I read on another phone lookup that people say this is a dangerous number & people should not answer this number. People are saying that no one is saying anything on the line that called.  This may be one of those scam callers that wants you to speak so they can steal your voice & use it in some way as this is a new scam going around.  Since I don't recognize this number as anyone I know, I have blocked it permanently.  Good rule of thumb is if you don't recognize the number, "Do Not Answer It"....