The most well-known type of DNS query is the one used to identify the IP address or addresses for a given domain name: the type A query. Conversely, a reverse DNS lookup is performed to identify the domain name or names associated with a given IP address. A reverse DNS domain is built from the IP address. This process involves reversing the bytes of the IPv4 address or nibbles of an IPv6 address and appending a special domain within the .arpa TLD (in-addr.arpa for IPv4 addresses and ip6.arpa for IPv6 addresses).
learnt that we can move down many lines at once.。line 下載对此有专业解读
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从桌面端来看，Linux 本身的关注度确实在走高，一些科技媒体编辑已经开始尝试在日常工作中用 Linux 取代 Windows，尽管实际体验“成功程度不一”。