關於「Ubuntu check DNS」標籤，搜尋引擎有相關的訊息討論：

Command line to list DNS servers used by my system - Ask Ubuntuaskubuntu.com › questions › command-line-to-list-dns-ser...Ubuntu 18.04 Server - how to check DNS IP server setting being usedstackoverflow.com › questions › ubuntu-18-04-server-ho...What DNS servers am I using? - U