Comscore Crawler
Comscore operates measurement infrastructure. Historical IPv4 aggregates (e.g. 77.72.112.0/21) and AS46125/AS42320 still appear in older allowlists, but modern Comscore crawler traffic is frequently observed from AWS (AS14618) rather than Comscore-originated ASNs alone.
Comscore’s crawler and measurement fetchers are often seen on Amazon AWS infrastructure (AS14618), not only on legacy Comscore-announced space. Treat older static lists and AS46125/AS42320 as incomplete for current crawler allowlisting - validate with live traces and Comscore.
Autonomous systems
Legacy / historically cited Comscore ASNs
AS46125 and AS42320 remain commonly cited for historical Comscore-related routing; crawler egress today often maps to cloud providers (see AWS below).
Third-party hosting & clouds
Amazon.com, Inc. (AWS)
Current Comscore crawler and measurement traffic is frequently observed from AWS addressing (AS14618). Combine with Comscore documentation and your own packet captures.
Published ranges
Comscore IPv4 prefixes (legacy aggregate)
Maintained feedMaintained /feeds/comscore.json aggregate (77.72.112.0/21) for legacy reference. May not represent where Comscore crawlers egress today; see operational note on AWS (AS14618).
Documentation
Published prefixes
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77.72.112.0/21