In an effort clarify some of the “nerdy” terms our tech crew often uses, we’ve identified some common internet terms and defined them below.
A unique name that identifies an Internet site. Each Domain Name points to only one machine. Domain Names always have multiple parts, separated by dots. The left part is the most specific while the right part is the least specific. For example:
IP Number (Internet Protocol Number)
Often refered to as IP Address, a unique number consisting of 4 parts separated by dots. For example:
Every machine that is on the Internet has a unique IP Numbers. Machines often have one or more Domain Names that translate to an IP Number, which makes them easier to identify.
URL (Uniform Resource Locator)
Synonymous with URI. In fact, URI has replaced URL in technical specifications.
URI (Uniform Resource Identifier)
An address for a resource available on the Internet.
The first part of a URI is called the “scheme”. The most commonly known scheme is http. Each URI scheme has its own format for how a URI should appear.
A number that is part of a URL which appears after a colon (:) to the right of the domain name. All services on an Internet server listens on a specific port number defined on that server. Most services have standard port numbers. Web servers primarily listen on port 80. Services can also listen on non-standard ports, therefore the port number must be specified in a URL when accessing the server. For example:
This URL will attempt to make a connection to the FTP service on example.com on a specific port (25252). This connection will only be made if port 25252 is defined on that server for FTP services.
ISP (Internet Service Provider)
Any organization that provides access to the Internet.
DNS (Domain Name System)
Translates Domain Names into IP Numbers.
A DNS server runs networking software and maintains records of Domain Names and IP Numbers for other Internet hosts.
DNS records are used for translating Domain Names to IP Numbers. They also contain the domain name’s name server and mail server information as well as any other domain name aliases. A commonly used alias is the “www” preceding the domain name.