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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)10.63.40.64/26
network10.63.40.64/26
broadcast10.63.40.127
first host10.63.40.65
last host10.63.40.126
subnet mask255.255.255.192
wildcard0.0.0.63
addresses64
usable hosts62
classA
ipcalc 10.63.40.64/26
address00001010.00111111.00101000.01000000
subnet mask11111111.11111111.11111111.11000000
network00001010.00111111.00101000.01000000
broadcast00001010.00111111.00101000.01111111
green = network part, grey = host part
hex0x0a3f2840
decimal171911232
reverse dns64.40.63.10.in-addr.arpa
ipv4-mapped::ffff:a3f:2840

/26 split into /32 · 64 subnets

close ×
#networkhost rangebroadcast
110.63.40.64/3210.63.40.64 – 10.63.40.6410.63.40.64
210.63.40.65/3210.63.40.65 – 10.63.40.6510.63.40.65
310.63.40.66/3210.63.40.66 – 10.63.40.6610.63.40.66
410.63.40.67/3210.63.40.67 – 10.63.40.6710.63.40.67
510.63.40.68/3210.63.40.68 – 10.63.40.6810.63.40.68
610.63.40.69/3210.63.40.69 – 10.63.40.6910.63.40.69
710.63.40.70/3210.63.40.70 – 10.63.40.7010.63.40.70
810.63.40.71/3210.63.40.71 – 10.63.40.7110.63.40.71
910.63.40.72/3210.63.40.72 – 10.63.40.7210.63.40.72
1010.63.40.73/3210.63.40.73 – 10.63.40.7310.63.40.73
1110.63.40.74/3210.63.40.74 – 10.63.40.7410.63.40.74
1210.63.40.75/3210.63.40.75 – 10.63.40.7510.63.40.75
1310.63.40.76/3210.63.40.76 – 10.63.40.7610.63.40.76
1410.63.40.77/3210.63.40.77 – 10.63.40.7710.63.40.77
1510.63.40.78/3210.63.40.78 – 10.63.40.7810.63.40.78
1610.63.40.79/3210.63.40.79 – 10.63.40.7910.63.40.79
1710.63.40.80/3210.63.40.80 – 10.63.40.8010.63.40.80
1810.63.40.81/3210.63.40.81 – 10.63.40.8110.63.40.81
1910.63.40.82/3210.63.40.82 – 10.63.40.8210.63.40.82
2010.63.40.83/3210.63.40.83 – 10.63.40.8310.63.40.83
2110.63.40.84/3210.63.40.84 – 10.63.40.8410.63.40.84
2210.63.40.85/3210.63.40.85 – 10.63.40.8510.63.40.85
2310.63.40.86/3210.63.40.86 – 10.63.40.8610.63.40.86
2410.63.40.87/3210.63.40.87 – 10.63.40.8710.63.40.87
2510.63.40.88/3210.63.40.88 – 10.63.40.8810.63.40.88
2610.63.40.89/3210.63.40.89 – 10.63.40.8910.63.40.89
2710.63.40.90/3210.63.40.90 – 10.63.40.9010.63.40.90
2810.63.40.91/3210.63.40.91 – 10.63.40.9110.63.40.91
2910.63.40.92/3210.63.40.92 – 10.63.40.9210.63.40.92
3010.63.40.93/3210.63.40.93 – 10.63.40.9310.63.40.93
3110.63.40.94/3210.63.40.94 – 10.63.40.9410.63.40.94
3210.63.40.95/3210.63.40.95 – 10.63.40.9510.63.40.95
3310.63.40.96/3210.63.40.96 – 10.63.40.9610.63.40.96
3410.63.40.97/3210.63.40.97 – 10.63.40.9710.63.40.97
3510.63.40.98/3210.63.40.98 – 10.63.40.9810.63.40.98
3610.63.40.99/3210.63.40.99 – 10.63.40.9910.63.40.99
3710.63.40.100/3210.63.40.100 – 10.63.40.10010.63.40.100
3810.63.40.101/3210.63.40.101 – 10.63.40.10110.63.40.101
3910.63.40.102/3210.63.40.102 – 10.63.40.10210.63.40.102
4010.63.40.103/3210.63.40.103 – 10.63.40.10310.63.40.103
4110.63.40.104/3210.63.40.104 – 10.63.40.10410.63.40.104
4210.63.40.105/3210.63.40.105 – 10.63.40.10510.63.40.105
4310.63.40.106/3210.63.40.106 – 10.63.40.10610.63.40.106
4410.63.40.107/3210.63.40.107 – 10.63.40.10710.63.40.107
4510.63.40.108/3210.63.40.108 – 10.63.40.10810.63.40.108
4610.63.40.109/3210.63.40.109 – 10.63.40.10910.63.40.109
4710.63.40.110/3210.63.40.110 – 10.63.40.11010.63.40.110
4810.63.40.111/3210.63.40.111 – 10.63.40.11110.63.40.111
4910.63.40.112/3210.63.40.112 – 10.63.40.11210.63.40.112
5010.63.40.113/3210.63.40.113 – 10.63.40.11310.63.40.113
5110.63.40.114/3210.63.40.114 – 10.63.40.11410.63.40.114
5210.63.40.115/3210.63.40.115 – 10.63.40.11510.63.40.115
5310.63.40.116/3210.63.40.116 – 10.63.40.11610.63.40.116
5410.63.40.117/3210.63.40.117 – 10.63.40.11710.63.40.117
5510.63.40.118/3210.63.40.118 – 10.63.40.11810.63.40.118
5610.63.40.119/3210.63.40.119 – 10.63.40.11910.63.40.119
5710.63.40.120/3210.63.40.120 – 10.63.40.12010.63.40.120
5810.63.40.121/3210.63.40.121 – 10.63.40.12110.63.40.121
5910.63.40.122/3210.63.40.122 – 10.63.40.12210.63.40.122
6010.63.40.123/3210.63.40.123 – 10.63.40.12310.63.40.123
6110.63.40.124/3210.63.40.124 – 10.63.40.12410.63.40.124
6210.63.40.125/3210.63.40.125 – 10.63.40.12510.63.40.125
6310.63.40.126/3210.63.40.126 – 10.63.40.12610.63.40.126
6410.63.40.127/3210.63.40.127 – 10.63.40.12710.63.40.127
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 →