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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)10.0.0.0/9
network10.0.0.0/9
broadcast10.127.255.255
first host10.0.0.1
last host10.127.255.254
subnet mask255.128.0.0
wildcard0.127.255.255
addresses8,388,608
usable hosts8,388,606
classA
ipcalc 10.0.0.0/9
address00001010.00000000.00000000.00000000
subnet mask11111111.10000000.00000000.00000000
network00001010.00000000.00000000.00000000
broadcast00001010.01111111.11111111.11111111
green = network part, grey = host part
hex0x0a000000
decimal167772160
reverse dns0.0.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:0

/9 split into /13 · 16 subnets

close ×
#networkhost rangebroadcast
110.0.0.0/1310.0.0.1 – 10.7.255.25410.7.255.255
210.8.0.0/1310.8.0.1 – 10.15.255.25410.15.255.255
310.16.0.0/1310.16.0.1 – 10.23.255.25410.23.255.255
410.24.0.0/1310.24.0.1 – 10.31.255.25410.31.255.255
510.32.0.0/1310.32.0.1 – 10.39.255.25410.39.255.255
610.40.0.0/1310.40.0.1 – 10.47.255.25410.47.255.255
710.48.0.0/1310.48.0.1 – 10.55.255.25410.55.255.255
810.56.0.0/1310.56.0.1 – 10.63.255.25410.63.255.255
910.64.0.0/1310.64.0.1 – 10.71.255.25410.71.255.255
1010.72.0.0/1310.72.0.1 – 10.79.255.25410.79.255.255
1110.80.0.0/1310.80.0.1 – 10.87.255.25410.87.255.255
1210.88.0.0/1310.88.0.1 – 10.95.255.25410.95.255.255
1310.96.0.0/1310.96.0.1 – 10.103.255.25410.103.255.255
1410.104.0.0/1310.104.0.1 – 10.111.255.25410.111.255.255
1510.112.0.0/1310.112.0.1 – 10.119.255.25410.119.255.255
1610.120.0.0/1310.120.0.1 – 10.127.255.25410.127.255.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /9
/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-
/9255.128.0.08,388,6088,388,6061
/10255.192.0.04,194,3044,194,3022 split →
/11255.224.0.02,097,1522,097,1504 split →
/12255.240.0.01,048,5761,048,5748 split →
/13255.248.0.0524,288524,28616 split →
/14255.252.0.0262,144262,14232 split →
/15255.254.0.0131,072131,07064 split →
/16255.255.0.065,53665,534128 split →
/17255.255.128.032,76832,766256 split →
/18255.255.192.016,38416,382512 split →
/19255.255.224.08,1928,1901,024 split →
/20255.255.240.04,0964,0942,048 split →
/21255.255.248.02,0482,0464,096 split →
/22255.255.252.01,0241,0228,192 split →
/23255.255.254.051251016,384 split →
/24255.255.255.025625432,768 split →
/25255.255.255.12812812665,536 split →
/26255.255.255.1926462131,072 split →
/27255.255.255.2243230262,144 split →
/28255.255.255.2401614524,288 split →
/29255.255.255.248861,048,576 split →
/30255.255.255.252422,097,152 split →
/31255.255.255.254224,194,304 split →
/32255.255.255.255118,388,608 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 →