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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)10.2.185.128/26
network10.2.185.128/26
broadcast10.2.185.191
first host10.2.185.129
last host10.2.185.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.185.128/26
address00001010.00000010.10111001.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.10111001.10000000
broadcast00001010.00000010.10111001.10111111
green = network part, grey = host part
hex0x0a02b980
decimal167950720
reverse dns128.185.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:b980

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.185.128/3110.2.185.128 – 10.2.185.12910.2.185.129
210.2.185.130/3110.2.185.130 – 10.2.185.13110.2.185.131
310.2.185.132/3110.2.185.132 – 10.2.185.13310.2.185.133
410.2.185.134/3110.2.185.134 – 10.2.185.13510.2.185.135
510.2.185.136/3110.2.185.136 – 10.2.185.13710.2.185.137
610.2.185.138/3110.2.185.138 – 10.2.185.13910.2.185.139
710.2.185.140/3110.2.185.140 – 10.2.185.14110.2.185.141
810.2.185.142/3110.2.185.142 – 10.2.185.14310.2.185.143
910.2.185.144/3110.2.185.144 – 10.2.185.14510.2.185.145
1010.2.185.146/3110.2.185.146 – 10.2.185.14710.2.185.147
1110.2.185.148/3110.2.185.148 – 10.2.185.14910.2.185.149
1210.2.185.150/3110.2.185.150 – 10.2.185.15110.2.185.151
1310.2.185.152/3110.2.185.152 – 10.2.185.15310.2.185.153
1410.2.185.154/3110.2.185.154 – 10.2.185.15510.2.185.155
1510.2.185.156/3110.2.185.156 – 10.2.185.15710.2.185.157
1610.2.185.158/3110.2.185.158 – 10.2.185.15910.2.185.159
1710.2.185.160/3110.2.185.160 – 10.2.185.16110.2.185.161
1810.2.185.162/3110.2.185.162 – 10.2.185.16310.2.185.163
1910.2.185.164/3110.2.185.164 – 10.2.185.16510.2.185.165
2010.2.185.166/3110.2.185.166 – 10.2.185.16710.2.185.167
2110.2.185.168/3110.2.185.168 – 10.2.185.16910.2.185.169
2210.2.185.170/3110.2.185.170 – 10.2.185.17110.2.185.171
2310.2.185.172/3110.2.185.172 – 10.2.185.17310.2.185.173
2410.2.185.174/3110.2.185.174 – 10.2.185.17510.2.185.175
2510.2.185.176/3110.2.185.176 – 10.2.185.17710.2.185.177
2610.2.185.178/3110.2.185.178 – 10.2.185.17910.2.185.179
2710.2.185.180/3110.2.185.180 – 10.2.185.18110.2.185.181
2810.2.185.182/3110.2.185.182 – 10.2.185.18310.2.185.183
2910.2.185.184/3110.2.185.184 – 10.2.185.18510.2.185.185
3010.2.185.186/3110.2.185.186 – 10.2.185.18710.2.185.187
3110.2.185.188/3110.2.185.188 – 10.2.185.18910.2.185.189
3210.2.185.190/3110.2.185.190 – 10.2.185.19110.2.185.191
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 →