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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)10.2.18.64/26
network10.2.18.64/26
broadcast10.2.18.127
first host10.2.18.65
last host10.2.18.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.2.18.64/26
address00001010.00000010.00010010.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00000010.00010010.01000000
broadcast00001010.00000010.00010010.01111111
green = network part, grey = host part
hex0x0a021240
decimal167907904
reverse dns64.18.2.10.in-addr.arpa
ipv4-mapped::ffff:a02:1240

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.2.18.64/3210.2.18.64 – 10.2.18.6410.2.18.64
210.2.18.65/3210.2.18.65 – 10.2.18.6510.2.18.65
310.2.18.66/3210.2.18.66 – 10.2.18.6610.2.18.66
410.2.18.67/3210.2.18.67 – 10.2.18.6710.2.18.67
510.2.18.68/3210.2.18.68 – 10.2.18.6810.2.18.68
610.2.18.69/3210.2.18.69 – 10.2.18.6910.2.18.69
710.2.18.70/3210.2.18.70 – 10.2.18.7010.2.18.70
810.2.18.71/3210.2.18.71 – 10.2.18.7110.2.18.71
910.2.18.72/3210.2.18.72 – 10.2.18.7210.2.18.72
1010.2.18.73/3210.2.18.73 – 10.2.18.7310.2.18.73
1110.2.18.74/3210.2.18.74 – 10.2.18.7410.2.18.74
1210.2.18.75/3210.2.18.75 – 10.2.18.7510.2.18.75
1310.2.18.76/3210.2.18.76 – 10.2.18.7610.2.18.76
1410.2.18.77/3210.2.18.77 – 10.2.18.7710.2.18.77
1510.2.18.78/3210.2.18.78 – 10.2.18.7810.2.18.78
1610.2.18.79/3210.2.18.79 – 10.2.18.7910.2.18.79
1710.2.18.80/3210.2.18.80 – 10.2.18.8010.2.18.80
1810.2.18.81/3210.2.18.81 – 10.2.18.8110.2.18.81
1910.2.18.82/3210.2.18.82 – 10.2.18.8210.2.18.82
2010.2.18.83/3210.2.18.83 – 10.2.18.8310.2.18.83
2110.2.18.84/3210.2.18.84 – 10.2.18.8410.2.18.84
2210.2.18.85/3210.2.18.85 – 10.2.18.8510.2.18.85
2310.2.18.86/3210.2.18.86 – 10.2.18.8610.2.18.86
2410.2.18.87/3210.2.18.87 – 10.2.18.8710.2.18.87
2510.2.18.88/3210.2.18.88 – 10.2.18.8810.2.18.88
2610.2.18.89/3210.2.18.89 – 10.2.18.8910.2.18.89
2710.2.18.90/3210.2.18.90 – 10.2.18.9010.2.18.90
2810.2.18.91/3210.2.18.91 – 10.2.18.9110.2.18.91
2910.2.18.92/3210.2.18.92 – 10.2.18.9210.2.18.92
3010.2.18.93/3210.2.18.93 – 10.2.18.9310.2.18.93
3110.2.18.94/3210.2.18.94 – 10.2.18.9410.2.18.94
3210.2.18.95/3210.2.18.95 – 10.2.18.9510.2.18.95
3310.2.18.96/3210.2.18.96 – 10.2.18.9610.2.18.96
3410.2.18.97/3210.2.18.97 – 10.2.18.9710.2.18.97
3510.2.18.98/3210.2.18.98 – 10.2.18.9810.2.18.98
3610.2.18.99/3210.2.18.99 – 10.2.18.9910.2.18.99
3710.2.18.100/3210.2.18.100 – 10.2.18.10010.2.18.100
3810.2.18.101/3210.2.18.101 – 10.2.18.10110.2.18.101
3910.2.18.102/3210.2.18.102 – 10.2.18.10210.2.18.102
4010.2.18.103/3210.2.18.103 – 10.2.18.10310.2.18.103
4110.2.18.104/3210.2.18.104 – 10.2.18.10410.2.18.104
4210.2.18.105/3210.2.18.105 – 10.2.18.10510.2.18.105
4310.2.18.106/3210.2.18.106 – 10.2.18.10610.2.18.106
4410.2.18.107/3210.2.18.107 – 10.2.18.10710.2.18.107
4510.2.18.108/3210.2.18.108 – 10.2.18.10810.2.18.108
4610.2.18.109/3210.2.18.109 – 10.2.18.10910.2.18.109
4710.2.18.110/3210.2.18.110 – 10.2.18.11010.2.18.110
4810.2.18.111/3210.2.18.111 – 10.2.18.11110.2.18.111
4910.2.18.112/3210.2.18.112 – 10.2.18.11210.2.18.112
5010.2.18.113/3210.2.18.113 – 10.2.18.11310.2.18.113
5110.2.18.114/3210.2.18.114 – 10.2.18.11410.2.18.114
5210.2.18.115/3210.2.18.115 – 10.2.18.11510.2.18.115
5310.2.18.116/3210.2.18.116 – 10.2.18.11610.2.18.116
5410.2.18.117/3210.2.18.117 – 10.2.18.11710.2.18.117
5510.2.18.118/3210.2.18.118 – 10.2.18.11810.2.18.118
5610.2.18.119/3210.2.18.119 – 10.2.18.11910.2.18.119
5710.2.18.120/3210.2.18.120 – 10.2.18.12010.2.18.120
5810.2.18.121/3210.2.18.121 – 10.2.18.12110.2.18.121
5910.2.18.122/3210.2.18.122 – 10.2.18.12210.2.18.122
6010.2.18.123/3210.2.18.123 – 10.2.18.12310.2.18.123
6110.2.18.124/3210.2.18.124 – 10.2.18.12410.2.18.124
6210.2.18.125/3210.2.18.125 – 10.2.18.12510.2.18.125
6310.2.18.126/3210.2.18.126 – 10.2.18.12610.2.18.126
6410.2.18.127/3210.2.18.127 – 10.2.18.12710.2.18.127
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 →