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Reverse Phone Append Services

For Marketing & Lead Validation

Transform anonymous phone numbers into comprehensive customer profiles via our high-performance reverse phone api. We provide high-accuracy reverse append services with up to a 90% match rate, identifying the person and address behind every number. Professional data enrichment starting at just $0.02 per match.
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CCPA/GDPR Ready | Real-Time Phone Identification | 700M+ Verified Records
700 Million

Phones

250 Million

Consumers

200 Million

Updates

Trusted by:

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The image shows the Ford logo, featuring the word Ford in white script inside a dark oval with a white border.
Black Chevrolet logo featuring a bowtie shape above the word Chevrolet in bold uppercase letters, both on a light background.
The Girl Scouts logo features the words girl scouts in bold black lowercase letters next to a solid gray trefoil symbol.
State Farm logo with three interlocking ovals on the left and bold black "State Farm" text on the right, set against a light gray background, representing trusted customer data services.
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Our PROVEN TRACK RECORD

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Verified Phone Records linked to real, physical identities.
0 + Million
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Daily updates processed from national telecommunications carriers.
0 Million
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Peak accuracy for consumer reverse appending projects.
0 %
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The most competitive reverse appending service price for Enterprise data.
$ 0

Stop Guessing Who is Calling: Turn Fragmented Data into Intelligence

A phone number without an associated name or address is an incomplete asset. Whether it’s an inbound lead from a web form or a legacy database of disconnected contacts, fragmented data prevents personalized outreach and exposes your business to unnecessary risk.
The Solution: The Data Group’s reverse phone append engine and phone number lookup api bridge the anonymous-to-physical gap. By using our reverse append services, you gain a 360-degree view of your contacts, enabling smarter lead routing, better CRM segmentation, and safer, more effective outreach.
Free trial data test
A table with three columns—Client Name, Phone Number, and Status—displays customer data services: John W.: +13654875; Margo R.: +19865489, validated; Will D.: +25654589, added.

Validate Inbound Leads & Reduce Fraud with Reverse Appending

In high-stakes industries like Finance, Non-Profit fundraising, and Voter outreach, knowing your lead is a real person is your first line of defense. Our phone number validation api and reverse appending technology serve as a critical security and validation layer:
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Identity Linkage

Linking multiple fragmented CRM records to the same phone number to ensure data consistency.
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Lead Scoring Intelligence

Use our phone validation api to instantly verify if the phone number provided matches the name and address in your records.
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Reverse Address Append Capability

Our service also functions as a reverse address append tool, ensuring every number is tied to a verifiable residential location.

What Makes Our Data Better?

Our team of experts leverages cutting-edge technology and extensive industry experience to provide comprehensive data solutions tailored to your business needs. We manage over 500 million Mobile Ad IDs and 1 billion privacy-compliant emails, ensuring your data is robust and reliable.

100%

Free data test

Try our data services risk-free with a complimentary data quality test before committing.

24/7

Personalized support
Frustrated by AI bots? Receive a real dedicated support person.

$0.02

For one record

Affordable data enhancement at just $0.02 per record, maximizing your marketing ROI.

The team at The Data Group always provides us with great data and great customer service.

National Ford Dealer

We have worked with The Data Group for over 15 years and they are our go to for high-quality data.

Marketing Agency

90%

Match rates

Trust our services to deliver up to 90% match rates, guaranteeing highly accurate customer data.

Data Output: Verified Identity & Expansion Options Data Specialists

Unlike basic lookup tools, The Data Group provides enterprise-grade data fields for deep analysis. Our standard output for every successful reverse phone append returns:
  • Identity Data: Full Name (First/Last) and verified Postal Address.
  • Data Expansion: Once we have the name and address, we can then append additional data points such as new emails, phones, and hundreds of demographics to further enrich the profile.
A table with three columns—Client Name, Phone Number, and Status—displays customer data services: John W.: +13654875; Margo R.: +19865489, validated; Will D.: +25654589, added.

Permissible Uses & Compliance

Data integrity and legal transparency are the pillars of our business. We operate under strict U.S. privacy regulations (CCPA/GDPR ready).
Compliance Notice: Our reverse appending service is designed for marketing, lead validation, and internal data enrichment. The Data Group is not a Consumer Reporting Agency (CRA). This data may not be used for FCRA-regulated purposes. This transparency is why enterprise legal teams trust TDG.

Ready to Enhance Your Customer Intelligence?

Stop guessing and start connecting. Upload your sample file today for a free 100-record data test.
Get My Free Test Key
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Industries

What Sectors We Serve

Nonprofits

01

We support charities, associations and membership organisations with data enrichment that increases deliverability, reduces waste and heightens engagement.

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Flexible ecosystem
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All-in-one CRM
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Live donor profiles
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Time-saving automation

Retail

02

From bricks-and-mortar chains to digital marketplaces, retail and eCommerce businesses rely on accurate contact, purchase-behaviour and demographic data to engage shoppers, optimise lifetime value, and maximise ROI on campaigns.

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Omnichannel identity linkage
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Real-time shopper insights
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Predictive buyer personas
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ROI-driven segmentation

Healthcare

03

In a regulated and data-sensitive environment, accuracy, compliance and engagement matter. We assist healthcare-providers, medical-device firms and pharmaceutical marketers in cleaning and enhancing patient, provider and HCP data for improved outreach, segmentation and campaign performance.

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Compliance-first architecture
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Verified HCP signals
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Fragmented Patient Data Linkage
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Regulatory-grade accuracy

We support charities, associations and membership organisations with data enrichment that increases deliverability, reduces waste and heightens engagement.

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Flexible ecosystem

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

All-in-one CRM

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Live donor profiles

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Time-saving automation

From bricks-and-mortar chains to digital marketplaces, retail and eCommerce businesses rely on accurate contact, purchase-behaviour and demographic data to engage shoppers, optimise lifetime value, and maximise ROI on campaigns.

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Flexible ecosystem

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

All-in-one CRM

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Live donor profiles

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Time-saving automation

In a regulated and data-sensitive environment, accuracy, compliance and engagement matter. We assist healthcare-providers, medical-device firms and pharmaceutical marketers in cleaning and enhancing patient, provider and HCP data for improved outreach, segmentation and campaign performance.

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Flexible ecosystem

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

All-in-one CRM

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Live donor profiles

A blue checkmark icon on a light gray background, symbolizing confirmation or approval.

Time-saving automation

The Blog

Industry Articles and News

What Sets a #1 Ranked Caller ID API Apart? Key Features to Look For
How Anonymous Website Visitors Can Become Leads
Why You Should Update Your Contact Lists and How Phone Append Helps
Why Your Organization Should Use an Email Append Service
Using Data Append to Improve Marketing Engagement
What is First, Second, and Third Party Data?
What Sets a #1 Ranked Caller ID API Apart? Key Features to Look For
How Anonymous Website Visitors Can Become Leads
Why You Should Update Your Contact Lists and How Phone Append Helps
The Blog

Industry Articles and News

What Sets a #1 Ranked Caller ID API Apart? Key Features to Look For
How Anonymous Website Visitors Can Become Leads
Why You Should Update Your Contact Lists and How Phone Append Helps
Why Your Organization Should Use an Email Append Service
Using Data Append to Improve Marketing Engagement
What is First, Second, and Third Party Data?
Services

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FAQs

Reverse Phone Append FAQs

Q: What is a reverse phone append?
A: It is a data enrichment service that takes a phone number and finds the owner’s name and postal address. We can also add additional data points such as phones, emails, and demographics.
A: We achieve up to a 90% match rate by using daily carrier updates and proprietary national datasets to ensure maximum freshness.
A: Forward append adds a number to a name/address. Reverse appending starts with the phone number and “works backward” to find the owner’s physical identity.
A: Line type identification is not part of our standard output but is available for an additional cost depending on volume. Contact support for an immediate quote.
A: We offer a transparent, direct-source rate of $0.02 per match. You only pay for successful matches—no setup fees or hidden costs.
A: Absolutely. Our database covers 700M+ records across all line types, including VoIP and toll-free numbers.
A: Most files are processed in less than an hour, often within minutes through our automated, secure portal.
A: Yes. Our system functions as a high-fidelity caller id api and phone verification api. Additionally, our reverse phone lookup api allows you to perform lookups instantly as leads fill out your web forms for immediate validation.
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Services

Data Append

Demographic Append

Email Append

Email Validation

Phone Append

Psychographic Append

Reverse Email Append

Reverse Phone Append

Programmatic

Anonymous Digital Retargeting

Audience Data

Enhanced Data Onboarding

Custom Mailing

Mailing Lists

API

Auto Append API

Demographic Append API

Email Append API

Email Validation API

Phone Append API

Reverse Email Append API

Reverse Phone Append API

Pricing

Contact Us

What Sets a #1 Ranked Caller ID API Apart? Key Features to Look For
Self-Service Login
Logo for The Data Group with THE in white text on a blue vertical background and DataGroup in bold black and gray text on a white background.
Free Trial
Services

Data Append

Email Append

Reverse Email Append

Email Validation

Phone Append

Reverse Phone Append

Demographic Append

Psychographic Append

Programmatic

Audience Data

Anonymous Digital Retargeting

Enhanced Data Onboarding

Custom Mailing

Mailing Lists

API

Pricing

Contact Us

What Sets a #1 Ranked Caller ID API Apart? Key Features to Look For
Self-Service Login