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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)10.3.158.64/26
network10.3.158.64/26
broadcast10.3.158.127
first host10.3.158.65
last host10.3.158.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.3.158.64/26
address00001010.00000011.10011110.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000011.10011110.01000000
broadcast00001010.00000011.10011110.01111111
green = network part, grey = host part
hex0x0a039e40
decimal168009280
reverse dns64.158.3.10.in-addr.arpa
ipv4-mapped::ffff:a03:9e40

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.3.158.64/3110.3.158.64 – 10.3.158.6510.3.158.65
210.3.158.66/3110.3.158.66 – 10.3.158.6710.3.158.67
310.3.158.68/3110.3.158.68 – 10.3.158.6910.3.158.69
410.3.158.70/3110.3.158.70 – 10.3.158.7110.3.158.71
510.3.158.72/3110.3.158.72 – 10.3.158.7310.3.158.73
610.3.158.74/3110.3.158.74 – 10.3.158.7510.3.158.75
710.3.158.76/3110.3.158.76 – 10.3.158.7710.3.158.77
810.3.158.78/3110.3.158.78 – 10.3.158.7910.3.158.79
910.3.158.80/3110.3.158.80 – 10.3.158.8110.3.158.81
1010.3.158.82/3110.3.158.82 – 10.3.158.8310.3.158.83
1110.3.158.84/3110.3.158.84 – 10.3.158.8510.3.158.85
1210.3.158.86/3110.3.158.86 – 10.3.158.8710.3.158.87
1310.3.158.88/3110.3.158.88 – 10.3.158.8910.3.158.89
1410.3.158.90/3110.3.158.90 – 10.3.158.9110.3.158.91
1510.3.158.92/3110.3.158.92 – 10.3.158.9310.3.158.93
1610.3.158.94/3110.3.158.94 – 10.3.158.9510.3.158.95
1710.3.158.96/3110.3.158.96 – 10.3.158.9710.3.158.97
1810.3.158.98/3110.3.158.98 – 10.3.158.9910.3.158.99
1910.3.158.100/3110.3.158.100 – 10.3.158.10110.3.158.101
2010.3.158.102/3110.3.158.102 – 10.3.158.10310.3.158.103
2110.3.158.104/3110.3.158.104 – 10.3.158.10510.3.158.105
2210.3.158.106/3110.3.158.106 – 10.3.158.10710.3.158.107
2310.3.158.108/3110.3.158.108 – 10.3.158.10910.3.158.109
2410.3.158.110/3110.3.158.110 – 10.3.158.11110.3.158.111
2510.3.158.112/3110.3.158.112 – 10.3.158.11310.3.158.113
2610.3.158.114/3110.3.158.114 – 10.3.158.11510.3.158.115
2710.3.158.116/3110.3.158.116 – 10.3.158.11710.3.158.117
2810.3.158.118/3110.3.158.118 – 10.3.158.11910.3.158.119
2910.3.158.120/3110.3.158.120 – 10.3.158.12110.3.158.121
3010.3.158.122/3110.3.158.122 – 10.3.158.12310.3.158.123
3110.3.158.124/3110.3.158.124 – 10.3.158.12510.3.158.125
3210.3.158.126/3110.3.158.126 – 10.3.158.12710.3.158.127
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 →