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gclid Format / decoding

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# 1
Visitor ✭ ✭ ✭



Please help, i need information , the format of GCLID.
I don't know how can i decode it,
what is the exact information coded, to the GCLID variable?

So, when i inspected our client webserver logs, i found many same gclid (the first 26 chararcter of the gclid was same) but the requests from come many different IP-s. 


- Same gclid but many different IP-s, on the same days Smiley Sad

what is it meaning? Cheat anybody on them?



1 Expert replyverified_user
Marked as Best Answer.
Accepted by Dave_Davis (Top Contributor)
September 2015

Re: gclid Format / decoding

Top Contributor
# 2
Top Contributor
Hi Zoltan
The ID corresponds to a cookie set on the users machine and it helps Google track campaign and conversion data.

There are perfectly valid reasons that an ID could have many IP addresses, and some not valid. I'd check the "invalid clicks" column in AdWords to see if Google is catching anything suspicious. I'd also have a read about how Google handles these here: