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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)10.127.0.0/17
network10.127.0.0/17
broadcast10.127.127.255
first host10.127.0.1
last host10.127.127.254
subnet mask255.255.128.0
wildcard0.0.127.255
addresses32,768
usable hosts32,766
classA
ipcalc 10.127.0.0/17
address00001010.01111111.00000000.00000000
subnet mask11111111.11111111.10000000.00000000
network00001010.01111111.00000000.00000000
broadcast00001010.01111111.01111111.11111111
green = network part, grey = host part
hex0x0a7f0000
decimal176095232
reverse dns0.0.127.10.in-addr.arpa
ipv4-mapped::ffff:a7f:0

/17 split into /23 · 64 subnets

close ×
#networkhost rangebroadcast
110.127.0.0/2310.127.0.1 – 10.127.1.25410.127.1.255
210.127.2.0/2310.127.2.1 – 10.127.3.25410.127.3.255
310.127.4.0/2310.127.4.1 – 10.127.5.25410.127.5.255
410.127.6.0/2310.127.6.1 – 10.127.7.25410.127.7.255
510.127.8.0/2310.127.8.1 – 10.127.9.25410.127.9.255
610.127.10.0/2310.127.10.1 – 10.127.11.25410.127.11.255
710.127.12.0/2310.127.12.1 – 10.127.13.25410.127.13.255
810.127.14.0/2310.127.14.1 – 10.127.15.25410.127.15.255
910.127.16.0/2310.127.16.1 – 10.127.17.25410.127.17.255
1010.127.18.0/2310.127.18.1 – 10.127.19.25410.127.19.255
1110.127.20.0/2310.127.20.1 – 10.127.21.25410.127.21.255
1210.127.22.0/2310.127.22.1 – 10.127.23.25410.127.23.255
1310.127.24.0/2310.127.24.1 – 10.127.25.25410.127.25.255
1410.127.26.0/2310.127.26.1 – 10.127.27.25410.127.27.255
1510.127.28.0/2310.127.28.1 – 10.127.29.25410.127.29.255
1610.127.30.0/2310.127.30.1 – 10.127.31.25410.127.31.255
1710.127.32.0/2310.127.32.1 – 10.127.33.25410.127.33.255
1810.127.34.0/2310.127.34.1 – 10.127.35.25410.127.35.255
1910.127.36.0/2310.127.36.1 – 10.127.37.25410.127.37.255
2010.127.38.0/2310.127.38.1 – 10.127.39.25410.127.39.255
2110.127.40.0/2310.127.40.1 – 10.127.41.25410.127.41.255
2210.127.42.0/2310.127.42.1 – 10.127.43.25410.127.43.255
2310.127.44.0/2310.127.44.1 – 10.127.45.25410.127.45.255
2410.127.46.0/2310.127.46.1 – 10.127.47.25410.127.47.255
2510.127.48.0/2310.127.48.1 – 10.127.49.25410.127.49.255
2610.127.50.0/2310.127.50.1 – 10.127.51.25410.127.51.255
2710.127.52.0/2310.127.52.1 – 10.127.53.25410.127.53.255
2810.127.54.0/2310.127.54.1 – 10.127.55.25410.127.55.255
2910.127.56.0/2310.127.56.1 – 10.127.57.25410.127.57.255
3010.127.58.0/2310.127.58.1 – 10.127.59.25410.127.59.255
3110.127.60.0/2310.127.60.1 – 10.127.61.25410.127.61.255
3210.127.62.0/2310.127.62.1 – 10.127.63.25410.127.63.255
3310.127.64.0/2310.127.64.1 – 10.127.65.25410.127.65.255
3410.127.66.0/2310.127.66.1 – 10.127.67.25410.127.67.255
3510.127.68.0/2310.127.68.1 – 10.127.69.25410.127.69.255
3610.127.70.0/2310.127.70.1 – 10.127.71.25410.127.71.255
3710.127.72.0/2310.127.72.1 – 10.127.73.25410.127.73.255
3810.127.74.0/2310.127.74.1 – 10.127.75.25410.127.75.255
3910.127.76.0/2310.127.76.1 – 10.127.77.25410.127.77.255
4010.127.78.0/2310.127.78.1 – 10.127.79.25410.127.79.255
4110.127.80.0/2310.127.80.1 – 10.127.81.25410.127.81.255
4210.127.82.0/2310.127.82.1 – 10.127.83.25410.127.83.255
4310.127.84.0/2310.127.84.1 – 10.127.85.25410.127.85.255
4410.127.86.0/2310.127.86.1 – 10.127.87.25410.127.87.255
4510.127.88.0/2310.127.88.1 – 10.127.89.25410.127.89.255
4610.127.90.0/2310.127.90.1 – 10.127.91.25410.127.91.255
4710.127.92.0/2310.127.92.1 – 10.127.93.25410.127.93.255
4810.127.94.0/2310.127.94.1 – 10.127.95.25410.127.95.255
4910.127.96.0/2310.127.96.1 – 10.127.97.25410.127.97.255
5010.127.98.0/2310.127.98.1 – 10.127.99.25410.127.99.255
5110.127.100.0/2310.127.100.1 – 10.127.101.25410.127.101.255
5210.127.102.0/2310.127.102.1 – 10.127.103.25410.127.103.255
5310.127.104.0/2310.127.104.1 – 10.127.105.25410.127.105.255
5410.127.106.0/2310.127.106.1 – 10.127.107.25410.127.107.255
5510.127.108.0/2310.127.108.1 – 10.127.109.25410.127.109.255
5610.127.110.0/2310.127.110.1 – 10.127.111.25410.127.111.255
5710.127.112.0/2310.127.112.1 – 10.127.113.25410.127.113.255
5810.127.114.0/2310.127.114.1 – 10.127.115.25410.127.115.255
5910.127.116.0/2310.127.116.1 – 10.127.117.25410.127.117.255
6010.127.118.0/2310.127.118.1 – 10.127.119.25410.127.119.255
6110.127.120.0/2310.127.120.1 – 10.127.121.25410.127.121.255
6210.127.122.0/2310.127.122.1 – 10.127.123.25410.127.123.255
6310.127.124.0/2310.127.124.1 – 10.127.125.25410.127.125.255
6410.127.126.0/2310.127.126.1 – 10.127.127.25410.127.127.255
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 →