ip
ipku.in

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)10.2.100.0/23
network10.2.100.0/23
broadcast10.2.101.255
first host10.2.100.1
last host10.2.101.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.2.100.0/23
address00001010.00000010.01100100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.00000010.01100100.00000000
broadcast00001010.00000010.01100101.11111111
green = network part, grey = host part
hex0x0a026400
decimal167928832
reverse dns0.100.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:6400

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.100.0/2810.2.100.1 – 10.2.100.1410.2.100.15
210.2.100.16/2810.2.100.17 – 10.2.100.3010.2.100.31
310.2.100.32/2810.2.100.33 – 10.2.100.4610.2.100.47
410.2.100.48/2810.2.100.49 – 10.2.100.6210.2.100.63
510.2.100.64/2810.2.100.65 – 10.2.100.7810.2.100.79
610.2.100.80/2810.2.100.81 – 10.2.100.9410.2.100.95
710.2.100.96/2810.2.100.97 – 10.2.100.11010.2.100.111
810.2.100.112/2810.2.100.113 – 10.2.100.12610.2.100.127
910.2.100.128/2810.2.100.129 – 10.2.100.14210.2.100.143
1010.2.100.144/2810.2.100.145 – 10.2.100.15810.2.100.159
1110.2.100.160/2810.2.100.161 – 10.2.100.17410.2.100.175
1210.2.100.176/2810.2.100.177 – 10.2.100.19010.2.100.191
1310.2.100.192/2810.2.100.193 – 10.2.100.20610.2.100.207
1410.2.100.208/2810.2.100.209 – 10.2.100.22210.2.100.223
1510.2.100.224/2810.2.100.225 – 10.2.100.23810.2.100.239
1610.2.100.240/2810.2.100.241 – 10.2.100.25410.2.100.255
1710.2.101.0/2810.2.101.1 – 10.2.101.1410.2.101.15
1810.2.101.16/2810.2.101.17 – 10.2.101.3010.2.101.31
1910.2.101.32/2810.2.101.33 – 10.2.101.4610.2.101.47
2010.2.101.48/2810.2.101.49 – 10.2.101.6210.2.101.63
2110.2.101.64/2810.2.101.65 – 10.2.101.7810.2.101.79
2210.2.101.80/2810.2.101.81 – 10.2.101.9410.2.101.95
2310.2.101.96/2810.2.101.97 – 10.2.101.11010.2.101.111
2410.2.101.112/2810.2.101.113 – 10.2.101.12610.2.101.127
2510.2.101.128/2810.2.101.129 – 10.2.101.14210.2.101.143
2610.2.101.144/2810.2.101.145 – 10.2.101.15810.2.101.159
2710.2.101.160/2810.2.101.161 – 10.2.101.17410.2.101.175
2810.2.101.176/2810.2.101.177 – 10.2.101.19010.2.101.191
2910.2.101.192/2810.2.101.193 – 10.2.101.20610.2.101.207
3010.2.101.208/2810.2.101.209 – 10.2.101.22210.2.101.223
3110.2.101.224/2810.2.101.225 – 10.2.101.23810.2.101.239
3210.2.101.240/2810.2.101.241 – 10.2.101.25410.2.101.255
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 →