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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)10.167.45.128/26
network10.167.45.128/26
broadcast10.167.45.191
first host10.167.45.129
last host10.167.45.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.167.45.128/26
address00001010.10100111.00101101.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.10100111.00101101.10000000
broadcast00001010.10100111.00101101.10111111
green = network part, grey = host part
hex0x0aa72d80
decimal178728320
reverse dns128.45.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:2d80

/26 split into /30 · 16 subnets

close ×
#networkhost rangebroadcast
110.167.45.128/3010.167.45.129 – 10.167.45.13010.167.45.131
210.167.45.132/3010.167.45.133 – 10.167.45.13410.167.45.135
310.167.45.136/3010.167.45.137 – 10.167.45.13810.167.45.139
410.167.45.140/3010.167.45.141 – 10.167.45.14210.167.45.143
510.167.45.144/3010.167.45.145 – 10.167.45.14610.167.45.147
610.167.45.148/3010.167.45.149 – 10.167.45.15010.167.45.151
710.167.45.152/3010.167.45.153 – 10.167.45.15410.167.45.155
810.167.45.156/3010.167.45.157 – 10.167.45.15810.167.45.159
910.167.45.160/3010.167.45.161 – 10.167.45.16210.167.45.163
1010.167.45.164/3010.167.45.165 – 10.167.45.16610.167.45.167
1110.167.45.168/3010.167.45.169 – 10.167.45.17010.167.45.171
1210.167.45.172/3010.167.45.173 – 10.167.45.17410.167.45.175
1310.167.45.176/3010.167.45.177 – 10.167.45.17810.167.45.179
1410.167.45.180/3010.167.45.181 – 10.167.45.18210.167.45.183
1510.167.45.184/3010.167.45.185 – 10.167.45.18610.167.45.187
1610.167.45.188/3010.167.45.189 – 10.167.45.19010.167.45.191
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /26
/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-
/23255.255.254.0512510-
/24255.255.255.0256254-
/25255.255.255.128128126-
/26255.255.255.19264621
/27255.255.255.22432302 split →
/28255.255.255.24016144 split →
/29255.255.255.248868 split →
/30255.255.255.2524216 split →
/31255.255.255.2542232 split →
/32255.255.255.2551164 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 →