ip
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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)10.231.86.0/23
network10.231.86.0/23
broadcast10.231.87.255
first host10.231.86.1
last host10.231.87.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.231.86.0/23
address00001010.11100111.01010110.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.11100111.01010110.00000000
broadcast00001010.11100111.01010111.11111111
green = network part, grey = host part
hex0x0ae75600
decimal182932992
reverse dns0.86.231.10.in-addr.arpa
ipv4-mapped::ffff:ae7:5600

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.231.86.0/2810.231.86.1 – 10.231.86.1410.231.86.15
210.231.86.16/2810.231.86.17 – 10.231.86.3010.231.86.31
310.231.86.32/2810.231.86.33 – 10.231.86.4610.231.86.47
410.231.86.48/2810.231.86.49 – 10.231.86.6210.231.86.63
510.231.86.64/2810.231.86.65 – 10.231.86.7810.231.86.79
610.231.86.80/2810.231.86.81 – 10.231.86.9410.231.86.95
710.231.86.96/2810.231.86.97 – 10.231.86.11010.231.86.111
810.231.86.112/2810.231.86.113 – 10.231.86.12610.231.86.127
910.231.86.128/2810.231.86.129 – 10.231.86.14210.231.86.143
1010.231.86.144/2810.231.86.145 – 10.231.86.15810.231.86.159
1110.231.86.160/2810.231.86.161 – 10.231.86.17410.231.86.175
1210.231.86.176/2810.231.86.177 – 10.231.86.19010.231.86.191
1310.231.86.192/2810.231.86.193 – 10.231.86.20610.231.86.207
1410.231.86.208/2810.231.86.209 – 10.231.86.22210.231.86.223
1510.231.86.224/2810.231.86.225 – 10.231.86.23810.231.86.239
1610.231.86.240/2810.231.86.241 – 10.231.86.25410.231.86.255
1710.231.87.0/2810.231.87.1 – 10.231.87.1410.231.87.15
1810.231.87.16/2810.231.87.17 – 10.231.87.3010.231.87.31
1910.231.87.32/2810.231.87.33 – 10.231.87.4610.231.87.47
2010.231.87.48/2810.231.87.49 – 10.231.87.6210.231.87.63
2110.231.87.64/2810.231.87.65 – 10.231.87.7810.231.87.79
2210.231.87.80/2810.231.87.81 – 10.231.87.9410.231.87.95
2310.231.87.96/2810.231.87.97 – 10.231.87.11010.231.87.111
2410.231.87.112/2810.231.87.113 – 10.231.87.12610.231.87.127
2510.231.87.128/2810.231.87.129 – 10.231.87.14210.231.87.143
2610.231.87.144/2810.231.87.145 – 10.231.87.15810.231.87.159
2710.231.87.160/2810.231.87.161 – 10.231.87.17410.231.87.175
2810.231.87.176/2810.231.87.177 – 10.231.87.19010.231.87.191
2910.231.87.192/2810.231.87.193 – 10.231.87.20610.231.87.207
3010.231.87.208/2810.231.87.209 – 10.231.87.22210.231.87.223
3110.231.87.224/2810.231.87.225 – 10.231.87.23810.231.87.239
3210.231.87.240/2810.231.87.241 – 10.231.87.25410.231.87.255
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 →