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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)10.71.0.0/17
network10.71.0.0/17
broadcast10.71.127.255
first host10.71.0.1
last host10.71.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.71.0.0/17
address00001010.01000111.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01000111.00000000.00000000
broadcast00001010.01000111.01111111.11111111
green = network part, grey = host part
hex0x0a470000
decimal172425216
reverse dns0.0.71.10.in-addr.arpa
ipv4-mapped::ffff:a47:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.71.0.0/2310.71.0.1 – 10.71.1.25410.71.1.255
210.71.2.0/2310.71.2.1 – 10.71.3.25410.71.3.255
310.71.4.0/2310.71.4.1 – 10.71.5.25410.71.5.255
410.71.6.0/2310.71.6.1 – 10.71.7.25410.71.7.255
510.71.8.0/2310.71.8.1 – 10.71.9.25410.71.9.255
610.71.10.0/2310.71.10.1 – 10.71.11.25410.71.11.255
710.71.12.0/2310.71.12.1 – 10.71.13.25410.71.13.255
810.71.14.0/2310.71.14.1 – 10.71.15.25410.71.15.255
910.71.16.0/2310.71.16.1 – 10.71.17.25410.71.17.255
1010.71.18.0/2310.71.18.1 – 10.71.19.25410.71.19.255
1110.71.20.0/2310.71.20.1 – 10.71.21.25410.71.21.255
1210.71.22.0/2310.71.22.1 – 10.71.23.25410.71.23.255
1310.71.24.0/2310.71.24.1 – 10.71.25.25410.71.25.255
1410.71.26.0/2310.71.26.1 – 10.71.27.25410.71.27.255
1510.71.28.0/2310.71.28.1 – 10.71.29.25410.71.29.255
1610.71.30.0/2310.71.30.1 – 10.71.31.25410.71.31.255
1710.71.32.0/2310.71.32.1 – 10.71.33.25410.71.33.255
1810.71.34.0/2310.71.34.1 – 10.71.35.25410.71.35.255
1910.71.36.0/2310.71.36.1 – 10.71.37.25410.71.37.255
2010.71.38.0/2310.71.38.1 – 10.71.39.25410.71.39.255
2110.71.40.0/2310.71.40.1 – 10.71.41.25410.71.41.255
2210.71.42.0/2310.71.42.1 – 10.71.43.25410.71.43.255
2310.71.44.0/2310.71.44.1 – 10.71.45.25410.71.45.255
2410.71.46.0/2310.71.46.1 – 10.71.47.25410.71.47.255
2510.71.48.0/2310.71.48.1 – 10.71.49.25410.71.49.255
2610.71.50.0/2310.71.50.1 – 10.71.51.25410.71.51.255
2710.71.52.0/2310.71.52.1 – 10.71.53.25410.71.53.255
2810.71.54.0/2310.71.54.1 – 10.71.55.25410.71.55.255
2910.71.56.0/2310.71.56.1 – 10.71.57.25410.71.57.255
3010.71.58.0/2310.71.58.1 – 10.71.59.25410.71.59.255
3110.71.60.0/2310.71.60.1 – 10.71.61.25410.71.61.255
3210.71.62.0/2310.71.62.1 – 10.71.63.25410.71.63.255
3310.71.64.0/2310.71.64.1 – 10.71.65.25410.71.65.255
3410.71.66.0/2310.71.66.1 – 10.71.67.25410.71.67.255
3510.71.68.0/2310.71.68.1 – 10.71.69.25410.71.69.255
3610.71.70.0/2310.71.70.1 – 10.71.71.25410.71.71.255
3710.71.72.0/2310.71.72.1 – 10.71.73.25410.71.73.255
3810.71.74.0/2310.71.74.1 – 10.71.75.25410.71.75.255
3910.71.76.0/2310.71.76.1 – 10.71.77.25410.71.77.255
4010.71.78.0/2310.71.78.1 – 10.71.79.25410.71.79.255
4110.71.80.0/2310.71.80.1 – 10.71.81.25410.71.81.255
4210.71.82.0/2310.71.82.1 – 10.71.83.25410.71.83.255
4310.71.84.0/2310.71.84.1 – 10.71.85.25410.71.85.255
4410.71.86.0/2310.71.86.1 – 10.71.87.25410.71.87.255
4510.71.88.0/2310.71.88.1 – 10.71.89.25410.71.89.255
4610.71.90.0/2310.71.90.1 – 10.71.91.25410.71.91.255
4710.71.92.0/2310.71.92.1 – 10.71.93.25410.71.93.255
4810.71.94.0/2310.71.94.1 – 10.71.95.25410.71.95.255
4910.71.96.0/2310.71.96.1 – 10.71.97.25410.71.97.255
5010.71.98.0/2310.71.98.1 – 10.71.99.25410.71.99.255
5110.71.100.0/2310.71.100.1 – 10.71.101.25410.71.101.255
5210.71.102.0/2310.71.102.1 – 10.71.103.25410.71.103.255
5310.71.104.0/2310.71.104.1 – 10.71.105.25410.71.105.255
5410.71.106.0/2310.71.106.1 – 10.71.107.25410.71.107.255
5510.71.108.0/2310.71.108.1 – 10.71.109.25410.71.109.255
5610.71.110.0/2310.71.110.1 – 10.71.111.25410.71.111.255
5710.71.112.0/2310.71.112.1 – 10.71.113.25410.71.113.255
5810.71.114.0/2310.71.114.1 – 10.71.115.25410.71.115.255
5910.71.116.0/2310.71.116.1 – 10.71.117.25410.71.117.255
6010.71.118.0/2310.71.118.1 – 10.71.119.25410.71.119.255
6110.71.120.0/2310.71.120.1 – 10.71.121.25410.71.121.255
6210.71.122.0/2310.71.122.1 – 10.71.123.25410.71.123.255
6310.71.124.0/2310.71.124.1 – 10.71.125.25410.71.125.255
6410.71.126.0/2310.71.126.1 – 10.71.127.25410.71.127.255
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 →