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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)10.167.13.128/27
network10.167.13.128/27
broadcast10.167.13.159
first host10.167.13.129
last host10.167.13.158
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.167.13.128/27
address00001010.10100111.00001101.10000000
subnet mask11111111.11111111.11111111.11100000
network00001010.10100111.00001101.10000000
broadcast00001010.10100111.00001101.10011111
green = network part, grey = host part
hex0x0aa70d80
decimal178720128
reverse dns128.13.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:d80

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.13.128/3210.167.13.128 – 10.167.13.12810.167.13.128
210.167.13.129/3210.167.13.129 – 10.167.13.12910.167.13.129
310.167.13.130/3210.167.13.130 – 10.167.13.13010.167.13.130
410.167.13.131/3210.167.13.131 – 10.167.13.13110.167.13.131
510.167.13.132/3210.167.13.132 – 10.167.13.13210.167.13.132
610.167.13.133/3210.167.13.133 – 10.167.13.13310.167.13.133
710.167.13.134/3210.167.13.134 – 10.167.13.13410.167.13.134
810.167.13.135/3210.167.13.135 – 10.167.13.13510.167.13.135
910.167.13.136/3210.167.13.136 – 10.167.13.13610.167.13.136
1010.167.13.137/3210.167.13.137 – 10.167.13.13710.167.13.137
1110.167.13.138/3210.167.13.138 – 10.167.13.13810.167.13.138
1210.167.13.139/3210.167.13.139 – 10.167.13.13910.167.13.139
1310.167.13.140/3210.167.13.140 – 10.167.13.14010.167.13.140
1410.167.13.141/3210.167.13.141 – 10.167.13.14110.167.13.141
1510.167.13.142/3210.167.13.142 – 10.167.13.14210.167.13.142
1610.167.13.143/3210.167.13.143 – 10.167.13.14310.167.13.143
1710.167.13.144/3210.167.13.144 – 10.167.13.14410.167.13.144
1810.167.13.145/3210.167.13.145 – 10.167.13.14510.167.13.145
1910.167.13.146/3210.167.13.146 – 10.167.13.14610.167.13.146
2010.167.13.147/3210.167.13.147 – 10.167.13.14710.167.13.147
2110.167.13.148/3210.167.13.148 – 10.167.13.14810.167.13.148
2210.167.13.149/3210.167.13.149 – 10.167.13.14910.167.13.149
2310.167.13.150/3210.167.13.150 – 10.167.13.15010.167.13.150
2410.167.13.151/3210.167.13.151 – 10.167.13.15110.167.13.151
2510.167.13.152/3210.167.13.152 – 10.167.13.15210.167.13.152
2610.167.13.153/3210.167.13.153 – 10.167.13.15310.167.13.153
2710.167.13.154/3210.167.13.154 – 10.167.13.15410.167.13.154
2810.167.13.155/3210.167.13.155 – 10.167.13.15510.167.13.155
2910.167.13.156/3210.167.13.156 – 10.167.13.15610.167.13.156
3010.167.13.157/3210.167.13.157 – 10.167.13.15710.167.13.157
3110.167.13.158/3210.167.13.158 – 10.167.13.15810.167.13.158
3210.167.13.159/3210.167.13.159 – 10.167.13.15910.167.13.159
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 →