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)10.25.0.0/18
network10.25.0.0/18
broadcast10.25.63.255
first host10.25.0.1
last host10.25.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.25.0.0/18
address00001010.00011001.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00011001.00000000.00000000
broadcast00001010.00011001.00111111.11111111
green = network part, grey = host part
hex0x0a190000
decimal169410560
reverse dns0.0.25.10.in-addr.arpa
ipv4-mapped::ffff:a19:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.25.0.0/2510.25.0.1 – 10.25.0.12610.25.0.127
210.25.0.128/2510.25.0.129 – 10.25.0.25410.25.0.255
310.25.1.0/2510.25.1.1 – 10.25.1.12610.25.1.127
410.25.1.128/2510.25.1.129 – 10.25.1.25410.25.1.255
510.25.2.0/2510.25.2.1 – 10.25.2.12610.25.2.127
610.25.2.128/2510.25.2.129 – 10.25.2.25410.25.2.255
710.25.3.0/2510.25.3.1 – 10.25.3.12610.25.3.127
810.25.3.128/2510.25.3.129 – 10.25.3.25410.25.3.255
910.25.4.0/2510.25.4.1 – 10.25.4.12610.25.4.127
1010.25.4.128/2510.25.4.129 – 10.25.4.25410.25.4.255
1110.25.5.0/2510.25.5.1 – 10.25.5.12610.25.5.127
1210.25.5.128/2510.25.5.129 – 10.25.5.25410.25.5.255
1310.25.6.0/2510.25.6.1 – 10.25.6.12610.25.6.127
1410.25.6.128/2510.25.6.129 – 10.25.6.25410.25.6.255
1510.25.7.0/2510.25.7.1 – 10.25.7.12610.25.7.127
1610.25.7.128/2510.25.7.129 – 10.25.7.25410.25.7.255
1710.25.8.0/2510.25.8.1 – 10.25.8.12610.25.8.127
1810.25.8.128/2510.25.8.129 – 10.25.8.25410.25.8.255
1910.25.9.0/2510.25.9.1 – 10.25.9.12610.25.9.127
2010.25.9.128/2510.25.9.129 – 10.25.9.25410.25.9.255
2110.25.10.0/2510.25.10.1 – 10.25.10.12610.25.10.127
2210.25.10.128/2510.25.10.129 – 10.25.10.25410.25.10.255
2310.25.11.0/2510.25.11.1 – 10.25.11.12610.25.11.127
2410.25.11.128/2510.25.11.129 – 10.25.11.25410.25.11.255
2510.25.12.0/2510.25.12.1 – 10.25.12.12610.25.12.127
2610.25.12.128/2510.25.12.129 – 10.25.12.25410.25.12.255
2710.25.13.0/2510.25.13.1 – 10.25.13.12610.25.13.127
2810.25.13.128/2510.25.13.129 – 10.25.13.25410.25.13.255
2910.25.14.0/2510.25.14.1 – 10.25.14.12610.25.14.127
3010.25.14.128/2510.25.14.129 – 10.25.14.25410.25.14.255
3110.25.15.0/2510.25.15.1 – 10.25.15.12610.25.15.127
3210.25.15.128/2510.25.15.129 – 10.25.15.25410.25.15.255
3310.25.16.0/2510.25.16.1 – 10.25.16.12610.25.16.127
3410.25.16.128/2510.25.16.129 – 10.25.16.25410.25.16.255
3510.25.17.0/2510.25.17.1 – 10.25.17.12610.25.17.127
3610.25.17.128/2510.25.17.129 – 10.25.17.25410.25.17.255
3710.25.18.0/2510.25.18.1 – 10.25.18.12610.25.18.127
3810.25.18.128/2510.25.18.129 – 10.25.18.25410.25.18.255
3910.25.19.0/2510.25.19.1 – 10.25.19.12610.25.19.127
4010.25.19.128/2510.25.19.129 – 10.25.19.25410.25.19.255
4110.25.20.0/2510.25.20.1 – 10.25.20.12610.25.20.127
4210.25.20.128/2510.25.20.129 – 10.25.20.25410.25.20.255
4310.25.21.0/2510.25.21.1 – 10.25.21.12610.25.21.127
4410.25.21.128/2510.25.21.129 – 10.25.21.25410.25.21.255
4510.25.22.0/2510.25.22.1 – 10.25.22.12610.25.22.127
4610.25.22.128/2510.25.22.129 – 10.25.22.25410.25.22.255
4710.25.23.0/2510.25.23.1 – 10.25.23.12610.25.23.127
4810.25.23.128/2510.25.23.129 – 10.25.23.25410.25.23.255
4910.25.24.0/2510.25.24.1 – 10.25.24.12610.25.24.127
5010.25.24.128/2510.25.24.129 – 10.25.24.25410.25.24.255
5110.25.25.0/2510.25.25.1 – 10.25.25.12610.25.25.127
5210.25.25.128/2510.25.25.129 – 10.25.25.25410.25.25.255
5310.25.26.0/2510.25.26.1 – 10.25.26.12610.25.26.127
5410.25.26.128/2510.25.26.129 – 10.25.26.25410.25.26.255
5510.25.27.0/2510.25.27.1 – 10.25.27.12610.25.27.127
5610.25.27.128/2510.25.27.129 – 10.25.27.25410.25.27.255
5710.25.28.0/2510.25.28.1 – 10.25.28.12610.25.28.127
5810.25.28.128/2510.25.28.129 – 10.25.28.25410.25.28.255
5910.25.29.0/2510.25.29.1 – 10.25.29.12610.25.29.127
6010.25.29.128/2510.25.29.129 – 10.25.29.25410.25.29.255
6110.25.30.0/2510.25.30.1 – 10.25.30.12610.25.30.127
6210.25.30.128/2510.25.30.129 – 10.25.30.25410.25.30.255
6310.25.31.0/2510.25.31.1 – 10.25.31.12610.25.31.127
6410.25.31.128/2510.25.31.129 – 10.25.31.25410.25.31.255
6510.25.32.0/2510.25.32.1 – 10.25.32.12610.25.32.127
6610.25.32.128/2510.25.32.129 – 10.25.32.25410.25.32.255
6710.25.33.0/2510.25.33.1 – 10.25.33.12610.25.33.127
6810.25.33.128/2510.25.33.129 – 10.25.33.25410.25.33.255
6910.25.34.0/2510.25.34.1 – 10.25.34.12610.25.34.127
7010.25.34.128/2510.25.34.129 – 10.25.34.25410.25.34.255
7110.25.35.0/2510.25.35.1 – 10.25.35.12610.25.35.127
7210.25.35.128/2510.25.35.129 – 10.25.35.25410.25.35.255
7310.25.36.0/2510.25.36.1 – 10.25.36.12610.25.36.127
7410.25.36.128/2510.25.36.129 – 10.25.36.25410.25.36.255
7510.25.37.0/2510.25.37.1 – 10.25.37.12610.25.37.127
7610.25.37.128/2510.25.37.129 – 10.25.37.25410.25.37.255
7710.25.38.0/2510.25.38.1 – 10.25.38.12610.25.38.127
7810.25.38.128/2510.25.38.129 – 10.25.38.25410.25.38.255
7910.25.39.0/2510.25.39.1 – 10.25.39.12610.25.39.127
8010.25.39.128/2510.25.39.129 – 10.25.39.25410.25.39.255
8110.25.40.0/2510.25.40.1 – 10.25.40.12610.25.40.127
8210.25.40.128/2510.25.40.129 – 10.25.40.25410.25.40.255
8310.25.41.0/2510.25.41.1 – 10.25.41.12610.25.41.127
8410.25.41.128/2510.25.41.129 – 10.25.41.25410.25.41.255
8510.25.42.0/2510.25.42.1 – 10.25.42.12610.25.42.127
8610.25.42.128/2510.25.42.129 – 10.25.42.25410.25.42.255
8710.25.43.0/2510.25.43.1 – 10.25.43.12610.25.43.127
8810.25.43.128/2510.25.43.129 – 10.25.43.25410.25.43.255
8910.25.44.0/2510.25.44.1 – 10.25.44.12610.25.44.127
9010.25.44.128/2510.25.44.129 – 10.25.44.25410.25.44.255
9110.25.45.0/2510.25.45.1 – 10.25.45.12610.25.45.127
9210.25.45.128/2510.25.45.129 – 10.25.45.25410.25.45.255
9310.25.46.0/2510.25.46.1 – 10.25.46.12610.25.46.127
9410.25.46.128/2510.25.46.129 – 10.25.46.25410.25.46.255
9510.25.47.0/2510.25.47.1 – 10.25.47.12610.25.47.127
9610.25.47.128/2510.25.47.129 – 10.25.47.25410.25.47.255
9710.25.48.0/2510.25.48.1 – 10.25.48.12610.25.48.127
9810.25.48.128/2510.25.48.129 – 10.25.48.25410.25.48.255
9910.25.49.0/2510.25.49.1 – 10.25.49.12610.25.49.127
10010.25.49.128/2510.25.49.129 – 10.25.49.25410.25.49.255
10110.25.50.0/2510.25.50.1 – 10.25.50.12610.25.50.127
10210.25.50.128/2510.25.50.129 – 10.25.50.25410.25.50.255
10310.25.51.0/2510.25.51.1 – 10.25.51.12610.25.51.127
10410.25.51.128/2510.25.51.129 – 10.25.51.25410.25.51.255
10510.25.52.0/2510.25.52.1 – 10.25.52.12610.25.52.127
10610.25.52.128/2510.25.52.129 – 10.25.52.25410.25.52.255
10710.25.53.0/2510.25.53.1 – 10.25.53.12610.25.53.127
10810.25.53.128/2510.25.53.129 – 10.25.53.25410.25.53.255
10910.25.54.0/2510.25.54.1 – 10.25.54.12610.25.54.127
11010.25.54.128/2510.25.54.129 – 10.25.54.25410.25.54.255
11110.25.55.0/2510.25.55.1 – 10.25.55.12610.25.55.127
11210.25.55.128/2510.25.55.129 – 10.25.55.25410.25.55.255
11310.25.56.0/2510.25.56.1 – 10.25.56.12610.25.56.127
11410.25.56.128/2510.25.56.129 – 10.25.56.25410.25.56.255
11510.25.57.0/2510.25.57.1 – 10.25.57.12610.25.57.127
11610.25.57.128/2510.25.57.129 – 10.25.57.25410.25.57.255
11710.25.58.0/2510.25.58.1 – 10.25.58.12610.25.58.127
11810.25.58.128/2510.25.58.129 – 10.25.58.25410.25.58.255
11910.25.59.0/2510.25.59.1 – 10.25.59.12610.25.59.127
12010.25.59.128/2510.25.59.129 – 10.25.59.25410.25.59.255
12110.25.60.0/2510.25.60.1 – 10.25.60.12610.25.60.127
12210.25.60.128/2510.25.60.129 – 10.25.60.25410.25.60.255
12310.25.61.0/2510.25.61.1 – 10.25.61.12610.25.61.127
12410.25.61.128/2510.25.61.129 – 10.25.61.25410.25.61.255
12510.25.62.0/2510.25.62.1 – 10.25.62.12610.25.62.127
12610.25.62.128/2510.25.62.129 – 10.25.62.25410.25.62.255
12710.25.63.0/2510.25.63.1 – 10.25.63.12610.25.63.127
12810.25.63.128/2510.25.63.129 – 10.25.63.25410.25.63.255
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 →