IP Address Lookup
A hostname (also known as a "node name", "computer name", or "site name") is a unique Fully Qualified Domain Name (FQDN) that identifies every hardware device (host) connected to the internet via the Domain Name System (DNS) naming hierarchy. Historically, hostnames represented a name resolution for IP addresses.
They are the absolutely and uniquely differentiating addresses that computers use to communicate with each another within a network, be it local network (LANs) or global networks like the internet.
Simply put, the hostname is the nickname given to any computer or device hooked up to a computer network. Each internet user gets this one-to-one description, regardless of whether it's a network node at the internet provider, a computing machine, or a web server.
Since hostnames are frequently confused with domains, it's good to know that multiple hosts can be grouped under one domain, just like subdomains. Sometimes domain names are the same as hostnames, but this is not a general rule. In IT architecture, hostnames have the role of differentiating clients.
A hostname is the concatenation of a computer's name and a domain name (computername.domainname.com). The role of a hostname is to increase readability since it's easier to remember than an IP address. In many situations, hostnames and IP addresses are considered interchangeable simply because all hostnames are linked to IP addresses.
According to the RFC 1123 protocol, the hostname's total length is limited to 255 characters, and it comprises the hostname and the domain name labels separated by periods.
Here is an example of a typical hostname that would be stored in a DNS for geolocating the hostname's address and would be assigned to a PC connected to the internet via Comcast: "c-61-123-54-66.hsd2.co.comcast.net" where: 188.8.131.52 is the hostname's IP address, "CO" stands for Colorado, and comcast.net is the ISP hosting the end-user.
On the internet, a hostname refers to the domain name attributed to a host computer. For instance, if Computer Ben's network has two computers named "River" and "John", the domain name "river.computerben.com" connects to the "river" computer. The IP address of the "river" computer is acquired by looking up the hostname "river.computerben.com" in the host's file or DNS resolver.
If we refer to an internet location or a website (for instance, computerben.com), the hostname is typically seen as a domain name and is within the address typed into a web browser to access a webpage. When it contains a Top-Level Domain (TLD), the hostname is considered an FQDN. For instance, the format of an internet address is http://www.exampledomain.com/examplefile.html where:
Depending on the network type and protocol, hostnames must meet international standards and follow specific rules:
Hostnames naming conventions, rules, and restrictions include:
The RFC 1123 protocol specifically recommends the following:
The sequence between periods is a label. Labels cannot end or begin with a hyphen and can only have between 1 and 63 characters.