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FTP | Port 53

This is a fun service

# Basic A query (UDP)
dig @TARGET_IP example.com A

# Force TCP (useful if UDP filtered)
dig +tcp @TARGET_IP example.com A

# Look at response flags (ra: recursion available)
dig @TARGET_IP example.com +noall +answer +comments

Zone transfer (AXFR)​

# Try zone transfer with dig
dig @ns1.TARGET_DOMAIN TARGET_DOMAIN AXFR

# Force TCP
dig +tcp @ns1.TARGET_DOMAIN TARGET_DOMAIN AXFR