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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)172.16.13.64/26
network172.16.13.64/26
broadcast172.16.13.127
first host172.16.13.65
last host172.16.13.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classB
ipcalc 172.16.13.64/26
address10101100.00010000.00001101.01000000
subnet mask11111111.11111111.11111111.11000000
network10101100.00010000.00001101.01000000
broadcast10101100.00010000.00001101.01111111
green = network part, grey = host part
hex0xac100d40
decimal2886733120
reverse dns64.13.16.172.in-addr.arpa
ipv4-mapped::ffff:ac10:d40

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
1172.16.13.64/31172.16.13.64 – 172.16.13.65172.16.13.65
2172.16.13.66/31172.16.13.66 – 172.16.13.67172.16.13.67
3172.16.13.68/31172.16.13.68 – 172.16.13.69172.16.13.69
4172.16.13.70/31172.16.13.70 – 172.16.13.71172.16.13.71
5172.16.13.72/31172.16.13.72 – 172.16.13.73172.16.13.73
6172.16.13.74/31172.16.13.74 – 172.16.13.75172.16.13.75
7172.16.13.76/31172.16.13.76 – 172.16.13.77172.16.13.77
8172.16.13.78/31172.16.13.78 – 172.16.13.79172.16.13.79
9172.16.13.80/31172.16.13.80 – 172.16.13.81172.16.13.81
10172.16.13.82/31172.16.13.82 – 172.16.13.83172.16.13.83
11172.16.13.84/31172.16.13.84 – 172.16.13.85172.16.13.85
12172.16.13.86/31172.16.13.86 – 172.16.13.87172.16.13.87
13172.16.13.88/31172.16.13.88 – 172.16.13.89172.16.13.89
14172.16.13.90/31172.16.13.90 – 172.16.13.91172.16.13.91
15172.16.13.92/31172.16.13.92 – 172.16.13.93172.16.13.93
16172.16.13.94/31172.16.13.94 – 172.16.13.95172.16.13.95
17172.16.13.96/31172.16.13.96 – 172.16.13.97172.16.13.97
18172.16.13.98/31172.16.13.98 – 172.16.13.99172.16.13.99
19172.16.13.100/31172.16.13.100 – 172.16.13.101172.16.13.101
20172.16.13.102/31172.16.13.102 – 172.16.13.103172.16.13.103
21172.16.13.104/31172.16.13.104 – 172.16.13.105172.16.13.105
22172.16.13.106/31172.16.13.106 – 172.16.13.107172.16.13.107
23172.16.13.108/31172.16.13.108 – 172.16.13.109172.16.13.109
24172.16.13.110/31172.16.13.110 – 172.16.13.111172.16.13.111
25172.16.13.112/31172.16.13.112 – 172.16.13.113172.16.13.113
26172.16.13.114/31172.16.13.114 – 172.16.13.115172.16.13.115
27172.16.13.116/31172.16.13.116 – 172.16.13.117172.16.13.117
28172.16.13.118/31172.16.13.118 – 172.16.13.119172.16.13.119
29172.16.13.120/31172.16.13.120 – 172.16.13.121172.16.13.121
30172.16.13.122/31172.16.13.122 – 172.16.13.123172.16.13.123
31172.16.13.124/31172.16.13.124 – 172.16.13.125172.16.13.125
32172.16.13.126/31172.16.13.126 – 172.16.13.127172.16.13.127
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 →