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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)10.2.187.64/26
network10.2.187.64/26
broadcast10.2.187.127
first host10.2.187.65
last host10.2.187.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.187.64/26
address00001010.00000010.10111011.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.10111011.01000000
broadcast00001010.00000010.10111011.01111111
green = network part, grey = host part
hex0x0a02bb40
decimal167951168
reverse dns64.187.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:bb40

/26 split into /31 · 32 subnets

close ×
#networkhost rangebroadcast
110.2.187.64/3110.2.187.64 – 10.2.187.6510.2.187.65
210.2.187.66/3110.2.187.66 – 10.2.187.6710.2.187.67
310.2.187.68/3110.2.187.68 – 10.2.187.6910.2.187.69
410.2.187.70/3110.2.187.70 – 10.2.187.7110.2.187.71
510.2.187.72/3110.2.187.72 – 10.2.187.7310.2.187.73
610.2.187.74/3110.2.187.74 – 10.2.187.7510.2.187.75
710.2.187.76/3110.2.187.76 – 10.2.187.7710.2.187.77
810.2.187.78/3110.2.187.78 – 10.2.187.7910.2.187.79
910.2.187.80/3110.2.187.80 – 10.2.187.8110.2.187.81
1010.2.187.82/3110.2.187.82 – 10.2.187.8310.2.187.83
1110.2.187.84/3110.2.187.84 – 10.2.187.8510.2.187.85
1210.2.187.86/3110.2.187.86 – 10.2.187.8710.2.187.87
1310.2.187.88/3110.2.187.88 – 10.2.187.8910.2.187.89
1410.2.187.90/3110.2.187.90 – 10.2.187.9110.2.187.91
1510.2.187.92/3110.2.187.92 – 10.2.187.9310.2.187.93
1610.2.187.94/3110.2.187.94 – 10.2.187.9510.2.187.95
1710.2.187.96/3110.2.187.96 – 10.2.187.9710.2.187.97
1810.2.187.98/3110.2.187.98 – 10.2.187.9910.2.187.99
1910.2.187.100/3110.2.187.100 – 10.2.187.10110.2.187.101
2010.2.187.102/3110.2.187.102 – 10.2.187.10310.2.187.103
2110.2.187.104/3110.2.187.104 – 10.2.187.10510.2.187.105
2210.2.187.106/3110.2.187.106 – 10.2.187.10710.2.187.107
2310.2.187.108/3110.2.187.108 – 10.2.187.10910.2.187.109
2410.2.187.110/3110.2.187.110 – 10.2.187.11110.2.187.111
2510.2.187.112/3110.2.187.112 – 10.2.187.11310.2.187.113
2610.2.187.114/3110.2.187.114 – 10.2.187.11510.2.187.115
2710.2.187.116/3110.2.187.116 – 10.2.187.11710.2.187.117
2810.2.187.118/3110.2.187.118 – 10.2.187.11910.2.187.119
2910.2.187.120/3110.2.187.120 – 10.2.187.12110.2.187.121
3010.2.187.122/3110.2.187.122 – 10.2.187.12310.2.187.123
3110.2.187.124/3110.2.187.124 – 10.2.187.12510.2.187.125
3210.2.187.126/3110.2.187.126 – 10.2.187.12710.2.187.127
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 →