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)10.19.0.0/18
network10.19.0.0/18
broadcast10.19.63.255
first host10.19.0.1
last host10.19.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.19.0.0/18
address00001010.00010011.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00010011.00000000.00000000
broadcast00001010.00010011.00111111.11111111
green = network part, grey = host part
hex0x0a130000
decimal169017344
reverse dns0.0.19.10.in-addr.arpa
ipv4-mapped::ffff:a13:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.19.0.0/2510.19.0.1 – 10.19.0.12610.19.0.127
210.19.0.128/2510.19.0.129 – 10.19.0.25410.19.0.255
310.19.1.0/2510.19.1.1 – 10.19.1.12610.19.1.127
410.19.1.128/2510.19.1.129 – 10.19.1.25410.19.1.255
510.19.2.0/2510.19.2.1 – 10.19.2.12610.19.2.127
610.19.2.128/2510.19.2.129 – 10.19.2.25410.19.2.255
710.19.3.0/2510.19.3.1 – 10.19.3.12610.19.3.127
810.19.3.128/2510.19.3.129 – 10.19.3.25410.19.3.255
910.19.4.0/2510.19.4.1 – 10.19.4.12610.19.4.127
1010.19.4.128/2510.19.4.129 – 10.19.4.25410.19.4.255
1110.19.5.0/2510.19.5.1 – 10.19.5.12610.19.5.127
1210.19.5.128/2510.19.5.129 – 10.19.5.25410.19.5.255
1310.19.6.0/2510.19.6.1 – 10.19.6.12610.19.6.127
1410.19.6.128/2510.19.6.129 – 10.19.6.25410.19.6.255
1510.19.7.0/2510.19.7.1 – 10.19.7.12610.19.7.127
1610.19.7.128/2510.19.7.129 – 10.19.7.25410.19.7.255
1710.19.8.0/2510.19.8.1 – 10.19.8.12610.19.8.127
1810.19.8.128/2510.19.8.129 – 10.19.8.25410.19.8.255
1910.19.9.0/2510.19.9.1 – 10.19.9.12610.19.9.127
2010.19.9.128/2510.19.9.129 – 10.19.9.25410.19.9.255
2110.19.10.0/2510.19.10.1 – 10.19.10.12610.19.10.127
2210.19.10.128/2510.19.10.129 – 10.19.10.25410.19.10.255
2310.19.11.0/2510.19.11.1 – 10.19.11.12610.19.11.127
2410.19.11.128/2510.19.11.129 – 10.19.11.25410.19.11.255
2510.19.12.0/2510.19.12.1 – 10.19.12.12610.19.12.127
2610.19.12.128/2510.19.12.129 – 10.19.12.25410.19.12.255
2710.19.13.0/2510.19.13.1 – 10.19.13.12610.19.13.127
2810.19.13.128/2510.19.13.129 – 10.19.13.25410.19.13.255
2910.19.14.0/2510.19.14.1 – 10.19.14.12610.19.14.127
3010.19.14.128/2510.19.14.129 – 10.19.14.25410.19.14.255
3110.19.15.0/2510.19.15.1 – 10.19.15.12610.19.15.127
3210.19.15.128/2510.19.15.129 – 10.19.15.25410.19.15.255
3310.19.16.0/2510.19.16.1 – 10.19.16.12610.19.16.127
3410.19.16.128/2510.19.16.129 – 10.19.16.25410.19.16.255
3510.19.17.0/2510.19.17.1 – 10.19.17.12610.19.17.127
3610.19.17.128/2510.19.17.129 – 10.19.17.25410.19.17.255
3710.19.18.0/2510.19.18.1 – 10.19.18.12610.19.18.127
3810.19.18.128/2510.19.18.129 – 10.19.18.25410.19.18.255
3910.19.19.0/2510.19.19.1 – 10.19.19.12610.19.19.127
4010.19.19.128/2510.19.19.129 – 10.19.19.25410.19.19.255
4110.19.20.0/2510.19.20.1 – 10.19.20.12610.19.20.127
4210.19.20.128/2510.19.20.129 – 10.19.20.25410.19.20.255
4310.19.21.0/2510.19.21.1 – 10.19.21.12610.19.21.127
4410.19.21.128/2510.19.21.129 – 10.19.21.25410.19.21.255
4510.19.22.0/2510.19.22.1 – 10.19.22.12610.19.22.127
4610.19.22.128/2510.19.22.129 – 10.19.22.25410.19.22.255
4710.19.23.0/2510.19.23.1 – 10.19.23.12610.19.23.127
4810.19.23.128/2510.19.23.129 – 10.19.23.25410.19.23.255
4910.19.24.0/2510.19.24.1 – 10.19.24.12610.19.24.127
5010.19.24.128/2510.19.24.129 – 10.19.24.25410.19.24.255
5110.19.25.0/2510.19.25.1 – 10.19.25.12610.19.25.127
5210.19.25.128/2510.19.25.129 – 10.19.25.25410.19.25.255
5310.19.26.0/2510.19.26.1 – 10.19.26.12610.19.26.127
5410.19.26.128/2510.19.26.129 – 10.19.26.25410.19.26.255
5510.19.27.0/2510.19.27.1 – 10.19.27.12610.19.27.127
5610.19.27.128/2510.19.27.129 – 10.19.27.25410.19.27.255
5710.19.28.0/2510.19.28.1 – 10.19.28.12610.19.28.127
5810.19.28.128/2510.19.28.129 – 10.19.28.25410.19.28.255
5910.19.29.0/2510.19.29.1 – 10.19.29.12610.19.29.127
6010.19.29.128/2510.19.29.129 – 10.19.29.25410.19.29.255
6110.19.30.0/2510.19.30.1 – 10.19.30.12610.19.30.127
6210.19.30.128/2510.19.30.129 – 10.19.30.25410.19.30.255
6310.19.31.0/2510.19.31.1 – 10.19.31.12610.19.31.127
6410.19.31.128/2510.19.31.129 – 10.19.31.25410.19.31.255
6510.19.32.0/2510.19.32.1 – 10.19.32.12610.19.32.127
6610.19.32.128/2510.19.32.129 – 10.19.32.25410.19.32.255
6710.19.33.0/2510.19.33.1 – 10.19.33.12610.19.33.127
6810.19.33.128/2510.19.33.129 – 10.19.33.25410.19.33.255
6910.19.34.0/2510.19.34.1 – 10.19.34.12610.19.34.127
7010.19.34.128/2510.19.34.129 – 10.19.34.25410.19.34.255
7110.19.35.0/2510.19.35.1 – 10.19.35.12610.19.35.127
7210.19.35.128/2510.19.35.129 – 10.19.35.25410.19.35.255
7310.19.36.0/2510.19.36.1 – 10.19.36.12610.19.36.127
7410.19.36.128/2510.19.36.129 – 10.19.36.25410.19.36.255
7510.19.37.0/2510.19.37.1 – 10.19.37.12610.19.37.127
7610.19.37.128/2510.19.37.129 – 10.19.37.25410.19.37.255
7710.19.38.0/2510.19.38.1 – 10.19.38.12610.19.38.127
7810.19.38.128/2510.19.38.129 – 10.19.38.25410.19.38.255
7910.19.39.0/2510.19.39.1 – 10.19.39.12610.19.39.127
8010.19.39.128/2510.19.39.129 – 10.19.39.25410.19.39.255
8110.19.40.0/2510.19.40.1 – 10.19.40.12610.19.40.127
8210.19.40.128/2510.19.40.129 – 10.19.40.25410.19.40.255
8310.19.41.0/2510.19.41.1 – 10.19.41.12610.19.41.127
8410.19.41.128/2510.19.41.129 – 10.19.41.25410.19.41.255
8510.19.42.0/2510.19.42.1 – 10.19.42.12610.19.42.127
8610.19.42.128/2510.19.42.129 – 10.19.42.25410.19.42.255
8710.19.43.0/2510.19.43.1 – 10.19.43.12610.19.43.127
8810.19.43.128/2510.19.43.129 – 10.19.43.25410.19.43.255
8910.19.44.0/2510.19.44.1 – 10.19.44.12610.19.44.127
9010.19.44.128/2510.19.44.129 – 10.19.44.25410.19.44.255
9110.19.45.0/2510.19.45.1 – 10.19.45.12610.19.45.127
9210.19.45.128/2510.19.45.129 – 10.19.45.25410.19.45.255
9310.19.46.0/2510.19.46.1 – 10.19.46.12610.19.46.127
9410.19.46.128/2510.19.46.129 – 10.19.46.25410.19.46.255
9510.19.47.0/2510.19.47.1 – 10.19.47.12610.19.47.127
9610.19.47.128/2510.19.47.129 – 10.19.47.25410.19.47.255
9710.19.48.0/2510.19.48.1 – 10.19.48.12610.19.48.127
9810.19.48.128/2510.19.48.129 – 10.19.48.25410.19.48.255
9910.19.49.0/2510.19.49.1 – 10.19.49.12610.19.49.127
10010.19.49.128/2510.19.49.129 – 10.19.49.25410.19.49.255
10110.19.50.0/2510.19.50.1 – 10.19.50.12610.19.50.127
10210.19.50.128/2510.19.50.129 – 10.19.50.25410.19.50.255
10310.19.51.0/2510.19.51.1 – 10.19.51.12610.19.51.127
10410.19.51.128/2510.19.51.129 – 10.19.51.25410.19.51.255
10510.19.52.0/2510.19.52.1 – 10.19.52.12610.19.52.127
10610.19.52.128/2510.19.52.129 – 10.19.52.25410.19.52.255
10710.19.53.0/2510.19.53.1 – 10.19.53.12610.19.53.127
10810.19.53.128/2510.19.53.129 – 10.19.53.25410.19.53.255
10910.19.54.0/2510.19.54.1 – 10.19.54.12610.19.54.127
11010.19.54.128/2510.19.54.129 – 10.19.54.25410.19.54.255
11110.19.55.0/2510.19.55.1 – 10.19.55.12610.19.55.127
11210.19.55.128/2510.19.55.129 – 10.19.55.25410.19.55.255
11310.19.56.0/2510.19.56.1 – 10.19.56.12610.19.56.127
11410.19.56.128/2510.19.56.129 – 10.19.56.25410.19.56.255
11510.19.57.0/2510.19.57.1 – 10.19.57.12610.19.57.127
11610.19.57.128/2510.19.57.129 – 10.19.57.25410.19.57.255
11710.19.58.0/2510.19.58.1 – 10.19.58.12610.19.58.127
11810.19.58.128/2510.19.58.129 – 10.19.58.25410.19.58.255
11910.19.59.0/2510.19.59.1 – 10.19.59.12610.19.59.127
12010.19.59.128/2510.19.59.129 – 10.19.59.25410.19.59.255
12110.19.60.0/2510.19.60.1 – 10.19.60.12610.19.60.127
12210.19.60.128/2510.19.60.129 – 10.19.60.25410.19.60.255
12310.19.61.0/2510.19.61.1 – 10.19.61.12610.19.61.127
12410.19.61.128/2510.19.61.129 – 10.19.61.25410.19.61.255
12510.19.62.0/2510.19.62.1 – 10.19.62.12610.19.62.127
12610.19.62.128/2510.19.62.129 – 10.19.62.25410.19.62.255
12710.19.63.0/2510.19.63.1 – 10.19.63.12610.19.63.127
12810.19.63.128/2510.19.63.129 – 10.19.63.25410.19.63.255
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 →