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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)10.19.64.0/19
network10.19.64.0/19
broadcast10.19.95.255
first host10.19.64.1
last host10.19.95.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.19.64.0/19
address00001010.00010011.01000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010011.01000000.00000000
broadcast00001010.00010011.01011111.11111111
green = network part, grey = host part
hex0x0a134000
decimal169033728
reverse dns0.64.19.10.in-addr.arpa
ipv4-mapped::ffff:a13:4000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.19.64.0/2510.19.64.1 – 10.19.64.12610.19.64.127
210.19.64.128/2510.19.64.129 – 10.19.64.25410.19.64.255
310.19.65.0/2510.19.65.1 – 10.19.65.12610.19.65.127
410.19.65.128/2510.19.65.129 – 10.19.65.25410.19.65.255
510.19.66.0/2510.19.66.1 – 10.19.66.12610.19.66.127
610.19.66.128/2510.19.66.129 – 10.19.66.25410.19.66.255
710.19.67.0/2510.19.67.1 – 10.19.67.12610.19.67.127
810.19.67.128/2510.19.67.129 – 10.19.67.25410.19.67.255
910.19.68.0/2510.19.68.1 – 10.19.68.12610.19.68.127
1010.19.68.128/2510.19.68.129 – 10.19.68.25410.19.68.255
1110.19.69.0/2510.19.69.1 – 10.19.69.12610.19.69.127
1210.19.69.128/2510.19.69.129 – 10.19.69.25410.19.69.255
1310.19.70.0/2510.19.70.1 – 10.19.70.12610.19.70.127
1410.19.70.128/2510.19.70.129 – 10.19.70.25410.19.70.255
1510.19.71.0/2510.19.71.1 – 10.19.71.12610.19.71.127
1610.19.71.128/2510.19.71.129 – 10.19.71.25410.19.71.255
1710.19.72.0/2510.19.72.1 – 10.19.72.12610.19.72.127
1810.19.72.128/2510.19.72.129 – 10.19.72.25410.19.72.255
1910.19.73.0/2510.19.73.1 – 10.19.73.12610.19.73.127
2010.19.73.128/2510.19.73.129 – 10.19.73.25410.19.73.255
2110.19.74.0/2510.19.74.1 – 10.19.74.12610.19.74.127
2210.19.74.128/2510.19.74.129 – 10.19.74.25410.19.74.255
2310.19.75.0/2510.19.75.1 – 10.19.75.12610.19.75.127
2410.19.75.128/2510.19.75.129 – 10.19.75.25410.19.75.255
2510.19.76.0/2510.19.76.1 – 10.19.76.12610.19.76.127
2610.19.76.128/2510.19.76.129 – 10.19.76.25410.19.76.255
2710.19.77.0/2510.19.77.1 – 10.19.77.12610.19.77.127
2810.19.77.128/2510.19.77.129 – 10.19.77.25410.19.77.255
2910.19.78.0/2510.19.78.1 – 10.19.78.12610.19.78.127
3010.19.78.128/2510.19.78.129 – 10.19.78.25410.19.78.255
3110.19.79.0/2510.19.79.1 – 10.19.79.12610.19.79.127
3210.19.79.128/2510.19.79.129 – 10.19.79.25410.19.79.255
3310.19.80.0/2510.19.80.1 – 10.19.80.12610.19.80.127
3410.19.80.128/2510.19.80.129 – 10.19.80.25410.19.80.255
3510.19.81.0/2510.19.81.1 – 10.19.81.12610.19.81.127
3610.19.81.128/2510.19.81.129 – 10.19.81.25410.19.81.255
3710.19.82.0/2510.19.82.1 – 10.19.82.12610.19.82.127
3810.19.82.128/2510.19.82.129 – 10.19.82.25410.19.82.255
3910.19.83.0/2510.19.83.1 – 10.19.83.12610.19.83.127
4010.19.83.128/2510.19.83.129 – 10.19.83.25410.19.83.255
4110.19.84.0/2510.19.84.1 – 10.19.84.12610.19.84.127
4210.19.84.128/2510.19.84.129 – 10.19.84.25410.19.84.255
4310.19.85.0/2510.19.85.1 – 10.19.85.12610.19.85.127
4410.19.85.128/2510.19.85.129 – 10.19.85.25410.19.85.255
4510.19.86.0/2510.19.86.1 – 10.19.86.12610.19.86.127
4610.19.86.128/2510.19.86.129 – 10.19.86.25410.19.86.255
4710.19.87.0/2510.19.87.1 – 10.19.87.12610.19.87.127
4810.19.87.128/2510.19.87.129 – 10.19.87.25410.19.87.255
4910.19.88.0/2510.19.88.1 – 10.19.88.12610.19.88.127
5010.19.88.128/2510.19.88.129 – 10.19.88.25410.19.88.255
5110.19.89.0/2510.19.89.1 – 10.19.89.12610.19.89.127
5210.19.89.128/2510.19.89.129 – 10.19.89.25410.19.89.255
5310.19.90.0/2510.19.90.1 – 10.19.90.12610.19.90.127
5410.19.90.128/2510.19.90.129 – 10.19.90.25410.19.90.255
5510.19.91.0/2510.19.91.1 – 10.19.91.12610.19.91.127
5610.19.91.128/2510.19.91.129 – 10.19.91.25410.19.91.255
5710.19.92.0/2510.19.92.1 – 10.19.92.12610.19.92.127
5810.19.92.128/2510.19.92.129 – 10.19.92.25410.19.92.255
5910.19.93.0/2510.19.93.1 – 10.19.93.12610.19.93.127
6010.19.93.128/2510.19.93.129 – 10.19.93.25410.19.93.255
6110.19.94.0/2510.19.94.1 – 10.19.94.12610.19.94.127
6210.19.94.128/2510.19.94.129 – 10.19.94.25410.19.94.255
6310.19.95.0/2510.19.95.1 – 10.19.95.12610.19.95.127
6410.19.95.128/2510.19.95.129 – 10.19.95.25410.19.95.255
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 →