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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)10.167.245.128/27
network10.167.245.128/27
broadcast10.167.245.159
first host10.167.245.129
last host10.167.245.158
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classA
ipcalc 10.167.245.128/27
address00001010.10100111.11110101.10000000
subnet mask11111111.11111111.11111111.11100000
network00001010.10100111.11110101.10000000
broadcast00001010.10100111.11110101.10011111
green = network part, grey = host part
hex0x0aa7f580
decimal178779520
reverse dns128.245.167.10.in-addr.arpa
ipv4-mapped::ffff:aa7:f580

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
110.167.245.128/3210.167.245.128 – 10.167.245.12810.167.245.128
210.167.245.129/3210.167.245.129 – 10.167.245.12910.167.245.129
310.167.245.130/3210.167.245.130 – 10.167.245.13010.167.245.130
410.167.245.131/3210.167.245.131 – 10.167.245.13110.167.245.131
510.167.245.132/3210.167.245.132 – 10.167.245.13210.167.245.132
610.167.245.133/3210.167.245.133 – 10.167.245.13310.167.245.133
710.167.245.134/3210.167.245.134 – 10.167.245.13410.167.245.134
810.167.245.135/3210.167.245.135 – 10.167.245.13510.167.245.135
910.167.245.136/3210.167.245.136 – 10.167.245.13610.167.245.136
1010.167.245.137/3210.167.245.137 – 10.167.245.13710.167.245.137
1110.167.245.138/3210.167.245.138 – 10.167.245.13810.167.245.138
1210.167.245.139/3210.167.245.139 – 10.167.245.13910.167.245.139
1310.167.245.140/3210.167.245.140 – 10.167.245.14010.167.245.140
1410.167.245.141/3210.167.245.141 – 10.167.245.14110.167.245.141
1510.167.245.142/3210.167.245.142 – 10.167.245.14210.167.245.142
1610.167.245.143/3210.167.245.143 – 10.167.245.14310.167.245.143
1710.167.245.144/3210.167.245.144 – 10.167.245.14410.167.245.144
1810.167.245.145/3210.167.245.145 – 10.167.245.14510.167.245.145
1910.167.245.146/3210.167.245.146 – 10.167.245.14610.167.245.146
2010.167.245.147/3210.167.245.147 – 10.167.245.14710.167.245.147
2110.167.245.148/3210.167.245.148 – 10.167.245.14810.167.245.148
2210.167.245.149/3210.167.245.149 – 10.167.245.14910.167.245.149
2310.167.245.150/3210.167.245.150 – 10.167.245.15010.167.245.150
2410.167.245.151/3210.167.245.151 – 10.167.245.15110.167.245.151
2510.167.245.152/3210.167.245.152 – 10.167.245.15210.167.245.152
2610.167.245.153/3210.167.245.153 – 10.167.245.15310.167.245.153
2710.167.245.154/3210.167.245.154 – 10.167.245.15410.167.245.154
2810.167.245.155/3210.167.245.155 – 10.167.245.15510.167.245.155
2910.167.245.156/3210.167.245.156 – 10.167.245.15610.167.245.156
3010.167.245.157/3210.167.245.157 – 10.167.245.15710.167.245.157
3110.167.245.158/3210.167.245.158 – 10.167.245.15810.167.245.158
3210.167.245.159/3210.167.245.159 – 10.167.245.15910.167.245.159
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 →