Data Append Services


Modeling AnalyticsRealSource’s landline and mobile phone append service provides you with an accurate and fast way to add phone numbers to your house (customer or prospect) files. RealSource’s customized phone append solutions give you the best coverage for your appending needs by blending multiple data record sources. Our append service gives you a comprehensive resource of directory assistance and compiled telephone number listings for the U.S., Canada, and Puerto Rico.

  • Daily updated telco-sourced consumer and business directory assistance listings with over 170 million records.
  • Over a dozen sources of close to 215 million compiled listings from white and yellow page directories nationwide.
  • Multiple levels of match logic for the perfect balance of match rate and accuracy,

RealSource offers you the most comprehensive and accurate coverage for the highest match rates coupled with precision accuracy.


Enhance your ability to communicate with your customers through RealSource’s Email Append service. Whether you are looking to upsell, cross-sell, or re-engage less active customers, email channel communication, when performed properly, is arguably the most cost effective manner of customer communication. RealSource has one of the largest databases of email addresses with over 1.5 billion input records powering the database. Our email data is verified and validated to identify and eliminate email addresses associated with role accounts, complainers, hard bounces, invalid domains, and spam traps.

  • The data is compiled from third-party opt-in data
  • Each email address is scored based on several factors including the number of reported sources
  • Monthly updates to add new records and delete old records

Like our other data append products, RealSource uses customized match logic to balance match rate and accuracy. Not only do we maintain a meticulously compiled database for append and reverse append projects, but we also house a separate suppression file of over 460 million records. These are email addresses that are obsolete, fraudulent, spam traps or complainers – none of which you want to add to your customer database as the results can negatively affect your online sending reputation. These addresses are suppressed from our email append file.


Utilize RealSource’s database of over 422M Mobile Device ID’s to enhance your existing database and increase your ability to communicate with your target audience through digital advertising.  RealSource can verify and validate your existing Devise ID file as well as append Device ID’s along with the IP Address, Lat/Long, URL, and Time/Date Stamp.

RealSource Inc. 1144 E. State Street, Suite A #192, Geneva, IL 60134 | Phone: 888-340-5479 | Fax: 630-208-1851
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