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)10.40.0.0/18
network10.40.0.0/18
broadcast10.40.63.255
first host10.40.0.1
last host10.40.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.40.0.0/18
address00001010.00101000.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00101000.00000000.00000000
broadcast00001010.00101000.00111111.11111111
green = network part, grey = host part
hex0x0a280000
decimal170393600
reverse dns0.0.40.10.in-addr.arpa
ipv4-mapped::ffff:a28:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.40.0.0/2510.40.0.1 – 10.40.0.12610.40.0.127
210.40.0.128/2510.40.0.129 – 10.40.0.25410.40.0.255
310.40.1.0/2510.40.1.1 – 10.40.1.12610.40.1.127
410.40.1.128/2510.40.1.129 – 10.40.1.25410.40.1.255
510.40.2.0/2510.40.2.1 – 10.40.2.12610.40.2.127
610.40.2.128/2510.40.2.129 – 10.40.2.25410.40.2.255
710.40.3.0/2510.40.3.1 – 10.40.3.12610.40.3.127
810.40.3.128/2510.40.3.129 – 10.40.3.25410.40.3.255
910.40.4.0/2510.40.4.1 – 10.40.4.12610.40.4.127
1010.40.4.128/2510.40.4.129 – 10.40.4.25410.40.4.255
1110.40.5.0/2510.40.5.1 – 10.40.5.12610.40.5.127
1210.40.5.128/2510.40.5.129 – 10.40.5.25410.40.5.255
1310.40.6.0/2510.40.6.1 – 10.40.6.12610.40.6.127
1410.40.6.128/2510.40.6.129 – 10.40.6.25410.40.6.255
1510.40.7.0/2510.40.7.1 – 10.40.7.12610.40.7.127
1610.40.7.128/2510.40.7.129 – 10.40.7.25410.40.7.255
1710.40.8.0/2510.40.8.1 – 10.40.8.12610.40.8.127
1810.40.8.128/2510.40.8.129 – 10.40.8.25410.40.8.255
1910.40.9.0/2510.40.9.1 – 10.40.9.12610.40.9.127
2010.40.9.128/2510.40.9.129 – 10.40.9.25410.40.9.255
2110.40.10.0/2510.40.10.1 – 10.40.10.12610.40.10.127
2210.40.10.128/2510.40.10.129 – 10.40.10.25410.40.10.255
2310.40.11.0/2510.40.11.1 – 10.40.11.12610.40.11.127
2410.40.11.128/2510.40.11.129 – 10.40.11.25410.40.11.255
2510.40.12.0/2510.40.12.1 – 10.40.12.12610.40.12.127
2610.40.12.128/2510.40.12.129 – 10.40.12.25410.40.12.255
2710.40.13.0/2510.40.13.1 – 10.40.13.12610.40.13.127
2810.40.13.128/2510.40.13.129 – 10.40.13.25410.40.13.255
2910.40.14.0/2510.40.14.1 – 10.40.14.12610.40.14.127
3010.40.14.128/2510.40.14.129 – 10.40.14.25410.40.14.255
3110.40.15.0/2510.40.15.1 – 10.40.15.12610.40.15.127
3210.40.15.128/2510.40.15.129 – 10.40.15.25410.40.15.255
3310.40.16.0/2510.40.16.1 – 10.40.16.12610.40.16.127
3410.40.16.128/2510.40.16.129 – 10.40.16.25410.40.16.255
3510.40.17.0/2510.40.17.1 – 10.40.17.12610.40.17.127
3610.40.17.128/2510.40.17.129 – 10.40.17.25410.40.17.255
3710.40.18.0/2510.40.18.1 – 10.40.18.12610.40.18.127
3810.40.18.128/2510.40.18.129 – 10.40.18.25410.40.18.255
3910.40.19.0/2510.40.19.1 – 10.40.19.12610.40.19.127
4010.40.19.128/2510.40.19.129 – 10.40.19.25410.40.19.255
4110.40.20.0/2510.40.20.1 – 10.40.20.12610.40.20.127
4210.40.20.128/2510.40.20.129 – 10.40.20.25410.40.20.255
4310.40.21.0/2510.40.21.1 – 10.40.21.12610.40.21.127
4410.40.21.128/2510.40.21.129 – 10.40.21.25410.40.21.255
4510.40.22.0/2510.40.22.1 – 10.40.22.12610.40.22.127
4610.40.22.128/2510.40.22.129 – 10.40.22.25410.40.22.255
4710.40.23.0/2510.40.23.1 – 10.40.23.12610.40.23.127
4810.40.23.128/2510.40.23.129 – 10.40.23.25410.40.23.255
4910.40.24.0/2510.40.24.1 – 10.40.24.12610.40.24.127
5010.40.24.128/2510.40.24.129 – 10.40.24.25410.40.24.255
5110.40.25.0/2510.40.25.1 – 10.40.25.12610.40.25.127
5210.40.25.128/2510.40.25.129 – 10.40.25.25410.40.25.255
5310.40.26.0/2510.40.26.1 – 10.40.26.12610.40.26.127
5410.40.26.128/2510.40.26.129 – 10.40.26.25410.40.26.255
5510.40.27.0/2510.40.27.1 – 10.40.27.12610.40.27.127
5610.40.27.128/2510.40.27.129 – 10.40.27.25410.40.27.255
5710.40.28.0/2510.40.28.1 – 10.40.28.12610.40.28.127
5810.40.28.128/2510.40.28.129 – 10.40.28.25410.40.28.255
5910.40.29.0/2510.40.29.1 – 10.40.29.12610.40.29.127
6010.40.29.128/2510.40.29.129 – 10.40.29.25410.40.29.255
6110.40.30.0/2510.40.30.1 – 10.40.30.12610.40.30.127
6210.40.30.128/2510.40.30.129 – 10.40.30.25410.40.30.255
6310.40.31.0/2510.40.31.1 – 10.40.31.12610.40.31.127
6410.40.31.128/2510.40.31.129 – 10.40.31.25410.40.31.255
6510.40.32.0/2510.40.32.1 – 10.40.32.12610.40.32.127
6610.40.32.128/2510.40.32.129 – 10.40.32.25410.40.32.255
6710.40.33.0/2510.40.33.1 – 10.40.33.12610.40.33.127
6810.40.33.128/2510.40.33.129 – 10.40.33.25410.40.33.255
6910.40.34.0/2510.40.34.1 – 10.40.34.12610.40.34.127
7010.40.34.128/2510.40.34.129 – 10.40.34.25410.40.34.255
7110.40.35.0/2510.40.35.1 – 10.40.35.12610.40.35.127
7210.40.35.128/2510.40.35.129 – 10.40.35.25410.40.35.255
7310.40.36.0/2510.40.36.1 – 10.40.36.12610.40.36.127
7410.40.36.128/2510.40.36.129 – 10.40.36.25410.40.36.255
7510.40.37.0/2510.40.37.1 – 10.40.37.12610.40.37.127
7610.40.37.128/2510.40.37.129 – 10.40.37.25410.40.37.255
7710.40.38.0/2510.40.38.1 – 10.40.38.12610.40.38.127
7810.40.38.128/2510.40.38.129 – 10.40.38.25410.40.38.255
7910.40.39.0/2510.40.39.1 – 10.40.39.12610.40.39.127
8010.40.39.128/2510.40.39.129 – 10.40.39.25410.40.39.255
8110.40.40.0/2510.40.40.1 – 10.40.40.12610.40.40.127
8210.40.40.128/2510.40.40.129 – 10.40.40.25410.40.40.255
8310.40.41.0/2510.40.41.1 – 10.40.41.12610.40.41.127
8410.40.41.128/2510.40.41.129 – 10.40.41.25410.40.41.255
8510.40.42.0/2510.40.42.1 – 10.40.42.12610.40.42.127
8610.40.42.128/2510.40.42.129 – 10.40.42.25410.40.42.255
8710.40.43.0/2510.40.43.1 – 10.40.43.12610.40.43.127
8810.40.43.128/2510.40.43.129 – 10.40.43.25410.40.43.255
8910.40.44.0/2510.40.44.1 – 10.40.44.12610.40.44.127
9010.40.44.128/2510.40.44.129 – 10.40.44.25410.40.44.255
9110.40.45.0/2510.40.45.1 – 10.40.45.12610.40.45.127
9210.40.45.128/2510.40.45.129 – 10.40.45.25410.40.45.255
9310.40.46.0/2510.40.46.1 – 10.40.46.12610.40.46.127
9410.40.46.128/2510.40.46.129 – 10.40.46.25410.40.46.255
9510.40.47.0/2510.40.47.1 – 10.40.47.12610.40.47.127
9610.40.47.128/2510.40.47.129 – 10.40.47.25410.40.47.255
9710.40.48.0/2510.40.48.1 – 10.40.48.12610.40.48.127
9810.40.48.128/2510.40.48.129 – 10.40.48.25410.40.48.255
9910.40.49.0/2510.40.49.1 – 10.40.49.12610.40.49.127
10010.40.49.128/2510.40.49.129 – 10.40.49.25410.40.49.255
10110.40.50.0/2510.40.50.1 – 10.40.50.12610.40.50.127
10210.40.50.128/2510.40.50.129 – 10.40.50.25410.40.50.255
10310.40.51.0/2510.40.51.1 – 10.40.51.12610.40.51.127
10410.40.51.128/2510.40.51.129 – 10.40.51.25410.40.51.255
10510.40.52.0/2510.40.52.1 – 10.40.52.12610.40.52.127
10610.40.52.128/2510.40.52.129 – 10.40.52.25410.40.52.255
10710.40.53.0/2510.40.53.1 – 10.40.53.12610.40.53.127
10810.40.53.128/2510.40.53.129 – 10.40.53.25410.40.53.255
10910.40.54.0/2510.40.54.1 – 10.40.54.12610.40.54.127
11010.40.54.128/2510.40.54.129 – 10.40.54.25410.40.54.255
11110.40.55.0/2510.40.55.1 – 10.40.55.12610.40.55.127
11210.40.55.128/2510.40.55.129 – 10.40.55.25410.40.55.255
11310.40.56.0/2510.40.56.1 – 10.40.56.12610.40.56.127
11410.40.56.128/2510.40.56.129 – 10.40.56.25410.40.56.255
11510.40.57.0/2510.40.57.1 – 10.40.57.12610.40.57.127
11610.40.57.128/2510.40.57.129 – 10.40.57.25410.40.57.255
11710.40.58.0/2510.40.58.1 – 10.40.58.12610.40.58.127
11810.40.58.128/2510.40.58.129 – 10.40.58.25410.40.58.255
11910.40.59.0/2510.40.59.1 – 10.40.59.12610.40.59.127
12010.40.59.128/2510.40.59.129 – 10.40.59.25410.40.59.255
12110.40.60.0/2510.40.60.1 – 10.40.60.12610.40.60.127
12210.40.60.128/2510.40.60.129 – 10.40.60.25410.40.60.255
12310.40.61.0/2510.40.61.1 – 10.40.61.12610.40.61.127
12410.40.61.128/2510.40.61.129 – 10.40.61.25410.40.61.255
12510.40.62.0/2510.40.62.1 – 10.40.62.12610.40.62.127
12610.40.62.128/2510.40.62.129 – 10.40.62.25410.40.62.255
12710.40.63.0/2510.40.63.1 – 10.40.63.12610.40.63.127
12810.40.63.128/2510.40.63.129 – 10.40.63.25410.40.63.255
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 →