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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)10.4.0.0/19
network10.4.0.0/19
broadcast10.4.31.255
first host10.4.0.1
last host10.4.31.254
subnet mask255.255.224.0
wildcard0.0.31.255
addresses8,192
usable hosts8,190
classA
ipcalc 10.4.0.0/19
address00001010.00000100.00000000.00000000
subnet mask11111111.11111111.11100000.00000000
network00001010.00000100.00000000.00000000
broadcast00001010.00000100.00011111.11111111
green = network part, grey = host part
hex0x0a040000
decimal168034304
reverse dns0.0.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:0

/19 split into /24 · 32 subnets

close ×
#networkhost rangebroadcast
110.4.0.0/2410.4.0.1 – 10.4.0.25410.4.0.255
210.4.1.0/2410.4.1.1 – 10.4.1.25410.4.1.255
310.4.2.0/2410.4.2.1 – 10.4.2.25410.4.2.255
410.4.3.0/2410.4.3.1 – 10.4.3.25410.4.3.255
510.4.4.0/2410.4.4.1 – 10.4.4.25410.4.4.255
610.4.5.0/2410.4.5.1 – 10.4.5.25410.4.5.255
710.4.6.0/2410.4.6.1 – 10.4.6.25410.4.6.255
810.4.7.0/2410.4.7.1 – 10.4.7.25410.4.7.255
910.4.8.0/2410.4.8.1 – 10.4.8.25410.4.8.255
1010.4.9.0/2410.4.9.1 – 10.4.9.25410.4.9.255
1110.4.10.0/2410.4.10.1 – 10.4.10.25410.4.10.255
1210.4.11.0/2410.4.11.1 – 10.4.11.25410.4.11.255
1310.4.12.0/2410.4.12.1 – 10.4.12.25410.4.12.255
1410.4.13.0/2410.4.13.1 – 10.4.13.25410.4.13.255
1510.4.14.0/2410.4.14.1 – 10.4.14.25410.4.14.255
1610.4.15.0/2410.4.15.1 – 10.4.15.25410.4.15.255
1710.4.16.0/2410.4.16.1 – 10.4.16.25410.4.16.255
1810.4.17.0/2410.4.17.1 – 10.4.17.25410.4.17.255
1910.4.18.0/2410.4.18.1 – 10.4.18.25410.4.18.255
2010.4.19.0/2410.4.19.1 – 10.4.19.25410.4.19.255
2110.4.20.0/2410.4.20.1 – 10.4.20.25410.4.20.255
2210.4.21.0/2410.4.21.1 – 10.4.21.25410.4.21.255
2310.4.22.0/2410.4.22.1 – 10.4.22.25410.4.22.255
2410.4.23.0/2410.4.23.1 – 10.4.23.25410.4.23.255
2510.4.24.0/2410.4.24.1 – 10.4.24.25410.4.24.255
2610.4.25.0/2410.4.25.1 – 10.4.25.25410.4.25.255
2710.4.26.0/2410.4.26.1 – 10.4.26.25410.4.26.255
2810.4.27.0/2410.4.27.1 – 10.4.27.25410.4.27.255
2910.4.28.0/2410.4.28.1 – 10.4.28.25410.4.28.255
3010.4.29.0/2410.4.29.1 – 10.4.29.25410.4.29.255
3110.4.30.0/2410.4.30.1 – 10.4.30.25410.4.30.255
3210.4.31.0/2410.4.31.1 – 10.4.31.25410.4.31.255
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 →