In the past, Apache performed these reverse lookups by default, but this behavior has been changed.

过去，Apache在缺省情况下会执行这些反向查找，但现在这种行为已经有了改变。

youdao

Finally, if nothing works, you should try a people search service like Pipl and Spokeo - both services let you perform reverse email lookups but Spokeo has a more comprehensive database than Pipl.

最后，如果上面的方法都没有效果，您应该试试人物搜索服务，如Pipl与Spokeo——两者都可以进行反向电邮查询，但Spokeo的数据库较为详尽。

youdao

For 'reverse' lookups, that is, when you want to resolve an IP address to a name, you should set up an additional zone.

对于“反向”查找，也就是当您希望将IP地址解析到名称的时候，您应该设置一个附加的区域。

youdao