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United Internet

Digital Advertising, Internet Services, Telco

United Internet provides advertisers access to tens of millions of authenticated, logged-in users across Germany's top email and portal platforms, enabling precise, consent-based digital advertising without reliance on third-party cookies.

Last updated Jul 20, 2026 by the ATDb Editorial Team

Founded
1988
HQ
Montabaur, Rhineland-Palatinate, Germany
Connections
2

At a glance

Employees
10001+
Revenue
€5B–€6B annually
Stock
UTDI
1integrations1joint ventures
Customer Data PlatformNative AdvertisingMarketing Platform

About

Dominant German internet conglomerate with one of Europe's largest authenticated email user bases, enabling first-party data advertising at scale

United Internet AG is one of Europe's largest internet companies, headquartered in Montabaur, Germany. Founded in 1988 by Ralph Dommermuth, the company has grown into a multi-brand conglomerate encompassing consumer internet access, cloud services, email platforms, and digital advertising. Its core brands — 1&1 (broadband and mobile), GMX, WEB.DE, and mail.com — collectively reach tens of millions of registered users across Germany and Europe, making United Internet a significant player in the digital advertising ecosystem through its owned-and-operated media properties.

Business model

Diversified — Subscription, Advertising, Marketplace

Target market

Enterprise, SMB, Consumers

What they offer

  • 1&1 Broadband & Mobile

    Consumer and business internet access, DSL, fiber, and mobile services under the 1&1 brand

  • GMX

    Free email and portal platform with tens of millions of users in Germany and Europe, used as an advertising inventory source

  • WEB.DE

    Leading German email and web portal offering advertising inventory to brands targeting German-speaking audiences

  • mail.com

    International email platform extending United Internet's reach beyond German-speaking markets

  • United Internet Media

    The advertising sales house leveraging GMX and WEB.DE audiences for digital display, native, and email advertising

  • IONOS

    Cloud and web hosting subsidiary offering domain registration, web hosting, and cloud infrastructure for businesses

  • 1&1 Versatel

    B2B fiber network and telecommunications services for enterprise customers

Key features

First-party authenticated user data from logged-in email usersLarge-scale German and European digital advertising inventoryConsent-based targeting without third-party cookiesCross-platform reach across email, portal, and mobileIntegrated telco and internet services ecosystemHigh-frequency user touchpoints via email platform engagement

Use cases

Brand advertising targeting German-speaking audiences via premium email portalsPerformance marketing leveraging authenticated user segmentsNative advertising within high-traffic email and portal environmentsB2B cloud and hosting solutions for SMEs via IONOSBroadband and mobile connectivity for consumers and businesses via 1&1

Customer segments

Consumer internet users (email, portal)SMB and enterprise advertisers targeting German audiencesSmall and medium businesses (IONOS hosting/cloud)Broadband and mobile subscribers (1&1)B2B enterprise telco customers (1&1 Versatel)

Tech & specs

Technology stack

Proprietary email and portal infrastructureFirst-party data management platformAd serving technology (United Internet Media)Cloud infrastructure (IONOS)Fiber and mobile network infrastructure

Security & compliance

GDPRGerman BDSG (Federal Data Protection Act)ISO 27001 (IONOS)BSI IT-Grundschutz

Deployment

CloudManaged Service

API

Limited

Corporate history
  1. 1988 · Founded
Connection details

Explore further

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