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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)10.3.248.0/22
network10.3.248.0/22
broadcast10.3.251.255
first host10.3.248.1
last host10.3.251.254
subnet mask255.255.252.0
wildcard0.0.3.255
addresses1,024
usable hosts1,022
classA
ipcalc 10.3.248.0/22
address00001010.00000011.11111000.00000000
subnet mask11111111.11111111.11111100.00000000
network00001010.00000011.11111000.00000000
broadcast00001010.00000011.11111011.11111111
green = network part, grey = host part
hex0x0a03f800
decimal168032256
reverse dns0.248.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:f800

/22 split into /26 · 16 subnets

close ×
#networkhost rangebroadcast
110.3.248.0/2610.3.248.1 – 10.3.248.6210.3.248.63
210.3.248.64/2610.3.248.65 – 10.3.248.12610.3.248.127
310.3.248.128/2610.3.248.129 – 10.3.248.19010.3.248.191
410.3.248.192/2610.3.248.193 – 10.3.248.25410.3.248.255
510.3.249.0/2610.3.249.1 – 10.3.249.6210.3.249.63
610.3.249.64/2610.3.249.65 – 10.3.249.12610.3.249.127
710.3.249.128/2610.3.249.129 – 10.3.249.19010.3.249.191
810.3.249.192/2610.3.249.193 – 10.3.249.25410.3.249.255
910.3.250.0/2610.3.250.1 – 10.3.250.6210.3.250.63
1010.3.250.64/2610.3.250.65 – 10.3.250.12610.3.250.127
1110.3.250.128/2610.3.250.129 – 10.3.250.19010.3.250.191
1210.3.250.192/2610.3.250.193 – 10.3.250.25410.3.250.255
1310.3.251.0/2610.3.251.1 – 10.3.251.6210.3.251.63
1410.3.251.64/2610.3.251.65 – 10.3.251.12610.3.251.127
1510.3.251.128/2610.3.251.129 – 10.3.251.19010.3.251.191
1610.3.251.192/2610.3.251.193 – 10.3.251.25410.3.251.255
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 →