Caller ID name (CNAM)

CNAM (Caller ID Name, also written Calling Name) is the name displayed next to an incoming phone number in the United States and Canada, for example "ACME PHARMACY" or a person's name. It is usually not sent by the caller. The terminating carrier looks up the calling number in a CNAM database at the moment the call arrives and shows the stored name, typically limited to 15 characters.

#How does CNAM work?

When a call reaches the called party's carrier, it carries the calling number. If the subscriber has caller name display, the carrier sends a query, often called a "CNAM dip", to a database that maps numbers to names. The provider that issued the number registers the name in such a database. The carrier displays the result, or a generic label such as "WIRELESS CALLER" when no name is stored.

Several databases exist, and not all are kept in sync, so the same number can show different names on different networks. Mobile numbers often have no name at all.

#Why is CNAM often wrong?

• Stale records. Numbers get reassigned, businesses rename, and old names can stay in caches.
• No record. Many mobile and VoIP numbers never had a name registered.
• Spoofing. A caller who spoofs a number gets that number's stored name, which makes the call look more trustworthy.

US rules (47 CFR 64.1604) prohibit transmitting misleading or inaccurate caller identification information with intent to defraud, cause harm or wrongfully obtain anything of value. The definition of caller identification information in 47 CFR 64.1600 covers the number and "other information regarding the origination" of a call.

#How does CNAM relate to STIR/SHAKEN?

STIR/SHAKEN signs the calling number, not the name. A separate IETF standard, RFC 9795 (July 2025), extends signed caller information with "rich call data" such as a display name and logo, so that a verified brand name can travel with the call. Adoption of these branded calling services is still developing.

#What should a business do about CNAM?

• For outbound calls: register an accurate business name for the numbers you call from, and check how it displays on major networks. Combined with STIR/SHAKEN attestation, this helps people recognise legitimate calls.
• For inbound calls: don't treat a displayed name as proof of identity. Screen calls with signals about the number itself.

#Does MobileValidate offer CNAM or name lookups?

No. MobileValidate doesn't return names for phone numbers, and it doesn't offer reverse lookups from a number to a name, photo or social profile. That is a deliberate privacy decision, not a missing feature.

What MobileValidate does return is information about the number: the current carrier and line type through the US and Canada carrier lookup, and, where enabled, spam reputation (limited access, US, CA and DE numbers). See call-center screening for how to route inbound calls with these signals, and our privacy checklist for handling phone data responsibly.