ip
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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)10.142.0.0/16
network10.142.0.0/16
broadcast10.142.255.255
first host10.142.0.1
last host10.142.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.142.0.0/16
address00001010.10001110.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.10001110.00000000.00000000
broadcast00001010.10001110.11111111.11111111
green = network part, grey = host part
hex0x0a8e0000
decimal177078272
reverse dns0.0.142.10.in-addr.arpa
ipv4-mapped::ffff:a8e:0

/16 split into /21 · 32 subnets

close ×
#networkhost rangebroadcast
110.142.0.0/2110.142.0.1 – 10.142.7.25410.142.7.255
210.142.8.0/2110.142.8.1 – 10.142.15.25410.142.15.255
310.142.16.0/2110.142.16.1 – 10.142.23.25410.142.23.255
410.142.24.0/2110.142.24.1 – 10.142.31.25410.142.31.255
510.142.32.0/2110.142.32.1 – 10.142.39.25410.142.39.255
610.142.40.0/2110.142.40.1 – 10.142.47.25410.142.47.255
710.142.48.0/2110.142.48.1 – 10.142.55.25410.142.55.255
810.142.56.0/2110.142.56.1 – 10.142.63.25410.142.63.255
910.142.64.0/2110.142.64.1 – 10.142.71.25410.142.71.255
1010.142.72.0/2110.142.72.1 – 10.142.79.25410.142.79.255
1110.142.80.0/2110.142.80.1 – 10.142.87.25410.142.87.255
1210.142.88.0/2110.142.88.1 – 10.142.95.25410.142.95.255
1310.142.96.0/2110.142.96.1 – 10.142.103.25410.142.103.255
1410.142.104.0/2110.142.104.1 – 10.142.111.25410.142.111.255
1510.142.112.0/2110.142.112.1 – 10.142.119.25410.142.119.255
1610.142.120.0/2110.142.120.1 – 10.142.127.25410.142.127.255
1710.142.128.0/2110.142.128.1 – 10.142.135.25410.142.135.255
1810.142.136.0/2110.142.136.1 – 10.142.143.25410.142.143.255
1910.142.144.0/2110.142.144.1 – 10.142.151.25410.142.151.255
2010.142.152.0/2110.142.152.1 – 10.142.159.25410.142.159.255
2110.142.160.0/2110.142.160.1 – 10.142.167.25410.142.167.255
2210.142.168.0/2110.142.168.1 – 10.142.175.25410.142.175.255
2310.142.176.0/2110.142.176.1 – 10.142.183.25410.142.183.255
2410.142.184.0/2110.142.184.1 – 10.142.191.25410.142.191.255
2510.142.192.0/2110.142.192.1 – 10.142.199.25410.142.199.255
2610.142.200.0/2110.142.200.1 – 10.142.207.25410.142.207.255
2710.142.208.0/2110.142.208.1 – 10.142.215.25410.142.215.255
2810.142.216.0/2110.142.216.1 – 10.142.223.25410.142.223.255
2910.142.224.0/2110.142.224.1 – 10.142.231.25410.142.231.255
3010.142.232.0/2110.142.232.1 – 10.142.239.25410.142.239.255
3110.142.240.0/2110.142.240.1 – 10.142.247.25410.142.247.255
3210.142.248.0/2110.142.248.1 – 10.142.255.25410.142.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /16
/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-
/16255.255.0.065,53665,5341
/17255.255.128.032,76832,7662 split →
/18255.255.192.016,38416,3824 split →
/19255.255.224.08,1928,1908 split →
/20255.255.240.04,0964,09416 split →
/21255.255.248.02,0482,04632 split →
/22255.255.252.01,0241,02264 split →
/23255.255.254.0512510128 split →
/24255.255.255.0256254256 split →
/25255.255.255.128128126512 split →
/26255.255.255.19264621,024 split →
/27255.255.255.22432302,048 split →
/28255.255.255.24016144,096 split →
/29255.255.255.248868,192 split →
/30255.255.255.2524216,384 split →
/31255.255.255.2542232,768 split →
/32255.255.255.2551165,536 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 →