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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)10.0.186.0/23
network10.0.186.0/23
broadcast10.0.187.255
first host10.0.186.1
last host10.0.187.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.0.186.0/23
address00001010.00000000.10111010.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000000.10111010.00000000
broadcast00001010.00000000.10111011.11111111
green = network part, grey = host part
hex0x0a00ba00
decimal167819776
reverse dns0.186.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:ba00

/23 split into /27 · 16 subnets

close ×
#networkhost rangebroadcast
110.0.186.0/2710.0.186.1 – 10.0.186.3010.0.186.31
210.0.186.32/2710.0.186.33 – 10.0.186.6210.0.186.63
310.0.186.64/2710.0.186.65 – 10.0.186.9410.0.186.95
410.0.186.96/2710.0.186.97 – 10.0.186.12610.0.186.127
510.0.186.128/2710.0.186.129 – 10.0.186.15810.0.186.159
610.0.186.160/2710.0.186.161 – 10.0.186.19010.0.186.191
710.0.186.192/2710.0.186.193 – 10.0.186.22210.0.186.223
810.0.186.224/2710.0.186.225 – 10.0.186.25410.0.186.255
910.0.187.0/2710.0.187.1 – 10.0.187.3010.0.187.31
1010.0.187.32/2710.0.187.33 – 10.0.187.6210.0.187.63
1110.0.187.64/2710.0.187.65 – 10.0.187.9410.0.187.95
1210.0.187.96/2710.0.187.97 – 10.0.187.12610.0.187.127
1310.0.187.128/2710.0.187.129 – 10.0.187.15810.0.187.159
1410.0.187.160/2710.0.187.161 – 10.0.187.19010.0.187.191
1510.0.187.192/2710.0.187.193 – 10.0.187.22210.0.187.223
1610.0.187.224/2710.0.187.225 – 10.0.187.25410.0.187.255
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 →