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)10.37.0.0/18
network10.37.0.0/18
broadcast10.37.63.255
first host10.37.0.1
last host10.37.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.37.0.0/18
address00001010.00100101.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00100101.00000000.00000000
broadcast00001010.00100101.00111111.11111111
green = network part, grey = host part
hex0x0a250000
decimal170196992
reverse dns0.0.37.10.in-addr.arpa
ipv4-mapped::ffff:a25:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.37.0.0/2510.37.0.1 – 10.37.0.12610.37.0.127
210.37.0.128/2510.37.0.129 – 10.37.0.25410.37.0.255
310.37.1.0/2510.37.1.1 – 10.37.1.12610.37.1.127
410.37.1.128/2510.37.1.129 – 10.37.1.25410.37.1.255
510.37.2.0/2510.37.2.1 – 10.37.2.12610.37.2.127
610.37.2.128/2510.37.2.129 – 10.37.2.25410.37.2.255
710.37.3.0/2510.37.3.1 – 10.37.3.12610.37.3.127
810.37.3.128/2510.37.3.129 – 10.37.3.25410.37.3.255
910.37.4.0/2510.37.4.1 – 10.37.4.12610.37.4.127
1010.37.4.128/2510.37.4.129 – 10.37.4.25410.37.4.255
1110.37.5.0/2510.37.5.1 – 10.37.5.12610.37.5.127
1210.37.5.128/2510.37.5.129 – 10.37.5.25410.37.5.255
1310.37.6.0/2510.37.6.1 – 10.37.6.12610.37.6.127
1410.37.6.128/2510.37.6.129 – 10.37.6.25410.37.6.255
1510.37.7.0/2510.37.7.1 – 10.37.7.12610.37.7.127
1610.37.7.128/2510.37.7.129 – 10.37.7.25410.37.7.255
1710.37.8.0/2510.37.8.1 – 10.37.8.12610.37.8.127
1810.37.8.128/2510.37.8.129 – 10.37.8.25410.37.8.255
1910.37.9.0/2510.37.9.1 – 10.37.9.12610.37.9.127
2010.37.9.128/2510.37.9.129 – 10.37.9.25410.37.9.255
2110.37.10.0/2510.37.10.1 – 10.37.10.12610.37.10.127
2210.37.10.128/2510.37.10.129 – 10.37.10.25410.37.10.255
2310.37.11.0/2510.37.11.1 – 10.37.11.12610.37.11.127
2410.37.11.128/2510.37.11.129 – 10.37.11.25410.37.11.255
2510.37.12.0/2510.37.12.1 – 10.37.12.12610.37.12.127
2610.37.12.128/2510.37.12.129 – 10.37.12.25410.37.12.255
2710.37.13.0/2510.37.13.1 – 10.37.13.12610.37.13.127
2810.37.13.128/2510.37.13.129 – 10.37.13.25410.37.13.255
2910.37.14.0/2510.37.14.1 – 10.37.14.12610.37.14.127
3010.37.14.128/2510.37.14.129 – 10.37.14.25410.37.14.255
3110.37.15.0/2510.37.15.1 – 10.37.15.12610.37.15.127
3210.37.15.128/2510.37.15.129 – 10.37.15.25410.37.15.255
3310.37.16.0/2510.37.16.1 – 10.37.16.12610.37.16.127
3410.37.16.128/2510.37.16.129 – 10.37.16.25410.37.16.255
3510.37.17.0/2510.37.17.1 – 10.37.17.12610.37.17.127
3610.37.17.128/2510.37.17.129 – 10.37.17.25410.37.17.255
3710.37.18.0/2510.37.18.1 – 10.37.18.12610.37.18.127
3810.37.18.128/2510.37.18.129 – 10.37.18.25410.37.18.255
3910.37.19.0/2510.37.19.1 – 10.37.19.12610.37.19.127
4010.37.19.128/2510.37.19.129 – 10.37.19.25410.37.19.255
4110.37.20.0/2510.37.20.1 – 10.37.20.12610.37.20.127
4210.37.20.128/2510.37.20.129 – 10.37.20.25410.37.20.255
4310.37.21.0/2510.37.21.1 – 10.37.21.12610.37.21.127
4410.37.21.128/2510.37.21.129 – 10.37.21.25410.37.21.255
4510.37.22.0/2510.37.22.1 – 10.37.22.12610.37.22.127
4610.37.22.128/2510.37.22.129 – 10.37.22.25410.37.22.255
4710.37.23.0/2510.37.23.1 – 10.37.23.12610.37.23.127
4810.37.23.128/2510.37.23.129 – 10.37.23.25410.37.23.255
4910.37.24.0/2510.37.24.1 – 10.37.24.12610.37.24.127
5010.37.24.128/2510.37.24.129 – 10.37.24.25410.37.24.255
5110.37.25.0/2510.37.25.1 – 10.37.25.12610.37.25.127
5210.37.25.128/2510.37.25.129 – 10.37.25.25410.37.25.255
5310.37.26.0/2510.37.26.1 – 10.37.26.12610.37.26.127
5410.37.26.128/2510.37.26.129 – 10.37.26.25410.37.26.255
5510.37.27.0/2510.37.27.1 – 10.37.27.12610.37.27.127
5610.37.27.128/2510.37.27.129 – 10.37.27.25410.37.27.255
5710.37.28.0/2510.37.28.1 – 10.37.28.12610.37.28.127
5810.37.28.128/2510.37.28.129 – 10.37.28.25410.37.28.255
5910.37.29.0/2510.37.29.1 – 10.37.29.12610.37.29.127
6010.37.29.128/2510.37.29.129 – 10.37.29.25410.37.29.255
6110.37.30.0/2510.37.30.1 – 10.37.30.12610.37.30.127
6210.37.30.128/2510.37.30.129 – 10.37.30.25410.37.30.255
6310.37.31.0/2510.37.31.1 – 10.37.31.12610.37.31.127
6410.37.31.128/2510.37.31.129 – 10.37.31.25410.37.31.255
6510.37.32.0/2510.37.32.1 – 10.37.32.12610.37.32.127
6610.37.32.128/2510.37.32.129 – 10.37.32.25410.37.32.255
6710.37.33.0/2510.37.33.1 – 10.37.33.12610.37.33.127
6810.37.33.128/2510.37.33.129 – 10.37.33.25410.37.33.255
6910.37.34.0/2510.37.34.1 – 10.37.34.12610.37.34.127
7010.37.34.128/2510.37.34.129 – 10.37.34.25410.37.34.255
7110.37.35.0/2510.37.35.1 – 10.37.35.12610.37.35.127
7210.37.35.128/2510.37.35.129 – 10.37.35.25410.37.35.255
7310.37.36.0/2510.37.36.1 – 10.37.36.12610.37.36.127
7410.37.36.128/2510.37.36.129 – 10.37.36.25410.37.36.255
7510.37.37.0/2510.37.37.1 – 10.37.37.12610.37.37.127
7610.37.37.128/2510.37.37.129 – 10.37.37.25410.37.37.255
7710.37.38.0/2510.37.38.1 – 10.37.38.12610.37.38.127
7810.37.38.128/2510.37.38.129 – 10.37.38.25410.37.38.255
7910.37.39.0/2510.37.39.1 – 10.37.39.12610.37.39.127
8010.37.39.128/2510.37.39.129 – 10.37.39.25410.37.39.255
8110.37.40.0/2510.37.40.1 – 10.37.40.12610.37.40.127
8210.37.40.128/2510.37.40.129 – 10.37.40.25410.37.40.255
8310.37.41.0/2510.37.41.1 – 10.37.41.12610.37.41.127
8410.37.41.128/2510.37.41.129 – 10.37.41.25410.37.41.255
8510.37.42.0/2510.37.42.1 – 10.37.42.12610.37.42.127
8610.37.42.128/2510.37.42.129 – 10.37.42.25410.37.42.255
8710.37.43.0/2510.37.43.1 – 10.37.43.12610.37.43.127
8810.37.43.128/2510.37.43.129 – 10.37.43.25410.37.43.255
8910.37.44.0/2510.37.44.1 – 10.37.44.12610.37.44.127
9010.37.44.128/2510.37.44.129 – 10.37.44.25410.37.44.255
9110.37.45.0/2510.37.45.1 – 10.37.45.12610.37.45.127
9210.37.45.128/2510.37.45.129 – 10.37.45.25410.37.45.255
9310.37.46.0/2510.37.46.1 – 10.37.46.12610.37.46.127
9410.37.46.128/2510.37.46.129 – 10.37.46.25410.37.46.255
9510.37.47.0/2510.37.47.1 – 10.37.47.12610.37.47.127
9610.37.47.128/2510.37.47.129 – 10.37.47.25410.37.47.255
9710.37.48.0/2510.37.48.1 – 10.37.48.12610.37.48.127
9810.37.48.128/2510.37.48.129 – 10.37.48.25410.37.48.255
9910.37.49.0/2510.37.49.1 – 10.37.49.12610.37.49.127
10010.37.49.128/2510.37.49.129 – 10.37.49.25410.37.49.255
10110.37.50.0/2510.37.50.1 – 10.37.50.12610.37.50.127
10210.37.50.128/2510.37.50.129 – 10.37.50.25410.37.50.255
10310.37.51.0/2510.37.51.1 – 10.37.51.12610.37.51.127
10410.37.51.128/2510.37.51.129 – 10.37.51.25410.37.51.255
10510.37.52.0/2510.37.52.1 – 10.37.52.12610.37.52.127
10610.37.52.128/2510.37.52.129 – 10.37.52.25410.37.52.255
10710.37.53.0/2510.37.53.1 – 10.37.53.12610.37.53.127
10810.37.53.128/2510.37.53.129 – 10.37.53.25410.37.53.255
10910.37.54.0/2510.37.54.1 – 10.37.54.12610.37.54.127
11010.37.54.128/2510.37.54.129 – 10.37.54.25410.37.54.255
11110.37.55.0/2510.37.55.1 – 10.37.55.12610.37.55.127
11210.37.55.128/2510.37.55.129 – 10.37.55.25410.37.55.255
11310.37.56.0/2510.37.56.1 – 10.37.56.12610.37.56.127
11410.37.56.128/2510.37.56.129 – 10.37.56.25410.37.56.255
11510.37.57.0/2510.37.57.1 – 10.37.57.12610.37.57.127
11610.37.57.128/2510.37.57.129 – 10.37.57.25410.37.57.255
11710.37.58.0/2510.37.58.1 – 10.37.58.12610.37.58.127
11810.37.58.128/2510.37.58.129 – 10.37.58.25410.37.58.255
11910.37.59.0/2510.37.59.1 – 10.37.59.12610.37.59.127
12010.37.59.128/2510.37.59.129 – 10.37.59.25410.37.59.255
12110.37.60.0/2510.37.60.1 – 10.37.60.12610.37.60.127
12210.37.60.128/2510.37.60.129 – 10.37.60.25410.37.60.255
12310.37.61.0/2510.37.61.1 – 10.37.61.12610.37.61.127
12410.37.61.128/2510.37.61.129 – 10.37.61.25410.37.61.255
12510.37.62.0/2510.37.62.1 – 10.37.62.12610.37.62.127
12610.37.62.128/2510.37.62.129 – 10.37.62.25410.37.62.255
12710.37.63.0/2510.37.63.1 – 10.37.63.12610.37.63.127
12810.37.63.128/2510.37.63.129 – 10.37.63.25410.37.63.255
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 →