CODEWITHSUNDEEP
javamac-address
JavaUser
JavaUser

Reputation: 26324

Find out given mac address is in range or not

I want to know whether a given mac address is in range of specified mac addresses.

For example , i defined begin and end address . If you provide any mac address with in this range then the API has to return true otherwise false.

Eg : 70-71-BC-90-0D-01 is in range and 70-71-BC-90-0D-FF is not in range.

Begin address:  70-71-BC-90-00-00
End address :   70-71-BC-90-0D-F7

Thanks

Upvotes: 3

Views: 1101

Answers (2)

Bohemian
Bohemian

Reputation: 424983

Since 0-9 chars are "less than" A-Z chars, and all inputs are the same length, just use String comparison:

String beginAddress = "70-71-BC-90-00-00";
String endAddress = "70-71-BC-90-0D-F7";

if (macAddress.compareToIgnoreCase(beginAddress) >= 0
   && macAddress.compareToIgnoreCase(endAddress) <= 0)
    // in range

Upvotes: 5

icza
icza

Reputation: 417512

To be completely universal with the ranges (and not just answer to this specific range), you can create BigInteger instances, and compare them.

To create BigIntegers, we'll look at the MAC addresses as the hexadecimal representations of the numbers.

The following implementation doesn't care about:

  • the "case" of hexadecimal digits (works with lower-cased, upper-cased, mixed)
  • whether there are dash '-' separator characters in MAC addresses

The Java code:

BigInteger min = new BigInteger(minAddr.replace("-",""), 16);
BigInteger max = new BigInteger(maxAddr.replace("-",""), 16);

BigInteger test = new BigInteger(testAddr.replace("-",""), 16);

boolean isInRange = min.compareTo(test) <= 0 && max.compareTo(test) >= 0;

If you need to check many MAC addresses, you can obviously cache the min and max BigIntegers.

Upvotes: 5

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