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dns-resolver's Introduction

DNS-resolver

A CLI Ruby program which does domain name resolution and prints the lookup chain, until it resolves to an IPv4 address.

learn more about DNS & zone files

demo

Sample Input zone file

RECORD TYPE, SOURCE, DESTINATION
A, ruby-lang.org, 221.186.184.75
A, google.com, 172.217.163.46

CNAME, www.ruby-lang.org, ruby-lang.org
CNAME, mail.google.com, google.com
CNAME, gmail.com, mail.google.com

Output

$ ruby lookup.rb google.com
google.com => 172.217.163.46

$ ruby lookup.rb gmail.com
gmail.com => mail.google.com => google.com => 172.217.163.46

$ ruby lookup.rb gmil.com
gmil.com => Error: record not found for gmil.com

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