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)10.91.0.0/17
network10.91.0.0/17
broadcast10.91.127.255
first host10.91.0.1
last host10.91.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.91.0.0/17
address00001010.01011011.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01011011.00000000.00000000
broadcast00001010.01011011.01111111.11111111
green = network part, grey = host part
hex0x0a5b0000
decimal173735936
reverse dns0.0.91.10.in-addr.arpa
ipv4-mapped::ffff:a5b:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.91.0.0/2310.91.0.1 – 10.91.1.25410.91.1.255
210.91.2.0/2310.91.2.1 – 10.91.3.25410.91.3.255
310.91.4.0/2310.91.4.1 – 10.91.5.25410.91.5.255
410.91.6.0/2310.91.6.1 – 10.91.7.25410.91.7.255
510.91.8.0/2310.91.8.1 – 10.91.9.25410.91.9.255
610.91.10.0/2310.91.10.1 – 10.91.11.25410.91.11.255
710.91.12.0/2310.91.12.1 – 10.91.13.25410.91.13.255
810.91.14.0/2310.91.14.1 – 10.91.15.25410.91.15.255
910.91.16.0/2310.91.16.1 – 10.91.17.25410.91.17.255
1010.91.18.0/2310.91.18.1 – 10.91.19.25410.91.19.255
1110.91.20.0/2310.91.20.1 – 10.91.21.25410.91.21.255
1210.91.22.0/2310.91.22.1 – 10.91.23.25410.91.23.255
1310.91.24.0/2310.91.24.1 – 10.91.25.25410.91.25.255
1410.91.26.0/2310.91.26.1 – 10.91.27.25410.91.27.255
1510.91.28.0/2310.91.28.1 – 10.91.29.25410.91.29.255
1610.91.30.0/2310.91.30.1 – 10.91.31.25410.91.31.255
1710.91.32.0/2310.91.32.1 – 10.91.33.25410.91.33.255
1810.91.34.0/2310.91.34.1 – 10.91.35.25410.91.35.255
1910.91.36.0/2310.91.36.1 – 10.91.37.25410.91.37.255
2010.91.38.0/2310.91.38.1 – 10.91.39.25410.91.39.255
2110.91.40.0/2310.91.40.1 – 10.91.41.25410.91.41.255
2210.91.42.0/2310.91.42.1 – 10.91.43.25410.91.43.255
2310.91.44.0/2310.91.44.1 – 10.91.45.25410.91.45.255
2410.91.46.0/2310.91.46.1 – 10.91.47.25410.91.47.255
2510.91.48.0/2310.91.48.1 – 10.91.49.25410.91.49.255
2610.91.50.0/2310.91.50.1 – 10.91.51.25410.91.51.255
2710.91.52.0/2310.91.52.1 – 10.91.53.25410.91.53.255
2810.91.54.0/2310.91.54.1 – 10.91.55.25410.91.55.255
2910.91.56.0/2310.91.56.1 – 10.91.57.25410.91.57.255
3010.91.58.0/2310.91.58.1 – 10.91.59.25410.91.59.255
3110.91.60.0/2310.91.60.1 – 10.91.61.25410.91.61.255
3210.91.62.0/2310.91.62.1 – 10.91.63.25410.91.63.255
3310.91.64.0/2310.91.64.1 – 10.91.65.25410.91.65.255
3410.91.66.0/2310.91.66.1 – 10.91.67.25410.91.67.255
3510.91.68.0/2310.91.68.1 – 10.91.69.25410.91.69.255
3610.91.70.0/2310.91.70.1 – 10.91.71.25410.91.71.255
3710.91.72.0/2310.91.72.1 – 10.91.73.25410.91.73.255
3810.91.74.0/2310.91.74.1 – 10.91.75.25410.91.75.255
3910.91.76.0/2310.91.76.1 – 10.91.77.25410.91.77.255
4010.91.78.0/2310.91.78.1 – 10.91.79.25410.91.79.255
4110.91.80.0/2310.91.80.1 – 10.91.81.25410.91.81.255
4210.91.82.0/2310.91.82.1 – 10.91.83.25410.91.83.255
4310.91.84.0/2310.91.84.1 – 10.91.85.25410.91.85.255
4410.91.86.0/2310.91.86.1 – 10.91.87.25410.91.87.255
4510.91.88.0/2310.91.88.1 – 10.91.89.25410.91.89.255
4610.91.90.0/2310.91.90.1 – 10.91.91.25410.91.91.255
4710.91.92.0/2310.91.92.1 – 10.91.93.25410.91.93.255
4810.91.94.0/2310.91.94.1 – 10.91.95.25410.91.95.255
4910.91.96.0/2310.91.96.1 – 10.91.97.25410.91.97.255
5010.91.98.0/2310.91.98.1 – 10.91.99.25410.91.99.255
5110.91.100.0/2310.91.100.1 – 10.91.101.25410.91.101.255
5210.91.102.0/2310.91.102.1 – 10.91.103.25410.91.103.255
5310.91.104.0/2310.91.104.1 – 10.91.105.25410.91.105.255
5410.91.106.0/2310.91.106.1 – 10.91.107.25410.91.107.255
5510.91.108.0/2310.91.108.1 – 10.91.109.25410.91.109.255
5610.91.110.0/2310.91.110.1 – 10.91.111.25410.91.111.255
5710.91.112.0/2310.91.112.1 – 10.91.113.25410.91.113.255
5810.91.114.0/2310.91.114.1 – 10.91.115.25410.91.115.255
5910.91.116.0/2310.91.116.1 – 10.91.117.25410.91.117.255
6010.91.118.0/2310.91.118.1 – 10.91.119.25410.91.119.255
6110.91.120.0/2310.91.120.1 – 10.91.121.25410.91.121.255
6210.91.122.0/2310.91.122.1 – 10.91.123.25410.91.123.255
6310.91.124.0/2310.91.124.1 – 10.91.125.25410.91.125.255
6410.91.126.0/2310.91.126.1 – 10.91.127.25410.91.127.255
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 →