What is a hostname and port?
sobes.tech AI
Answer from AI
The hostname and port are two key components used for identifying and accessing network resources.
Hostname is a unique human-readable identifier for a device or server on a network. It can be:
- Fully Qualified Domain Name (FQDN): for example,
www.google.com, which includes the hostname (www) and the domain name (google.com). - Local hostname: for example,
MyPCorWebServer, used within a local network.
The Domain Name System (DNS) translates the hostname into an IP address needed for routing data on the network.
Port is a numerical value (from 1 to 65535) used to identify a specific process or application running on a server. When data arrives at a specific IP address, the port indicates which application should handle this data.
- Well-known ports (1-1023) are reserved for standard network services (e.g., 80 for HTTP, 443 for HTTPS, 22 for SSH).
- Registered ports (1024-49151) can be registered by organizations for their applications.
- Dynamic/private ports (49152-65535) are used temporarily by clients when establishing connections or for specific applications.
The combination of an IP address (or hostname) and port uniquely identifies a specific service on a specific machine in the network.
Example: When requesting a webpage http://www.google.com:80/, you use:
- Hostname:
www.google.com(which is translated into an IP address) - Port:
80(the standard port for HTTP)
This indicates the need to connect to the web server (www.google.com) via the HTTP protocol (through port 80) to retrieve the requested page.