![]() ![]() 2013 User Agent BlacklistĪ few months ago, pentag0 posted an effective user-agent blacklist that I’ve went ahead and incorporated into the 2013 User Agent Blacklist. Fortunately, the 2013 UA Blacklist protects your site against hundreds of nefarious bots, thereby fostering maximum performance for the search engines. If Google visits while bad bots are hitting your site, your site’s SEO could suffer. A single malicious bot can make hundreds and thousands of requests in a very short period of time while scanning and probing for vulnerabilities. Even if your site looks fine on the surface, without proper protection bad bots can gobble your bandwidth and leech your server resources. If your site is plagued with resource-devouring, bandwidth-wasting bots, it’s performance is probably not as good as it should be. Search engines such as Google are placing more weight on speedy, fast-loading websites. Blocked user-agents are denied access to your site, increasing efficiency and providing safety for your visitors. While analyzing malicious behavior, evil bots are identified and added to the UA Blacklist. Obsessive daily log monitoring reveals bad bots scanning for exploits, spamming resources, and wasting bandwidth. The 2013 UA Blacklist has been carefully constructed based on rigorous server-log analyses. Implementing a user-agent blacklist is a free and simple way to filter out a large percentage of bad traffic while freeing up valuable server resources for legitimate visitors. Fortunately, it doesn’t matter if it’s the “real” httrack harassing your site or something pretending to be httrack - you don’t want anything to do it. ![]() For example, the notorious “httrack” user agent has been widely blocked since at least 2007, yet it continues to plague sites to this day. Although it’s trivial to spoof any user agent, many bad requests continue to report user-agent strings that are known to be associated with malicious activity. ![]() Compared to blocking threats by IP, blocking by user-agent is more effective as a general security strategy. The 2013 User Agent Blacklist blocks hundreds of the worst bots while ensuring open-access for normal traffic, major search engines (Google, Bing, et al), good browsers (Chrome, Firefox, Opera, et al), and everyone else. ![]()
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