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)10.45.0.0/18
network10.45.0.0/18
broadcast10.45.63.255
first host10.45.0.1
last host10.45.63.254
subnet mask255.255.192.0
wildcard0.0.63.255
addresses16,384
usable hosts16,382
classA
ipcalc 10.45.0.0/18
address00001010.00101101.00000000.00000000
subnet mask11111111.11111111.11000000.00000000
network00001010.00101101.00000000.00000000
broadcast00001010.00101101.00111111.11111111
green = network part, grey = host part
hex0x0a2d0000
decimal170721280
reverse dns0.0.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:0

/18 split into /25 · 128 subnets

close ×
#networkhost rangebroadcast
110.45.0.0/2510.45.0.1 – 10.45.0.12610.45.0.127
210.45.0.128/2510.45.0.129 – 10.45.0.25410.45.0.255
310.45.1.0/2510.45.1.1 – 10.45.1.12610.45.1.127
410.45.1.128/2510.45.1.129 – 10.45.1.25410.45.1.255
510.45.2.0/2510.45.2.1 – 10.45.2.12610.45.2.127
610.45.2.128/2510.45.2.129 – 10.45.2.25410.45.2.255
710.45.3.0/2510.45.3.1 – 10.45.3.12610.45.3.127
810.45.3.128/2510.45.3.129 – 10.45.3.25410.45.3.255
910.45.4.0/2510.45.4.1 – 10.45.4.12610.45.4.127
1010.45.4.128/2510.45.4.129 – 10.45.4.25410.45.4.255
1110.45.5.0/2510.45.5.1 – 10.45.5.12610.45.5.127
1210.45.5.128/2510.45.5.129 – 10.45.5.25410.45.5.255
1310.45.6.0/2510.45.6.1 – 10.45.6.12610.45.6.127
1410.45.6.128/2510.45.6.129 – 10.45.6.25410.45.6.255
1510.45.7.0/2510.45.7.1 – 10.45.7.12610.45.7.127
1610.45.7.128/2510.45.7.129 – 10.45.7.25410.45.7.255
1710.45.8.0/2510.45.8.1 – 10.45.8.12610.45.8.127
1810.45.8.128/2510.45.8.129 – 10.45.8.25410.45.8.255
1910.45.9.0/2510.45.9.1 – 10.45.9.12610.45.9.127
2010.45.9.128/2510.45.9.129 – 10.45.9.25410.45.9.255
2110.45.10.0/2510.45.10.1 – 10.45.10.12610.45.10.127
2210.45.10.128/2510.45.10.129 – 10.45.10.25410.45.10.255
2310.45.11.0/2510.45.11.1 – 10.45.11.12610.45.11.127
2410.45.11.128/2510.45.11.129 – 10.45.11.25410.45.11.255
2510.45.12.0/2510.45.12.1 – 10.45.12.12610.45.12.127
2610.45.12.128/2510.45.12.129 – 10.45.12.25410.45.12.255
2710.45.13.0/2510.45.13.1 – 10.45.13.12610.45.13.127
2810.45.13.128/2510.45.13.129 – 10.45.13.25410.45.13.255
2910.45.14.0/2510.45.14.1 – 10.45.14.12610.45.14.127
3010.45.14.128/2510.45.14.129 – 10.45.14.25410.45.14.255
3110.45.15.0/2510.45.15.1 – 10.45.15.12610.45.15.127
3210.45.15.128/2510.45.15.129 – 10.45.15.25410.45.15.255
3310.45.16.0/2510.45.16.1 – 10.45.16.12610.45.16.127
3410.45.16.128/2510.45.16.129 – 10.45.16.25410.45.16.255
3510.45.17.0/2510.45.17.1 – 10.45.17.12610.45.17.127
3610.45.17.128/2510.45.17.129 – 10.45.17.25410.45.17.255
3710.45.18.0/2510.45.18.1 – 10.45.18.12610.45.18.127
3810.45.18.128/2510.45.18.129 – 10.45.18.25410.45.18.255
3910.45.19.0/2510.45.19.1 – 10.45.19.12610.45.19.127
4010.45.19.128/2510.45.19.129 – 10.45.19.25410.45.19.255
4110.45.20.0/2510.45.20.1 – 10.45.20.12610.45.20.127
4210.45.20.128/2510.45.20.129 – 10.45.20.25410.45.20.255
4310.45.21.0/2510.45.21.1 – 10.45.21.12610.45.21.127
4410.45.21.128/2510.45.21.129 – 10.45.21.25410.45.21.255
4510.45.22.0/2510.45.22.1 – 10.45.22.12610.45.22.127
4610.45.22.128/2510.45.22.129 – 10.45.22.25410.45.22.255
4710.45.23.0/2510.45.23.1 – 10.45.23.12610.45.23.127
4810.45.23.128/2510.45.23.129 – 10.45.23.25410.45.23.255
4910.45.24.0/2510.45.24.1 – 10.45.24.12610.45.24.127
5010.45.24.128/2510.45.24.129 – 10.45.24.25410.45.24.255
5110.45.25.0/2510.45.25.1 – 10.45.25.12610.45.25.127
5210.45.25.128/2510.45.25.129 – 10.45.25.25410.45.25.255
5310.45.26.0/2510.45.26.1 – 10.45.26.12610.45.26.127
5410.45.26.128/2510.45.26.129 – 10.45.26.25410.45.26.255
5510.45.27.0/2510.45.27.1 – 10.45.27.12610.45.27.127
5610.45.27.128/2510.45.27.129 – 10.45.27.25410.45.27.255
5710.45.28.0/2510.45.28.1 – 10.45.28.12610.45.28.127
5810.45.28.128/2510.45.28.129 – 10.45.28.25410.45.28.255
5910.45.29.0/2510.45.29.1 – 10.45.29.12610.45.29.127
6010.45.29.128/2510.45.29.129 – 10.45.29.25410.45.29.255
6110.45.30.0/2510.45.30.1 – 10.45.30.12610.45.30.127
6210.45.30.128/2510.45.30.129 – 10.45.30.25410.45.30.255
6310.45.31.0/2510.45.31.1 – 10.45.31.12610.45.31.127
6410.45.31.128/2510.45.31.129 – 10.45.31.25410.45.31.255
6510.45.32.0/2510.45.32.1 – 10.45.32.12610.45.32.127
6610.45.32.128/2510.45.32.129 – 10.45.32.25410.45.32.255
6710.45.33.0/2510.45.33.1 – 10.45.33.12610.45.33.127
6810.45.33.128/2510.45.33.129 – 10.45.33.25410.45.33.255
6910.45.34.0/2510.45.34.1 – 10.45.34.12610.45.34.127
7010.45.34.128/2510.45.34.129 – 10.45.34.25410.45.34.255
7110.45.35.0/2510.45.35.1 – 10.45.35.12610.45.35.127
7210.45.35.128/2510.45.35.129 – 10.45.35.25410.45.35.255
7310.45.36.0/2510.45.36.1 – 10.45.36.12610.45.36.127
7410.45.36.128/2510.45.36.129 – 10.45.36.25410.45.36.255
7510.45.37.0/2510.45.37.1 – 10.45.37.12610.45.37.127
7610.45.37.128/2510.45.37.129 – 10.45.37.25410.45.37.255
7710.45.38.0/2510.45.38.1 – 10.45.38.12610.45.38.127
7810.45.38.128/2510.45.38.129 – 10.45.38.25410.45.38.255
7910.45.39.0/2510.45.39.1 – 10.45.39.12610.45.39.127
8010.45.39.128/2510.45.39.129 – 10.45.39.25410.45.39.255
8110.45.40.0/2510.45.40.1 – 10.45.40.12610.45.40.127
8210.45.40.128/2510.45.40.129 – 10.45.40.25410.45.40.255
8310.45.41.0/2510.45.41.1 – 10.45.41.12610.45.41.127
8410.45.41.128/2510.45.41.129 – 10.45.41.25410.45.41.255
8510.45.42.0/2510.45.42.1 – 10.45.42.12610.45.42.127
8610.45.42.128/2510.45.42.129 – 10.45.42.25410.45.42.255
8710.45.43.0/2510.45.43.1 – 10.45.43.12610.45.43.127
8810.45.43.128/2510.45.43.129 – 10.45.43.25410.45.43.255
8910.45.44.0/2510.45.44.1 – 10.45.44.12610.45.44.127
9010.45.44.128/2510.45.44.129 – 10.45.44.25410.45.44.255
9110.45.45.0/2510.45.45.1 – 10.45.45.12610.45.45.127
9210.45.45.128/2510.45.45.129 – 10.45.45.25410.45.45.255
9310.45.46.0/2510.45.46.1 – 10.45.46.12610.45.46.127
9410.45.46.128/2510.45.46.129 – 10.45.46.25410.45.46.255
9510.45.47.0/2510.45.47.1 – 10.45.47.12610.45.47.127
9610.45.47.128/2510.45.47.129 – 10.45.47.25410.45.47.255
9710.45.48.0/2510.45.48.1 – 10.45.48.12610.45.48.127
9810.45.48.128/2510.45.48.129 – 10.45.48.25410.45.48.255
9910.45.49.0/2510.45.49.1 – 10.45.49.12610.45.49.127
10010.45.49.128/2510.45.49.129 – 10.45.49.25410.45.49.255
10110.45.50.0/2510.45.50.1 – 10.45.50.12610.45.50.127
10210.45.50.128/2510.45.50.129 – 10.45.50.25410.45.50.255
10310.45.51.0/2510.45.51.1 – 10.45.51.12610.45.51.127
10410.45.51.128/2510.45.51.129 – 10.45.51.25410.45.51.255
10510.45.52.0/2510.45.52.1 – 10.45.52.12610.45.52.127
10610.45.52.128/2510.45.52.129 – 10.45.52.25410.45.52.255
10710.45.53.0/2510.45.53.1 – 10.45.53.12610.45.53.127
10810.45.53.128/2510.45.53.129 – 10.45.53.25410.45.53.255
10910.45.54.0/2510.45.54.1 – 10.45.54.12610.45.54.127
11010.45.54.128/2510.45.54.129 – 10.45.54.25410.45.54.255
11110.45.55.0/2510.45.55.1 – 10.45.55.12610.45.55.127
11210.45.55.128/2510.45.55.129 – 10.45.55.25410.45.55.255
11310.45.56.0/2510.45.56.1 – 10.45.56.12610.45.56.127
11410.45.56.128/2510.45.56.129 – 10.45.56.25410.45.56.255
11510.45.57.0/2510.45.57.1 – 10.45.57.12610.45.57.127
11610.45.57.128/2510.45.57.129 – 10.45.57.25410.45.57.255
11710.45.58.0/2510.45.58.1 – 10.45.58.12610.45.58.127
11810.45.58.128/2510.45.58.129 – 10.45.58.25410.45.58.255
11910.45.59.0/2510.45.59.1 – 10.45.59.12610.45.59.127
12010.45.59.128/2510.45.59.129 – 10.45.59.25410.45.59.255
12110.45.60.0/2510.45.60.1 – 10.45.60.12610.45.60.127
12210.45.60.128/2510.45.60.129 – 10.45.60.25410.45.60.255
12310.45.61.0/2510.45.61.1 – 10.45.61.12610.45.61.127
12410.45.61.128/2510.45.61.129 – 10.45.61.25410.45.61.255
12510.45.62.0/2510.45.62.1 – 10.45.62.12610.45.62.127
12610.45.62.128/2510.45.62.129 – 10.45.62.25410.45.62.255
12710.45.63.0/2510.45.63.1 – 10.45.63.12610.45.63.127
12810.45.63.128/2510.45.63.129 – 10.45.63.25410.45.63.255
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 →