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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)10.0.45.64/26
network10.0.45.64/26
broadcast10.0.45.127
first host10.0.45.65
last host10.0.45.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.0.45.64/26
address00001010.00000000.00101101.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000000.00101101.01000000
broadcast00001010.00000000.00101101.01111111
green = network part, grey = host part
hex0x0a002d40
decimal167783744
reverse dns64.45.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:2d40

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.0.45.64/3110.0.45.64 – 10.0.45.6510.0.45.65
210.0.45.66/3110.0.45.66 – 10.0.45.6710.0.45.67
310.0.45.68/3110.0.45.68 – 10.0.45.6910.0.45.69
410.0.45.70/3110.0.45.70 – 10.0.45.7110.0.45.71
510.0.45.72/3110.0.45.72 – 10.0.45.7310.0.45.73
610.0.45.74/3110.0.45.74 – 10.0.45.7510.0.45.75
710.0.45.76/3110.0.45.76 – 10.0.45.7710.0.45.77
810.0.45.78/3110.0.45.78 – 10.0.45.7910.0.45.79
910.0.45.80/3110.0.45.80 – 10.0.45.8110.0.45.81
1010.0.45.82/3110.0.45.82 – 10.0.45.8310.0.45.83
1110.0.45.84/3110.0.45.84 – 10.0.45.8510.0.45.85
1210.0.45.86/3110.0.45.86 – 10.0.45.8710.0.45.87
1310.0.45.88/3110.0.45.88 – 10.0.45.8910.0.45.89
1410.0.45.90/3110.0.45.90 – 10.0.45.9110.0.45.91
1510.0.45.92/3110.0.45.92 – 10.0.45.9310.0.45.93
1610.0.45.94/3110.0.45.94 – 10.0.45.9510.0.45.95
1710.0.45.96/3110.0.45.96 – 10.0.45.9710.0.45.97
1810.0.45.98/3110.0.45.98 – 10.0.45.9910.0.45.99
1910.0.45.100/3110.0.45.100 – 10.0.45.10110.0.45.101
2010.0.45.102/3110.0.45.102 – 10.0.45.10310.0.45.103
2110.0.45.104/3110.0.45.104 – 10.0.45.10510.0.45.105
2210.0.45.106/3110.0.45.106 – 10.0.45.10710.0.45.107
2310.0.45.108/3110.0.45.108 – 10.0.45.10910.0.45.109
2410.0.45.110/3110.0.45.110 – 10.0.45.11110.0.45.111
2510.0.45.112/3110.0.45.112 – 10.0.45.11310.0.45.113
2610.0.45.114/3110.0.45.114 – 10.0.45.11510.0.45.115
2710.0.45.116/3110.0.45.116 – 10.0.45.11710.0.45.117
2810.0.45.118/3110.0.45.118 – 10.0.45.11910.0.45.119
2910.0.45.120/3110.0.45.120 – 10.0.45.12110.0.45.121
3010.0.45.122/3110.0.45.122 – 10.0.45.12310.0.45.123
3110.0.45.124/3110.0.45.124 – 10.0.45.12510.0.45.125
3210.0.45.126/3110.0.45.126 – 10.0.45.12710.0.45.127
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 →