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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)10.166.0.0/17
network10.166.0.0/17
broadcast10.166.127.255
first host10.166.0.1
last host10.166.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.166.0.0/17
address00001010.10100110.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.10100110.00000000.00000000
broadcast00001010.10100110.01111111.11111111
green = network part, grey = host part
hex0x0aa60000
decimal178651136
reverse dns0.0.166.10.in-addr.arpa
ipv4-mapped::ffff:aa6:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.166.0.0/2310.166.0.1 – 10.166.1.25410.166.1.255
210.166.2.0/2310.166.2.1 – 10.166.3.25410.166.3.255
310.166.4.0/2310.166.4.1 – 10.166.5.25410.166.5.255
410.166.6.0/2310.166.6.1 – 10.166.7.25410.166.7.255
510.166.8.0/2310.166.8.1 – 10.166.9.25410.166.9.255
610.166.10.0/2310.166.10.1 – 10.166.11.25410.166.11.255
710.166.12.0/2310.166.12.1 – 10.166.13.25410.166.13.255
810.166.14.0/2310.166.14.1 – 10.166.15.25410.166.15.255
910.166.16.0/2310.166.16.1 – 10.166.17.25410.166.17.255
1010.166.18.0/2310.166.18.1 – 10.166.19.25410.166.19.255
1110.166.20.0/2310.166.20.1 – 10.166.21.25410.166.21.255
1210.166.22.0/2310.166.22.1 – 10.166.23.25410.166.23.255
1310.166.24.0/2310.166.24.1 – 10.166.25.25410.166.25.255
1410.166.26.0/2310.166.26.1 – 10.166.27.25410.166.27.255
1510.166.28.0/2310.166.28.1 – 10.166.29.25410.166.29.255
1610.166.30.0/2310.166.30.1 – 10.166.31.25410.166.31.255
1710.166.32.0/2310.166.32.1 – 10.166.33.25410.166.33.255
1810.166.34.0/2310.166.34.1 – 10.166.35.25410.166.35.255
1910.166.36.0/2310.166.36.1 – 10.166.37.25410.166.37.255
2010.166.38.0/2310.166.38.1 – 10.166.39.25410.166.39.255
2110.166.40.0/2310.166.40.1 – 10.166.41.25410.166.41.255
2210.166.42.0/2310.166.42.1 – 10.166.43.25410.166.43.255
2310.166.44.0/2310.166.44.1 – 10.166.45.25410.166.45.255
2410.166.46.0/2310.166.46.1 – 10.166.47.25410.166.47.255
2510.166.48.0/2310.166.48.1 – 10.166.49.25410.166.49.255
2610.166.50.0/2310.166.50.1 – 10.166.51.25410.166.51.255
2710.166.52.0/2310.166.52.1 – 10.166.53.25410.166.53.255
2810.166.54.0/2310.166.54.1 – 10.166.55.25410.166.55.255
2910.166.56.0/2310.166.56.1 – 10.166.57.25410.166.57.255
3010.166.58.0/2310.166.58.1 – 10.166.59.25410.166.59.255
3110.166.60.0/2310.166.60.1 – 10.166.61.25410.166.61.255
3210.166.62.0/2310.166.62.1 – 10.166.63.25410.166.63.255
3310.166.64.0/2310.166.64.1 – 10.166.65.25410.166.65.255
3410.166.66.0/2310.166.66.1 – 10.166.67.25410.166.67.255
3510.166.68.0/2310.166.68.1 – 10.166.69.25410.166.69.255
3610.166.70.0/2310.166.70.1 – 10.166.71.25410.166.71.255
3710.166.72.0/2310.166.72.1 – 10.166.73.25410.166.73.255
3810.166.74.0/2310.166.74.1 – 10.166.75.25410.166.75.255
3910.166.76.0/2310.166.76.1 – 10.166.77.25410.166.77.255
4010.166.78.0/2310.166.78.1 – 10.166.79.25410.166.79.255
4110.166.80.0/2310.166.80.1 – 10.166.81.25410.166.81.255
4210.166.82.0/2310.166.82.1 – 10.166.83.25410.166.83.255
4310.166.84.0/2310.166.84.1 – 10.166.85.25410.166.85.255
4410.166.86.0/2310.166.86.1 – 10.166.87.25410.166.87.255
4510.166.88.0/2310.166.88.1 – 10.166.89.25410.166.89.255
4610.166.90.0/2310.166.90.1 – 10.166.91.25410.166.91.255
4710.166.92.0/2310.166.92.1 – 10.166.93.25410.166.93.255
4810.166.94.0/2310.166.94.1 – 10.166.95.25410.166.95.255
4910.166.96.0/2310.166.96.1 – 10.166.97.25410.166.97.255
5010.166.98.0/2310.166.98.1 – 10.166.99.25410.166.99.255
5110.166.100.0/2310.166.100.1 – 10.166.101.25410.166.101.255
5210.166.102.0/2310.166.102.1 – 10.166.103.25410.166.103.255
5310.166.104.0/2310.166.104.1 – 10.166.105.25410.166.105.255
5410.166.106.0/2310.166.106.1 – 10.166.107.25410.166.107.255
5510.166.108.0/2310.166.108.1 – 10.166.109.25410.166.109.255
5610.166.110.0/2310.166.110.1 – 10.166.111.25410.166.111.255
5710.166.112.0/2310.166.112.1 – 10.166.113.25410.166.113.255
5810.166.114.0/2310.166.114.1 – 10.166.115.25410.166.115.255
5910.166.116.0/2310.166.116.1 – 10.166.117.25410.166.117.255
6010.166.118.0/2310.166.118.1 – 10.166.119.25410.166.119.255
6110.166.120.0/2310.166.120.1 – 10.166.121.25410.166.121.255
6210.166.122.0/2310.166.122.1 – 10.166.123.25410.166.123.255
6310.166.124.0/2310.166.124.1 – 10.166.125.25410.166.125.255
6410.166.126.0/2310.166.126.1 – 10.166.127.25410.166.127.255
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 →