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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)10.23.128.0/19
network10.23.128.0/19
broadcast10.23.159.255
first host10.23.128.1
last host10.23.159.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.23.128.0/19
address00001010.00010111.10000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010111.10000000.00000000
broadcast00001010.00010111.10011111.11111111
green = network part, grey = host part
hex0x0a178000
decimal169312256
reverse dns0.128.23.10.in-addr.arpa
ipv4-mapped::ffff:a17:8000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.23.128.0/2510.23.128.1 – 10.23.128.12610.23.128.127
210.23.128.128/2510.23.128.129 – 10.23.128.25410.23.128.255
310.23.129.0/2510.23.129.1 – 10.23.129.12610.23.129.127
410.23.129.128/2510.23.129.129 – 10.23.129.25410.23.129.255
510.23.130.0/2510.23.130.1 – 10.23.130.12610.23.130.127
610.23.130.128/2510.23.130.129 – 10.23.130.25410.23.130.255
710.23.131.0/2510.23.131.1 – 10.23.131.12610.23.131.127
810.23.131.128/2510.23.131.129 – 10.23.131.25410.23.131.255
910.23.132.0/2510.23.132.1 – 10.23.132.12610.23.132.127
1010.23.132.128/2510.23.132.129 – 10.23.132.25410.23.132.255
1110.23.133.0/2510.23.133.1 – 10.23.133.12610.23.133.127
1210.23.133.128/2510.23.133.129 – 10.23.133.25410.23.133.255
1310.23.134.0/2510.23.134.1 – 10.23.134.12610.23.134.127
1410.23.134.128/2510.23.134.129 – 10.23.134.25410.23.134.255
1510.23.135.0/2510.23.135.1 – 10.23.135.12610.23.135.127
1610.23.135.128/2510.23.135.129 – 10.23.135.25410.23.135.255
1710.23.136.0/2510.23.136.1 – 10.23.136.12610.23.136.127
1810.23.136.128/2510.23.136.129 – 10.23.136.25410.23.136.255
1910.23.137.0/2510.23.137.1 – 10.23.137.12610.23.137.127
2010.23.137.128/2510.23.137.129 – 10.23.137.25410.23.137.255
2110.23.138.0/2510.23.138.1 – 10.23.138.12610.23.138.127
2210.23.138.128/2510.23.138.129 – 10.23.138.25410.23.138.255
2310.23.139.0/2510.23.139.1 – 10.23.139.12610.23.139.127
2410.23.139.128/2510.23.139.129 – 10.23.139.25410.23.139.255
2510.23.140.0/2510.23.140.1 – 10.23.140.12610.23.140.127
2610.23.140.128/2510.23.140.129 – 10.23.140.25410.23.140.255
2710.23.141.0/2510.23.141.1 – 10.23.141.12610.23.141.127
2810.23.141.128/2510.23.141.129 – 10.23.141.25410.23.141.255
2910.23.142.0/2510.23.142.1 – 10.23.142.12610.23.142.127
3010.23.142.128/2510.23.142.129 – 10.23.142.25410.23.142.255
3110.23.143.0/2510.23.143.1 – 10.23.143.12610.23.143.127
3210.23.143.128/2510.23.143.129 – 10.23.143.25410.23.143.255
3310.23.144.0/2510.23.144.1 – 10.23.144.12610.23.144.127
3410.23.144.128/2510.23.144.129 – 10.23.144.25410.23.144.255
3510.23.145.0/2510.23.145.1 – 10.23.145.12610.23.145.127
3610.23.145.128/2510.23.145.129 – 10.23.145.25410.23.145.255
3710.23.146.0/2510.23.146.1 – 10.23.146.12610.23.146.127
3810.23.146.128/2510.23.146.129 – 10.23.146.25410.23.146.255
3910.23.147.0/2510.23.147.1 – 10.23.147.12610.23.147.127
4010.23.147.128/2510.23.147.129 – 10.23.147.25410.23.147.255
4110.23.148.0/2510.23.148.1 – 10.23.148.12610.23.148.127
4210.23.148.128/2510.23.148.129 – 10.23.148.25410.23.148.255
4310.23.149.0/2510.23.149.1 – 10.23.149.12610.23.149.127
4410.23.149.128/2510.23.149.129 – 10.23.149.25410.23.149.255
4510.23.150.0/2510.23.150.1 – 10.23.150.12610.23.150.127
4610.23.150.128/2510.23.150.129 – 10.23.150.25410.23.150.255
4710.23.151.0/2510.23.151.1 – 10.23.151.12610.23.151.127
4810.23.151.128/2510.23.151.129 – 10.23.151.25410.23.151.255
4910.23.152.0/2510.23.152.1 – 10.23.152.12610.23.152.127
5010.23.152.128/2510.23.152.129 – 10.23.152.25410.23.152.255
5110.23.153.0/2510.23.153.1 – 10.23.153.12610.23.153.127
5210.23.153.128/2510.23.153.129 – 10.23.153.25410.23.153.255
5310.23.154.0/2510.23.154.1 – 10.23.154.12610.23.154.127
5410.23.154.128/2510.23.154.129 – 10.23.154.25410.23.154.255
5510.23.155.0/2510.23.155.1 – 10.23.155.12610.23.155.127
5610.23.155.128/2510.23.155.129 – 10.23.155.25410.23.155.255
5710.23.156.0/2510.23.156.1 – 10.23.156.12610.23.156.127
5810.23.156.128/2510.23.156.129 – 10.23.156.25410.23.156.255
5910.23.157.0/2510.23.157.1 – 10.23.157.12610.23.157.127
6010.23.157.128/2510.23.157.129 – 10.23.157.25410.23.157.255
6110.23.158.0/2510.23.158.1 – 10.23.158.12610.23.158.127
6210.23.158.128/2510.23.158.129 – 10.23.158.25410.23.158.255
6310.23.159.0/2510.23.159.1 – 10.23.159.12610.23.159.127
6410.23.159.128/2510.23.159.129 – 10.23.159.25410.23.159.255
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 →