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)10.78.180.0/23
network10.78.180.0/23
broadcast10.78.181.255
first host10.78.180.1
last host10.78.181.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.78.180.0/23
address00001010.01001110.10110100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01001110.10110100.00000000
broadcast00001010.01001110.10110101.11111111
green = network part, grey = host part
hex0x0a4eb400
decimal172930048
reverse dns0.180.78.10.in-addr.arpa
ipv4-mapped::ffff:a4e:b400

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.78.180.0/2810.78.180.1 – 10.78.180.1410.78.180.15
210.78.180.16/2810.78.180.17 – 10.78.180.3010.78.180.31
310.78.180.32/2810.78.180.33 – 10.78.180.4610.78.180.47
410.78.180.48/2810.78.180.49 – 10.78.180.6210.78.180.63
510.78.180.64/2810.78.180.65 – 10.78.180.7810.78.180.79
610.78.180.80/2810.78.180.81 – 10.78.180.9410.78.180.95
710.78.180.96/2810.78.180.97 – 10.78.180.11010.78.180.111
810.78.180.112/2810.78.180.113 – 10.78.180.12610.78.180.127
910.78.180.128/2810.78.180.129 – 10.78.180.14210.78.180.143
1010.78.180.144/2810.78.180.145 – 10.78.180.15810.78.180.159
1110.78.180.160/2810.78.180.161 – 10.78.180.17410.78.180.175
1210.78.180.176/2810.78.180.177 – 10.78.180.19010.78.180.191
1310.78.180.192/2810.78.180.193 – 10.78.180.20610.78.180.207
1410.78.180.208/2810.78.180.209 – 10.78.180.22210.78.180.223
1510.78.180.224/2810.78.180.225 – 10.78.180.23810.78.180.239
1610.78.180.240/2810.78.180.241 – 10.78.180.25410.78.180.255
1710.78.181.0/2810.78.181.1 – 10.78.181.1410.78.181.15
1810.78.181.16/2810.78.181.17 – 10.78.181.3010.78.181.31
1910.78.181.32/2810.78.181.33 – 10.78.181.4610.78.181.47
2010.78.181.48/2810.78.181.49 – 10.78.181.6210.78.181.63
2110.78.181.64/2810.78.181.65 – 10.78.181.7810.78.181.79
2210.78.181.80/2810.78.181.81 – 10.78.181.9410.78.181.95
2310.78.181.96/2810.78.181.97 – 10.78.181.11010.78.181.111
2410.78.181.112/2810.78.181.113 – 10.78.181.12610.78.181.127
2510.78.181.128/2810.78.181.129 – 10.78.181.14210.78.181.143
2610.78.181.144/2810.78.181.145 – 10.78.181.15810.78.181.159
2710.78.181.160/2810.78.181.161 – 10.78.181.17410.78.181.175
2810.78.181.176/2810.78.181.177 – 10.78.181.19010.78.181.191
2910.78.181.192/2810.78.181.193 – 10.78.181.20610.78.181.207
3010.78.181.208/2810.78.181.209 – 10.78.181.22210.78.181.223
3110.78.181.224/2810.78.181.225 – 10.78.181.23810.78.181.239
3210.78.181.240/2810.78.181.241 – 10.78.181.25410.78.181.255
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 →