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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)10.16.0.0/19
network10.16.0.0/19
broadcast10.16.31.255
first host10.16.0.1
last host10.16.31.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.16.0.0/19
address00001010.00010000.00000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010000.00000000.00000000
broadcast00001010.00010000.00011111.11111111
green = network part, grey = host part
hex0x0a100000
decimal168820736
reverse dns0.0.16.10.in-addr.arpa
ipv4-mapped::ffff:a10:0

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.16.0.0/2510.16.0.1 – 10.16.0.12610.16.0.127
210.16.0.128/2510.16.0.129 – 10.16.0.25410.16.0.255
310.16.1.0/2510.16.1.1 – 10.16.1.12610.16.1.127
410.16.1.128/2510.16.1.129 – 10.16.1.25410.16.1.255
510.16.2.0/2510.16.2.1 – 10.16.2.12610.16.2.127
610.16.2.128/2510.16.2.129 – 10.16.2.25410.16.2.255
710.16.3.0/2510.16.3.1 – 10.16.3.12610.16.3.127
810.16.3.128/2510.16.3.129 – 10.16.3.25410.16.3.255
910.16.4.0/2510.16.4.1 – 10.16.4.12610.16.4.127
1010.16.4.128/2510.16.4.129 – 10.16.4.25410.16.4.255
1110.16.5.0/2510.16.5.1 – 10.16.5.12610.16.5.127
1210.16.5.128/2510.16.5.129 – 10.16.5.25410.16.5.255
1310.16.6.0/2510.16.6.1 – 10.16.6.12610.16.6.127
1410.16.6.128/2510.16.6.129 – 10.16.6.25410.16.6.255
1510.16.7.0/2510.16.7.1 – 10.16.7.12610.16.7.127
1610.16.7.128/2510.16.7.129 – 10.16.7.25410.16.7.255
1710.16.8.0/2510.16.8.1 – 10.16.8.12610.16.8.127
1810.16.8.128/2510.16.8.129 – 10.16.8.25410.16.8.255
1910.16.9.0/2510.16.9.1 – 10.16.9.12610.16.9.127
2010.16.9.128/2510.16.9.129 – 10.16.9.25410.16.9.255
2110.16.10.0/2510.16.10.1 – 10.16.10.12610.16.10.127
2210.16.10.128/2510.16.10.129 – 10.16.10.25410.16.10.255
2310.16.11.0/2510.16.11.1 – 10.16.11.12610.16.11.127
2410.16.11.128/2510.16.11.129 – 10.16.11.25410.16.11.255
2510.16.12.0/2510.16.12.1 – 10.16.12.12610.16.12.127
2610.16.12.128/2510.16.12.129 – 10.16.12.25410.16.12.255
2710.16.13.0/2510.16.13.1 – 10.16.13.12610.16.13.127
2810.16.13.128/2510.16.13.129 – 10.16.13.25410.16.13.255
2910.16.14.0/2510.16.14.1 – 10.16.14.12610.16.14.127
3010.16.14.128/2510.16.14.129 – 10.16.14.25410.16.14.255
3110.16.15.0/2510.16.15.1 – 10.16.15.12610.16.15.127
3210.16.15.128/2510.16.15.129 – 10.16.15.25410.16.15.255
3310.16.16.0/2510.16.16.1 – 10.16.16.12610.16.16.127
3410.16.16.128/2510.16.16.129 – 10.16.16.25410.16.16.255
3510.16.17.0/2510.16.17.1 – 10.16.17.12610.16.17.127
3610.16.17.128/2510.16.17.129 – 10.16.17.25410.16.17.255
3710.16.18.0/2510.16.18.1 – 10.16.18.12610.16.18.127
3810.16.18.128/2510.16.18.129 – 10.16.18.25410.16.18.255
3910.16.19.0/2510.16.19.1 – 10.16.19.12610.16.19.127
4010.16.19.128/2510.16.19.129 – 10.16.19.25410.16.19.255
4110.16.20.0/2510.16.20.1 – 10.16.20.12610.16.20.127
4210.16.20.128/2510.16.20.129 – 10.16.20.25410.16.20.255
4310.16.21.0/2510.16.21.1 – 10.16.21.12610.16.21.127
4410.16.21.128/2510.16.21.129 – 10.16.21.25410.16.21.255
4510.16.22.0/2510.16.22.1 – 10.16.22.12610.16.22.127
4610.16.22.128/2510.16.22.129 – 10.16.22.25410.16.22.255
4710.16.23.0/2510.16.23.1 – 10.16.23.12610.16.23.127
4810.16.23.128/2510.16.23.129 – 10.16.23.25410.16.23.255
4910.16.24.0/2510.16.24.1 – 10.16.24.12610.16.24.127
5010.16.24.128/2510.16.24.129 – 10.16.24.25410.16.24.255
5110.16.25.0/2510.16.25.1 – 10.16.25.12610.16.25.127
5210.16.25.128/2510.16.25.129 – 10.16.25.25410.16.25.255
5310.16.26.0/2510.16.26.1 – 10.16.26.12610.16.26.127
5410.16.26.128/2510.16.26.129 – 10.16.26.25410.16.26.255
5510.16.27.0/2510.16.27.1 – 10.16.27.12610.16.27.127
5610.16.27.128/2510.16.27.129 – 10.16.27.25410.16.27.255
5710.16.28.0/2510.16.28.1 – 10.16.28.12610.16.28.127
5810.16.28.128/2510.16.28.129 – 10.16.28.25410.16.28.255
5910.16.29.0/2510.16.29.1 – 10.16.29.12610.16.29.127
6010.16.29.128/2510.16.29.129 – 10.16.29.25410.16.29.255
6110.16.30.0/2510.16.30.1 – 10.16.30.12610.16.30.127
6210.16.30.128/2510.16.30.129 – 10.16.30.25410.16.30.255
6310.16.31.0/2510.16.31.1 – 10.16.31.12610.16.31.127
6410.16.31.128/2510.16.31.129 – 10.16.31.25410.16.31.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /19
/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-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,1901
/20255.255.240.04,0964,0942 split →
/21255.255.248.02,0482,0464 split →
/22255.255.252.01,0241,0228 split →
/23255.255.254.051251016 split →
/24255.255.255.025625432 split →
/25255.255.255.12812812664 split →
/26255.255.255.1926462128 split →
/27255.255.255.2243230256 split →
/28255.255.255.2401614512 split →
/29255.255.255.248861,024 split →
/30255.255.255.252422,048 split →
/31255.255.255.254224,096 split →
/32255.255.255.255118,192 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 →