Look up the business name that a US phone number shows on caller ID.
Enter a US phone number to see the caller ID name on record for it. It is free, with no signup.
Works for US numbers. Enter 10 digits, such as (206) 555-0147.
Free & rate-limited. No signup required to try.
A business phone number lookup finds the name linked to a phone number. 1Lookup's free business number lookup reads the caller ID name on record for a US number, shows whether it ends in LLC, Inc, Corp or Ltd, and gives the city and state. It does not say whether the number belongs to a business.
- Free, no signup
- US numbers
- Never calls the number
- Says what it cannot show
You can look up a business number in under a minute.
Enter the number.
Type the ten digits of a US number, such as (206) 555-0147, with or without the +1.
Read the caller ID name.
The result shows the name carriers can show on caller ID, or says that none is on record.
Check the ending.
A name that ends in LLC, Inc, Corp or Ltd is a company name on its face. A name without an ending can still belong to a business.
Go further for the street address.
A free account shows the street address on record, and the state's business registry holds the registered company.
Need this at scale? Reverse Phone Lookup API
Look up the name and address on record for whole phone lists through the API or bulk CSV.
A business phone number lookup works from the caller ID name, because that is the name linked to the number.
A phone number does not carry its owner's name. When a call arrives, the called person's carrier looks the number up in a caller ID name database, known as CNAM, and shows the name that comes back. The FCC describes this in its caller ID report to Congress (DA 11-1089). That database entry is the closest thing to a business name that a phone number has, and it is what this lookup reads.
The lookup adds one check on top of the name: whether it ends in a legal ending such as LLC, Inc, Corp or Ltd. State law puts those words in a company's registered name. Delaware, for one, requires an LLC's name to contain the words Limited Liability Company or the abbreviation L.L.C. or the designation LLC, and requires a corporation's name to contain a word such as corporation, incorporated or limited. A name with an ending is a company name on its face.
A name without an ending proves nothing either way. A caller ID name holds up to 15 characters, so a long business name is cut short and its ending is often the part that goes. Many mobile numbers carry no caller ID name at all, and the record does not say whether a number belongs to a business or a person, so this page never claims to.
The SBA's Office of Advocacy counts 29,811,495 small businesses with no employees among the 36,207,130 in the US, which is 82.3% of them. A business number is often one person's line, and that is why the lookup reports the name it finds and leaves the judgment to you.
The reverse phone lookup API returns the same name record for whole lists.
When the lookup has to run inside your own software or across thousands of numbers, the API returns the name, address and line type on record for each one. A lookup that finds a name costs 10 credits, and one that finds nothing costs none. See the reverse phone lookup API. To read only the name a number shows on caller ID, use our free CNAM lookup. To find the person behind a number, use our free reverse phone lookup. To check whether a number is reported as spam, use our free phone number fraud checker. To find a trucking company by its USDOT number, use our free USDOT number lookup.
A business number lookup returns these fields, and each one answers a different question.
This is an invented result for a made-up number, laid out the way a lookup comes back. The first four fields are free on this page, and a free account opens the street address.
- Caller ID nameNORTH PEAK LLC
- Legal ending in the nameLLC
- CitySeattle
- StateWA
Opens with a free trial
- Full street address412 Pine Ridge Way
Caller ID name
The name carriers can show on caller ID for this number. It holds up to 15 characters, so a long name arrives cut short.
Legal ending in the name
The ending the lookup found in the name: LLC, Inc, Corp or Ltd. It reads None shown when the name has none, which does not rule out a business.
City
The city on the record for the number.
State
The state on the record for the number.
Full street address
The street address and ZIP code on record for the number, which a free account opens.
The lookup reads the caller ID name and checks its ending in three steps.
You enter a US number.
Type or paste ten digits, with or without +1. A number outside the US is told so, because there is no US caller ID name record to check.
We read the caller ID name on record.
1Lookup reads the name record for the number. Nothing is dialed, and a number with no record is reported as having none.
You read the name and its ending.
The result shows the name, whether it ends in LLC, Inc, Corp or Ltd, and the city and state. A free account opens the street address on record.
A business number lookup reads the caller ID name, then checks its ending.
This is the path one lookup takes. The name and its ending are what a number's record can answer, and the registered company sits in a different place.
- You enter the numberTen digits, read in the US numbering plan.
- Its name record is readThe caller ID name on record for the number, if there is one.
- Its ending is checkedLLC, Inc, Corp and Ltd are picked out of the name, with or without periods.
- You read the resultThe name, its ending and the city and state. The street address and the registered company are one step further.
Most US businesses have no employees, so a business phone number is often one person's line.
The SBA's Office of Advocacy counts 36,207,130 small businesses in the US, which it defines as independent businesses with fewer than 500 employees. 82.3% of them have no paid employees. The Office counts another 21,041 large businesses.
| Type of business | Firms | Share of small businesses |
|---|---|---|
| Small businesses with no employees | 29,811,495 | 82.3% |
| Small businesses with employees | 6,395,635 | 17.7% |
| Large businesses | 21,041 | Not a small business |
Source: SBA Office of Advocacy, Frequently Asked Questions About Small Business, February 2026.
Just over half of new employer establishments close within five years.
The SBA's Office of Advocacy followed new employer establishments from 1994 to 2022. The first column is the average share that survived each number of years, and the last is what is left over, which closed. A number can outlive the business that held it.
| Years after opening | Still open | Closed |
|---|---|---|
| 2 years | 67.7% | 32.3% |
| 5 years | 49.2% | 50.8% |
| 10 years | 33.9% | 66.1% |
| 15 years | 25.5% | 74.5% |
Source: SBA Office of Advocacy, Frequently Asked Questions About Small Business, February 2026.
In 2023 about 1.3 million business establishments opened and about 1.2 million closed.
The same SBA report counts the churn in a single year. Every new establishment can bring new phone numbers, and every closure can leave old ones behind.
| Measure, 2023 | Establishments |
|---|---|
| Opened for the first time | 1.3 million |
| Closed | about 1.2 million |
Source: SBA Office of Advocacy, Frequently Asked Questions About Small Business, February 2026.
State law puts a legal ending in a company's name, and the lookup reads four of them.
These are the endings the lookup picks out of a caller ID name, and the Delaware rules they come from: title 6, section 18-102 for an LLC and title 8, section 102 for a corporation, which is the one linked below. Delaware is one state, and a company formed in another state follows that state's law.
| Ending the lookup reads | Also written as | Where the rule is |
|---|---|---|
| LLC | L.L.C., Limited Liability Company | Delaware Code title 6, section 18-102(1): an LLC's name must contain Limited Liability Company, L.L.C. or LLC |
| Inc | Incorporated | Delaware Code title 8, section 102(a)(1): a corporation's name must contain a word such as incorporated |
| Corp | Corporation | Delaware Code title 8, section 102(a)(1): a corporation's name must contain a word such as corporation |
| Ltd | Limited | Delaware Code title 8, section 102(a)(1): a corporation's name must contain a word such as limited |
Source: Delaware Code title 8, chapter 1, subchapter I, section 102.
A caller ID name holds 15 characters, so a long business name loses its ending.
The caller ID name is a database entry that the called person's carrier looks up for each call, and it holds up to 15 characters under industry convention. This table cuts six invented business names at 15 characters, spaces included, to show what is left. A real record may abbreviate a name instead of cutting it.
| Name as registered | Characters | What 15 characters leave |
|---|---|---|
| North Peak LLC | 14 | NORTH PEAK LLC |
| Oak Lane Cafe LLC | 17 | OAK LANE CAFE L |
| Redwood Plumbing LLC | 20 | REDWOOD PLUMBIN |
| Delta Tax Services Corp | 23 | DELTA TAX SERVI |
| Harbor Street Dental Group LLC | 30 | HARBOR STREET D |
| Bright Path Learning Center Inc | 31 | BRIGHT PATH LEA |
A phone number says little about a business, and each fact about one lives in its own record.
This is where the answer to each common question sits, and which free 1Lookup tool covers it.
| Question | Where the answer lives | Free tool |
|---|---|---|
| What name shows on caller ID for this number? | The caller ID name database | This business phone number lookup |
| Who is the person behind a US number? | Name and address records | Reverse phone lookup |
| Is the number mobile, landline or VoIP? | The number's carrier record | VoIP checker |
| Is the number reported as spam? | Spam and robocall reputation records | Phone number fraud checker |
| Is a trucking company's USDOT number active? | The FMCSA registry | USDOT number lookup |
| Is a US healthcare provider registered? | The NPPES registry | NPI lookup |
| Is a company registered in a state? | That state's business registry | None, use the state's own search |
A business phone number lookup that finds a name costs 10 credits, about $49.50 per 1,000 lookups on Starter and $19.99 on Enterprise.
These are the monthly plans on the pricing page. A lookup that finds nothing costs nothing, every plan starts with a 7-day free trial, and the same credits pay for every other 1Lookup check.
| Plan | About per 1,000 lookups | Monthly price | Business number lookups included |
|---|---|---|---|
| Starter | $49.50 | $99 | 2,000 |
| Growth | $35.20 | $299 | 8,500 |
| Professional | $32.00 | $799 | 25,000 |
| Enterprise | $19.99 | $1,999 | 100,000 |
You can look up the names behind a whole list of US numbers with one CSV file.
The free tool checks one number at a time. With a 1Lookup account you upload a CSV file, pick the column that holds the numbers and download the same file back with the name and address on record filled in on every row. These are 7 of the columns it adds, with invented numbers.
| phone | Matched | Company Name | Address Line 1 | City | State | ZIP | Phone Type |
|---|---|---|---|---|---|---|---|
| (206) 555-0147 | Yes | NORTH PEAK LLC | 412 Pine Ridge Way | Seattle | WA | 98101 | Landline |
| (312) 555-0126 | Yes | OAK LANE CAFE | 88 Example Avenue | Chicago | IL | 60601 | Landline |
| (615) 555-0179 | No |
- 10 credits for a number that matches, about 5 cents on Starter, and nothing for a row that matches nothing.
- Up to 2 million rows in one CSV file.
- Up to 1,000 API requests a minute on every account.
The reverse phone lookup API returns the same name record as JSON from one request.
Send the number in international format (+1 and ten digits) to the reverse phone lookup endpoint with your API key. A lookup that finds a name costs 10 credits, one that finds nothing costs none, and every account can send up to 1,000 requests a minute. The name is in classification.company_name, and the address is under insights.reverse_lookup_result.address.
curl -X POST https://app.1lookup.io/api/v1/reverse-phone-lookup \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"phone_number": "+12065550147"}'import requests
response = requests.post(
"https://app.1lookup.io/api/v1/reverse-phone-lookup",
headers={"Authorization": "Bearer YOUR_API_KEY"},
json={"phone_number": "+12065550147"},
)
data = response.json()["data"]
print(data["classification"]["company_name"])const response = await fetch('https://app.1lookup.io/api/v1/reverse-phone-lookup', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({ phone_number: '+12065550147' })
})
const { data } = await response.json()
console.log(data.classification.company_name)Response
{
"success": true,
"data": {
"request": { "type": "reverse_phone_lookup", "input": "+12065550147" },
"classification": {
"matched": true,
"company_name": "NORTH PEAK LLC",
"phone_type": "Landline",
"lookup_type": "reverse_phone",
"coverage_supported": true,
"coverage_region": "US"
},
"insights": {
"reverse_lookup_result": {
"matched": true,
"company_name": "NORTH PEAK LLC",
"address": { "line1": "412 Pine Ridge Way", "city": "Seattle", "state": "WA", "zip": "98101" }
}
},
"metadata": { "credits_used": 10, "credits_remaining": 9990 }
}
}To run the same lookup from your own software or a CRM, see our reverse phone lookup API.
It shows the name as the record holds it.
The name is the caller ID record itself, not a guess made from the number's area code or prefix.
It reads the legal ending for you.
LLC, Inc, Incorporated, Corp, Corporation, Ltd and Limited are picked out of the name, including when they are written with periods, such as L.L.C.
It never calls or texts the number.
The lookup reads records, so the number's owner is not contacted and does not know it was looked up.
It says plainly when no name is on record.
A missing name is reported as missing, with a note that some working lines have none, so a blank is not read as a warning.
Who uses this tool
Sales teams use it to check a lead's number before a call.
A caller ID name that matches the company a lead named is one more sign the number is real, and a number with no name is a reason to look a little closer.
Support teams use it to see who a missed call was from.
Before returning a call from a number the system does not know, a team can see the name on record for it.
Finance teams use it to check a vendor's number.
An invoice carries a phone number. The name on record for it can be compared with the name on the invoice before a payment goes out.
Marketers use it to sort company names out of a list.
The legal ending picks out the names that are companies. Names without an ending still need a look, because a name can belong to a business without one.
Frequently asked questions
What is a business phone number lookup?
It finds the name linked to a phone number. For a US number, the name comes from the caller ID name record that carriers read when a call arrives, which is the closest thing to a business name that a number has.
Can I find a business by its phone number for free?
In part. This free tool shows the caller ID name on record, whether it ends in a legal ending such as LLC, and the city and state. The street address on record needs a free account, and the registered company is held by the state's business registry.
Does the lookup tell me whether a number belongs to a business?
Not by itself. The record holds a name, not a business flag. A name that ends in LLC, Inc, Corp or Ltd is a company name on its face, and a name without an ending can still belong to a business.
What does a legal ending in a name mean?
State law requires a company's name to show what kind of company it is. Delaware Code title 6, section 18-102, requires an LLC's name to contain Limited Liability Company, L.L.C. or LLC, and title 8, section 102, requires a corporation's name to contain a word such as corporation, incorporated or limited. Each state sets the rules for companies formed there.
Why does the name on caller ID look cut short?
A caller ID name holds up to 15 characters under industry convention, spaces included, so a longer business name is cut. The ending is often the part that is lost, which is why a name with no ending proves nothing.
Why does a business number show no caller ID name?
A name shows only when the number has an entry in a caller ID name database. Many mobile numbers have none, and some landlines and business lines have none either. The name also depends on the called person's carrier choosing to look it up.
Can the caller ID name be wrong or faked?
Yes. The FCC says the name is only as accurate as its database, and that bad actors can link numbers they control to misleading names, such as a bank's name. Treat the name as one clue and confirm a business through a number or website you know is real.
How is this different from a reverse phone lookup?
This page is built around the caller ID name and its legal ending, which is what a business number carries. The reverse phone lookup is built around the person behind a number. Both read the same kind of record for a US number.
Can I look up a toll-free business number?
Toll-free numbers are held through a registry that carrier records do not cover, so this lookup cannot name their holder. Use our toll-free number lookup to confirm the type and date the code.
Does the lookup work for Canadian or other non-US numbers?
No. It reads US caller ID name records only, and a Canadian or other non-US number is told so. Use our carrier lookup for the carrier and line type of a number in any country.
Does the lookup call the number or tell its owner?
No. It reads records only, so nothing is dialed or sent, and the owner is not told anyone looked.
How current is the name on record?
It is as current as the database it comes from. Businesses open and close often: the SBA's Office of Advocacy reports that 49.2% of new employer establishments from 1994 to 2022 were still open after five years. A number can outlive the business that had it, so compare the name with the one you expect.
How much does a business phone number lookup cost per number?
A business phone number lookup that finds a name costs 10 credits in the API or a CSV upload, and one that finds nothing costs nothing. That is about $49.50 per 1,000 on the Starter plan, $35.20 on Growth, $32.00 on Professional and $19.99 on Enterprise. The free tool on this page checks one number at a time with no signup, and every plan starts with a 7-day free trial.
Is there an API that looks up business names by phone number?
Yes. The 1Lookup reverse phone lookup API takes a US number and returns the name on record with the city, state and street address, one number at a time in real time or for whole lists from a CSV upload, starting with a 7-day free trial.
Is this business phone number lookup really free?
Yes. The tool is free to use online and rate-limited for fair access, and it needs no signup. To see the street address on record, or to look up numbers in bulk, sign up for a 7-day free trial, then use the API as you scale.
These pages answer the question that comes after a business number lookup.
- CNAM lookupThe caller ID name a number shows, and what it does and does not prove.
- Reverse phone lookupThe likely owner and location behind a US number.
- Phone number fraud checkerWhether a US or Canadian number is reported as spam or flagged as a robocaller.
- VoIP checkerWhether a number is mobile, landline or VoIP, with its validity.
The first three digits of a US number tell you where it was assigned.
Every area code has its own page with the places it covers, the local time there, and what to do when a call from it looks spoofed. These are the codes people look up most.
- 213Los Angeles
- 646New York City
- 917New York City
- 202Washington
- 404Atlanta
- 702Las Vegas
- 786Miami
- 415San Francisco
- 206Seattle
- 954Fort Lauderdale
- 323Los Angeles
- 929New York City
Area code 213, downtown Los Angeles, also has a page for each of its 786 prefixes, with the company NANPA lists as the holder.
New area codes catch people out, because a number from one looks unfamiliar even when it is local. These are the newest working codes.
- 465New York, since Jun 2026
- 483Alabama, since Feb 2026
- 471Mississippi, since Jan 2026
- 679Michigan, since Nov 2025
- 457Louisiana, since Sep 2025
- 729Tennessee, since Sep 2025