Live police scanner feeds are streamed online at RadioReference.com, Broadcastify.com, Ustream.tv and TuneIn.com, according to About.com. Most of these online services stream other content besides police scanner feeds.
In addition to providing a comprehensive list of police scanners, RadioReference.com features many forums in which listeners can discuss the scanner feeds, states About.com. Broadcastify.com streams a wide variety of public safety communications, including those from aircraft, marine and rail audio as well as police scanners. While basic listening is free, additional features are available for a fee.
Ustream.tv primarily streams video content but also carries police scanner feeds. TuneIn.com streams live feeds from air traffic and fire department communications as well as police scanners; listening is free, and local feeds are provided first.