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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)10.167.239.128/27
network10.167.239.128/27
broadcast10.167.239.159
first host10.167.239.129
last host10.167.239.158
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.167.239.128/27
address00001010.10100111.11101111.10000000
subnet mask11111111.11111111.11111111.11100000
network00001010.10100111.11101111.10000000
broadcast00001010.10100111.11101111.10011111
green = network part, grey = host part
hex0x0aa7ef80
decimal178777984
reverse dns128.239.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:ef80

/27 split into /31 · 16 subnets

close ×
#networkhost rangebroadcast
110.167.239.128/3110.167.239.128 – 10.167.239.12910.167.239.129
210.167.239.130/3110.167.239.130 – 10.167.239.13110.167.239.131
310.167.239.132/3110.167.239.132 – 10.167.239.13310.167.239.133
410.167.239.134/3110.167.239.134 – 10.167.239.13510.167.239.135
510.167.239.136/3110.167.239.136 – 10.167.239.13710.167.239.137
610.167.239.138/3110.167.239.138 – 10.167.239.13910.167.239.139
710.167.239.140/3110.167.239.140 – 10.167.239.14110.167.239.141
810.167.239.142/3110.167.239.142 – 10.167.239.14310.167.239.143
910.167.239.144/3110.167.239.144 – 10.167.239.14510.167.239.145
1010.167.239.146/3110.167.239.146 – 10.167.239.14710.167.239.147
1110.167.239.148/3110.167.239.148 – 10.167.239.14910.167.239.149
1210.167.239.150/3110.167.239.150 – 10.167.239.15110.167.239.151
1310.167.239.152/3110.167.239.152 – 10.167.239.15310.167.239.153
1410.167.239.154/3110.167.239.154 – 10.167.239.15510.167.239.155
1510.167.239.156/3110.167.239.156 – 10.167.239.15710.167.239.157
1610.167.239.158/3110.167.239.158 – 10.167.239.15910.167.239.159
01 / table

IPv4 CIDR prefix table.

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

prefixsubnet maskaddresseshostsin your /27
/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-
/26255.255.255.1926462-
/27255.255.255.22432301
/28255.255.255.24016142 split →
/29255.255.255.248864 split →
/30255.255.255.252428 split →
/31255.255.255.2542216 split →
/32255.255.255.2551132 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 →