Data appending services that fill the gaps in your records Damco adds missing phone numbers, addresses, and fields from sources you approve
Data append services for the fields you're missing Each appended value carries its source, so you can trust it
How our data appending works Clean first, match second, and a person checks every unclear match
- Day 1Test a sampleWe append to a sample and show you the match rate before you commit.
- Week 1Clean the fileDuplicates merged and formats fixed, so more records find a match.
- Each batchAgents match and appendAgents match each record to your approved sources and fill the gaps.
- Each batchPeople check the doubtful onesA reviewer confirms or rejects every match the agents score as unsure.
- DeliveryThe owner signs offA named batch owner checks a sample and answers for the batch.
When B2B data appending is the right fit And when you need cleansing, enrichment, or new research instead
A good fit when
- Your records have names and companies but no phone numbers or addresses
- A campaign is planned and a third of the list can't be reached
- You want to know where each added value came from
Look elsewhere when
- You need emails only: see email appending
- You want industry, size, or revenue added: see data enrichment
- You have no list yet and need one researched: see web research
Types of data append services we offer What each append adds to your records, and how we check it
Phone number appending services
Phone number appending adds direct lines, mobile numbers, and office numbers to the contacts you already have. Agents match each contact on name, company, and location, then check the number's format and type against the country's numbering plan.
A sales team that calls a dealer list of 12,000 rows reaches the buyer instead of the front desk. Numbers we can't match with confidence stay blank rather than guessed.
Postal address appending services
Postal address appending fills in street, city, state, country, and postal code for current and potential customers. We standardize each address to the postal format of its country, so it prints and delivers the first time.
Moved contacts get their new address only when a source you approved confirms the move.
Business URL and social media appending services
We add company website addresses and public social profiles, such as LinkedIn company pages, to your B2B records. A reviewer checks that the profile belongs to the same company, not one with a similar name in another country.
Your marketing team can then target online campaigns and research accounts without searching for each one by hand.
Demographic data appending services
Demographic appending adds fields such as age band, household size, income band, and education level to consumer records, so you can segment and plan campaigns. We add only fields your sources hold lawfully and your use allows, and we agree that list with your legal team first.
Who uses B2B data appending
Sales teams use it to reach accounts they already know about but can't contact. Marketing teams use it before a campaign, so a mailing or a call program reaches more of the list.
Ecommerce, retail, healthcare, and finance companies use it to bring old customer records back into use. Nonprofits use it to reconnect with past donors whose details went stale.
Appending to millions of records, in batches
Large files run in weekly batches, and each batch is matched, checked, and signed off before the next one starts. You can load each batch as it arrives, so your teams start using the first records while the rest are still in progress.
Data append matching and quality checks
Most of the quality in appending comes from the match. A wrong match adds a correct number to the wrong person, which is worse than a blank field.
- We clean and standardize your file before matching, which raises the match rate
- Every appended value records its source and the date it was checked
- Matches below the confidence bar go to a person, not into your file
Questions about data appending services What buyers ask us before an append starts
How is the appended data sourced and maintained?
We agree the sources with you before we start: public records, published business directories, licensed data providers, and data people agreed to share. Each appended value carries its source and check date, so you can audit it later.
What is the average match rate of your data appending services?
It depends on the quality of your file and the fields you need. That's why we append to a sample first and show you the match rate before you commit to the full file.
Will you clean my existing data before appending?
Yes. We merge duplicates, standardize addresses and phone formats, and fix obvious errors first. Clean records match more often, so you get more filled fields for the same file.
How accurate is appended data?
Accuracy depends on the sources and the match. We only append values that pass our checks, and a reviewer decides every match the agents are unsure of. We measure accuracy on a sample of each batch, and the batch owner signs off on it.
How do you price your data append services?
We price per record. The price depends on the fields you need, the size of the file, and the match rate on your sample, so we quote after the sample.
Send us a sample of your list
We'll reply with the match rate on it and the price per record.