United States v. Christie, 624 F.3d 558 (3d Cir. 2010) (full-text).
Factual Background Edit
This case originated when the FBI acquired the IP addresses of computer users who were accessing child pornography websites. The FBI then requested the names of the users linked to these IP addresses from their ISP.
Appellate Court Proceedings Edit
Applying the third-party doctrine, the court held that "no reasonable expectation of privacy exists in an IP address, because that information is also conveyed to and, indeed, from third parties, including ISPs. IP addresses are not merely passively conveyed through third party equipment, but rather are voluntarily turned over in order to direct the third party's servers."
- ↑ 624 F.3d at 574 (internal quotation marks omitted).