I've just declined a link into my real estate directory for alexshay.com because the site was down. I got a reply stating that the site is indeed active and successful for the site owner. So, I dug around and found that the google cache was good and if I viewed through a proxy server I can see it. Server header checks show everything is ok. I've encountered another north american site that was so annoyed by spamming from the apnic region that they just blocked the IP range altogether. Is there a handy way to identify if this is the case?