I blogged about CatalogURL’s last year already, but today I’d like to share the new ones for OS X 10.12 (data to be updated in the near future):
Regular Software Updates
You can check the CatalogURL with help of this terminal command:
sudo defaults read /Library/Preferences/com.apple.SoftwareUpdate CatalogURL
You can change the CatalogURL with:
sudo /usr/sbin/softwareupdate --set-catalog [URL]
Note: The CatalogURL’s will only work for secondary updates, after you have installed macOS 10.12. This cannot be used to install the first developer preview!