Address Formats

Mac Adresses - Media Access Control

• OSI Layer 2 Addesses
• Physical address of the network adapter card
• MAC addresses have 12 hexadecimal characters so it's 12x4(bits) which is 48(bits). Divide that by 8(bits) which leaves you with 6(bytes).

Six bytes, usually represented in hexadecimal

• First three bytes are assigned by the IEEE to the manufacturer
• OUI - Organizationally Unique Identifer
• Last three bytes are usually assigned sequentially
• Duplicates are rare

Internet Protocol V 4

• OSI Layer 3 Address
• Since One byte is 8bits, the maximum decimal value for each byte is 255

Internet Protocol V6
OSI Layer 3 Address

• Groups of zeros can be abbereviated with a double colon ::
• Only one abbreviation allowed per address
• Leading zeros are optional
• Your DNS will become very important for the long ipv6 address