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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)10.131.22.0/23
network10.131.22.0/23
broadcast10.131.23.255
first host10.131.22.1
last host10.131.23.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.131.22.0/23
address00001010.10000011.00010110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.10000011.00010110.00000000
broadcast00001010.10000011.00010111.11111111
green = network part, grey = host part
hex0x0a831600
decimal176363008
reverse dns0.22.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:1600

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.131.22.0/2810.131.22.1 – 10.131.22.1410.131.22.15
210.131.22.16/2810.131.22.17 – 10.131.22.3010.131.22.31
310.131.22.32/2810.131.22.33 – 10.131.22.4610.131.22.47
410.131.22.48/2810.131.22.49 – 10.131.22.6210.131.22.63
510.131.22.64/2810.131.22.65 – 10.131.22.7810.131.22.79
610.131.22.80/2810.131.22.81 – 10.131.22.9410.131.22.95
710.131.22.96/2810.131.22.97 – 10.131.22.11010.131.22.111
810.131.22.112/2810.131.22.113 – 10.131.22.12610.131.22.127
910.131.22.128/2810.131.22.129 – 10.131.22.14210.131.22.143
1010.131.22.144/2810.131.22.145 – 10.131.22.15810.131.22.159
1110.131.22.160/2810.131.22.161 – 10.131.22.17410.131.22.175
1210.131.22.176/2810.131.22.177 – 10.131.22.19010.131.22.191
1310.131.22.192/2810.131.22.193 – 10.131.22.20610.131.22.207
1410.131.22.208/2810.131.22.209 – 10.131.22.22210.131.22.223
1510.131.22.224/2810.131.22.225 – 10.131.22.23810.131.22.239
1610.131.22.240/2810.131.22.241 – 10.131.22.25410.131.22.255
1710.131.23.0/2810.131.23.1 – 10.131.23.1410.131.23.15
1810.131.23.16/2810.131.23.17 – 10.131.23.3010.131.23.31
1910.131.23.32/2810.131.23.33 – 10.131.23.4610.131.23.47
2010.131.23.48/2810.131.23.49 – 10.131.23.6210.131.23.63
2110.131.23.64/2810.131.23.65 – 10.131.23.7810.131.23.79
2210.131.23.80/2810.131.23.81 – 10.131.23.9410.131.23.95
2310.131.23.96/2810.131.23.97 – 10.131.23.11010.131.23.111
2410.131.23.112/2810.131.23.113 – 10.131.23.12610.131.23.127
2510.131.23.128/2810.131.23.129 – 10.131.23.14210.131.23.143
2610.131.23.144/2810.131.23.145 – 10.131.23.15810.131.23.159
2710.131.23.160/2810.131.23.161 – 10.131.23.17410.131.23.175
2810.131.23.176/2810.131.23.177 – 10.131.23.19010.131.23.191
2910.131.23.192/2810.131.23.193 – 10.131.23.20610.131.23.207
3010.131.23.208/2810.131.23.209 – 10.131.23.22210.131.23.223
3110.131.23.224/2810.131.23.225 – 10.131.23.23810.131.23.239
3210.131.23.240/2810.131.23.241 – 10.131.23.25410.131.23.255
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /23
/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-
/23255.255.254.05125101
/24255.255.255.02562542 split →
/25255.255.255.1281281264 split →
/26255.255.255.19264628 split →
/27255.255.255.224323016 split →
/28255.255.255.240161432 split →
/29255.255.255.2488664 split →
/30255.255.255.25242128 split →
/31255.255.255.25422256 split →
/32255.255.255.25511512 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 →