When an unknown number appears on your account call history, it can indeed be a concern. We're happy to help!
The number that was displayed may be from another carrier that has blocked the number to prevent it being reported as spam caller by AT&T. A majority of companies will have private numbers, but it will appear differently on your device caller ID as a normal call.
We hope this information answers your inquiry, and have an great day!
Dwight, AT&T Community Specialist
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*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.