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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)10.20.64.0/19
network10.20.64.0/19
broadcast10.20.95.255
first host10.20.64.1
last host10.20.95.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.20.64.0/19
address00001010.00010100.01000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00010100.01000000.00000000
broadcast00001010.00010100.01011111.11111111
green = network part, grey = host part
hex0x0a144000
decimal169099264
reverse dns0.64.20.10.in-addr.arpa
ipv4-mapped::ffff:a14:4000

/19 split into /24 · 32 subnets

close ×
#networkhost rangebroadcast
110.20.64.0/2410.20.64.1 – 10.20.64.25410.20.64.255
210.20.65.0/2410.20.65.1 – 10.20.65.25410.20.65.255
310.20.66.0/2410.20.66.1 – 10.20.66.25410.20.66.255
410.20.67.0/2410.20.67.1 – 10.20.67.25410.20.67.255
510.20.68.0/2410.20.68.1 – 10.20.68.25410.20.68.255
610.20.69.0/2410.20.69.1 – 10.20.69.25410.20.69.255
710.20.70.0/2410.20.70.1 – 10.20.70.25410.20.70.255
810.20.71.0/2410.20.71.1 – 10.20.71.25410.20.71.255
910.20.72.0/2410.20.72.1 – 10.20.72.25410.20.72.255
1010.20.73.0/2410.20.73.1 – 10.20.73.25410.20.73.255
1110.20.74.0/2410.20.74.1 – 10.20.74.25410.20.74.255
1210.20.75.0/2410.20.75.1 – 10.20.75.25410.20.75.255
1310.20.76.0/2410.20.76.1 – 10.20.76.25410.20.76.255
1410.20.77.0/2410.20.77.1 – 10.20.77.25410.20.77.255
1510.20.78.0/2410.20.78.1 – 10.20.78.25410.20.78.255
1610.20.79.0/2410.20.79.1 – 10.20.79.25410.20.79.255
1710.20.80.0/2410.20.80.1 – 10.20.80.25410.20.80.255
1810.20.81.0/2410.20.81.1 – 10.20.81.25410.20.81.255
1910.20.82.0/2410.20.82.1 – 10.20.82.25410.20.82.255
2010.20.83.0/2410.20.83.1 – 10.20.83.25410.20.83.255
2110.20.84.0/2410.20.84.1 – 10.20.84.25410.20.84.255
2210.20.85.0/2410.20.85.1 – 10.20.85.25410.20.85.255
2310.20.86.0/2410.20.86.1 – 10.20.86.25410.20.86.255
2410.20.87.0/2410.20.87.1 – 10.20.87.25410.20.87.255
2510.20.88.0/2410.20.88.1 – 10.20.88.25410.20.88.255
2610.20.89.0/2410.20.89.1 – 10.20.89.25410.20.89.255
2710.20.90.0/2410.20.90.1 – 10.20.90.25410.20.90.255
2810.20.91.0/2410.20.91.1 – 10.20.91.25410.20.91.255
2910.20.92.0/2410.20.92.1 – 10.20.92.25410.20.92.255
3010.20.93.0/2410.20.93.1 – 10.20.93.25410.20.93.255
3110.20.94.0/2410.20.94.1 – 10.20.94.25410.20.94.255
3210.20.95.0/2410.20.95.1 – 10.20.95.25410.20.95.255
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 →