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Google Desktop Search
Port 4664 is primarily associated with Google Desktop Search, an application developed by Google to index and enable quick search functionality over a user's local files and emails. This port facilitates communication and management of search queries between the user interface and the local indexing service. Though Google Desktop was discontinued, references to this port can still be found in legacy environments or within archived software setups..
Google Desktop Search was a desktop search application developed by Google that allowed users to perform full-text search of emails, files, music, photos, chats, and web pages viewed. The application created an index of the contents on the host machine, enabling fast keyword searches. Port 4664 was utilized by the local HTTP server component embedded in Google Desktop Search to provide a web-based user interface accessible from the browser.
When active, the embedded web server on 127.0.0.1:4664 responded to queries by delivering indexed results via a familiar Google-style webpage. Communications primarily occurred over HTTP with no encryption, designed for local communication between services or from the web browser to the internal service.
Despite being deprecated, some residual installations or archival product copies might still use this port for search integration within the host operating system. Since it was not designed as a cloud service endpoint, network exposure of this port was neither necessary nor recommended.