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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)10.12.64.0/19
network10.12.64.0/19
broadcast10.12.95.255
first host10.12.64.1
last host10.12.95.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.12.64.0/19
address00001010.00001100.01000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00001100.01000000.00000000
broadcast00001010.00001100.01011111.11111111
green = network part, grey = host part
hex0x0a0c4000
decimal168574976
reverse dns0.64.12.10.in-addr.arpa
ipv4-mapped::ffff:a0c:4000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.12.64.0/2510.12.64.1 – 10.12.64.12610.12.64.127
210.12.64.128/2510.12.64.129 – 10.12.64.25410.12.64.255
310.12.65.0/2510.12.65.1 – 10.12.65.12610.12.65.127
410.12.65.128/2510.12.65.129 – 10.12.65.25410.12.65.255
510.12.66.0/2510.12.66.1 – 10.12.66.12610.12.66.127
610.12.66.128/2510.12.66.129 – 10.12.66.25410.12.66.255
710.12.67.0/2510.12.67.1 – 10.12.67.12610.12.67.127
810.12.67.128/2510.12.67.129 – 10.12.67.25410.12.67.255
910.12.68.0/2510.12.68.1 – 10.12.68.12610.12.68.127
1010.12.68.128/2510.12.68.129 – 10.12.68.25410.12.68.255
1110.12.69.0/2510.12.69.1 – 10.12.69.12610.12.69.127
1210.12.69.128/2510.12.69.129 – 10.12.69.25410.12.69.255
1310.12.70.0/2510.12.70.1 – 10.12.70.12610.12.70.127
1410.12.70.128/2510.12.70.129 – 10.12.70.25410.12.70.255
1510.12.71.0/2510.12.71.1 – 10.12.71.12610.12.71.127
1610.12.71.128/2510.12.71.129 – 10.12.71.25410.12.71.255
1710.12.72.0/2510.12.72.1 – 10.12.72.12610.12.72.127
1810.12.72.128/2510.12.72.129 – 10.12.72.25410.12.72.255
1910.12.73.0/2510.12.73.1 – 10.12.73.12610.12.73.127
2010.12.73.128/2510.12.73.129 – 10.12.73.25410.12.73.255
2110.12.74.0/2510.12.74.1 – 10.12.74.12610.12.74.127
2210.12.74.128/2510.12.74.129 – 10.12.74.25410.12.74.255
2310.12.75.0/2510.12.75.1 – 10.12.75.12610.12.75.127
2410.12.75.128/2510.12.75.129 – 10.12.75.25410.12.75.255
2510.12.76.0/2510.12.76.1 – 10.12.76.12610.12.76.127
2610.12.76.128/2510.12.76.129 – 10.12.76.25410.12.76.255
2710.12.77.0/2510.12.77.1 – 10.12.77.12610.12.77.127
2810.12.77.128/2510.12.77.129 – 10.12.77.25410.12.77.255
2910.12.78.0/2510.12.78.1 – 10.12.78.12610.12.78.127
3010.12.78.128/2510.12.78.129 – 10.12.78.25410.12.78.255
3110.12.79.0/2510.12.79.1 – 10.12.79.12610.12.79.127
3210.12.79.128/2510.12.79.129 – 10.12.79.25410.12.79.255
3310.12.80.0/2510.12.80.1 – 10.12.80.12610.12.80.127
3410.12.80.128/2510.12.80.129 – 10.12.80.25410.12.80.255
3510.12.81.0/2510.12.81.1 – 10.12.81.12610.12.81.127
3610.12.81.128/2510.12.81.129 – 10.12.81.25410.12.81.255
3710.12.82.0/2510.12.82.1 – 10.12.82.12610.12.82.127
3810.12.82.128/2510.12.82.129 – 10.12.82.25410.12.82.255
3910.12.83.0/2510.12.83.1 – 10.12.83.12610.12.83.127
4010.12.83.128/2510.12.83.129 – 10.12.83.25410.12.83.255
4110.12.84.0/2510.12.84.1 – 10.12.84.12610.12.84.127
4210.12.84.128/2510.12.84.129 – 10.12.84.25410.12.84.255
4310.12.85.0/2510.12.85.1 – 10.12.85.12610.12.85.127
4410.12.85.128/2510.12.85.129 – 10.12.85.25410.12.85.255
4510.12.86.0/2510.12.86.1 – 10.12.86.12610.12.86.127
4610.12.86.128/2510.12.86.129 – 10.12.86.25410.12.86.255
4710.12.87.0/2510.12.87.1 – 10.12.87.12610.12.87.127
4810.12.87.128/2510.12.87.129 – 10.12.87.25410.12.87.255
4910.12.88.0/2510.12.88.1 – 10.12.88.12610.12.88.127
5010.12.88.128/2510.12.88.129 – 10.12.88.25410.12.88.255
5110.12.89.0/2510.12.89.1 – 10.12.89.12610.12.89.127
5210.12.89.128/2510.12.89.129 – 10.12.89.25410.12.89.255
5310.12.90.0/2510.12.90.1 – 10.12.90.12610.12.90.127
5410.12.90.128/2510.12.90.129 – 10.12.90.25410.12.90.255
5510.12.91.0/2510.12.91.1 – 10.12.91.12610.12.91.127
5610.12.91.128/2510.12.91.129 – 10.12.91.25410.12.91.255
5710.12.92.0/2510.12.92.1 – 10.12.92.12610.12.92.127
5810.12.92.128/2510.12.92.129 – 10.12.92.25410.12.92.255
5910.12.93.0/2510.12.93.1 – 10.12.93.12610.12.93.127
6010.12.93.128/2510.12.93.129 – 10.12.93.25410.12.93.255
6110.12.94.0/2510.12.94.1 – 10.12.94.12610.12.94.127
6210.12.94.128/2510.12.94.129 – 10.12.94.25410.12.94.255
6310.12.95.0/2510.12.95.1 – 10.12.95.12610.12.95.127
6410.12.95.128/2510.12.95.129 – 10.12.95.25410.12.95.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /19
/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-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,1901
/20255.255.240.04,0964,0942 split →
/21255.255.248.02,0482,0464 split →
/22255.255.252.01,0241,0228 split →
/23255.255.254.051251016 split →
/24255.255.255.025625432 split →
/25255.255.255.12812812664 split →
/26255.255.255.1926462128 split →
/27255.255.255.2243230256 split →
/28255.255.255.2401614512 split →
/29255.255.255.248861,024 split →
/30255.255.255.252422,048 split →
/31255.255.255.254224,096 split →
/32255.255.255.255118,192 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 →