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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)172.16.1.96/27
network172.16.1.96/27
broadcast172.16.1.127
first host172.16.1.97
last host172.16.1.126
subnet mask255.255.255.224
wildcard0.0.0.31
addresses32
usable hosts30
classB
ipcalc 172.16.1.96/27
address10101100.00010000.00000001.01100000
subnet mask11111111.11111111.11111111.11100000
network10101100.00010000.00000001.01100000
broadcast10101100.00010000.00000001.01111111
green = network part, grey = host part
hex0xac100160
decimal2886730080
reverse dns96.1.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:160

/27 split into /32 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.1.96/32172.16.1.96 – 172.16.1.96172.16.1.96
2172.16.1.97/32172.16.1.97 – 172.16.1.97172.16.1.97
3172.16.1.98/32172.16.1.98 – 172.16.1.98172.16.1.98
4172.16.1.99/32172.16.1.99 – 172.16.1.99172.16.1.99
5172.16.1.100/32172.16.1.100 – 172.16.1.100172.16.1.100
6172.16.1.101/32172.16.1.101 – 172.16.1.101172.16.1.101
7172.16.1.102/32172.16.1.102 – 172.16.1.102172.16.1.102
8172.16.1.103/32172.16.1.103 – 172.16.1.103172.16.1.103
9172.16.1.104/32172.16.1.104 – 172.16.1.104172.16.1.104
10172.16.1.105/32172.16.1.105 – 172.16.1.105172.16.1.105
11172.16.1.106/32172.16.1.106 – 172.16.1.106172.16.1.106
12172.16.1.107/32172.16.1.107 – 172.16.1.107172.16.1.107
13172.16.1.108/32172.16.1.108 – 172.16.1.108172.16.1.108
14172.16.1.109/32172.16.1.109 – 172.16.1.109172.16.1.109
15172.16.1.110/32172.16.1.110 – 172.16.1.110172.16.1.110
16172.16.1.111/32172.16.1.111 – 172.16.1.111172.16.1.111
17172.16.1.112/32172.16.1.112 – 172.16.1.112172.16.1.112
18172.16.1.113/32172.16.1.113 – 172.16.1.113172.16.1.113
19172.16.1.114/32172.16.1.114 – 172.16.1.114172.16.1.114
20172.16.1.115/32172.16.1.115 – 172.16.1.115172.16.1.115
21172.16.1.116/32172.16.1.116 – 172.16.1.116172.16.1.116
22172.16.1.117/32172.16.1.117 – 172.16.1.117172.16.1.117
23172.16.1.118/32172.16.1.118 – 172.16.1.118172.16.1.118
24172.16.1.119/32172.16.1.119 – 172.16.1.119172.16.1.119
25172.16.1.120/32172.16.1.120 – 172.16.1.120172.16.1.120
26172.16.1.121/32172.16.1.121 – 172.16.1.121172.16.1.121
27172.16.1.122/32172.16.1.122 – 172.16.1.122172.16.1.122
28172.16.1.123/32172.16.1.123 – 172.16.1.123172.16.1.123
29172.16.1.124/32172.16.1.124 – 172.16.1.124172.16.1.124
30172.16.1.125/32172.16.1.125 – 172.16.1.125172.16.1.125
31172.16.1.126/32172.16.1.126 – 172.16.1.126172.16.1.126
32172.16.1.127/32172.16.1.127 – 172.16.1.127172.16.1.127
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 →