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Skip Tracing API

Skip tracing finds the phone numberbehind a name and address.

Send a name and US address, one at a time, as a CSV or through the API. Get back a phone number with its line type and a Do Not Call flag, then check and scrub it in the same account.

Start a 7-day free trialView API Docs

About $0.05

a record on Starter

CSV or API

for whole lists

DNC flag

on every number

The 7-day free trial includes about 100 skip traces. No payment today.

1Lookup skip trace API turning a name and US address into a phone number with its line type and a Do Not Call flag

A skip trace turns a name and address into a number you can call.

This is what one record looks like going in and coming back.

You send

Name
Jordan Avery
Street
418 Larkspur Lane
City and ZIP
Springfield, IL 62704

You get back

Phone
(217) 555-0142
Line type
Mobile
Do Not Call
Not listed

Sample record

One account traces the contact, checks the number and scrubs it.

The same credits pay for all three steps, so a list goes from names to numbers you can dial in one place.

1

Skip trace the contact

10 credits

Send a first and last name, street address, city and ZIP. Get back a phone number with its line type (mobile, landline or VoIP) and a Do Not Call flag.

2

Check the number

1 credit

Phone validation confirms the line type, the carrier and whether the number is active, so dead numbers come off the list before anyone dials.

How it works
3

Scrub it before you call

10 credits, nothing when not found

A phone scrub returns Do Not Call status and flags known litigators, serial complainers and attorneys.

How it works

This is what skip tracing costs on 1Lookup.

A skip trace uses 10 credits per match, and a search that finds no one costs nothing. Plans start at $99 a month, and unused credits roll over for 3 months.

  • 500 records
    5,000 credits on Starter, $99 a month
    About $0.05 a record
  • 2,000 records
    20,000 credits on Starter, $99 a month
    About $0.05 a record
  • 10,000 records
    100,000 credits on Professional, $799 a month
    About $0.03 a record

Try it first: the 7-day free trial includes about 100 skip traces, with no payment today.

Upload a whole list as a CSV, or send it through the API.

In the dashboard, upload first name, last name, address, city and ZIP for each contact and download the results as a CSV. Or call one endpoint per record.

Bulk skip tracing

  • Upload a CSV of contacts in the dashboard
  • Start from our template, or map your own columns
  • Each row uses the same 5 fields as the API
  • Results download as a CSV
POST /api/v1/phone-append
// Skip trace one contact
const response = await fetch('https://app.1lookup.io/api/v1/phone-append', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    input: {
      firstName: 'Jordan',
      lastName: 'Avery',
      address: '418 Larkspur Lane',
      city: 'Springfield',
      zip: '62704'
    }
  })
})

// Response
{
  "success": true,
  "data": {
    "request": { "type": "phone_append", "processing_time_ms": 546 },
    "metadata": { "credits_used": 10, "credits_remaining": 9961, "cache_hit": false },
    "classification": {
      "matched": true,
      "phone": "2175550142",
      "phoneTypeLabel": "MOBILE",
      "do_not_call": false,
      "append_type": "phone"
    }
  }
}

Teams skip trace to reach people whose details are out of date.

Real estate investors

Reach the owners on a seller list: absentee owners, probate and tax-delinquent properties, or homes you found driving for dollars.

Collections and recovery

Find a current number for an account holder who moved, using the name and last address on file.

Sales and lead generation

Fill in the missing phone number on leads that arrived with only a name and a mailing address.

Legal and process serving

Reach a party or a witness when the only details you have are a name and an old address.

See how 1Lookup ranks against 9 other skip tracing services.What each one returns, which number checks come with it, and how it bills.

These are the questions people ask most about skip tracing.

Skip tracing finds a way to reach a person from what you already know about them, usually a name and a last known address. 1Lookup's skip trace takes a first and last name, street address, city and ZIP, and returns a phone number with its line type (mobile, landline or VoIP) and a Do Not Call flag.

Try skip tracing free for 7 days.

The free trial includes about 100 skip traces on Starter, plus every other check in the account. No payment today.

Start a 7-day free trialSee pricing