There may be instances when the Dominican Information Technology Department will need to know your computer’s ‘MAC Address’. This unique network identifier is in the format 01:23:45:67:89:AB (or 01-23-45-67-89-AB) - it has 6 pairs of letters/numbers for a total of 12 letters and numbers. Here are the instructions on how to find your computer’s MAC address depending on the type of computer you have.