Complete More of Your Customer Profile
Add missing contact and marketing fields where your records can be matched.
Review input requirements, available coverage and output before processing.
Start with your existing records
Compare with reference data
Return available fields
Check results before importing
Data Appending Options
A data append matches identifiers in your customer file against reference sources and returns available missing fields. Choose email, phone, household or company attributes to support a defined CRM task. Coverage depends on the input and product; an unmatched row must remain distinguishable from a completed record.
Choose the Matching Level
Contact appending may link to an individual, household, company or location. Confirm which entity each value describes and whether it is reported, compiled or modeled. A household estimate is not a verified fact about every resident.
Protect Trusted Values
Keep customer-supplied values separate from results until reviewed. Agree on fill-only or alternative outputs. Matching does not establish outreach permission; retain opt-outs and apply channel requirements.
Data Quality Before Import
Use stable record IDs and a field dictionary for data review. Ask how ambiguous and missing values appear, which quality checks are included and how results map into your CRM software. Reconcile counts and sample rows before updating the database.
Choose a Marketing Use Case
Append Inputs and Outputs
Use the table to scope your request. Reverse append services start with an existing contact point; confirm available data before ordering.
| Append type | You provide | You get back |
|---|---|---|
| Email append | Name and postal address | Email address where matched |
| Phone append | Name and postal address | Landline or mobile number where matched |
| Reverse append | Email address or phone number | Name and postal address where matched |
| Address append | Name plus partial address | Available corrected or updated address, subject to the selected service |
| Demographic append | Name and postal address | Available consumer or household attributes, with field definitions |
| Firmographic append | Company name and address | Available industry, employee and organization-age fields |
Coverage and Billing
Coverage depends on identifier quality, record age and reference sources.
Confirm the matching rules, duplicate handling, billing unit and minimum before ordering.
For accurate data, provide complete names, recent data and standardized addresses. Flag missing ZIP codes, unit details and mixed household or individual data before processing.
How the Process Runs
- Send a CSV or Excel sample to confirm possible appends.
- Confirm test-match options, matching level and billing unit.
- You approve, we process the full file.
- Reconcile matched, unmatched and exception records before importing.
Your file stays your file. We do not add your records to any list we sell.
Prepare the Source File
Resolve duplicates and incomplete identifiers first. Keep an original copy and define blank-value handling. Identify the customers or accounts you need to update; reliable data starts with a clear matching unit.
Before the Full Import
Database Checks
Test a small set in the target database before applying the full result. Confirm that corporate records stay separate from personal contacts and that existing values remain recoverable. Missing employment information needs its own supported field and update definition; a matched phone number alone does not verify someone’s current role.
Talk to a Real Person About Your List
Tell us who you are trying to reach and we will pull counts, tell you which file fits, and quote it. If this category is wrong for your offer we will say so. Every List57 client works directly with us from the first question through delivery.
Call 619-678-1000
Email info@List57.com
Ready to Order?
Request a Project Quote
Tell us your file size, available fields and requested service so we can quote the right job. Confirm processing charges, any plan requirements and the delivery layout before ordering.
Also Worth Knowing
Stop Running Your Business on Sticky Notes
Plan a HighLevel workflow around reviewed results, contact permissions and clear field ownership.
Plan Your HighLevel Follow-Up
Review results before activating a campaign.
Review appended fields, permissions and suppression rules before importing data into HighLevel or other platforms.