I noticed that my AppleWorks update came from wsidecar.apple.com. They also use these subdomains:
- info.apple.com (support)
- developer.apple.com (development)
- store.apple.com (the online Apple Store)
- ipod.apple.com -> www.apple.com/ipod (iPods)
- quicktime.apple.com -> www.apple.com/quicktime (QuickTime)
- download.apple.com
- itunes.apple.com
- macosx.apple.com
- support.apple.com