Network addressing

unique identifier assigned to network interfaces for communications on the physical network segment

unique sequence of digits assigned to a telephone subscription

email authentication method designed to detect email spoofing

thumb|right|240px|An incorrectly entered URL could lead to a website operated by a cybersquatter. Typosquatting, also called URL hijacking, a sting site, a cousin domain, or a fake URL, is a form of cybersquatting, and possibly brandjacking which relies on mistakes such as typos made by Internet users when inputting a website address into a web browser. A user accidentally entering an incorrect website address may be led to any URL, including an alternative website owned by a cybersquatter.

simple email-validation system designed to detect email spoofing

identifier for a node or network interface of a telecommunications network

computer network address that is only usable on the same local network

metric of website visitation

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Means of addressing all devices on a network with a single transmission

E.123 is an international standard by the Telecommunication Standardization Sector of the International Telecommunication Union (ITU-T), entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. It provides guidelines for the presentation of telephone numbers, email addresses, and web addresses in print, on letterheads, and similar purposes.

24-bit number in networking equipment that uniquely identifies its seller/producer

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presentation format for numerical data, consists of a string of decimal numbers, each pair separated by a full stop (dot)