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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)10.30.57.128/26
network10.30.57.128/26
broadcast10.30.57.191
first host10.30.57.129
last host10.30.57.190
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.30.57.128/26
address00001010.00011110.00111001.10000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00011110.00111001.10000000
broadcast00001010.00011110.00111001.10111111
green = network part, grey = host part
hex0x0a1e3980
decimal169752960
reverse dns128.57.30.10.in-addr.arpa
ipv4-mapped::ffff:a1e:3980

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.30.57.128/3110.30.57.128 – 10.30.57.12910.30.57.129
210.30.57.130/3110.30.57.130 – 10.30.57.13110.30.57.131
310.30.57.132/3110.30.57.132 – 10.30.57.13310.30.57.133
410.30.57.134/3110.30.57.134 – 10.30.57.13510.30.57.135
510.30.57.136/3110.30.57.136 – 10.30.57.13710.30.57.137
610.30.57.138/3110.30.57.138 – 10.30.57.13910.30.57.139
710.30.57.140/3110.30.57.140 – 10.30.57.14110.30.57.141
810.30.57.142/3110.30.57.142 – 10.30.57.14310.30.57.143
910.30.57.144/3110.30.57.144 – 10.30.57.14510.30.57.145
1010.30.57.146/3110.30.57.146 – 10.30.57.14710.30.57.147
1110.30.57.148/3110.30.57.148 – 10.30.57.14910.30.57.149
1210.30.57.150/3110.30.57.150 – 10.30.57.15110.30.57.151
1310.30.57.152/3110.30.57.152 – 10.30.57.15310.30.57.153
1410.30.57.154/3110.30.57.154 – 10.30.57.15510.30.57.155
1510.30.57.156/3110.30.57.156 – 10.30.57.15710.30.57.157
1610.30.57.158/3110.30.57.158 – 10.30.57.15910.30.57.159
1710.30.57.160/3110.30.57.160 – 10.30.57.16110.30.57.161
1810.30.57.162/3110.30.57.162 – 10.30.57.16310.30.57.163
1910.30.57.164/3110.30.57.164 – 10.30.57.16510.30.57.165
2010.30.57.166/3110.30.57.166 – 10.30.57.16710.30.57.167
2110.30.57.168/3110.30.57.168 – 10.30.57.16910.30.57.169
2210.30.57.170/3110.30.57.170 – 10.30.57.17110.30.57.171
2310.30.57.172/3110.30.57.172 – 10.30.57.17310.30.57.173
2410.30.57.174/3110.30.57.174 – 10.30.57.17510.30.57.175
2510.30.57.176/3110.30.57.176 – 10.30.57.17710.30.57.177
2610.30.57.178/3110.30.57.178 – 10.30.57.17910.30.57.179
2710.30.57.180/3110.30.57.180 – 10.30.57.18110.30.57.181
2810.30.57.182/3110.30.57.182 – 10.30.57.18310.30.57.183
2910.30.57.184/3110.30.57.184 – 10.30.57.18510.30.57.185
3010.30.57.186/3110.30.57.186 – 10.30.57.18710.30.57.187
3110.30.57.188/3110.30.57.188 – 10.30.57.18910.30.57.189
3210.30.57.190/3110.30.57.190 – 10.30.57.19110.30.57.191
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 →