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In computer security, referer spoofing or ref tar spoofing is the sending of incorrect referer information along with an HTTP request, with the aim of gaining unauthorized access to a web site.

Some subscription sites, especially many pornographic paysites, utilize referer information to secure their materials: only browsers arriving from a small set of approved (login-) pages are given access; this facilitates the sharing of materials among a group of cooperating paysites. If attackers acquire knowledge of these approved referers (which is often trivial because many sites follow a common template), they can then gain free access to the materials.

Several software tools exist to facilitate referer spoofing. The Mozilla Firefox extension refspoof allows to use a custom referer URL for any site one visits, and provides a mechanism to manage a bookmark list of such referer/site pairs. A similar, more comfortable plugin is spooFXplorer (not compatible with the most recent version of Firefox). QuickSpoof and Spooph provide the same functionality for the Internet Explorer browser. SuperMegaSpoof is a Windows application that supports both browsers and allows users to exchange and rate referer spoofs; it displays advertisements while it is running. SpoofForge is similar to SuperMegaSpoof except it removes the need for a windows application and centralizes the spoofs on a web interface.

• Referer spam, providing fake referer information in order to popularize a spammer's website.

• Refspoof plugin
• QuickSpoof
• SuperMegaSpoof
• Shitforbrains.org, discussion forum for spoofs, download links for spoofXporer and Spooph
• SpoofForge.com, Web wiki of ranked adult spoofs