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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)10.54.0.0/17
network10.54.0.0/17
broadcast10.54.127.255
first host10.54.0.1
last host10.54.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.54.0.0/17
address00001010.00110110.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.00110110.00000000.00000000
broadcast00001010.00110110.01111111.11111111
green = network part, grey = host part
hex0x0a360000
decimal171311104
reverse dns0.0.54.10.in-addr.arpa
ipv4-mapped::ffff:a36:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.54.0.0/2310.54.0.1 – 10.54.1.25410.54.1.255
210.54.2.0/2310.54.2.1 – 10.54.3.25410.54.3.255
310.54.4.0/2310.54.4.1 – 10.54.5.25410.54.5.255
410.54.6.0/2310.54.6.1 – 10.54.7.25410.54.7.255
510.54.8.0/2310.54.8.1 – 10.54.9.25410.54.9.255
610.54.10.0/2310.54.10.1 – 10.54.11.25410.54.11.255
710.54.12.0/2310.54.12.1 – 10.54.13.25410.54.13.255
810.54.14.0/2310.54.14.1 – 10.54.15.25410.54.15.255
910.54.16.0/2310.54.16.1 – 10.54.17.25410.54.17.255
1010.54.18.0/2310.54.18.1 – 10.54.19.25410.54.19.255
1110.54.20.0/2310.54.20.1 – 10.54.21.25410.54.21.255
1210.54.22.0/2310.54.22.1 – 10.54.23.25410.54.23.255
1310.54.24.0/2310.54.24.1 – 10.54.25.25410.54.25.255
1410.54.26.0/2310.54.26.1 – 10.54.27.25410.54.27.255
1510.54.28.0/2310.54.28.1 – 10.54.29.25410.54.29.255
1610.54.30.0/2310.54.30.1 – 10.54.31.25410.54.31.255
1710.54.32.0/2310.54.32.1 – 10.54.33.25410.54.33.255
1810.54.34.0/2310.54.34.1 – 10.54.35.25410.54.35.255
1910.54.36.0/2310.54.36.1 – 10.54.37.25410.54.37.255
2010.54.38.0/2310.54.38.1 – 10.54.39.25410.54.39.255
2110.54.40.0/2310.54.40.1 – 10.54.41.25410.54.41.255
2210.54.42.0/2310.54.42.1 – 10.54.43.25410.54.43.255
2310.54.44.0/2310.54.44.1 – 10.54.45.25410.54.45.255
2410.54.46.0/2310.54.46.1 – 10.54.47.25410.54.47.255
2510.54.48.0/2310.54.48.1 – 10.54.49.25410.54.49.255
2610.54.50.0/2310.54.50.1 – 10.54.51.25410.54.51.255
2710.54.52.0/2310.54.52.1 – 10.54.53.25410.54.53.255
2810.54.54.0/2310.54.54.1 – 10.54.55.25410.54.55.255
2910.54.56.0/2310.54.56.1 – 10.54.57.25410.54.57.255
3010.54.58.0/2310.54.58.1 – 10.54.59.25410.54.59.255
3110.54.60.0/2310.54.60.1 – 10.54.61.25410.54.61.255
3210.54.62.0/2310.54.62.1 – 10.54.63.25410.54.63.255
3310.54.64.0/2310.54.64.1 – 10.54.65.25410.54.65.255
3410.54.66.0/2310.54.66.1 – 10.54.67.25410.54.67.255
3510.54.68.0/2310.54.68.1 – 10.54.69.25410.54.69.255
3610.54.70.0/2310.54.70.1 – 10.54.71.25410.54.71.255
3710.54.72.0/2310.54.72.1 – 10.54.73.25410.54.73.255
3810.54.74.0/2310.54.74.1 – 10.54.75.25410.54.75.255
3910.54.76.0/2310.54.76.1 – 10.54.77.25410.54.77.255
4010.54.78.0/2310.54.78.1 – 10.54.79.25410.54.79.255
4110.54.80.0/2310.54.80.1 – 10.54.81.25410.54.81.255
4210.54.82.0/2310.54.82.1 – 10.54.83.25410.54.83.255
4310.54.84.0/2310.54.84.1 – 10.54.85.25410.54.85.255
4410.54.86.0/2310.54.86.1 – 10.54.87.25410.54.87.255
4510.54.88.0/2310.54.88.1 – 10.54.89.25410.54.89.255
4610.54.90.0/2310.54.90.1 – 10.54.91.25410.54.91.255
4710.54.92.0/2310.54.92.1 – 10.54.93.25410.54.93.255
4810.54.94.0/2310.54.94.1 – 10.54.95.25410.54.95.255
4910.54.96.0/2310.54.96.1 – 10.54.97.25410.54.97.255
5010.54.98.0/2310.54.98.1 – 10.54.99.25410.54.99.255
5110.54.100.0/2310.54.100.1 – 10.54.101.25410.54.101.255
5210.54.102.0/2310.54.102.1 – 10.54.103.25410.54.103.255
5310.54.104.0/2310.54.104.1 – 10.54.105.25410.54.105.255
5410.54.106.0/2310.54.106.1 – 10.54.107.25410.54.107.255
5510.54.108.0/2310.54.108.1 – 10.54.109.25410.54.109.255
5610.54.110.0/2310.54.110.1 – 10.54.111.25410.54.111.255
5710.54.112.0/2310.54.112.1 – 10.54.113.25410.54.113.255
5810.54.114.0/2310.54.114.1 – 10.54.115.25410.54.115.255
5910.54.116.0/2310.54.116.1 – 10.54.117.25410.54.117.255
6010.54.118.0/2310.54.118.1 – 10.54.119.25410.54.119.255
6110.54.120.0/2310.54.120.1 – 10.54.121.25410.54.121.255
6210.54.122.0/2310.54.122.1 – 10.54.123.25410.54.123.255
6310.54.124.0/2310.54.124.1 – 10.54.125.25410.54.125.255
6410.54.126.0/2310.54.126.1 – 10.54.127.25410.54.127.255
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 →