Why start from almost nothing
Sometimes a record is more of a fragment than a contact, one field that came from a webform, a business card, or a partial CRM import. Rather than treating that record as unusable, reverse appending uses the one reliable data point you have as the anchor to build out the rest of the profile, so a fragment becomes a usable contact instead of dead weight in your database.
Three reverse appending services
- Reverse email appending — start with an email address, add mailing address and phone number
- Reverse phone appending — start with a phone number, add email and mailing address
- Reverse B2B data appending — start with any single company or contact identifier, build out the full profile
How it works
Send your database
Share the records that have one reliable data point, whatever field that happens to be.
We check for matches
Our experts check your data against internal databases spanning 160M+ records for a match.
Missing fields added
Relevant contact information is added per your request, verified before delivery.
You receive the file
A high-quality, ready-to-use database is returned, typically within 4 to 5 business days.
Who uses reverse appending
A growth marketer has a list of webform submissions with just an email address and needs company, title, and phone data to qualify and route the leads.
A data operations team is salvaging records from a legacy system where only a phone number survived the migration, and doesn't want to write off thousands of contacts as unusable.
A partnerships team receives a co-marketing list with inconsistent fields, some records have an email, others just a company name, and needs everything built out to a consistent standard.
Why teams use reverse appending
- Access to sales-ready prospects built from a single known data point
- Complete business data for outreach across multiple industries
- Better lead engagement from more complete contact profiles
- Increased customer retention through more accurate targeting
Before you commit
- Match-rate concerns: not every record will find a match, but you're only charged for successful ones.
- Accuracy concerns: 95%+ accuracy with real-time verification on everything that is matched.
- Cost concerns: pricing depends on database size and fields requested. Upload a sample first for an estimate.
- Compliance concerns: data is 100% verified and permission-passed, in line with GDPR and CAN-SPAM.
Frequently asked questions
What types of reverse appending services do you offer?
Reverse phone appending, reverse email appending, and reverse B2B data appending.
How effective is reverse appending?
With the right integration on your end, reverse appending consistently generates usable, complete records from a single starting data point.
Is reverse appending useful for all B2B organizations?
Yes. Reverse appending is applicable across all B2B sectors, wherever you have one reliable data point and need the rest of the contact's details.
What's the difference between appending and reverse appending?
Standard appending starts from a partial record and fills in missing fields. Reverse appending starts from a single data point, an email or phone number, and builds out the rest of the contact's profile from there.
How accurate are the profiles you build?
Data Mappers offers 95%+ accuracy with real-time verification, matched against a 160M+ record database compiled from public filings, business directories, and verified partner sources.
What if you can't find a match for one of my records?
Not every record will match. You're only charged for successful matches, and unmatched records are flagged so you know which ones still need another approach.
How is this priced?
Pricing depends on database size and which fields you want built out. Upload a sample for an accurate estimate before committing the full file.