Máy tính CIDR

Cách sử dụng công cụ này

1. 1

   Type the number of hosts you need to address into the 'Hosts needed' field.

2. 2

   Read the 'Smallest CIDR fitting' row to get the prefix length (for example /26).

3. 3

   Check the 'Total addresses' and 'Usable hosts' rows to confirm the block is big enough.

4. 4

   Look at the 'Address space wasted' row to see how many addresses you would leave unused at that prefix.

Máy tính CIDR là gì?

Các trường hợp sử dụng phổ biến

• Sizing a new office VLAN by entering the expected device count and picking the prefix that leaves a little headroom.

• Quickly checking whether a /24 is overkill for a subnet that only needs 30 hosts.

• Comparing the wasted-address count across host estimates before you carve up a parent block.

• Teaching subnetting students why 50 hosts needs 64 addresses and not 50.

• Planning IP allocation for a fleet of IoT devices and confirming the block will not run out as you scale.

• Sanity-checking a colleague's subnet proposal by reproducing the host-to-prefix math in seconds.

Câu hỏi thường gặp