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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)10.0.43.128/26
network10.0.43.128/26
broadcast10.0.43.191
first host10.0.43.129
last host10.0.43.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.0.43.128/26
address00001010.00000000.00101011.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000000.00101011.10000000
broadcast00001010.00000000.00101011.10111111
green = network part, grey = host part
hex0x0a002b80
decimal167783296
reverse dns128.43.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:2b80

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.0.43.128/3110.0.43.128 – 10.0.43.12910.0.43.129
210.0.43.130/3110.0.43.130 – 10.0.43.13110.0.43.131
310.0.43.132/3110.0.43.132 – 10.0.43.13310.0.43.133
410.0.43.134/3110.0.43.134 – 10.0.43.13510.0.43.135
510.0.43.136/3110.0.43.136 – 10.0.43.13710.0.43.137
610.0.43.138/3110.0.43.138 – 10.0.43.13910.0.43.139
710.0.43.140/3110.0.43.140 – 10.0.43.14110.0.43.141
810.0.43.142/3110.0.43.142 – 10.0.43.14310.0.43.143
910.0.43.144/3110.0.43.144 – 10.0.43.14510.0.43.145
1010.0.43.146/3110.0.43.146 – 10.0.43.14710.0.43.147
1110.0.43.148/3110.0.43.148 – 10.0.43.14910.0.43.149
1210.0.43.150/3110.0.43.150 – 10.0.43.15110.0.43.151
1310.0.43.152/3110.0.43.152 – 10.0.43.15310.0.43.153
1410.0.43.154/3110.0.43.154 – 10.0.43.15510.0.43.155
1510.0.43.156/3110.0.43.156 – 10.0.43.15710.0.43.157
1610.0.43.158/3110.0.43.158 – 10.0.43.15910.0.43.159
1710.0.43.160/3110.0.43.160 – 10.0.43.16110.0.43.161
1810.0.43.162/3110.0.43.162 – 10.0.43.16310.0.43.163
1910.0.43.164/3110.0.43.164 – 10.0.43.16510.0.43.165
2010.0.43.166/3110.0.43.166 – 10.0.43.16710.0.43.167
2110.0.43.168/3110.0.43.168 – 10.0.43.16910.0.43.169
2210.0.43.170/3110.0.43.170 – 10.0.43.17110.0.43.171
2310.0.43.172/3110.0.43.172 – 10.0.43.17310.0.43.173
2410.0.43.174/3110.0.43.174 – 10.0.43.17510.0.43.175
2510.0.43.176/3110.0.43.176 – 10.0.43.17710.0.43.177
2610.0.43.178/3110.0.43.178 – 10.0.43.17910.0.43.179
2710.0.43.180/3110.0.43.180 – 10.0.43.18110.0.43.181
2810.0.43.182/3110.0.43.182 – 10.0.43.18310.0.43.183
2910.0.43.184/3110.0.43.184 – 10.0.43.18510.0.43.185
3010.0.43.186/3110.0.43.186 – 10.0.43.18710.0.43.187
3110.0.43.188/3110.0.43.188 – 10.0.43.18910.0.43.189
3210.0.43.190/3110.0.43.190 – 10.0.43.19110.0.43.191
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 →