I’ve noticed that a few people are googling ‘authority labs penalised.’ Evidently some are concerned that checking your rankings with us will penalize your positioning within search results. I guarantee that it will not.
IP addresses will get penalized by search engines when they detect an abnormal amount of searches coming from a single IP. When this happens Google, for instance, throws up a CAPTCHA to make sure that humans are actually using their service and not automated rank checking software like WebPosition. A lot of the time poor quality rank checking software can poll search engines too often. They don’t like this because it takes up valuable bandwidth.