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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)10.206.0.0/15
network10.206.0.0/15
broadcast10.207.255.255
first host10.206.0.1
last host10.207.255.254
subnet mask255.254.0.0
wildcard0.1.255.255
addresses131,072
usable hosts131,070
classA
ipcalc 10.206.0.0/15
address00001010.11001110.00000000.00000000
subnet mask11111111.11111110.00000000.00000000
network00001010.11001110.00000000.00000000
broadcast00001010.11001111.11111111.11111111
green = network part, grey = host part
hex0x0ace0000
decimal181272576
reverse dns0.0.206.10.in-addr.arpa
ipv4-mapped::ffff:ace:0

/15 split into /19 · 16 subnets

close ×
#networkhost rangebroadcast
110.206.0.0/1910.206.0.1 – 10.206.31.25410.206.31.255
210.206.32.0/1910.206.32.1 – 10.206.63.25410.206.63.255
310.206.64.0/1910.206.64.1 – 10.206.95.25410.206.95.255
410.206.96.0/1910.206.96.1 – 10.206.127.25410.206.127.255
510.206.128.0/1910.206.128.1 – 10.206.159.25410.206.159.255
610.206.160.0/1910.206.160.1 – 10.206.191.25410.206.191.255
710.206.192.0/1910.206.192.1 – 10.206.223.25410.206.223.255
810.206.224.0/1910.206.224.1 – 10.206.255.25410.206.255.255
910.207.0.0/1910.207.0.1 – 10.207.31.25410.207.31.255
1010.207.32.0/1910.207.32.1 – 10.207.63.25410.207.63.255
1110.207.64.0/1910.207.64.1 – 10.207.95.25410.207.95.255
1210.207.96.0/1910.207.96.1 – 10.207.127.25410.207.127.255
1310.207.128.0/1910.207.128.1 – 10.207.159.25410.207.159.255
1410.207.160.0/1910.207.160.1 – 10.207.191.25410.207.191.255
1510.207.192.0/1910.207.192.1 – 10.207.223.25410.207.223.255
1610.207.224.0/1910.207.224.1 – 10.207.255.25410.207.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /15
/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-
/15255.254.0.0131,072131,0701
/16255.255.0.065,53665,5342 split →
/17255.255.128.032,76832,7664 split →
/18255.255.192.016,38416,3828 split →
/19255.255.224.08,1928,19016 split →
/20255.255.240.04,0964,09432 split →
/21255.255.248.02,0482,04664 split →
/22255.255.252.01,0241,022128 split →
/23255.255.254.0512510256 split →
/24255.255.255.0256254512 split →
/25255.255.255.1281281261,024 split →
/26255.255.255.19264622,048 split →
/27255.255.255.22432304,096 split →
/28255.255.255.24016148,192 split →
/29255.255.255.2488616,384 split →
/30255.255.255.2524232,768 split →
/31255.255.255.2542265,536 split →
/32255.255.255.25511131,072 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 →