dnstracer
DNS delegation tracing tool
TLDR
Trace DNS resolution path
$ dnstracer [www.example.com]
Start with specific DNS server$ dnstracer -s [dns.example.org] [www.example.com]
Query IPv4 servers only$ dnstracer -4 [www.example.com]
Retry failed requests 5 times$ dnstracer -r [5] [www.example.com]
Display all steps$ dnstracer -v [www.example.com]
Display overview of answers$ dnstracer -o [www.example.com]
SYNOPSIS
dnstracer [options] name
DESCRIPTION
dnstracer determines where a DNS server gets its information from by tracing the DNS resolution path from root servers down to the authoritative nameserver.
Useful for debugging DNS issues and understanding DNS delegation.
PARAMETERS
-s server
Start with specified DNS server-4
Only query IPv4 servers-6
Only query IPv6 servers-r count
Number of retries on failure-v
Verbose output-o
Overview of all received answers
CAVEATS
Requires network access to DNS servers. Tracing may take time for complex delegations. Some DNS servers may block tracing queries.