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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)10.120.0.0/17
network10.120.0.0/17
broadcast10.120.127.255
first host10.120.0.1
last host10.120.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.120.0.0/17
address00001010.01111000.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01111000.00000000.00000000
broadcast00001010.01111000.01111111.11111111
green = network part, grey = host part
hex0x0a780000
decimal175636480
reverse dns0.0.120.10.in-addr.arpa
ipv4-mapped::ffff:a78:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.120.0.0/2310.120.0.1 – 10.120.1.25410.120.1.255
210.120.2.0/2310.120.2.1 – 10.120.3.25410.120.3.255
310.120.4.0/2310.120.4.1 – 10.120.5.25410.120.5.255
410.120.6.0/2310.120.6.1 – 10.120.7.25410.120.7.255
510.120.8.0/2310.120.8.1 – 10.120.9.25410.120.9.255
610.120.10.0/2310.120.10.1 – 10.120.11.25410.120.11.255
710.120.12.0/2310.120.12.1 – 10.120.13.25410.120.13.255
810.120.14.0/2310.120.14.1 – 10.120.15.25410.120.15.255
910.120.16.0/2310.120.16.1 – 10.120.17.25410.120.17.255
1010.120.18.0/2310.120.18.1 – 10.120.19.25410.120.19.255
1110.120.20.0/2310.120.20.1 – 10.120.21.25410.120.21.255
1210.120.22.0/2310.120.22.1 – 10.120.23.25410.120.23.255
1310.120.24.0/2310.120.24.1 – 10.120.25.25410.120.25.255
1410.120.26.0/2310.120.26.1 – 10.120.27.25410.120.27.255
1510.120.28.0/2310.120.28.1 – 10.120.29.25410.120.29.255
1610.120.30.0/2310.120.30.1 – 10.120.31.25410.120.31.255
1710.120.32.0/2310.120.32.1 – 10.120.33.25410.120.33.255
1810.120.34.0/2310.120.34.1 – 10.120.35.25410.120.35.255
1910.120.36.0/2310.120.36.1 – 10.120.37.25410.120.37.255
2010.120.38.0/2310.120.38.1 – 10.120.39.25410.120.39.255
2110.120.40.0/2310.120.40.1 – 10.120.41.25410.120.41.255
2210.120.42.0/2310.120.42.1 – 10.120.43.25410.120.43.255
2310.120.44.0/2310.120.44.1 – 10.120.45.25410.120.45.255
2410.120.46.0/2310.120.46.1 – 10.120.47.25410.120.47.255
2510.120.48.0/2310.120.48.1 – 10.120.49.25410.120.49.255
2610.120.50.0/2310.120.50.1 – 10.120.51.25410.120.51.255
2710.120.52.0/2310.120.52.1 – 10.120.53.25410.120.53.255
2810.120.54.0/2310.120.54.1 – 10.120.55.25410.120.55.255
2910.120.56.0/2310.120.56.1 – 10.120.57.25410.120.57.255
3010.120.58.0/2310.120.58.1 – 10.120.59.25410.120.59.255
3110.120.60.0/2310.120.60.1 – 10.120.61.25410.120.61.255
3210.120.62.0/2310.120.62.1 – 10.120.63.25410.120.63.255
3310.120.64.0/2310.120.64.1 – 10.120.65.25410.120.65.255
3410.120.66.0/2310.120.66.1 – 10.120.67.25410.120.67.255
3510.120.68.0/2310.120.68.1 – 10.120.69.25410.120.69.255
3610.120.70.0/2310.120.70.1 – 10.120.71.25410.120.71.255
3710.120.72.0/2310.120.72.1 – 10.120.73.25410.120.73.255
3810.120.74.0/2310.120.74.1 – 10.120.75.25410.120.75.255
3910.120.76.0/2310.120.76.1 – 10.120.77.25410.120.77.255
4010.120.78.0/2310.120.78.1 – 10.120.79.25410.120.79.255
4110.120.80.0/2310.120.80.1 – 10.120.81.25410.120.81.255
4210.120.82.0/2310.120.82.1 – 10.120.83.25410.120.83.255
4310.120.84.0/2310.120.84.1 – 10.120.85.25410.120.85.255
4410.120.86.0/2310.120.86.1 – 10.120.87.25410.120.87.255
4510.120.88.0/2310.120.88.1 – 10.120.89.25410.120.89.255
4610.120.90.0/2310.120.90.1 – 10.120.91.25410.120.91.255
4710.120.92.0/2310.120.92.1 – 10.120.93.25410.120.93.255
4810.120.94.0/2310.120.94.1 – 10.120.95.25410.120.95.255
4910.120.96.0/2310.120.96.1 – 10.120.97.25410.120.97.255
5010.120.98.0/2310.120.98.1 – 10.120.99.25410.120.99.255
5110.120.100.0/2310.120.100.1 – 10.120.101.25410.120.101.255
5210.120.102.0/2310.120.102.1 – 10.120.103.25410.120.103.255
5310.120.104.0/2310.120.104.1 – 10.120.105.25410.120.105.255
5410.120.106.0/2310.120.106.1 – 10.120.107.25410.120.107.255
5510.120.108.0/2310.120.108.1 – 10.120.109.25410.120.109.255
5610.120.110.0/2310.120.110.1 – 10.120.111.25410.120.111.255
5710.120.112.0/2310.120.112.1 – 10.120.113.25410.120.113.255
5810.120.114.0/2310.120.114.1 – 10.120.115.25410.120.115.255
5910.120.116.0/2310.120.116.1 – 10.120.117.25410.120.117.255
6010.120.118.0/2310.120.118.1 – 10.120.119.25410.120.119.255
6110.120.120.0/2310.120.120.1 – 10.120.121.25410.120.121.255
6210.120.122.0/2310.120.122.1 – 10.120.123.25410.120.123.255
6310.120.124.0/2310.120.124.1 – 10.120.125.25410.120.125.255
6410.120.126.0/2310.120.126.1 – 10.120.127.25410.120.127.255
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 →