If you have a registered domain name, its a good chance you have received an envelope in the mail from INDS. What INDS does is mails expiration notices to the owners of expiring domains before their domain registrar does. If you fill in the form and send them money you are agreeing to transfer the registrar to them (its in the fine print), from who you registered it with. You would still own the domain, but the registrar will change. The mailing looks very official and prompts many emails and phone calls wanting to know if this is something that needs to be done. You should simply discard the mailing and wait for the actual registrar to contact you regarding renewal. Other scams come from Chinese registry services stating that you are in violation and the US Domain Name registrars which looks like official government business.