ip
ipku.in

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)10.56.0.0/17
network10.56.0.0/17
broadcast10.56.127.255
first host10.56.0.1
last host10.56.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.56.0.0/17
address00001010.00111000.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00111000.00000000.00000000
broadcast00001010.00111000.01111111.11111111
green = network part, grey = host part
hex0x0a380000
decimal171442176
reverse dns0.0.56.10.in-addr.arpa
ipv4-mapped::ffff:a38:0

/17 split into /22 · 32 subnets

close ×
#networkhost rangebroadcast
110.56.0.0/2210.56.0.1 – 10.56.3.25410.56.3.255
210.56.4.0/2210.56.4.1 – 10.56.7.25410.56.7.255
310.56.8.0/2210.56.8.1 – 10.56.11.25410.56.11.255
410.56.12.0/2210.56.12.1 – 10.56.15.25410.56.15.255
510.56.16.0/2210.56.16.1 – 10.56.19.25410.56.19.255
610.56.20.0/2210.56.20.1 – 10.56.23.25410.56.23.255
710.56.24.0/2210.56.24.1 – 10.56.27.25410.56.27.255
810.56.28.0/2210.56.28.1 – 10.56.31.25410.56.31.255
910.56.32.0/2210.56.32.1 – 10.56.35.25410.56.35.255
1010.56.36.0/2210.56.36.1 – 10.56.39.25410.56.39.255
1110.56.40.0/2210.56.40.1 – 10.56.43.25410.56.43.255
1210.56.44.0/2210.56.44.1 – 10.56.47.25410.56.47.255
1310.56.48.0/2210.56.48.1 – 10.56.51.25410.56.51.255
1410.56.52.0/2210.56.52.1 – 10.56.55.25410.56.55.255
1510.56.56.0/2210.56.56.1 – 10.56.59.25410.56.59.255
1610.56.60.0/2210.56.60.1 – 10.56.63.25410.56.63.255
1710.56.64.0/2210.56.64.1 – 10.56.67.25410.56.67.255
1810.56.68.0/2210.56.68.1 – 10.56.71.25410.56.71.255
1910.56.72.0/2210.56.72.1 – 10.56.75.25410.56.75.255
2010.56.76.0/2210.56.76.1 – 10.56.79.25410.56.79.255
2110.56.80.0/2210.56.80.1 – 10.56.83.25410.56.83.255
2210.56.84.0/2210.56.84.1 – 10.56.87.25410.56.87.255
2310.56.88.0/2210.56.88.1 – 10.56.91.25410.56.91.255
2410.56.92.0/2210.56.92.1 – 10.56.95.25410.56.95.255
2510.56.96.0/2210.56.96.1 – 10.56.99.25410.56.99.255
2610.56.100.0/2210.56.100.1 – 10.56.103.25410.56.103.255
2710.56.104.0/2210.56.104.1 – 10.56.107.25410.56.107.255
2810.56.108.0/2210.56.108.1 – 10.56.111.25410.56.111.255
2910.56.112.0/2210.56.112.1 – 10.56.115.25410.56.115.255
3010.56.116.0/2210.56.116.1 – 10.56.119.25410.56.119.255
3110.56.120.0/2210.56.120.1 – 10.56.123.25410.56.123.255
3210.56.124.0/2210.56.124.1 – 10.56.127.25410.56.127.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /17
/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-
/17255.255.128.032,76832,7661
/18255.255.192.016,38416,3822 split →
/19255.255.224.08,1928,1904 split →
/20255.255.240.04,0964,0948 split →
/21255.255.248.02,0482,04616 split →
/22255.255.252.01,0241,02232 split →
/23255.255.254.051251064 split →
/24255.255.255.0256254128 split →
/25255.255.255.128128126256 split →
/26255.255.255.1926462512 split →
/27255.255.255.22432301,024 split →
/28255.255.255.24016142,048 split →
/29255.255.255.248864,096 split →
/30255.255.255.252428,192 split →
/31255.255.255.2542216,384 split →
/32255.255.255.2551132,768 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 →