Server entries have changed: If an entry on the web server is changed or a new entry is added, you might need to flush the DNS cache immediately to prevent interruptions.Resolve page-loading problems: Starting fresh is the best way of addressing situations when some websites won’t load, or web pages load slowly.Flushing your DNS cache minimizes the risk of DNS hijacking, which is a significant problem in China. Prevent DNS hijacking: This practice subverts the resolution of DNS queries, which can be achieved via malware or by modifying the behavior of a trusted DNS server to the point it no longer complies with Internet standards.Here are a few common scenarios in which clearing the DNS cache may help. When and why should you clear DNS caches? It is very important to stress that clearing the DNS cache won’t remove your browsing history, website data, saved passwords, or any other temporary Internet files that get saved to your device to speed up web page load times. Therefore, clearing the DNS cache so it doesn’t hold invalid items is usually the best way to solve any such woes. A corrupt DNS cache may lead to intermittent problems with loading websites. A DNS cache is maintained by the operating system, but some browsers may keep their own DNS cache.Īll caches can become corrupt over time, and that’s especially true with DNS caches.
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In other words, a DNS cache is just a memory of recent DNS lookups that your computer can quickly refer to when it’s trying to figure out how to load a website. Rather than having to memorize numerical IP addresses for your favorite websites, your device can tap into a cached table of recent DNS lookups to know how to load a web resource. The system assigns domain names to each of the devices while translating human-readable domain names like to the numerical IP addresses that identify services and devices with the underlying network protocols.Ī DNS cache, also known as a DNS resolver cache, is a temporary database, a phone book of sorts, which helps speed up DNS lookups by storing records of all the recent network requests. In short, DNS is a decentralized naming system for devices connected to the Internet or a private network (VPN). What is a DNS cache?ĭNS, or “Domain Name System,” has been the staple of the Internet’s functionality since 1985. If you cannot connect to some websites, a web page won’t load at all, or your network slows down randomly for no apparent reason, chances are your device’s DNS cache has become corrupted due to technical glitches, administrative accidents, or other reasons.Īside from other reasons, the DNS cache may become polluted when unauthorized domain names or IP addresses are inserted via a network attack or malware/virus.īut worry not, resetting the DNS cache should help resolve those problems.
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