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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)10.1.0.0/20
network10.1.0.0/20
broadcast10.1.15.255
first host10.1.0.1
last host10.1.15.254
subnet mask255.255.240.0
wildcard0.0.15.255
addresses4,096
usable hosts4,094
classA
ipcalc 10.1.0.0/20
address00001010.00000001.00000000.00000000
subnet mask11111111.11111111.11110000.00000000
network00001010.00000001.00000000.00000000
broadcast00001010.00000001.00001111.11111111
green = network part, grey = host part
hex0x0a010000
decimal167837696
reverse dns0.0.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:0

/20 split into /26 · 64 subnets

close ×
#networkhost rangebroadcast
110.1.0.0/2610.1.0.1 – 10.1.0.6210.1.0.63
210.1.0.64/2610.1.0.65 – 10.1.0.12610.1.0.127
310.1.0.128/2610.1.0.129 – 10.1.0.19010.1.0.191
410.1.0.192/2610.1.0.193 – 10.1.0.25410.1.0.255
510.1.1.0/2610.1.1.1 – 10.1.1.6210.1.1.63
610.1.1.64/2610.1.1.65 – 10.1.1.12610.1.1.127
710.1.1.128/2610.1.1.129 – 10.1.1.19010.1.1.191
810.1.1.192/2610.1.1.193 – 10.1.1.25410.1.1.255
910.1.2.0/2610.1.2.1 – 10.1.2.6210.1.2.63
1010.1.2.64/2610.1.2.65 – 10.1.2.12610.1.2.127
1110.1.2.128/2610.1.2.129 – 10.1.2.19010.1.2.191
1210.1.2.192/2610.1.2.193 – 10.1.2.25410.1.2.255
1310.1.3.0/2610.1.3.1 – 10.1.3.6210.1.3.63
1410.1.3.64/2610.1.3.65 – 10.1.3.12610.1.3.127
1510.1.3.128/2610.1.3.129 – 10.1.3.19010.1.3.191
1610.1.3.192/2610.1.3.193 – 10.1.3.25410.1.3.255
1710.1.4.0/2610.1.4.1 – 10.1.4.6210.1.4.63
1810.1.4.64/2610.1.4.65 – 10.1.4.12610.1.4.127
1910.1.4.128/2610.1.4.129 – 10.1.4.19010.1.4.191
2010.1.4.192/2610.1.4.193 – 10.1.4.25410.1.4.255
2110.1.5.0/2610.1.5.1 – 10.1.5.6210.1.5.63
2210.1.5.64/2610.1.5.65 – 10.1.5.12610.1.5.127
2310.1.5.128/2610.1.5.129 – 10.1.5.19010.1.5.191
2410.1.5.192/2610.1.5.193 – 10.1.5.25410.1.5.255
2510.1.6.0/2610.1.6.1 – 10.1.6.6210.1.6.63
2610.1.6.64/2610.1.6.65 – 10.1.6.12610.1.6.127
2710.1.6.128/2610.1.6.129 – 10.1.6.19010.1.6.191
2810.1.6.192/2610.1.6.193 – 10.1.6.25410.1.6.255
2910.1.7.0/2610.1.7.1 – 10.1.7.6210.1.7.63
3010.1.7.64/2610.1.7.65 – 10.1.7.12610.1.7.127
3110.1.7.128/2610.1.7.129 – 10.1.7.19010.1.7.191
3210.1.7.192/2610.1.7.193 – 10.1.7.25410.1.7.255
3310.1.8.0/2610.1.8.1 – 10.1.8.6210.1.8.63
3410.1.8.64/2610.1.8.65 – 10.1.8.12610.1.8.127
3510.1.8.128/2610.1.8.129 – 10.1.8.19010.1.8.191
3610.1.8.192/2610.1.8.193 – 10.1.8.25410.1.8.255
3710.1.9.0/2610.1.9.1 – 10.1.9.6210.1.9.63
3810.1.9.64/2610.1.9.65 – 10.1.9.12610.1.9.127
3910.1.9.128/2610.1.9.129 – 10.1.9.19010.1.9.191
4010.1.9.192/2610.1.9.193 – 10.1.9.25410.1.9.255
4110.1.10.0/2610.1.10.1 – 10.1.10.6210.1.10.63
4210.1.10.64/2610.1.10.65 – 10.1.10.12610.1.10.127
4310.1.10.128/2610.1.10.129 – 10.1.10.19010.1.10.191
4410.1.10.192/2610.1.10.193 – 10.1.10.25410.1.10.255
4510.1.11.0/2610.1.11.1 – 10.1.11.6210.1.11.63
4610.1.11.64/2610.1.11.65 – 10.1.11.12610.1.11.127
4710.1.11.128/2610.1.11.129 – 10.1.11.19010.1.11.191
4810.1.11.192/2610.1.11.193 – 10.1.11.25410.1.11.255
4910.1.12.0/2610.1.12.1 – 10.1.12.6210.1.12.63
5010.1.12.64/2610.1.12.65 – 10.1.12.12610.1.12.127
5110.1.12.128/2610.1.12.129 – 10.1.12.19010.1.12.191
5210.1.12.192/2610.1.12.193 – 10.1.12.25410.1.12.255
5310.1.13.0/2610.1.13.1 – 10.1.13.6210.1.13.63
5410.1.13.64/2610.1.13.65 – 10.1.13.12610.1.13.127
5510.1.13.128/2610.1.13.129 – 10.1.13.19010.1.13.191
5610.1.13.192/2610.1.13.193 – 10.1.13.25410.1.13.255
5710.1.14.0/2610.1.14.1 – 10.1.14.6210.1.14.63
5810.1.14.64/2610.1.14.65 – 10.1.14.12610.1.14.127
5910.1.14.128/2610.1.14.129 – 10.1.14.19010.1.14.191
6010.1.14.192/2610.1.14.193 – 10.1.14.25410.1.14.255
6110.1.15.0/2610.1.15.1 – 10.1.15.6210.1.15.63
6210.1.15.64/2610.1.15.65 – 10.1.15.12610.1.15.127
6310.1.15.128/2610.1.15.129 – 10.1.15.19010.1.15.191
6410.1.15.192/2610.1.15.193 – 10.1.15.25410.1.15.255
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 →