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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)10.2.91.64/26
network10.2.91.64/26
broadcast10.2.91.127
first host10.2.91.65
last host10.2.91.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.91.64/26
address00001010.00000010.01011011.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.01011011.01000000
broadcast00001010.00000010.01011011.01111111
green = network part, grey = host part
hex0x0a025b40
decimal167926592
reverse dns64.91.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:5b40

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.91.64/3210.2.91.64 – 10.2.91.6410.2.91.64
210.2.91.65/3210.2.91.65 – 10.2.91.6510.2.91.65
310.2.91.66/3210.2.91.66 – 10.2.91.6610.2.91.66
410.2.91.67/3210.2.91.67 – 10.2.91.6710.2.91.67
510.2.91.68/3210.2.91.68 – 10.2.91.6810.2.91.68
610.2.91.69/3210.2.91.69 – 10.2.91.6910.2.91.69
710.2.91.70/3210.2.91.70 – 10.2.91.7010.2.91.70
810.2.91.71/3210.2.91.71 – 10.2.91.7110.2.91.71
910.2.91.72/3210.2.91.72 – 10.2.91.7210.2.91.72
1010.2.91.73/3210.2.91.73 – 10.2.91.7310.2.91.73
1110.2.91.74/3210.2.91.74 – 10.2.91.7410.2.91.74
1210.2.91.75/3210.2.91.75 – 10.2.91.7510.2.91.75
1310.2.91.76/3210.2.91.76 – 10.2.91.7610.2.91.76
1410.2.91.77/3210.2.91.77 – 10.2.91.7710.2.91.77
1510.2.91.78/3210.2.91.78 – 10.2.91.7810.2.91.78
1610.2.91.79/3210.2.91.79 – 10.2.91.7910.2.91.79
1710.2.91.80/3210.2.91.80 – 10.2.91.8010.2.91.80
1810.2.91.81/3210.2.91.81 – 10.2.91.8110.2.91.81
1910.2.91.82/3210.2.91.82 – 10.2.91.8210.2.91.82
2010.2.91.83/3210.2.91.83 – 10.2.91.8310.2.91.83
2110.2.91.84/3210.2.91.84 – 10.2.91.8410.2.91.84
2210.2.91.85/3210.2.91.85 – 10.2.91.8510.2.91.85
2310.2.91.86/3210.2.91.86 – 10.2.91.8610.2.91.86
2410.2.91.87/3210.2.91.87 – 10.2.91.8710.2.91.87
2510.2.91.88/3210.2.91.88 – 10.2.91.8810.2.91.88
2610.2.91.89/3210.2.91.89 – 10.2.91.8910.2.91.89
2710.2.91.90/3210.2.91.90 – 10.2.91.9010.2.91.90
2810.2.91.91/3210.2.91.91 – 10.2.91.9110.2.91.91
2910.2.91.92/3210.2.91.92 – 10.2.91.9210.2.91.92
3010.2.91.93/3210.2.91.93 – 10.2.91.9310.2.91.93
3110.2.91.94/3210.2.91.94 – 10.2.91.9410.2.91.94
3210.2.91.95/3210.2.91.95 – 10.2.91.9510.2.91.95
3310.2.91.96/3210.2.91.96 – 10.2.91.9610.2.91.96
3410.2.91.97/3210.2.91.97 – 10.2.91.9710.2.91.97
3510.2.91.98/3210.2.91.98 – 10.2.91.9810.2.91.98
3610.2.91.99/3210.2.91.99 – 10.2.91.9910.2.91.99
3710.2.91.100/3210.2.91.100 – 10.2.91.10010.2.91.100
3810.2.91.101/3210.2.91.101 – 10.2.91.10110.2.91.101
3910.2.91.102/3210.2.91.102 – 10.2.91.10210.2.91.102
4010.2.91.103/3210.2.91.103 – 10.2.91.10310.2.91.103
4110.2.91.104/3210.2.91.104 – 10.2.91.10410.2.91.104
4210.2.91.105/3210.2.91.105 – 10.2.91.10510.2.91.105
4310.2.91.106/3210.2.91.106 – 10.2.91.10610.2.91.106
4410.2.91.107/3210.2.91.107 – 10.2.91.10710.2.91.107
4510.2.91.108/3210.2.91.108 – 10.2.91.10810.2.91.108
4610.2.91.109/3210.2.91.109 – 10.2.91.10910.2.91.109
4710.2.91.110/3210.2.91.110 – 10.2.91.11010.2.91.110
4810.2.91.111/3210.2.91.111 – 10.2.91.11110.2.91.111
4910.2.91.112/3210.2.91.112 – 10.2.91.11210.2.91.112
5010.2.91.113/3210.2.91.113 – 10.2.91.11310.2.91.113
5110.2.91.114/3210.2.91.114 – 10.2.91.11410.2.91.114
5210.2.91.115/3210.2.91.115 – 10.2.91.11510.2.91.115
5310.2.91.116/3210.2.91.116 – 10.2.91.11610.2.91.116
5410.2.91.117/3210.2.91.117 – 10.2.91.11710.2.91.117
5510.2.91.118/3210.2.91.118 – 10.2.91.11810.2.91.118
5610.2.91.119/3210.2.91.119 – 10.2.91.11910.2.91.119
5710.2.91.120/3210.2.91.120 – 10.2.91.12010.2.91.120
5810.2.91.121/3210.2.91.121 – 10.2.91.12110.2.91.121
5910.2.91.122/3210.2.91.122 – 10.2.91.12210.2.91.122
6010.2.91.123/3210.2.91.123 – 10.2.91.12310.2.91.123
6110.2.91.124/3210.2.91.124 – 10.2.91.12410.2.91.124
6210.2.91.125/3210.2.91.125 – 10.2.91.12510.2.91.125
6310.2.91.126/3210.2.91.126 – 10.2.91.12610.2.91.126
6410.2.91.127/3210.2.91.127 – 10.2.91.12710.2.91.127
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 →