Internet TCP port 43 is primarily used by the WHOIS protocol, a query and response protocol that is widely used for querying databases that store the registered users or assignees of an Internet resource, such as a domain name, an IP address block, or an autonomous system. This protocol is used by network administrators to identify and fix issues related to these resources. Examples of software that use this port include the WHOIS clients that come with many operating systems, and web-based WHOIS lookup tools.
No information available
