128/2510.166.25.129 – 10.166.25.25410.166.25.255
5310.166.26.0/2510.166.26.1 – 10.166.26.12610.166.26.127
5410.166.26.128/2510.166.26.129 – 10.166.26.25410.166.26.255
5510.166.27.0/2510.166.27.1 – 10.166.27.12610.166.27.127
5610.166.27.128/2510.166.27.129 – 10.166.27.25410.166.27.255
5710.166.28.0/2510.166.28.1 – 10.166.28.12610.166.28.127
5810.166.28.128/2510.166.28.129 – 10.166.28.25410.166.28.255
5910.166.29.0/2510.166.29.1 – 10.166.29.12610.166.29.127
6010.166.29.128/2510.166.29.129 – 10.166.29.25410.166.29.255
6110.166.30.0/2510.166.30.1 – 10.166.30.12610.166.30.127
6210.166.30.128/2510.166.30.129 – 10.166.30.25410.166.30.255
6310.166.31.0/2510.166.31.1 – 10.166.31.12610.166.31.127
6410.166.31.128/2510.166.31.129 – 10.166.31.25410.166.31.255
6510.166.32.0/2510.166.32.1 – 10.166.32.12610.166.32.127
6610.166.32.128/2510.166.32.129 – 10.166.32.25410.166.32.255
6710.166.33.0/2510.166.33.1 – 10.166.33.12610.166.33.127
6810.166.33.128/2510.166.33.129 – 10.166.33.25410.166.33.255
6910.166.34.0/2510.166.34.1 – 10.166.34.12610.166.34.127
7010.166.34.128/2510.166.34.129 – 10.166.34.25410.166.34.255
7110.166.35.0/2510.166.35.1 – 10.166.35.12610.166.35.127
7210.166.35.128/2510.166.35.129 – 10.166.35.25410.166.35.255
7310.166.36.0/2510.166.36.1 – 10.166.36.12610.166.36.127
7410.166.36.128/2510.166.36.129 – 10.166.36.25410.166.36.255
7510.166.37.0/2510.166.37.1 – 10.166.37.12610.166.37.127
7610.166.37.128/2510.166.37.129 – 10.166.37.25410.166.37.255
7710.166.38.0/2510.166.38.1 – 10.166.38.12610.166.38.127
7810.166.38.128/2510.166.38.129 – 10.166.38.25410.166.38.255
7910.166.39.0/2510.166.39.1 – 10.166.39.12610.166.39.127
8010.166.39.128/2510.166.39.129 – 10.166.39.25410.166.39.255
8110.166.40.0/2510.166.40.1 – 10.166.40.12610.166.40.127
8210.166.40.128/2510.166.40.129 – 10.166.40.25410.166.40.255
8310.166.41.0/2510.166.41.1 – 10.166.41.12610.166.41.127
8410.166.41.128/2510.166.41.129 – 10.166.41.25410.166.41.255
8510.166.42.0/2510.166.42.1 – 10.166.42.12610.166.42.127
8610.166.42.128/2510.166.42.129 – 10.166.42.25410.166.42.255
8710.166.43.0/2510.166.43.1 – 10.166.43.12610.166.43.127
8810.166.43.128/2510.166.43.129 – 10.166.43.25410.166.43.255
8910.166.44.0/2510.166.44.1 – 10.166.44.12610.166.44.127
9010.166.44.128/2510.166.44.129 – 10.166.44.25410.166.44.255
9110.166.45.0/2510.166.45.1 – 10.166.45.12610.166.45.127
9210.166.45.128/2510.166.45.129 – 10.166.45.25410.166.45.255
9310.166.46.0/2510.166.46.1 – 10.166.46.12610.166.46.127
9410.166.46.128/2510.166.46.129 – 10.166.46.25410.166.46.255
9510.166.47.0/2510.166.47.1 – 10.166.47.12610.166.47.127
9610.166.47.128/2510.166.47.129 – 10.166.47.25410.166.47.255
9710.166.48.0/2510.166.48.1 – 10.166.48.12610.166.48.127
9810.166.48.128/2510.166.48.129 – 10.166.48.25410.166.48.255
9910.166.49.0/2510.166.49.1 – 10.166.49.12610.166.49.127
10010.166.49.128/2510.166.49.129 – 10.166.49.25410.166.49.255
10110.166.50.0/2510.166.50.1 – 10.166.50.12610.166.50.127
10210.166.50.128/2510.166.50.129 – 10.166.50.25410.166.50.255
10310.166.51.0/2510.166.51.1 – 10.166.51.12610.166.51.127
10410.166.51.128/2510.166.51.129 – 10.166.51.25410.166.51.255
10510.166.52.0/2510.166.52.1 – 10.166.52.12610.166.52.127
10610.166.52.128/2510.166.52.129 – 10.166.52.25410.166.52.255
10710.166.53.0/2510.166.53.1 – 10.166.53.12610.166.53.127
10810.166.53.128/2510.166.53.129 – 10.166.53.25410.166.53.255
10910.166.54.0/2510.166.54.1 – 10.166.54.12610.166.54.127
11010.166.54.128/2510.166.54.129 – 10.166.54.25410.166.54.255
11110.166.55.0/2510.166.55.1 – 10.166.55.12610.166.55.127
11210.166.55.128/2510.166.55.129 – 10.166.55.25410.166.55.255
11310.166.56.0/2510.166.56.1 – 10.166.56.12610.166.56.127
11410.166.56.128/2510.166.56.129 – 10.166.56.25410.166.56.255
11510.166.57.0/2510.166.57.1 – 10.166.57.12610.166.57.127
11610.166.57.128/2510.166.57.129 – 10.166.57.25410.166.57.255
11710.166.58.0/2510.166.58.1 – 10.166.58.12610.166.58.127
11810.166.58.128/2510.166.58.129 – 10.166.58.25410.166.58.255
11910.166.59.0/2510.166.59.1 – 10.166.59.12610.166.59.127
12010.166.59.128/2510.166.59.129 – 10.166.59.25410.166.59.255
12110.166.60.0/2510.166.60.1 – 10.166.60.12610.166.60.127
12210.166.60.128/2510.166.60.129 – 10.166.60.25410.166.60.255
12310.166.61.0/2510.166.61.1 – 10.166.61.12610.166.61.127
12410.166.61.128/2510.166.61.129 – 10.166.61.25410.166.61.255
12510.166.62.0/2510.166.62.1 – 10.166.62.12610.166.62.127
12610.166.62.128/2510.166.62.129 – 10.166.62.25410.166.62.255
12710.166.63.0/2510.166.63.1 – 10.166.63.12610.166.63.127
12810.166.63.128/2510.166.63.129 – 10.166.63.25410.166.63.255
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 →