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While looking some old dnsnameserver posts, just noticed the following points.

Default nameserver for

  • Ubuntu desktop 12.04 was 127.0.0.1

  • Ubuntu desktop 14.04 was 127.0.1.1

  • Ubuntu desktop 17.10 is 127.0.0.53

Is there any specific reason to change the default nameserver to 127.0.0.53 by default ? Or is it just a random number(53) ?

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It's just an ordinary loopback IPv4 address... All IPv4 addresses begining with 127 are loopback addresses.

Ubuntu 17.10 uses systemd-resolved as the default local caching name resolver; using a rarely used loopback IPv4 address enables it to coexist with other local caching resolvers. As far as I know no other well-known application uses 127.0.0.53 by default.

  • Thanks for the answer. I read somewhere that dnsmasq server in 12.04 is not cache server due to security issues. So dnsmasq in 17.10 is caching ? I have little knowledge in this area. probably i need to try to understand more to avoid such doubts i think. Anyway thanks again. – Rooney Dec 14 '17 at 12:26
  • @Rooney: 17.10 uses systemd-resoved. Try systemd-resolve --status. – AlexP Dec 14 '17 at 13:09

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