Broken Link-relatedserver Response Codes

Our standalone Link Checker detects the following page problems / HTTP response codes:

404 Page Not Found : the page / resource doesn't exist on the server
400 Bad Request : host server cannot understand the URL on your page
bad host Invalid host name : server with that name doesn't exist or is unreachable
bad url Malformed URL (e.g. a missing bracket, extra slashes, wrong protocol etc)
bad code Invalid HTTP response code : server response violates HTTP spec
empty Host server returns "empty" responses with no content and no response code
timeout Timeout : HTTP requests constantly timed out during the link check
reset Host server drops connections.