koron/masslookup

mass DNS lookup

$ masslookup < ip.txt > name.txt

input format:

1.2.3.4
192.168.0.1
111.112.113.114

output format:

• Found

    {IP} \t FOUND \t {WHITESPACE_SEPARATED_NAMES}
  

• Error:

    {IP} \t ERROR \t {ERROR_MESSAGE}
  

• No entries:

    {IP} \t NOENTRY
  

Usage

  -concurrency int
        concurrency of DNS query (default 500)
  -hideerror
        hide query ERROR
  -hidenoentry
        hide NOENTRY

Configure DNS server

To change DNS server (resolver), you have to change OS specified resolver.

For Linux, please edit /etc/resolv.conf.

• CoreOS
• Ubuntu
• Configure Google PUblic DNS for Linux

For Windows, please configure network adapter's TCP/IP settings.

• Configure Google Public DNS for Windows