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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)10.29.64.0/19
network10.29.64.0/19
broadcast10.29.95.255
first host10.29.64.1
last host10.29.95.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.29.64.0/19
address00001010.00011101.01000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00011101.01000000.00000000
broadcast00001010.00011101.01011111.11111111
green = network part, grey = host part
hex0x0a1d4000
decimal169689088
reverse dns0.64.29.10.in-addr.arpa
ipv4-mapped::ffff:a1d:4000

/19 split into /25 · 64 subnets

close ×
#networkhost rangebroadcast
110.29.64.0/2510.29.64.1 – 10.29.64.12610.29.64.127
210.29.64.128/2510.29.64.129 – 10.29.64.25410.29.64.255
310.29.65.0/2510.29.65.1 – 10.29.65.12610.29.65.127
410.29.65.128/2510.29.65.129 – 10.29.65.25410.29.65.255
510.29.66.0/2510.29.66.1 – 10.29.66.12610.29.66.127
610.29.66.128/2510.29.66.129 – 10.29.66.25410.29.66.255
710.29.67.0/2510.29.67.1 – 10.29.67.12610.29.67.127
810.29.67.128/2510.29.67.129 – 10.29.67.25410.29.67.255
910.29.68.0/2510.29.68.1 – 10.29.68.12610.29.68.127
1010.29.68.128/2510.29.68.129 – 10.29.68.25410.29.68.255
1110.29.69.0/2510.29.69.1 – 10.29.69.12610.29.69.127
1210.29.69.128/2510.29.69.129 – 10.29.69.25410.29.69.255
1310.29.70.0/2510.29.70.1 – 10.29.70.12610.29.70.127
1410.29.70.128/2510.29.70.129 – 10.29.70.25410.29.70.255
1510.29.71.0/2510.29.71.1 – 10.29.71.12610.29.71.127
1610.29.71.128/2510.29.71.129 – 10.29.71.25410.29.71.255
1710.29.72.0/2510.29.72.1 – 10.29.72.12610.29.72.127
1810.29.72.128/2510.29.72.129 – 10.29.72.25410.29.72.255
1910.29.73.0/2510.29.73.1 – 10.29.73.12610.29.73.127
2010.29.73.128/2510.29.73.129 – 10.29.73.25410.29.73.255
2110.29.74.0/2510.29.74.1 – 10.29.74.12610.29.74.127
2210.29.74.128/2510.29.74.129 – 10.29.74.25410.29.74.255
2310.29.75.0/2510.29.75.1 – 10.29.75.12610.29.75.127
2410.29.75.128/2510.29.75.129 – 10.29.75.25410.29.75.255
2510.29.76.0/2510.29.76.1 – 10.29.76.12610.29.76.127
2610.29.76.128/2510.29.76.129 – 10.29.76.25410.29.76.255
2710.29.77.0/2510.29.77.1 – 10.29.77.12610.29.77.127
2810.29.77.128/2510.29.77.129 – 10.29.77.25410.29.77.255
2910.29.78.0/2510.29.78.1 – 10.29.78.12610.29.78.127
3010.29.78.128/2510.29.78.129 – 10.29.78.25410.29.78.255
3110.29.79.0/2510.29.79.1 – 10.29.79.12610.29.79.127
3210.29.79.128/2510.29.79.129 – 10.29.79.25410.29.79.255
3310.29.80.0/2510.29.80.1 – 10.29.80.12610.29.80.127
3410.29.80.128/2510.29.80.129 – 10.29.80.25410.29.80.255
3510.29.81.0/2510.29.81.1 – 10.29.81.12610.29.81.127
3610.29.81.128/2510.29.81.129 – 10.29.81.25410.29.81.255
3710.29.82.0/2510.29.82.1 – 10.29.82.12610.29.82.127
3810.29.82.128/2510.29.82.129 – 10.29.82.25410.29.82.255
3910.29.83.0/2510.29.83.1 – 10.29.83.12610.29.83.127
4010.29.83.128/2510.29.83.129 – 10.29.83.25410.29.83.255
4110.29.84.0/2510.29.84.1 – 10.29.84.12610.29.84.127
4210.29.84.128/2510.29.84.129 – 10.29.84.25410.29.84.255
4310.29.85.0/2510.29.85.1 – 10.29.85.12610.29.85.127
4410.29.85.128/2510.29.85.129 – 10.29.85.25410.29.85.255
4510.29.86.0/2510.29.86.1 – 10.29.86.12610.29.86.127
4610.29.86.128/2510.29.86.129 – 10.29.86.25410.29.86.255
4710.29.87.0/2510.29.87.1 – 10.29.87.12610.29.87.127
4810.29.87.128/2510.29.87.129 – 10.29.87.25410.29.87.255
4910.29.88.0/2510.29.88.1 – 10.29.88.12610.29.88.127
5010.29.88.128/2510.29.88.129 – 10.29.88.25410.29.88.255
5110.29.89.0/2510.29.89.1 – 10.29.89.12610.29.89.127
5210.29.89.128/2510.29.89.129 – 10.29.89.25410.29.89.255
5310.29.90.0/2510.29.90.1 – 10.29.90.12610.29.90.127
5410.29.90.128/2510.29.90.129 – 10.29.90.25410.29.90.255
5510.29.91.0/2510.29.91.1 – 10.29.91.12610.29.91.127
5610.29.91.128/2510.29.91.129 – 10.29.91.25410.29.91.255
5710.29.92.0/2510.29.92.1 – 10.29.92.12610.29.92.127
5810.29.92.128/2510.29.92.129 – 10.29.92.25410.29.92.255
5910.29.93.0/2510.29.93.1 – 10.29.93.12610.29.93.127
6010.29.93.128/2510.29.93.129 – 10.29.93.25410.29.93.255
6110.29.94.0/2510.29.94.1 – 10.29.94.12610.29.94.127
6210.29.94.128/2510.29.94.129 – 10.29.94.25410.29.94.255
6310.29.95.0/2510.29.95.1 – 10.29.95.12610.29.95.127
6410.29.95.128/2510.29.95.129 – 10.29.95.25410.29.95.255
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 →