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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)10.0.6.160/27
network10.0.6.160/27
broadcast10.0.6.191
first host10.0.6.161
last host10.0.6.190
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.0.6.160/27
address00001010.00000000.00000110.10100000
subnet mask11111111.11111111.11111111.11100000
network00001010.00000000.00000110.10100000
broadcast00001010.00000000.00000110.10111111
green = network part, grey = host part
hex0x0a0006a0
decimal167773856
reverse dns160.6.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:6a0

/27 split into /31 · 16 subnets

close ×
#networkhost rangebroadcast
110.0.6.160/3110.0.6.160 – 10.0.6.16110.0.6.161
210.0.6.162/3110.0.6.162 – 10.0.6.16310.0.6.163
310.0.6.164/3110.0.6.164 – 10.0.6.16510.0.6.165
410.0.6.166/3110.0.6.166 – 10.0.6.16710.0.6.167
510.0.6.168/3110.0.6.168 – 10.0.6.16910.0.6.169
610.0.6.170/3110.0.6.170 – 10.0.6.17110.0.6.171
710.0.6.172/3110.0.6.172 – 10.0.6.17310.0.6.173
810.0.6.174/3110.0.6.174 – 10.0.6.17510.0.6.175
910.0.6.176/3110.0.6.176 – 10.0.6.17710.0.6.177
1010.0.6.178/3110.0.6.178 – 10.0.6.17910.0.6.179
1110.0.6.180/3110.0.6.180 – 10.0.6.18110.0.6.181
1210.0.6.182/3110.0.6.182 – 10.0.6.18310.0.6.183
1310.0.6.184/3110.0.6.184 – 10.0.6.18510.0.6.185
1410.0.6.186/3110.0.6.186 – 10.0.6.18710.0.6.187
1510.0.6.188/3110.0.6.188 – 10.0.6.18910.0.6.189
1610.0.6.190/3110.0.6.190 – 10.0.6.19110.0.6.191
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 →