Thanks for doing the legwork on this.  Even tho I won't answer nor return unrecognized numbers like these, I *do* appreciate knowing its origin in the unlikely-event that the caller may be someone I actually want to speak to.  I know people all over the world and tho I provide a certain few my cell number for texting only, I have 3 landline numbers and have ignored calls from someone I *had* given my number to a long time ago.  I also run a business (one of the numbers) and I never recognize new callers who are new to my company.  If they don't leave a message they don't get a call back.