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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)10.1.204.0/22
network10.1.204.0/22
broadcast10.1.207.255
first host10.1.204.1
last host10.1.207.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.1.204.0/22
address00001010.00000001.11001100.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00000001.11001100.00000000
broadcast00001010.00000001.11001111.11111111
green = network part, grey = host part
hex0x0a01cc00
decimal167889920
reverse dns0.204.1.10.in-addr.arpa
ipv4-mapped::ffff:a01:cc00

/22 split into /26 · 16 subnets

close ×
#networkhost rangebroadcast
110.1.204.0/2610.1.204.1 – 10.1.204.6210.1.204.63
210.1.204.64/2610.1.204.65 – 10.1.204.12610.1.204.127
310.1.204.128/2610.1.204.129 – 10.1.204.19010.1.204.191
410.1.204.192/2610.1.204.193 – 10.1.204.25410.1.204.255
510.1.205.0/2610.1.205.1 – 10.1.205.6210.1.205.63
610.1.205.64/2610.1.205.65 – 10.1.205.12610.1.205.127
710.1.205.128/2610.1.205.129 – 10.1.205.19010.1.205.191
810.1.205.192/2610.1.205.193 – 10.1.205.25410.1.205.255
910.1.206.0/2610.1.206.1 – 10.1.206.6210.1.206.63
1010.1.206.64/2610.1.206.65 – 10.1.206.12610.1.206.127
1110.1.206.128/2610.1.206.129 – 10.1.206.19010.1.206.191
1210.1.206.192/2610.1.206.193 – 10.1.206.25410.1.206.255
1310.1.207.0/2610.1.207.1 – 10.1.207.6210.1.207.63
1410.1.207.64/2610.1.207.65 – 10.1.207.12610.1.207.127
1510.1.207.128/2610.1.207.129 – 10.1.207.19010.1.207.191
1610.1.207.192/2610.1.207.193 – 10.1.207.25410.1.207.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /22
/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-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,0221
/23255.255.254.05125102 split →
/24255.255.255.02562544 split →
/25255.255.255.1281281268 split →
/26255.255.255.192646216 split →
/27255.255.255.224323032 split →
/28255.255.255.240161464 split →
/29255.255.255.24886128 split →
/30255.255.255.25242256 split →
/31255.255.255.25422512 split →
/32255.255.255.255111,024 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 →