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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)10.232.0.0/20
network10.232.0.0/20
broadcast10.232.15.255
first host10.232.0.1
last host10.232.15.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.232.0.0/20
address00001010.11101000.00000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.11101000.00000000.00000000
broadcast00001010.11101000.00001111.11111111
green = network part, grey = host part
hex0x0ae80000
decimal182976512
reverse dns0.0.232.10.in-addr.arpa
ipv4-mapped::ffff:ae8:0

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.232.0.0/2610.232.0.1 – 10.232.0.6210.232.0.63
210.232.0.64/2610.232.0.65 – 10.232.0.12610.232.0.127
310.232.0.128/2610.232.0.129 – 10.232.0.19010.232.0.191
410.232.0.192/2610.232.0.193 – 10.232.0.25410.232.0.255
510.232.1.0/2610.232.1.1 – 10.232.1.6210.232.1.63
610.232.1.64/2610.232.1.65 – 10.232.1.12610.232.1.127
710.232.1.128/2610.232.1.129 – 10.232.1.19010.232.1.191
810.232.1.192/2610.232.1.193 – 10.232.1.25410.232.1.255
910.232.2.0/2610.232.2.1 – 10.232.2.6210.232.2.63
1010.232.2.64/2610.232.2.65 – 10.232.2.12610.232.2.127
1110.232.2.128/2610.232.2.129 – 10.232.2.19010.232.2.191
1210.232.2.192/2610.232.2.193 – 10.232.2.25410.232.2.255
1310.232.3.0/2610.232.3.1 – 10.232.3.6210.232.3.63
1410.232.3.64/2610.232.3.65 – 10.232.3.12610.232.3.127
1510.232.3.128/2610.232.3.129 – 10.232.3.19010.232.3.191
1610.232.3.192/2610.232.3.193 – 10.232.3.25410.232.3.255
1710.232.4.0/2610.232.4.1 – 10.232.4.6210.232.4.63
1810.232.4.64/2610.232.4.65 – 10.232.4.12610.232.4.127
1910.232.4.128/2610.232.4.129 – 10.232.4.19010.232.4.191
2010.232.4.192/2610.232.4.193 – 10.232.4.25410.232.4.255
2110.232.5.0/2610.232.5.1 – 10.232.5.6210.232.5.63
2210.232.5.64/2610.232.5.65 – 10.232.5.12610.232.5.127
2310.232.5.128/2610.232.5.129 – 10.232.5.19010.232.5.191
2410.232.5.192/2610.232.5.193 – 10.232.5.25410.232.5.255
2510.232.6.0/2610.232.6.1 – 10.232.6.6210.232.6.63
2610.232.6.64/2610.232.6.65 – 10.232.6.12610.232.6.127
2710.232.6.128/2610.232.6.129 – 10.232.6.19010.232.6.191
2810.232.6.192/2610.232.6.193 – 10.232.6.25410.232.6.255
2910.232.7.0/2610.232.7.1 – 10.232.7.6210.232.7.63
3010.232.7.64/2610.232.7.65 – 10.232.7.12610.232.7.127
3110.232.7.128/2610.232.7.129 – 10.232.7.19010.232.7.191
3210.232.7.192/2610.232.7.193 – 10.232.7.25410.232.7.255
3310.232.8.0/2610.232.8.1 – 10.232.8.6210.232.8.63
3410.232.8.64/2610.232.8.65 – 10.232.8.12610.232.8.127
3510.232.8.128/2610.232.8.129 – 10.232.8.19010.232.8.191
3610.232.8.192/2610.232.8.193 – 10.232.8.25410.232.8.255
3710.232.9.0/2610.232.9.1 – 10.232.9.6210.232.9.63
3810.232.9.64/2610.232.9.65 – 10.232.9.12610.232.9.127
3910.232.9.128/2610.232.9.129 – 10.232.9.19010.232.9.191
4010.232.9.192/2610.232.9.193 – 10.232.9.25410.232.9.255
4110.232.10.0/2610.232.10.1 – 10.232.10.6210.232.10.63
4210.232.10.64/2610.232.10.65 – 10.232.10.12610.232.10.127
4310.232.10.128/2610.232.10.129 – 10.232.10.19010.232.10.191
4410.232.10.192/2610.232.10.193 – 10.232.10.25410.232.10.255
4510.232.11.0/2610.232.11.1 – 10.232.11.6210.232.11.63
4610.232.11.64/2610.232.11.65 – 10.232.11.12610.232.11.127
4710.232.11.128/2610.232.11.129 – 10.232.11.19010.232.11.191
4810.232.11.192/2610.232.11.193 – 10.232.11.25410.232.11.255
4910.232.12.0/2610.232.12.1 – 10.232.12.6210.232.12.63
5010.232.12.64/2610.232.12.65 – 10.232.12.12610.232.12.127
5110.232.12.128/2610.232.12.129 – 10.232.12.19010.232.12.191
5210.232.12.192/2610.232.12.193 – 10.232.12.25410.232.12.255
5310.232.13.0/2610.232.13.1 – 10.232.13.6210.232.13.63
5410.232.13.64/2610.232.13.65 – 10.232.13.12610.232.13.127
5510.232.13.128/2610.232.13.129 – 10.232.13.19010.232.13.191
5610.232.13.192/2610.232.13.193 – 10.232.13.25410.232.13.255
5710.232.14.0/2610.232.14.1 – 10.232.14.6210.232.14.63
5810.232.14.64/2610.232.14.65 – 10.232.14.12610.232.14.127
5910.232.14.128/2610.232.14.129 – 10.232.14.19010.232.14.191
6010.232.14.192/2610.232.14.193 – 10.232.14.25410.232.14.255
6110.232.15.0/2610.232.15.1 – 10.232.15.6210.232.15.63
6210.232.15.64/2610.232.15.65 – 10.232.15.12610.232.15.127
6310.232.15.128/2610.232.15.129 – 10.232.15.19010.232.15.191
6410.232.15.192/2610.232.15.193 – 10.232.15.25410.232.15.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /20
/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-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,0941
/21255.255.248.02,0482,0462 split →
/22255.255.252.01,0241,0224 split →
/23255.255.254.05125108 split →
/24255.255.255.025625416 split →
/25255.255.255.12812812632 split →
/26255.255.255.192646264 split →
/27255.255.255.2243230128 split →
/28255.255.255.2401614256 split →
/29255.255.255.24886512 split →
/30255.255.255.252421,024 split →
/31255.255.255.254222,048 split →
/32255.255.255.255114,096 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 →