DNS Traversal Tool (troubleshoot DNS consistency)
Usage:
  curl lookupr.com/q/[domain]/[type]
Help:
  curl lookupr.com
Examples:
  curl lookupr.com/q/lookupr.com
  curl lookupr.com/q/lookupr.com/aaaa
  curl lookupr.com/q/35.223.54.125
Notes:
  Use in browser or on command line with curl.
  Queries A record by default.
  Only supports TCP--DNS server without TCP support will timeout.
  Chooses random root and tld--no traversal at root and tld.
  Leaves result analysis to you.
  Supports IPv6 for site and queries.
  No CNAME following--traverse CNAME separately.
Motivation:
  Some ISPs confound debugging by intercepting DNS (UDP and TCP) and replying from their own servers. This is detectable with a dig +norecurse and finding the rd bit. Dig +trace provides a top-down query, but no traversal, and is also confounded by upstream interception. There are a number of sites that intend to provide DNS traversal, but they are generally broken and/or slow.
Background:
  The Domain Name System is a fantastic distributed database and critical piece of internet infrastructure. DNS resolution preceeds nearly all internet communications by translating a domain name into an IP address. DNS is a multi-level database with various entities managing various segments at various levels, each level providing referrals to the next. Root-servers.org is a great starting point to learn about DNS.