Validate Your MAC Address Online Validate MAC addresses in multiple formats with OUI prefix identification.

Under the hood, the tool uses regular expressions to normalize the input MAC address by removing common separators such as colons, dashes, dots, and whitespace characters. It then checks if the cleaned string consists only of hexadecimal digits using the test method of the RegExp object with the pattern /^[0-9A-F]+$/. If the input is invalid, it returns an object with a valid property set to false and an array of details explaining the error.

The tool uses JavaScript's built-in parseInt function to convert the first byte of the MAC address from a hexadecimal string to an integer, which is then used to determine if the address is unicast or multicast by checking the least significant bit. It also checks the second least significant bit to determine if the address is universally or locally administered. The OUI manufacturer prefix is extracted by taking the first six characters of the cleaned MAC address and formatting them with colons using the join method of the Array object.

The React library is used to build the user interface, with components such as input fields, buttons, and div elements. The useState hook is used to store the input MAC address and the result of the validation in the component's state, while the useCallback hook is used to memoize the handleValidate function to prevent unnecessary re-renders. When the user clicks the Validate button or presses the Enter key, the handleValidate function calls the validateMac function with the current input MAC address and updates the component's state with the result.

The validateMac function uses an object with two properties: valid and details. The valid property is a boolean indicating whether the MAC address is valid, and the details property is an array of strings providing more information about the validated address. If the MAC address is valid, the details array contains strings with checkmarks indicating that the address has a valid length, format, and type, as well as its OUI manufacturer prefix and notation in different formats. The tool also checks for the broadcast address FFFFFFFFFFFF and indicates if it is the case.