Because of the possible wide adoption and Intel's plans for broad uses for the PSN, it raises privacy concerns may not arise with other identifiers. Some expensive business computers, such as workstations sold by Sun Microsystems, do include a form of a PSN but they are not widely used by consumers. This small market share has prevented the adoption of their PSN as an identifier, except for limited software registration. When users of the Internet visit a web page, their IP address may be revealed to the web page machine. Users of America Online and many corporate networks use proxy servers which mask the identity of the users.
Users can also change their IP addresses by asking their system administrators or changing ISPs.
In addition, there are web-based services such as The Anonymizer that prevent the disclosure of their IP address. Ethernet IDs are not widely available and are not intended for identification. Ethernet identities are used for routing computers connected to networks via Ethernet and are not collected or used for identification purposes. Currently, most users connect to the Internet via modems and serial ports so Ethernet IDs are not used or disclosed. Many computers simply do not include Ethernet cards.