During login, a host may perform a reverse lookup on the IP address of the source address on the packets it receives.
在登录期间，主机可能会对它收到的数据包的源地址的IP地址执行反向查找。
Reverse DNS lookup is using an Internet IP address to find a domain name.
反向域名系统(DNS)查找是指使用互联网IP地址来查找域名。
Similarly a function is provided to do the reverse lookup - given an IP address, look up the corresponding hostname.
相类似的功能是反向查找——给出IP地址，查找相应的主机名。
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