IP addresses on the other hand are now 4 bytes (until IPv6 happens) and almost always expressed in Decimal format as a number 0 - 255. Sometimes the letters are upper case, sometimes lower case, but never mixed. They are invariably expressed in hexdecimal notation (base 16, uses the characters 0-9 + A-F - each byte uses 2 characters since 16 * 16 is 256). ![]() A mac address is always 6 bytes long, how they are seperated varies, but is usually colons.
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