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Comment: Added PB:36 per TW-978

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Passback ReasonReason codeDescription
Impression not passed back0

For tag-based impressions: All impressions were monetized by PubMatic.

For header bidding impressions: PubMatic submitted a bid (this does not necessarily mean PubMatic won the bid).

Passback due to incorrect aggregator integration - missing kadpage URL/Page URL/Site Code1Impressions passed back due to Domain/URL not being sent in the request to PubMatic.
Spider/bot traffic with invalid web browsers4Impression was passed back as the request was not sent via a valid browser.
Spider/bot traffic with valid web browsers5

Traffic originating from cloud services such as Amazon servers, Windows Azure Cloud or Google Cloud tend to be generated by automated programs trying to mine the web or scan content rather than humans browsing web content.

Info

Please contact your Account Manager to provide the most recent list of blocked IPs.


Spider/bot traffic for which blank responses submitted to publisher6Impression passback due to bot traffic.
Blocked alternative page URLs8

Impression passed back due to URL (from where the request is generated) is in PubMatic's Global Block list.

Info

Please contact your Account Manager to obtain a list of all domains on the Global PubMatic Blocklist and evaluate if any domains should be removed.


Blocked page URL9

Impression passed back due to URL (from where the request is generated) is in PubMatic's Global Block list.

Info

Please contact your Account Manager to obtain a list of all domains on the Global PubMatic Blocklist and evaluate if any domains should be removed.


Blocked referral URLs10

Impression passed back due to URL (from where the request is generated) is in PubMatic's Global Block list.

Info

Please contact your Account Manager to obtain a list of all domains on the Global PubMatic Blocklist and evaluate if any domains should be removed.


Blocked IP addresses11

Impression blocked due to the request from a blocked IP address.

Info

Please contact your Account Manager to provide the most recent list of blocked IPs.


Passback through passback network25Impression was passed back post auction as no valid bids were registered from the demand.
Fraud traffic26Impression passed back has a "failed" status in an inventory quality scan via WhiteOps.
Blocked countries by PubMatic27Bids blocked due to blocking business to and from countries and locations that have trade embargoes.
Blocked countries by publisher28Bids blocked due to blocking business to and from countries and locations that have trade embargoes.
Unauthorized in ads.txt29

Impression passed back due to an ads.txt filter. PubMatic will not allow an impression into an auction unless there's a proper ads.txt entry for the domain from which the impression is generated.


Missing GDPR consent30Impression passed back due to no consent received for impression subject to GDPR.
Unauthorized in app-ads.txt34

Impression passed back due to an app-ads.txt filter. PubMatic will not allow an impression into an auction unless there's a proper app-ads.txt entry for the domain from which the impression is generated.


Impression Throttled Due to MLAggregation Model36Impression passed back by machine learning (ML) model for lack of demand, in order to reduce load on PubMatic infrastructure. Learn more about PubMatic machine learning and bid throttling. If you have any further questions, contact your PubMatic Customer Success Manager.