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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)10.8.0.0/17
network10.8.0.0/17
broadcast10.8.127.255
first host10.8.0.1
last host10.8.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.8.0.0/17
address00001010.00001000.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00001000.00000000.00000000
broadcast00001010.00001000.01111111.11111111
green = network part, grey = host part
hex0x0a080000
decimal168296448
reverse dns0.0.8.10.in-addr.arpa
ipv4-mapped::ffff:a08:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.8.0.0/2310.8.0.1 – 10.8.1.25410.8.1.255
210.8.2.0/2310.8.2.1 – 10.8.3.25410.8.3.255
310.8.4.0/2310.8.4.1 – 10.8.5.25410.8.5.255
410.8.6.0/2310.8.6.1 – 10.8.7.25410.8.7.255
510.8.8.0/2310.8.8.1 – 10.8.9.25410.8.9.255
610.8.10.0/2310.8.10.1 – 10.8.11.25410.8.11.255
710.8.12.0/2310.8.12.1 – 10.8.13.25410.8.13.255
810.8.14.0/2310.8.14.1 – 10.8.15.25410.8.15.255
910.8.16.0/2310.8.16.1 – 10.8.17.25410.8.17.255
1010.8.18.0/2310.8.18.1 – 10.8.19.25410.8.19.255
1110.8.20.0/2310.8.20.1 – 10.8.21.25410.8.21.255
1210.8.22.0/2310.8.22.1 – 10.8.23.25410.8.23.255
1310.8.24.0/2310.8.24.1 – 10.8.25.25410.8.25.255
1410.8.26.0/2310.8.26.1 – 10.8.27.25410.8.27.255
1510.8.28.0/2310.8.28.1 – 10.8.29.25410.8.29.255
1610.8.30.0/2310.8.30.1 – 10.8.31.25410.8.31.255
1710.8.32.0/2310.8.32.1 – 10.8.33.25410.8.33.255
1810.8.34.0/2310.8.34.1 – 10.8.35.25410.8.35.255
1910.8.36.0/2310.8.36.1 – 10.8.37.25410.8.37.255
2010.8.38.0/2310.8.38.1 – 10.8.39.25410.8.39.255
2110.8.40.0/2310.8.40.1 – 10.8.41.25410.8.41.255
2210.8.42.0/2310.8.42.1 – 10.8.43.25410.8.43.255
2310.8.44.0/2310.8.44.1 – 10.8.45.25410.8.45.255
2410.8.46.0/2310.8.46.1 – 10.8.47.25410.8.47.255
2510.8.48.0/2310.8.48.1 – 10.8.49.25410.8.49.255
2610.8.50.0/2310.8.50.1 – 10.8.51.25410.8.51.255
2710.8.52.0/2310.8.52.1 – 10.8.53.25410.8.53.255
2810.8.54.0/2310.8.54.1 – 10.8.55.25410.8.55.255
2910.8.56.0/2310.8.56.1 – 10.8.57.25410.8.57.255
3010.8.58.0/2310.8.58.1 – 10.8.59.25410.8.59.255
3110.8.60.0/2310.8.60.1 – 10.8.61.25410.8.61.255
3210.8.62.0/2310.8.62.1 – 10.8.63.25410.8.63.255
3310.8.64.0/2310.8.64.1 – 10.8.65.25410.8.65.255
3410.8.66.0/2310.8.66.1 – 10.8.67.25410.8.67.255
3510.8.68.0/2310.8.68.1 – 10.8.69.25410.8.69.255
3610.8.70.0/2310.8.70.1 – 10.8.71.25410.8.71.255
3710.8.72.0/2310.8.72.1 – 10.8.73.25410.8.73.255
3810.8.74.0/2310.8.74.1 – 10.8.75.25410.8.75.255
3910.8.76.0/2310.8.76.1 – 10.8.77.25410.8.77.255
4010.8.78.0/2310.8.78.1 – 10.8.79.25410.8.79.255
4110.8.80.0/2310.8.80.1 – 10.8.81.25410.8.81.255
4210.8.82.0/2310.8.82.1 – 10.8.83.25410.8.83.255
4310.8.84.0/2310.8.84.1 – 10.8.85.25410.8.85.255
4410.8.86.0/2310.8.86.1 – 10.8.87.25410.8.87.255
4510.8.88.0/2310.8.88.1 – 10.8.89.25410.8.89.255
4610.8.90.0/2310.8.90.1 – 10.8.91.25410.8.91.255
4710.8.92.0/2310.8.92.1 – 10.8.93.25410.8.93.255
4810.8.94.0/2310.8.94.1 – 10.8.95.25410.8.95.255
4910.8.96.0/2310.8.96.1 – 10.8.97.25410.8.97.255
5010.8.98.0/2310.8.98.1 – 10.8.99.25410.8.99.255
5110.8.100.0/2310.8.100.1 – 10.8.101.25410.8.101.255
5210.8.102.0/2310.8.102.1 – 10.8.103.25410.8.103.255
5310.8.104.0/2310.8.104.1 – 10.8.105.25410.8.105.255
5410.8.106.0/2310.8.106.1 – 10.8.107.25410.8.107.255
5510.8.108.0/2310.8.108.1 – 10.8.109.25410.8.109.255
5610.8.110.0/2310.8.110.1 – 10.8.111.25410.8.111.255
5710.8.112.0/2310.8.112.1 – 10.8.113.25410.8.113.255
5810.8.114.0/2310.8.114.1 – 10.8.115.25410.8.115.255
5910.8.116.0/2310.8.116.1 – 10.8.117.25410.8.117.255
6010.8.118.0/2310.8.118.1 – 10.8.119.25410.8.119.255
6110.8.120.0/2310.8.120.1 – 10.8.121.25410.8.121.255
6210.8.122.0/2310.8.122.1 – 10.8.123.25410.8.123.255
6310.8.124.0/2310.8.124.1 – 10.8.125.25410.8.125.255
6410.8.126.0/2310.8.126.1 – 10.8.127.25410.8.127.255
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 →