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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)10.3.78.64/26
network10.3.78.64/26
broadcast10.3.78.127
first host10.3.78.65
last host10.3.78.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.78.64/26
address00001010.00000011.01001110.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.01001110.01000000
broadcast00001010.00000011.01001110.01111111
green = network part, grey = host part
hex0x0a034e40
decimal167988800
reverse dns64.78.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:4e40

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.78.64/3110.3.78.64 – 10.3.78.6510.3.78.65
210.3.78.66/3110.3.78.66 – 10.3.78.6710.3.78.67
310.3.78.68/3110.3.78.68 – 10.3.78.6910.3.78.69
410.3.78.70/3110.3.78.70 – 10.3.78.7110.3.78.71
510.3.78.72/3110.3.78.72 – 10.3.78.7310.3.78.73
610.3.78.74/3110.3.78.74 – 10.3.78.7510.3.78.75
710.3.78.76/3110.3.78.76 – 10.3.78.7710.3.78.77
810.3.78.78/3110.3.78.78 – 10.3.78.7910.3.78.79
910.3.78.80/3110.3.78.80 – 10.3.78.8110.3.78.81
1010.3.78.82/3110.3.78.82 – 10.3.78.8310.3.78.83
1110.3.78.84/3110.3.78.84 – 10.3.78.8510.3.78.85
1210.3.78.86/3110.3.78.86 – 10.3.78.8710.3.78.87
1310.3.78.88/3110.3.78.88 – 10.3.78.8910.3.78.89
1410.3.78.90/3110.3.78.90 – 10.3.78.9110.3.78.91
1510.3.78.92/3110.3.78.92 – 10.3.78.9310.3.78.93
1610.3.78.94/3110.3.78.94 – 10.3.78.9510.3.78.95
1710.3.78.96/3110.3.78.96 – 10.3.78.9710.3.78.97
1810.3.78.98/3110.3.78.98 – 10.3.78.9910.3.78.99
1910.3.78.100/3110.3.78.100 – 10.3.78.10110.3.78.101
2010.3.78.102/3110.3.78.102 – 10.3.78.10310.3.78.103
2110.3.78.104/3110.3.78.104 – 10.3.78.10510.3.78.105
2210.3.78.106/3110.3.78.106 – 10.3.78.10710.3.78.107
2310.3.78.108/3110.3.78.108 – 10.3.78.10910.3.78.109
2410.3.78.110/3110.3.78.110 – 10.3.78.11110.3.78.111
2510.3.78.112/3110.3.78.112 – 10.3.78.11310.3.78.113
2610.3.78.114/3110.3.78.114 – 10.3.78.11510.3.78.115
2710.3.78.116/3110.3.78.116 – 10.3.78.11710.3.78.117
2810.3.78.118/3110.3.78.118 – 10.3.78.11910.3.78.119
2910.3.78.120/3110.3.78.120 – 10.3.78.12110.3.78.121
3010.3.78.122/3110.3.78.122 – 10.3.78.12310.3.78.123
3110.3.78.124/3110.3.78.124 – 10.3.78.12510.3.78.125
3210.3.78.126/3110.3.78.126 – 10.3.78.12710.3.78.127
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 →