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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)10.65.166.64/26
network10.65.166.64/26
broadcast10.65.166.127
first host10.65.166.65
last host10.65.166.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.65.166.64/26
address00001010.01000001.10100110.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.01000001.10100110.01000000
broadcast00001010.01000001.10100110.01111111
green = network part, grey = host part
hex0x0a41a640
decimal172074560
reverse dns64.166.65.10.in-addr.arpa
ipv4-mapped::ffff:a41:a640

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.65.166.64/3210.65.166.64 – 10.65.166.6410.65.166.64
210.65.166.65/3210.65.166.65 – 10.65.166.6510.65.166.65
310.65.166.66/3210.65.166.66 – 10.65.166.6610.65.166.66
410.65.166.67/3210.65.166.67 – 10.65.166.6710.65.166.67
510.65.166.68/3210.65.166.68 – 10.65.166.6810.65.166.68
610.65.166.69/3210.65.166.69 – 10.65.166.6910.65.166.69
710.65.166.70/3210.65.166.70 – 10.65.166.7010.65.166.70
810.65.166.71/3210.65.166.71 – 10.65.166.7110.65.166.71
910.65.166.72/3210.65.166.72 – 10.65.166.7210.65.166.72
1010.65.166.73/3210.65.166.73 – 10.65.166.7310.65.166.73
1110.65.166.74/3210.65.166.74 – 10.65.166.7410.65.166.74
1210.65.166.75/3210.65.166.75 – 10.65.166.7510.65.166.75
1310.65.166.76/3210.65.166.76 – 10.65.166.7610.65.166.76
1410.65.166.77/3210.65.166.77 – 10.65.166.7710.65.166.77
1510.65.166.78/3210.65.166.78 – 10.65.166.7810.65.166.78
1610.65.166.79/3210.65.166.79 – 10.65.166.7910.65.166.79
1710.65.166.80/3210.65.166.80 – 10.65.166.8010.65.166.80
1810.65.166.81/3210.65.166.81 – 10.65.166.8110.65.166.81
1910.65.166.82/3210.65.166.82 – 10.65.166.8210.65.166.82
2010.65.166.83/3210.65.166.83 – 10.65.166.8310.65.166.83
2110.65.166.84/3210.65.166.84 – 10.65.166.8410.65.166.84
2210.65.166.85/3210.65.166.85 – 10.65.166.8510.65.166.85
2310.65.166.86/3210.65.166.86 – 10.65.166.8610.65.166.86
2410.65.166.87/3210.65.166.87 – 10.65.166.8710.65.166.87
2510.65.166.88/3210.65.166.88 – 10.65.166.8810.65.166.88
2610.65.166.89/3210.65.166.89 – 10.65.166.8910.65.166.89
2710.65.166.90/3210.65.166.90 – 10.65.166.9010.65.166.90
2810.65.166.91/3210.65.166.91 – 10.65.166.9110.65.166.91
2910.65.166.92/3210.65.166.92 – 10.65.166.9210.65.166.92
3010.65.166.93/3210.65.166.93 – 10.65.166.9310.65.166.93
3110.65.166.94/3210.65.166.94 – 10.65.166.9410.65.166.94
3210.65.166.95/3210.65.166.95 – 10.65.166.9510.65.166.95
3310.65.166.96/3210.65.166.96 – 10.65.166.9610.65.166.96
3410.65.166.97/3210.65.166.97 – 10.65.166.9710.65.166.97
3510.65.166.98/3210.65.166.98 – 10.65.166.9810.65.166.98
3610.65.166.99/3210.65.166.99 – 10.65.166.9910.65.166.99
3710.65.166.100/3210.65.166.100 – 10.65.166.10010.65.166.100
3810.65.166.101/3210.65.166.101 – 10.65.166.10110.65.166.101
3910.65.166.102/3210.65.166.102 – 10.65.166.10210.65.166.102
4010.65.166.103/3210.65.166.103 – 10.65.166.10310.65.166.103
4110.65.166.104/3210.65.166.104 – 10.65.166.10410.65.166.104
4210.65.166.105/3210.65.166.105 – 10.65.166.10510.65.166.105
4310.65.166.106/3210.65.166.106 – 10.65.166.10610.65.166.106
4410.65.166.107/3210.65.166.107 – 10.65.166.10710.65.166.107
4510.65.166.108/3210.65.166.108 – 10.65.166.10810.65.166.108
4610.65.166.109/3210.65.166.109 – 10.65.166.10910.65.166.109
4710.65.166.110/3210.65.166.110 – 10.65.166.11010.65.166.110
4810.65.166.111/3210.65.166.111 – 10.65.166.11110.65.166.111
4910.65.166.112/3210.65.166.112 – 10.65.166.11210.65.166.112
5010.65.166.113/3210.65.166.113 – 10.65.166.11310.65.166.113
5110.65.166.114/3210.65.166.114 – 10.65.166.11410.65.166.114
5210.65.166.115/3210.65.166.115 – 10.65.166.11510.65.166.115
5310.65.166.116/3210.65.166.116 – 10.65.166.11610.65.166.116
5410.65.166.117/3210.65.166.117 – 10.65.166.11710.65.166.117
5510.65.166.118/3210.65.166.118 – 10.65.166.11810.65.166.118
5610.65.166.119/3210.65.166.119 – 10.65.166.11910.65.166.119
5710.65.166.120/3210.65.166.120 – 10.65.166.12010.65.166.120
5810.65.166.121/3210.65.166.121 – 10.65.166.12110.65.166.121
5910.65.166.122/3210.65.166.122 – 10.65.166.12210.65.166.122
6010.65.166.123/3210.65.166.123 – 10.65.166.12310.65.166.123
6110.65.166.124/3210.65.166.124 – 10.65.166.12410.65.166.124
6210.65.166.125/3210.65.166.125 – 10.65.166.12510.65.166.125
6310.65.166.126/3210.65.166.126 – 10.65.166.12610.65.166.126
6410.65.166.127/3210.65.166.127 – 10.65.166.12710.65.166.127
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 →