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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)10.0.85.64/26
network10.0.85.64/26
broadcast10.0.85.127
first host10.0.85.65
last host10.0.85.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.0.85.64/26
address00001010.00000000.01010101.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000000.01010101.01000000
broadcast00001010.00000000.01010101.01111111
green = network part, grey = host part
hex0x0a005540
decimal167793984
reverse dns64.85.0.10.in-addr.arpa
ipv4-mapped::ffff:a00:5540

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.0.85.64/3210.0.85.64 – 10.0.85.6410.0.85.64
210.0.85.65/3210.0.85.65 – 10.0.85.6510.0.85.65
310.0.85.66/3210.0.85.66 – 10.0.85.6610.0.85.66
410.0.85.67/3210.0.85.67 – 10.0.85.6710.0.85.67
510.0.85.68/3210.0.85.68 – 10.0.85.6810.0.85.68
610.0.85.69/3210.0.85.69 – 10.0.85.6910.0.85.69
710.0.85.70/3210.0.85.70 – 10.0.85.7010.0.85.70
810.0.85.71/3210.0.85.71 – 10.0.85.7110.0.85.71
910.0.85.72/3210.0.85.72 – 10.0.85.7210.0.85.72
1010.0.85.73/3210.0.85.73 – 10.0.85.7310.0.85.73
1110.0.85.74/3210.0.85.74 – 10.0.85.7410.0.85.74
1210.0.85.75/3210.0.85.75 – 10.0.85.7510.0.85.75
1310.0.85.76/3210.0.85.76 – 10.0.85.7610.0.85.76
1410.0.85.77/3210.0.85.77 – 10.0.85.7710.0.85.77
1510.0.85.78/3210.0.85.78 – 10.0.85.7810.0.85.78
1610.0.85.79/3210.0.85.79 – 10.0.85.7910.0.85.79
1710.0.85.80/3210.0.85.80 – 10.0.85.8010.0.85.80
1810.0.85.81/3210.0.85.81 – 10.0.85.8110.0.85.81
1910.0.85.82/3210.0.85.82 – 10.0.85.8210.0.85.82
2010.0.85.83/3210.0.85.83 – 10.0.85.8310.0.85.83
2110.0.85.84/3210.0.85.84 – 10.0.85.8410.0.85.84
2210.0.85.85/3210.0.85.85 – 10.0.85.8510.0.85.85
2310.0.85.86/3210.0.85.86 – 10.0.85.8610.0.85.86
2410.0.85.87/3210.0.85.87 – 10.0.85.8710.0.85.87
2510.0.85.88/3210.0.85.88 – 10.0.85.8810.0.85.88
2610.0.85.89/3210.0.85.89 – 10.0.85.8910.0.85.89
2710.0.85.90/3210.0.85.90 – 10.0.85.9010.0.85.90
2810.0.85.91/3210.0.85.91 – 10.0.85.9110.0.85.91
2910.0.85.92/3210.0.85.92 – 10.0.85.9210.0.85.92
3010.0.85.93/3210.0.85.93 – 10.0.85.9310.0.85.93
3110.0.85.94/3210.0.85.94 – 10.0.85.9410.0.85.94
3210.0.85.95/3210.0.85.95 – 10.0.85.9510.0.85.95
3310.0.85.96/3210.0.85.96 – 10.0.85.9610.0.85.96
3410.0.85.97/3210.0.85.97 – 10.0.85.9710.0.85.97
3510.0.85.98/3210.0.85.98 – 10.0.85.9810.0.85.98
3610.0.85.99/3210.0.85.99 – 10.0.85.9910.0.85.99
3710.0.85.100/3210.0.85.100 – 10.0.85.10010.0.85.100
3810.0.85.101/3210.0.85.101 – 10.0.85.10110.0.85.101
3910.0.85.102/3210.0.85.102 – 10.0.85.10210.0.85.102
4010.0.85.103/3210.0.85.103 – 10.0.85.10310.0.85.103
4110.0.85.104/3210.0.85.104 – 10.0.85.10410.0.85.104
4210.0.85.105/3210.0.85.105 – 10.0.85.10510.0.85.105
4310.0.85.106/3210.0.85.106 – 10.0.85.10610.0.85.106
4410.0.85.107/3210.0.85.107 – 10.0.85.10710.0.85.107
4510.0.85.108/3210.0.85.108 – 10.0.85.10810.0.85.108
4610.0.85.109/3210.0.85.109 – 10.0.85.10910.0.85.109
4710.0.85.110/3210.0.85.110 – 10.0.85.11010.0.85.110
4810.0.85.111/3210.0.85.111 – 10.0.85.11110.0.85.111
4910.0.85.112/3210.0.85.112 – 10.0.85.11210.0.85.112
5010.0.85.113/3210.0.85.113 – 10.0.85.11310.0.85.113
5110.0.85.114/3210.0.85.114 – 10.0.85.11410.0.85.114
5210.0.85.115/3210.0.85.115 – 10.0.85.11510.0.85.115
5310.0.85.116/3210.0.85.116 – 10.0.85.11610.0.85.116
5410.0.85.117/3210.0.85.117 – 10.0.85.11710.0.85.117
5510.0.85.118/3210.0.85.118 – 10.0.85.11810.0.85.118
5610.0.85.119/3210.0.85.119 – 10.0.85.11910.0.85.119
5710.0.85.120/3210.0.85.120 – 10.0.85.12010.0.85.120
5810.0.85.121/3210.0.85.121 – 10.0.85.12110.0.85.121
5910.0.85.122/3210.0.85.122 – 10.0.85.12210.0.85.122
6010.0.85.123/3210.0.85.123 – 10.0.85.12310.0.85.123
6110.0.85.124/3210.0.85.124 – 10.0.85.12410.0.85.124
6210.0.85.125/3210.0.85.125 – 10.0.85.12510.0.85.125
6310.0.85.126/3210.0.85.126 – 10.0.85.12610.0.85.126
6410.0.85.127/3210.0.85.127 – 10.0.85.12710.0.85.127
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 →