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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)10.45.0.0/16
network10.45.0.0/16
broadcast10.45.255.255
first host10.45.0.1
last host10.45.255.254
subnet mask255.255.0.0
wildcard0.0.255.255
addresses65,536
usable hosts65,534
classA
ipcalc 10.45.0.0/16
address00001010.00101101.00000000.00000000
subnet mask11111111.11111111.00000000.00000000
network00001010.00101101.00000000.00000000
broadcast00001010.00101101.11111111.11111111
green = network part, grey = host part
hex0x0a2d0000
decimal170721280
reverse dns0.0.45.10.in-addr.arpa
ipv4-mapped::ffff:a2d:0

/16 split into /20 · 16 subnets

close ×
#networkhost rangebroadcast
110.45.0.0/2010.45.0.1 – 10.45.15.25410.45.15.255
210.45.16.0/2010.45.16.1 – 10.45.31.25410.45.31.255
310.45.32.0/2010.45.32.1 – 10.45.47.25410.45.47.255
410.45.48.0/2010.45.48.1 – 10.45.63.25410.45.63.255
510.45.64.0/2010.45.64.1 – 10.45.79.25410.45.79.255
610.45.80.0/2010.45.80.1 – 10.45.95.25410.45.95.255
710.45.96.0/2010.45.96.1 – 10.45.111.25410.45.111.255
810.45.112.0/2010.45.112.1 – 10.45.127.25410.45.127.255
910.45.128.0/2010.45.128.1 – 10.45.143.25410.45.143.255
1010.45.144.0/2010.45.144.1 – 10.45.159.25410.45.159.255
1110.45.160.0/2010.45.160.1 – 10.45.175.25410.45.175.255
1210.45.176.0/2010.45.176.1 – 10.45.191.25410.45.191.255
1310.45.192.0/2010.45.192.1 – 10.45.207.25410.45.207.255
1410.45.208.0/2010.45.208.1 – 10.45.223.25410.45.223.255
1510.45.224.0/2010.45.224.1 – 10.45.239.25410.45.239.255
1610.45.240.0/2010.45.240.1 – 10.45.255.25410.45.255.255
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 →