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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)10.131.7.128/27
network10.131.7.128/27
broadcast10.131.7.159
first host10.131.7.129
last host10.131.7.158
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.131.7.128/27
address00001010.10000011.00000111.10000000
subnet mask11111111.11111111.11111111.11100000
network00001010.10000011.00000111.10000000
broadcast00001010.10000011.00000111.10011111
green = network part, grey = host part
hex0x0a830780
decimal176359296
reverse dns128.7.131.10.in-addr.arpa
ipv4-mapped::ffff:a83:780

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.131.7.128/3210.131.7.128 – 10.131.7.12810.131.7.128
210.131.7.129/3210.131.7.129 – 10.131.7.12910.131.7.129
310.131.7.130/3210.131.7.130 – 10.131.7.13010.131.7.130
410.131.7.131/3210.131.7.131 – 10.131.7.13110.131.7.131
510.131.7.132/3210.131.7.132 – 10.131.7.13210.131.7.132
610.131.7.133/3210.131.7.133 – 10.131.7.13310.131.7.133
710.131.7.134/3210.131.7.134 – 10.131.7.13410.131.7.134
810.131.7.135/3210.131.7.135 – 10.131.7.13510.131.7.135
910.131.7.136/3210.131.7.136 – 10.131.7.13610.131.7.136
1010.131.7.137/3210.131.7.137 – 10.131.7.13710.131.7.137
1110.131.7.138/3210.131.7.138 – 10.131.7.13810.131.7.138
1210.131.7.139/3210.131.7.139 – 10.131.7.13910.131.7.139
1310.131.7.140/3210.131.7.140 – 10.131.7.14010.131.7.140
1410.131.7.141/3210.131.7.141 – 10.131.7.14110.131.7.141
1510.131.7.142/3210.131.7.142 – 10.131.7.14210.131.7.142
1610.131.7.143/3210.131.7.143 – 10.131.7.14310.131.7.143
1710.131.7.144/3210.131.7.144 – 10.131.7.14410.131.7.144
1810.131.7.145/3210.131.7.145 – 10.131.7.14510.131.7.145
1910.131.7.146/3210.131.7.146 – 10.131.7.14610.131.7.146
2010.131.7.147/3210.131.7.147 – 10.131.7.14710.131.7.147
2110.131.7.148/3210.131.7.148 – 10.131.7.14810.131.7.148
2210.131.7.149/3210.131.7.149 – 10.131.7.14910.131.7.149
2310.131.7.150/3210.131.7.150 – 10.131.7.15010.131.7.150
2410.131.7.151/3210.131.7.151 – 10.131.7.15110.131.7.151
2510.131.7.152/3210.131.7.152 – 10.131.7.15210.131.7.152
2610.131.7.153/3210.131.7.153 – 10.131.7.15310.131.7.153
2710.131.7.154/3210.131.7.154 – 10.131.7.15410.131.7.154
2810.131.7.155/3210.131.7.155 – 10.131.7.15510.131.7.155
2910.131.7.156/3210.131.7.156 – 10.131.7.15610.131.7.156
3010.131.7.157/3210.131.7.157 – 10.131.7.15710.131.7.157
3110.131.7.158/3210.131.7.158 – 10.131.7.15810.131.7.158
3210.131.7.159/3210.131.7.159 – 10.131.7.15910.131.7.159
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 →