Unicast Address

What Does Unicast Address Mean?

A unicast address is an address that identifies a unique node on a network. Unicast addressing is available in IPv4 and IPv6 and typically refers to a single sender or a single receiver, although it can be used in both sending and receiving.


A unicast address packet is transferred to a network node, which includes an interface address. The unicast address is then inserted into the destination’s packet header, which is sent to the network device destination.

Unicast is the most common form of IP addressing.

Techopedia Explains Unicast Address

A unicast address identifies a network device, such as a workstation or a server. A unicast address on a local area network (LAN) contains a subnet prefix and an interface ID.

A unicast address is used in the following instances:

  • Unspecified Interface Address: A unicast address with a value of 0:0:0:0:0:0:0:0 is used in the absence of an unspecified interface address.
  • Loopback Address: A unicast address with a value of 0:0:0:0:0:0:0:1 is used to specify a loopback address used to redirect the packets to their source.

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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…