Obtain a clickstring (a.k.a., click tag)
When troubleshooting ad trafficking and delivery, the most important item to capture is the clickstring, or click tag. The clickstring is the URL that takes the user to the ad. Visit Publisher University for the full details on capturing a clickstring.
Capture a clickstring from a computer
Right-click on the ad and copy the link address. If you can't right-click on the ad, use the method below, under "Capture a clickstring from a mobile device."
Capture a clickstring from a mobile device
Disconnect from any internet or cellular service, then click or tap the ad. The ad will attempt to open in a browser window, but because there's no service it will not load. However, the clickstring will be exposed in the URL. This approach can also be used on a computer.