RampID Explained: The Identity Infrastructure Behind LiveRamp

Fragmented identity is one of the most expensive problems in modern marketing. When you can't connect a customer's browsing session to their in-store purchase or tie a CTV ad impression back to a conversion, your measurement falls short, and your budget goes to waste. 

RampID is LiveRamp's durable, interoperable identifier — the identity backbone that can connect marketing signals across devices, channels, partners, and platforms to enable accurate audience activation and measurement.

Key takeaways

• RampID is a persistent, durable identifier built on authenticated first-party data — not probabilistic guesses or hashed emails (HEMs).
  
• It can connect customer signals to 500+ partners, publishers, and platforms while supporting consumer security through unique, partner-specific encodings.
  
• According to a recent Comscore report, LiveRamp delivers a 99.5% match rate on full PII and an 89.8% match rate on email alone vs. a 40-60% industry baseline for HEM-only solutions.

What is RampID?

RampID is LiveRamp's people-based identifier. It links customer data across devices, channels, browsers, and platforms through a tokenized identifier for each individual or household – all while supporting consumer privacy.

The average person has many data points associated with them across the channels and devices — email addresses, phone numbers, postal addresses, device IDs, and more. Hashed emails and cookie-based identifiers rely on just one of those signals, limiting match rates and addressability. RampID is built on our identity graph, which can resolve multiple signals associated with an individual to a single, tokenized identifier with a level of precision that inferred or probabilistic approaches cannot match.

That distinction matters more than ever. In a landscape shaped by the rapid rise of AI-powered marketing, the quality of your identity layer determines the quality of every decision that follows. As Erin Mitten of Publicis noted at RampUp 2026, "[Marketing] is a fantasy if you don't have deterministic identity driving it."

Deterministic matching links identifiers using verified data points like email addresses, phone numbers, and authenticated logins. Probabilistic matching infers connections from behavioral patterns (like shared IP addresses) — expanding reach, but introducing uncertainty that compounds at every step of the funnel. 

RampID is grounded in deterministic resolution. The result is an identifier that marketers can trust at every stage — from campaign planning to AI model readiness to attribution.

How does RampID work? 

Your customer data lives in dozens of systems, platforms, and partners. Here is how RampID connects those signals through a tokenized identifier.

Data onboarding and identity resolution

It all starts with your first-party data: CRM records, transaction logs, loyalty programs, digital interactions. When you onboard that data to LiveRamp, the identity resolution infrastructure matches the emails, phone numbers, postal addresses, device IDs, and authenticated logins that belong to the same individual. 

The output is a single RampID created through a secure, deterministic matching process that enables consistent recognition across channels and platforms. Even when customer data is incomplete — a common scenario for marketers — LiveRamp's identity graph achieves a 97.8% consistency score, resolving the same identity regardless of gaps in the input data.

The identity graph: connecting signals across environments

Once resolved, RampID serves as a tokenized thread that connects identifiers used in different environments where individuals interact with your brand. A customer who browses your website on a laptop, sees your ad on CTV, and purchases through your app can be recognized as one person — not three separate records.

This cross-environment connectivity is what separates an identity infrastructure from a simple identifier. An identifier recognizes a user on a single network. LiveRamp’s identity graph links that recognition across devices, channels, and platforms globally, and RampID is the persistent key that carries it to various touchpoints. 

Privacy architecture

RampID supports the principles of privacy by design. It replaces directly identifiable data with a tokenized identifier, and — critically — each partner receives a unique encoding. This means two companies referencing the same individual will see different RampID values, designed to prevent the universal tracking risks associated with hashed emails or shared cookie pools. Raw PII remains tokenized during collaboration, activation, or measurement. 

Interoperability across the ecosystem

No identifier operates in isolation — its value depends on where it's accepted. RampID is integrated across more than 500 partners, including DSPs, SSPs, data providers, and media networks to cover across destinations that comprise 92% of consumers’ engaged digital time. On CTV alone, RampID connects to Netflix, Amazon Prime, NBCUniversal, Paramount, Disney, and more. It is also interoperable with other industry identifiers such as UID2 and OpenID. RampID works wherever your data needs to go, across every cloud, every channel, and every partner.

Why is RampID a strong identity foundation for AI-powered marketing? 

AI is transforming how marketers plan, activate, and measure campaigns. But AI models are only as accurate as the data they have access to — and that data is only as accurate as the identity layer beneath it. This is where RampID will become indispensable.

When customer records are fragmented or matched probabilistically, AI models inherit those errors. They optimize against duplicated profiles, misattributed conversions, and incomplete journeys. The result is not just a single error but compounding inaccuracy, as each optimization cycle reinforces flawed signals.

At RampUp 2026, LiveRamp CEO Scott Howe described the current environment as a "war for signals" and framed the stakes clearly: brands that control the quality of their data and identity infrastructure will lead in the AI era, while those that don't will remain dependent on commoditized models that every competitor can access.

RampID vs. alternative identity approaches

Your identity layer is a decision with downstream consequences. The identifier you build on determines your match rates, your measurement accuracy, and the quality of every AI model that you build. Here is how the most common approaches compare.

Hashed emails (HEMs)

Hashed emails are widely adopted because they are easy to implement, but they rely on a single identifier that breaks when customers change emails, use different addresses across platforms, or interact across devices where no email is present. HEMs are standardized and lack per-partner encoding, creating a higher risk of unintended cross-platform correlation. Because both parties must hold the same email in the same format, match quality degrades at every hop in the supply chain. 

The performance gap is substantial. RampID delivers an 89.8% match rate on email alone — versus a 40–60% industry baseline for HEM-only solutions. That means reaching nearly twice as many known customers. One leading data provider saw this firsthand, scaling beyond HEMs with LiveRamp to lift match rates to over 95%.

Probabilistic identifiers

Probabilistic IDs expand addressable reach by inferring identity connections from behavioral signals (like shared IP addresses or device proximity on a Wi-Fi network). However, higher reach comes at the cost of lower accuracy — a trade-off when those identifiers feed AI models, power attribution, or drive measurement. A match rate can look strong on a dashboard while quietly reaching the wrong households, wasting spend and eroding the trust your brand has built.

Warehouse-native activations

A growing number of vendors offer a composable customer data platform (CDP), which activates data directly from the customer data warehouse instead of routing it through a dedicated identity platform. This can work for basic activation use cases, but most lack an identity graph entirely, along with the breadth of a partner network and the governance infrastructure needed for cross-partner data collaboration and measurement. 

Without an interoperable identity spine, the composable CDP approach creates fragmented, one-hop connections that can’t scale across the ecosystem — or match LiveRamp's 90% average reach at top activation destinations.

How marketers use RampID: From identity to impact

The value of a deterministic identity foundation shows up across the full marketing lifecycle — from how you reach audiences to how you measure what's working.

Audience activation at scale

RampID enables you to reach known customers across CTV, social, programmatic, and emerging media channels using a single durable identifier. For example, Tailored Brands resolved all known and tokenized digital data to RampID and used it to connect in-store and online data for personalized experiences across the customer journey. This delivered a 26% increase in ROAS for Men's Wearhouse and a 42% lift in incremental revenue for Jos. A. Bank.

Cross-media measurement

When different channels — display, CTV, social, retail media — can be connected through a tokenized identifier, you can measure what is actually driving results instead of relying on siloed, last-touch attribution.

Indeed resolved their first-party data to RampID directly within their AWS environment, enabling precise campaign measurement alongside real-time bidding. This approach drove a 54% expansion of retargeting audiences and a 20% boost in ad engagement — giving employers clearer proof of which ads connected job seekers to the right roles.

Secure data collaboration

Your first-party data tells part of the story — a partner's data completes it. RampID enables brands and publishers to match and analyze data within clean room environments while minimizing data movement. Partner-specific encodings mean your data remains governed while still powering joint analytics, audience discovery, and campaign measurement. 

Delta Air Lines teamed up with LiveRamp to securely collaborate with partners like Paramount+, YouTube, and T-Mobile — connecting first-party data from its SkyMiles loyalty program with partner data to deliver personalized in-flight experiences for more than 200 million travelers, without revealing raw customer records between parties. 

AI model ready

Chalice AI uses LiveRamp's Embedded Identity on Snowflake to resolve its first-party data for custom predictive models, then activates those audiences via RampID across Meta, YouTube, and the open web. The partnership delivered a 75% reduction in time-to-launch for client audiences and approximately 20% lift across core performance KPIs.

Addressability across AI discovery surfaces

As consumers increasingly interact with AI-powered search and recommendation engines, RampID makes these new surfaces addressable and measurable. You can connect AI-powered interactions back to an identity, closing the loop between discovery and conversion in environments that were previously opaque. 
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LiveRamp's partnership with Perplexity is an early example: marketers can activate authenticated inventory on Perplexity's AI-powered answer engine via RampID, extending proven data-driven tactics to emerging AI destinations with the same identity consistency as CTV, social, and programmatic.

Build on the right identity foundation with LiveRamp

The identity layer you choose today determines the quality of every AI-powered decision, every measurement report, and every customer experience your brand delivers tomorrow.

RampID is the identity infrastructure that makes all of it work — with accuracy backed by independent, third-party validation from Comscore, interoperability across the broadest partner network in the industry, and privacy architecture built for a world where consumer trust and regulatory compliance are non-negotiable.

Contact us to learn how RampID can strengthen your identity strategy and power your next campaign.

Frequently asked questions about RampID

What is RampID?

RampID is LiveRamp's tokenized, people-based identifier. It connects customer data across devices, channels, and platforms through a tokenized identifier built on deterministic identity resolution, not probabilistic inference or hashed emails.

How is RampID different from a hashed email or cookie?

Hashed emails rely on a single data point that breaks when customers change addresses or switch devices, and they can be reversed to re-identify individuals. Cookies are device-specific and increasingly blocked by browsers. RampID is persistent across environments, resolves multiple identifiers to a single individual, and uses unique partner-specific encodings that prevent universal tracking.

How does RampID support consumer privacy?

RampID replaces directly identifiable data with a tokenized identifier. Each partner in the LiveRamp ecosystem receives a unique encoding, so no two partners can use RampID to track individuals outside their approved use case. This architecture gives brands the governance controls they need for responsible data collaboration.

How do I connect my data to RampID?

You onboard your first-party customer data through the LiveRamp Data Collaboration Platform. LiveRamp resolves your records, assigns a RampID to each individual or household, and makes those resolved identities available for activation, measurement, and collaboration across the ecosystem.

Is RampID the same as an identity graph?

No. LiveRamp’s identity graph is the underlying data structure that maps relationships between identifiers and links them to individuals or households. RampID is the persistent identifier that represents each resolved entity within that graph. Think of the identity graph as the foundation and RampID as the key that unlocks its value across the ecosystem.