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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)10.0.20.0/24
network10.0.20.0/24
broadcast10.0.20.255
first host10.0.20.1
last host10.0.20.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.0.20.0/24
address00001010.00000000.00010100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000000.00010100.00000000
broadcast00001010.00000000.00010100.11111111
green = network part, grey = host part
hex0x0a001400
decimal167777280
reverse dns0.20.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:1400

/24 split into /28 · 16 subnets

close ×
#networkhost rangebroadcast
110.0.20.0/2810.0.20.1 – 10.0.20.1410.0.20.15
210.0.20.16/2810.0.20.17 – 10.0.20.3010.0.20.31
310.0.20.32/2810.0.20.33 – 10.0.20.4610.0.20.47
410.0.20.48/2810.0.20.49 – 10.0.20.6210.0.20.63
510.0.20.64/2810.0.20.65 – 10.0.20.7810.0.20.79
610.0.20.80/2810.0.20.81 – 10.0.20.9410.0.20.95
710.0.20.96/2810.0.20.97 – 10.0.20.11010.0.20.111
810.0.20.112/2810.0.20.113 – 10.0.20.12610.0.20.127
910.0.20.128/2810.0.20.129 – 10.0.20.14210.0.20.143
1010.0.20.144/2810.0.20.145 – 10.0.20.15810.0.20.159
1110.0.20.160/2810.0.20.161 – 10.0.20.17410.0.20.175
1210.0.20.176/2810.0.20.177 – 10.0.20.19010.0.20.191
1310.0.20.192/2810.0.20.193 – 10.0.20.20610.0.20.207
1410.0.20.208/2810.0.20.209 – 10.0.20.22210.0.20.223
1510.0.20.224/2810.0.20.225 – 10.0.20.23810.0.20.239
1610.0.20.240/2810.0.20.241 – 10.0.20.25410.0.20.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /24
/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-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 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 →