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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)10.167.129.160/27
network10.167.129.160/27
broadcast10.167.129.191
first host10.167.129.161
last host10.167.129.190
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.167.129.160/27
address00001010.10100111.10000001.10100000
subnet mask11111111.11111111.11111111.11100000
network00001010.10100111.10000001.10100000
broadcast00001010.10100111.10000001.10111111
green = network part, grey = host part
hex0x0aa781a0
decimal178749856
reverse dns160.129.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:81a0

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.129.160/3210.167.129.160 – 10.167.129.16010.167.129.160
210.167.129.161/3210.167.129.161 – 10.167.129.16110.167.129.161
310.167.129.162/3210.167.129.162 – 10.167.129.16210.167.129.162
410.167.129.163/3210.167.129.163 – 10.167.129.16310.167.129.163
510.167.129.164/3210.167.129.164 – 10.167.129.16410.167.129.164
610.167.129.165/3210.167.129.165 – 10.167.129.16510.167.129.165
710.167.129.166/3210.167.129.166 – 10.167.129.16610.167.129.166
810.167.129.167/3210.167.129.167 – 10.167.129.16710.167.129.167
910.167.129.168/3210.167.129.168 – 10.167.129.16810.167.129.168
1010.167.129.169/3210.167.129.169 – 10.167.129.16910.167.129.169
1110.167.129.170/3210.167.129.170 – 10.167.129.17010.167.129.170
1210.167.129.171/3210.167.129.171 – 10.167.129.17110.167.129.171
1310.167.129.172/3210.167.129.172 – 10.167.129.17210.167.129.172
1410.167.129.173/3210.167.129.173 – 10.167.129.17310.167.129.173
1510.167.129.174/3210.167.129.174 – 10.167.129.17410.167.129.174
1610.167.129.175/3210.167.129.175 – 10.167.129.17510.167.129.175
1710.167.129.176/3210.167.129.176 – 10.167.129.17610.167.129.176
1810.167.129.177/3210.167.129.177 – 10.167.129.17710.167.129.177
1910.167.129.178/3210.167.129.178 – 10.167.129.17810.167.129.178
2010.167.129.179/3210.167.129.179 – 10.167.129.17910.167.129.179
2110.167.129.180/3210.167.129.180 – 10.167.129.18010.167.129.180
2210.167.129.181/3210.167.129.181 – 10.167.129.18110.167.129.181
2310.167.129.182/3210.167.129.182 – 10.167.129.18210.167.129.182
2410.167.129.183/3210.167.129.183 – 10.167.129.18310.167.129.183
2510.167.129.184/3210.167.129.184 – 10.167.129.18410.167.129.184
2610.167.129.185/3210.167.129.185 – 10.167.129.18510.167.129.185
2710.167.129.186/3210.167.129.186 – 10.167.129.18610.167.129.186
2810.167.129.187/3210.167.129.187 – 10.167.129.18710.167.129.187
2910.167.129.188/3210.167.129.188 – 10.167.129.18810.167.129.188
3010.167.129.189/3210.167.129.189 – 10.167.129.18910.167.129.189
3110.167.129.190/3210.167.129.190 – 10.167.129.19010.167.129.190
3210.167.129.191/3210.167.129.191 – 10.167.129.19110.167.129.191
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 →