X-Pcrew-Blocked-Reason
The HTTP X-Pcrew-Blocked-Reason response header is an unofficial header used by the ParkingCrew domain monetization platform to indicate why a request was blocked or filtered.
Note
The "X-" naming convention for HTTP headers, "X" referring to "experimental", has been deprecated and needs to be transitioned to the formal naming convention for HTTP headers.
Usage
ParkingCrew serves advertising on parked domains and depends on traffic quality to maintain advertiser value. Requests from hosting networks, data centers, crawlers, and other automated sources do not represent legitimate visitor traffic and are filtered before reaching monetized content.
When ParkingCrew's filtering system determines a request does not meet its traffic quality criteria, the platform records the reason in the X-Pcrew-Blocked-Reason header. This provides a diagnostic signal visible in response HTTP headers, explaining the filtering outcome without requiring access to internal logs.
The header appears alongside X-Pcrew-Ip-Organization, which captures the network organization of the requesting IP. The two headers together provide a full picture of why a particular source was filtered: the organization reveals what network the traffic came from, and the blocked reason states the policy applied.
Values
Blocking reason description
The value is a short human-readable string describing the category of traffic triggering the filter. The value reflects ParkingCrew's internal traffic classification policies.
Common values include:
hosting network: the request originated from a cloud provider, VPS host, or data center IP rangebot: the request was identified as automated traffic
Example
A request from a DigitalOcean IP address is classified as coming from a hosting network. ParkingCrew attaches the blocking reason to the response.
X-Pcrew-Blocked-Reason: hosting network
Both PCREW headers often appear together, with the IP organization providing context for the blocking decision.
X-Pcrew-Ip-Organization: Digital Ocean
X-Pcrew-Blocked-Reason: hosting network
Takeaway
The X-Pcrew-Blocked-Reason header records the reason ParkingCrew filtered a request. The value reflects the traffic quality policy applied, with hosting networks and automated sources among the most common categories.