A registered HTTP alternate port, and the plaintext HTTP interface of every Chromecast.
IANA registers 8008 as http-alt, the same designation 8080 carries, so it is a legitimate second home for web servers — IBM HTTP Server and many appliances use it. On a home network the far more likely answer is a Google Cast device: pychromecast's DIAL client builds its device URLs as http://<ip>:8008, and that endpoint returns the device's eureka_info — name, model, firmware, Wi-Fi details — alongside the TLS control channel on 8009. Nmap sees 8008 open on roughly 0.7% of scanned hosts, making it one of the busier alternate HTTP ports.
Expose with care
As a web port it is as safe as the app behind it. As a Cast device it is not: the 8008 interface answers device-information and setup requests without authentication, so it must stay on the LAN.
$ curl -s http://TARGET:8008/setup/eureka_infoSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.