Glossary
What is CNAM?
CNAM (Caller ID Name) is the short name, up to 15 characters, that can appear next to a phone number on caller ID in the US. It is not sent with the call: the receiving carrier looks it up in a CNAM database, which is why it is often blank or out of date.
The terms behind CNAM
| CNAM | Caller ID Name (Calling Name). The short name, up to 15 characters, that can appear next to a US phone number on a caller ID display. |
| CNAM database | A database that stores the name record for phone numbers. There is no single national CNAM database; several providers run their own and share records. |
| CNAM dip | The lookup the receiving carrier makes to a CNAM database when a call arrives, to find the name to display. Carriers usually pay a small fee per dip. |
| CNAM registration | Setting or updating the name tied to your number, usually through the carrier or provider that owns the number. |
| Caller ID number | The calling phone number itself, sent with the call. CNAM is the name; the number is sent separately. |
How CNAM works
When you place a call, your network sends the calling number. When the call reaches the other side, the receiving carrier takes that number and queries a CNAM database (a "CNAM dip") for the name on file, then shows it on the screen.
Because each carrier picks its own CNAM source, the same number can show different names, or none, on different phones. Many mobile numbers have no CNAM record, so the phone shows only the number or a city and state.
Why CNAM matters if your team calls leads
- Your outbound name: a blank or wrong caller ID name on your own numbers can make people less likely to pick up. Register it with your provider.
- Not a validity check: a name record says nothing about whether a lead's number is still in service.
- Not a compliance check: CNAM says nothing about Do Not Call status or consent.
CNAM lookup vs. TrueSearch carrier check
| CNAM lookup | TrueSearch | |
|---|---|---|
| Answers | What name is registered to this number for caller ID? | Is this number valid or dead, what line type is it, and which carrier holds it? |
| Line type | No | Mobile, landline, VoIP or toll-free |
| Carrier | No | Carrier name for every number |
| Dead / disconnected numbers | No. A name record can outlive the line | Yes, valid or dead (disconnected / not assigned) |
| Caller name | Yes, when a record exists (often blank for cell numbers) | No |
What TrueSearch returns, and does not
| Valid or dead (disconnected / not assigned) | Yes, every number |
| Line type: mobile, landline, VoIP, toll-free | Yes, every number |
| Carrier name | Yes, every number |
| Bulk upload (CSV or Excel) | Yes, results in about 30 seconds per 1,000 numbers |
| REST API | Yes (JSON, one API key) |
| Claude / ChatGPT / Cursor connector (MCP) | Yes |
| National or state Do Not Call check | No, not yet |
| Known TCPA litigator check | No, not yet |
| FCC Reassigned Numbers Database check | No |
| Starting price | $97/month for 5,000 numbers, 7-day free trial |
| One-off list | $20 per 1,000 numbers, no subscription |
Upload a CSV or Excel file. Every number comes back valid or dead, mobile, landline, VoIP or toll-free, with carrier.
Starter: $97/month for 5,000 numbers after the 7-day trial. Cancel anytime.
Questions
What is CNAM?
CNAM stands for Caller ID Name (also called Calling Name). It is the short text name, up to 15 characters, that a US phone can show next to an incoming number. The calling network sends the number; the receiving carrier looks up the name in a CNAM database and displays it.
Why does caller ID show the wrong name or no name?
Because the name is not sent with the call. The receiving carrier looks it up in a CNAM database, and different carriers use different databases that may hold different or outdated records. Many cell numbers have no CNAM record at all, and some carriers do not display names unless the subscriber enables it.
How do I register or change the CNAM for my business number?
Ask the carrier or provider that owns the number. Most business phone and VoIP providers let you set the caller ID name in their portal or through support. Changes can take days or weeks to show up everywhere, because each CNAM database updates on its own schedule.
Is CNAM the same as a carrier lookup?
No. CNAM returns the name registered for caller ID. A carrier lookup returns who currently holds the number and what kind of line it is (mobile, landline, VoIP or toll-free). They answer different questions and come from different data.
Does TrueSearch do CNAM lookups?
No. TrueSearch for Business does not return caller names. For every number it returns valid or dead, line type and carrier from carrier data, by CSV upload or REST API.
Does TrueSearch check Do Not Call status?
No. TrueSearch checks validity, line type and carrier only. For Do Not Call status, use the National Do Not Call Registry at donotcall.gov.
Related: what is phone line type?, what is an HLR lookup?, free carrier lookup, OpenCNAM alternative and landline checker.
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This guide is general information, not legal advice. TrueSearch for Business checks validity, line type and carrier from licensed telecom data. It does not check the National Do Not Call Registry, state DNC lists or the FCC Reassigned Numbers Database. Not a consumer reporting agency; not for FCRA purposes.