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)10.71.44.0/23
network10.71.44.0/23
broadcast10.71.45.255
first host10.71.44.1
last host10.71.45.254
subnet mask255.255.254.0
wildcard0.0.1.255
addresses512
usable hosts510
classA
ipcalc 10.71.44.0/23
address00001010.01000111.00101100.00000000
subnet mask11111111.11111111.11111110.00000000
network00001010.01000111.00101100.00000000
broadcast00001010.01000111.00101101.11111111
green = network part, grey = host part
hex0x0a472c00
decimal172436480
reverse dns0.44.71.10.in-addr.arpa
ipv4-mapped::ffff:a47:2c00

/23 split into /28 · 32 subnets

close ×
#networkhost rangebroadcast
110.71.44.0/2810.71.44.1 – 10.71.44.1410.71.44.15
210.71.44.16/2810.71.44.17 – 10.71.44.3010.71.44.31
310.71.44.32/2810.71.44.33 – 10.71.44.4610.71.44.47
410.71.44.48/2810.71.44.49 – 10.71.44.6210.71.44.63
510.71.44.64/2810.71.44.65 – 10.71.44.7810.71.44.79
610.71.44.80/2810.71.44.81 – 10.71.44.9410.71.44.95
710.71.44.96/2810.71.44.97 – 10.71.44.11010.71.44.111
810.71.44.112/2810.71.44.113 – 10.71.44.12610.71.44.127
910.71.44.128/2810.71.44.129 – 10.71.44.14210.71.44.143
1010.71.44.144/2810.71.44.145 – 10.71.44.15810.71.44.159
1110.71.44.160/2810.71.44.161 – 10.71.44.17410.71.44.175
1210.71.44.176/2810.71.44.177 – 10.71.44.19010.71.44.191
1310.71.44.192/2810.71.44.193 – 10.71.44.20610.71.44.207
1410.71.44.208/2810.71.44.209 – 10.71.44.22210.71.44.223
1510.71.44.224/2810.71.44.225 – 10.71.44.23810.71.44.239
1610.71.44.240/2810.71.44.241 – 10.71.44.25410.71.44.255
1710.71.45.0/2810.71.45.1 – 10.71.45.1410.71.45.15
1810.71.45.16/2810.71.45.17 – 10.71.45.3010.71.45.31
1910.71.45.32/2810.71.45.33 – 10.71.45.4610.71.45.47
2010.71.45.48/2810.71.45.49 – 10.71.45.6210.71.45.63
2110.71.45.64/2810.71.45.65 – 10.71.45.7810.71.45.79
2210.71.45.80/2810.71.45.81 – 10.71.45.9410.71.45.95
2310.71.45.96/2810.71.45.97 – 10.71.45.11010.71.45.111
2410.71.45.112/2810.71.45.113 – 10.71.45.12610.71.45.127
2510.71.45.128/2810.71.45.129 – 10.71.45.14210.71.45.143
2610.71.45.144/2810.71.45.145 – 10.71.45.15810.71.45.159
2710.71.45.160/2810.71.45.161 – 10.71.45.17410.71.45.175
2810.71.45.176/2810.71.45.177 – 10.71.45.19010.71.45.191
2910.71.45.192/2810.71.45.193 – 10.71.45.20610.71.45.207
3010.71.45.208/2810.71.45.209 – 10.71.45.22210.71.45.223
3110.71.45.224/2810.71.45.225 – 10.71.45.23810.71.45.239
3210.71.45.240/2810.71.45.241 – 10.71.45.25410.71.45.255
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 →