Neustar

Overview

Neustar, acquired by TransUnion in 2021 and now operating as TransUnion's marketing solutions division, is an identity resolution and marketing data platform. It links anonymous website visitors to offline identity profiles using probabilistic and deterministic matching techniques, enabling advertisers to target known audiences across channels. Neustar scripts appear on advertiser and publisher websites to collect behavioral data signals used in this identity matching process.

What This Script Does

Neustar's client-side scripts load tracking pixels and set cookies on visited websites to collect behavioral signals including page URLs, referrer data, browser fingerprint attributes, and IP-derived location signals. These signals are matched against Neustar's identity graph — a database linking digital identifiers to household-level profiles containing demographic, financial, and purchasing attributes sourced from TransUnion credit bureau data and third-party data providers. Cookies set by Neustar scripts may use the domain neustar.biz or related TransUnion domains. The matched data enables advertisers to serve targeted ads, suppress already-converted customers, and measure campaign performance across digital channels. Neustar also provides tag management and analytics measurement services that collect conversion event data for attribution reporting. Data collected on one website may inform targeting decisions across the broader Neustar/TransUnion advertising network.

Consent & Compliance

Neustar's identity resolution model involves processing personal data at significant scale, combining online behavioral data with offline consumer records from credit bureau sources. This type of processing is subject to heightened scrutiny under GDPR, as it involves profiling linked to sensitive financial attributes and requires a lawful basis beyond legitimate interests for most EU use cases. Under the ePrivacy Directive, behavioral tracking cookies require prior consent. Neustar participates in the IAB Transparency and Consent Framework (TCF) as a registered vendor, enabling consent management through TCF-compliant CMPs. Under CCPA/CPRA, Neustar's processing clearly constitutes sale and sharing of personal information for cross-context behavioral advertising, and California residents have the right to opt out. TransUnion is a US company; EU data transfers rely on SCCs and potentially the EU-US Data Privacy Framework. The integration of credit bureau data into digital advertising profiles raises additional regulatory questions under FCRA in the US. Consent categories: marketing and analytics.

Should You Block This Without Consent?

Yes. Neustar scripts perform identity resolution and behavioral tracking for advertising targeting purposes. This processing requires prior consent from EU visitors under GDPR and the ePrivacy Directive, and California residents must be provided an opt-out mechanism. These scripts should be blocked until marketing and analytics consent is granted.