When using Google Analytics and displaying the network domain of visitors to our web site we see cases where we have been able to confirm the visitor has no relationship to the network domain being shown. For example, they work for ABC Manufacturing whose domain is "abcmanufacturing.com", but when they visit our web site their network domain shows up in Google's data as "xyzretail.com". We've been able to confirm several cases like this where the network domain being shown in the analytics data is registered to another company, sometimes not even in the same metropolitan area or state as our customer.
Does anyone know how and why this occurs? Thanks.