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)10.65.0.0/18
network10.65.0.0/18
broadcast10.65.63.255
first host10.65.0.1
last host10.65.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.65.0.0/18
address00001010.01000001.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.01000001.00000000.00000000
broadcast00001010.01000001.00111111.11111111
green = network part, grey = host part
hex0x0a410000
decimal172032000
reverse dns0.0.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.65.0.0/2510.65.0.1 – 10.65.0.12610.65.0.127
210.65.0.128/2510.65.0.129 – 10.65.0.25410.65.0.255
310.65.1.0/2510.65.1.1 – 10.65.1.12610.65.1.127
410.65.1.128/2510.65.1.129 – 10.65.1.25410.65.1.255
510.65.2.0/2510.65.2.1 – 10.65.2.12610.65.2.127
610.65.2.128/2510.65.2.129 – 10.65.2.25410.65.2.255
710.65.3.0/2510.65.3.1 – 10.65.3.12610.65.3.127
810.65.3.128/2510.65.3.129 – 10.65.3.25410.65.3.255
910.65.4.0/2510.65.4.1 – 10.65.4.12610.65.4.127
1010.65.4.128/2510.65.4.129 – 10.65.4.25410.65.4.255
1110.65.5.0/2510.65.5.1 – 10.65.5.12610.65.5.127
1210.65.5.128/2510.65.5.129 – 10.65.5.25410.65.5.255
1310.65.6.0/2510.65.6.1 – 10.65.6.12610.65.6.127
1410.65.6.128/2510.65.6.129 – 10.65.6.25410.65.6.255
1510.65.7.0/2510.65.7.1 – 10.65.7.12610.65.7.127
1610.65.7.128/2510.65.7.129 – 10.65.7.25410.65.7.255
1710.65.8.0/2510.65.8.1 – 10.65.8.12610.65.8.127
1810.65.8.128/2510.65.8.129 – 10.65.8.25410.65.8.255
1910.65.9.0/2510.65.9.1 – 10.65.9.12610.65.9.127
2010.65.9.128/2510.65.9.129 – 10.65.9.25410.65.9.255
2110.65.10.0/2510.65.10.1 – 10.65.10.12610.65.10.127
2210.65.10.128/2510.65.10.129 – 10.65.10.25410.65.10.255
2310.65.11.0/2510.65.11.1 – 10.65.11.12610.65.11.127
2410.65.11.128/2510.65.11.129 – 10.65.11.25410.65.11.255
2510.65.12.0/2510.65.12.1 – 10.65.12.12610.65.12.127
2610.65.12.128/2510.65.12.129 – 10.65.12.25410.65.12.255
2710.65.13.0/2510.65.13.1 – 10.65.13.12610.65.13.127
2810.65.13.128/2510.65.13.129 – 10.65.13.25410.65.13.255
2910.65.14.0/2510.65.14.1 – 10.65.14.12610.65.14.127
3010.65.14.128/2510.65.14.129 – 10.65.14.25410.65.14.255
3110.65.15.0/2510.65.15.1 – 10.65.15.12610.65.15.127
3210.65.15.128/2510.65.15.129 – 10.65.15.25410.65.15.255
3310.65.16.0/2510.65.16.1 – 10.65.16.12610.65.16.127
3410.65.16.128/2510.65.16.129 – 10.65.16.25410.65.16.255
3510.65.17.0/2510.65.17.1 – 10.65.17.12610.65.17.127
3610.65.17.128/2510.65.17.129 – 10.65.17.25410.65.17.255
3710.65.18.0/2510.65.18.1 – 10.65.18.12610.65.18.127
3810.65.18.128/2510.65.18.129 – 10.65.18.25410.65.18.255
3910.65.19.0/2510.65.19.1 – 10.65.19.12610.65.19.127
4010.65.19.128/2510.65.19.129 – 10.65.19.25410.65.19.255
4110.65.20.0/2510.65.20.1 – 10.65.20.12610.65.20.127
4210.65.20.128/2510.65.20.129 – 10.65.20.25410.65.20.255
4310.65.21.0/2510.65.21.1 – 10.65.21.12610.65.21.127
4410.65.21.128/2510.65.21.129 – 10.65.21.25410.65.21.255
4510.65.22.0/2510.65.22.1 – 10.65.22.12610.65.22.127
4610.65.22.128/2510.65.22.129 – 10.65.22.25410.65.22.255
4710.65.23.0/2510.65.23.1 – 10.65.23.12610.65.23.127
4810.65.23.128/2510.65.23.129 – 10.65.23.25410.65.23.255
4910.65.24.0/2510.65.24.1 – 10.65.24.12610.65.24.127
5010.65.24.128/2510.65.24.129 – 10.65.24.25410.65.24.255
5110.65.25.0/2510.65.25.1 – 10.65.25.12610.65.25.127
5210.65.25.128/2510.65.25.129 – 10.65.25.25410.65.25.255
5310.65.26.0/2510.65.26.1 – 10.65.26.12610.65.26.127
5410.65.26.128/2510.65.26.129 – 10.65.26.25410.65.26.255
5510.65.27.0/2510.65.27.1 – 10.65.27.12610.65.27.127
5610.65.27.128/2510.65.27.129 – 10.65.27.25410.65.27.255
5710.65.28.0/2510.65.28.1 – 10.65.28.12610.65.28.127
5810.65.28.128/2510.65.28.129 – 10.65.28.25410.65.28.255
5910.65.29.0/2510.65.29.1 – 10.65.29.12610.65.29.127
6010.65.29.128/2510.65.29.129 – 10.65.29.25410.65.29.255
6110.65.30.0/2510.65.30.1 – 10.65.30.12610.65.30.127
6210.65.30.128/2510.65.30.129 – 10.65.30.25410.65.30.255
6310.65.31.0/2510.65.31.1 – 10.65.31.12610.65.31.127
6410.65.31.128/2510.65.31.129 – 10.65.31.25410.65.31.255
6510.65.32.0/2510.65.32.1 – 10.65.32.12610.65.32.127
6610.65.32.128/2510.65.32.129 – 10.65.32.25410.65.32.255
6710.65.33.0/2510.65.33.1 – 10.65.33.12610.65.33.127
6810.65.33.128/2510.65.33.129 – 10.65.33.25410.65.33.255
6910.65.34.0/2510.65.34.1 – 10.65.34.12610.65.34.127
7010.65.34.128/2510.65.34.129 – 10.65.34.25410.65.34.255
7110.65.35.0/2510.65.35.1 – 10.65.35.12610.65.35.127
7210.65.35.128/2510.65.35.129 – 10.65.35.25410.65.35.255
7310.65.36.0/2510.65.36.1 – 10.65.36.12610.65.36.127
7410.65.36.128/2510.65.36.129 – 10.65.36.25410.65.36.255
7510.65.37.0/2510.65.37.1 – 10.65.37.12610.65.37.127
7610.65.37.128/2510.65.37.129 – 10.65.37.25410.65.37.255
7710.65.38.0/2510.65.38.1 – 10.65.38.12610.65.38.127
7810.65.38.128/2510.65.38.129 – 10.65.38.25410.65.38.255
7910.65.39.0/2510.65.39.1 – 10.65.39.12610.65.39.127
8010.65.39.128/2510.65.39.129 – 10.65.39.25410.65.39.255
8110.65.40.0/2510.65.40.1 – 10.65.40.12610.65.40.127
8210.65.40.128/2510.65.40.129 – 10.65.40.25410.65.40.255
8310.65.41.0/2510.65.41.1 – 10.65.41.12610.65.41.127
8410.65.41.128/2510.65.41.129 – 10.65.41.25410.65.41.255
8510.65.42.0/2510.65.42.1 – 10.65.42.12610.65.42.127
8610.65.42.128/2510.65.42.129 – 10.65.42.25410.65.42.255
8710.65.43.0/2510.65.43.1 – 10.65.43.12610.65.43.127
8810.65.43.128/2510.65.43.129 – 10.65.43.25410.65.43.255
8910.65.44.0/2510.65.44.1 – 10.65.44.12610.65.44.127
9010.65.44.128/2510.65.44.129 – 10.65.44.25410.65.44.255
9110.65.45.0/2510.65.45.1 – 10.65.45.12610.65.45.127
9210.65.45.128/2510.65.45.129 – 10.65.45.25410.65.45.255
9310.65.46.0/2510.65.46.1 – 10.65.46.12610.65.46.127
9410.65.46.128/2510.65.46.129 – 10.65.46.25410.65.46.255
9510.65.47.0/2510.65.47.1 – 10.65.47.12610.65.47.127
9610.65.47.128/2510.65.47.129 – 10.65.47.25410.65.47.255
9710.65.48.0/2510.65.48.1 – 10.65.48.12610.65.48.127
9810.65.48.128/2510.65.48.129 – 10.65.48.25410.65.48.255
9910.65.49.0/2510.65.49.1 – 10.65.49.12610.65.49.127
10010.65.49.128/2510.65.49.129 – 10.65.49.25410.65.49.255
10110.65.50.0/2510.65.50.1 – 10.65.50.12610.65.50.127
10210.65.50.128/2510.65.50.129 – 10.65.50.25410.65.50.255
10310.65.51.0/2510.65.51.1 – 10.65.51.12610.65.51.127
10410.65.51.128/2510.65.51.129 – 10.65.51.25410.65.51.255
10510.65.52.0/2510.65.52.1 – 10.65.52.12610.65.52.127
10610.65.52.128/2510.65.52.129 – 10.65.52.25410.65.52.255
10710.65.53.0/2510.65.53.1 – 10.65.53.12610.65.53.127
10810.65.53.128/2510.65.53.129 – 10.65.53.25410.65.53.255
10910.65.54.0/2510.65.54.1 – 10.65.54.12610.65.54.127
11010.65.54.128/2510.65.54.129 – 10.65.54.25410.65.54.255
11110.65.55.0/2510.65.55.1 – 10.65.55.12610.65.55.127
11210.65.55.128/2510.65.55.129 – 10.65.55.25410.65.55.255
11310.65.56.0/2510.65.56.1 – 10.65.56.12610.65.56.127
11410.65.56.128/2510.65.56.129 – 10.65.56.25410.65.56.255
11510.65.57.0/2510.65.57.1 – 10.65.57.12610.65.57.127
11610.65.57.128/2510.65.57.129 – 10.65.57.25410.65.57.255
11710.65.58.0/2510.65.58.1 – 10.65.58.12610.65.58.127
11810.65.58.128/2510.65.58.129 – 10.65.58.25410.65.58.255
11910.65.59.0/2510.65.59.1 – 10.65.59.12610.65.59.127
12010.65.59.128/2510.65.59.129 – 10.65.59.25410.65.59.255
12110.65.60.0/2510.65.60.1 – 10.65.60.12610.65.60.127
12210.65.60.128/2510.65.60.129 – 10.65.60.25410.65.60.255
12310.65.61.0/2510.65.61.1 – 10.65.61.12610.65.61.127
12410.65.61.128/2510.65.61.129 – 10.65.61.25410.65.61.255
12510.65.62.0/2510.65.62.1 – 10.65.62.12610.65.62.127
12610.65.62.128/2510.65.62.129 – 10.65.62.25410.65.62.255
12710.65.63.0/2510.65.63.1 – 10.65.63.12610.65.63.127
12810.65.63.128/2510.65.63.129 – 10.65.63.25410.65.63.255
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 →