I've received at least three calls from this number over the past month on my home phone.  The number shows registered to a Justin Harold Terry on Collins Blvd in Ogden, UT, but it's possible that the number has been spoofed.  Since whoever calls never leaves a message, I suspect it's a phishing operation  trying to scam people into revealing their personal info.  If you're a legitimate caller then leave a message!  I hardly ever answer my home phone anymore because of calls like these.
Protect yourself against scammers and get an answering machine or voice mail.

Update to my previous post:  801-605-1816 is definitely a scam artist phishing for personal information.  I read a post on another site earlier today stating that the person who called claimed to be an IRS representative.  THIS IS A SCAM!  The IRS does not call you unless you contact them by telephone FIRST.  If you owe the IRS money or are delinquent in filing your returns, the IRS will send you a letter--they will not call.  I got another hang up call (no message left) from this number less than 12 hours ago, which makes at least four calls this month from 801-605-1816.  If you get  a call from this number, do not answer--IT'S A SCAM designed to trick people into revealing their personal information!

Received a call asking me to return call to a local number 559-459-5473, a Mrs. Guttierrez telling me they are calling about a form I sent to their office and they have a question about my form.  However, they identify they will be in the office until 3:00 p.m. Pacific time.  Interesting if they are in the same time zone as me?  I have not sent any forms and they did not identify what kind of form.

(801) 605-1816 this number is a SCAM. Some one called my phone left a message saying calling from IRS, gave a different number to call at the end of the day. The above posting is TRUE that IRS does not call your number they issue a letter to address on file.

This number iIS an IRS line. I know someone that works for the IRS and they just called me from this number.