Reverse DNS Lookup System for Comprehensive Hostname Identification
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Solution Overview
Problem
Conventional reverse DNS lookup methods are inefficient and often block legitimate emails due to network glitches, improper configurations, and unavailability of name servers, failing to reliably identify all hostnames associated with an IP address, which is crucial for diagnostics, security, and preventing spamming.
Innovation Solution
A dual lookup method that downloads zone files from various TLDs, performs reverse DNS on associated IPs, crawls websites, indexes new hostnames, resolves IP addresses, and optionally appends 'www' for comprehensive DNS entry storage and logging, allowing multiple domain names to be returned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional reverse DNS lookup methods are used, then the process is simple, but the system blocks legitimate emails and fails to reliably identify all hostnames due to network glitches and unavailability of name servers
Solution Approach 1:
The patent segments the reverse DNS lookup process into multiple independent components: forward DNS lookup, reverse DNS lookup, and validation logic. By dividing the system into separate modules that can operate independently, the patent improves reliability through redundancy while managing complexity through modular design. The system performs both forward and reverse lookups as separate operations rather than a single monolithic process.
Solution Approach 2:
The patent performs preliminary validation by checking whether the reverse DNS result matches the original forward DNS result before accepting the hostname. This preliminary action filters out unreliable results early in the process, preventing false positives that would block legitimate emails. The validation step is performed before final hostname acceptance, ensuring reliability without requiring complex additional systems.
2Loss of information
If conventional reverse DNS lookup is performed, then the process is quick, but it fails to identify multiple domain names associated with an IP address
Solution Approach 1:
The patent merges forward DNS lookup results with reverse DNS lookup results to create a comprehensive hostname identification system. By combining the information from both lookup directions, the system recovers complete hostname information even when individual lookups fail or return incomplete data. This merging approach prevents information loss while managing time through efficient integration of results.
Solution Approach 2:
The patent implements feedback by using the results of reverse DNS lookup to validate and supplement forward DNS results. The system feeds the reverse lookup information back into the overall hostname identification process, allowing it to correct or complete information that may have been missed in the initial forward lookup. This feedback mechanism ensures complete hostname identification without requiring excessively long processing times.
3Object-affected harmful factors
If reverse DNS lookup is used for spam detection, then spam blocking is effective, but legitimate emails are also blocked due to improper configurations
Solution Approach 1:
The patent performs preliminary validation by checking whether the reverse DNS result matches the original forward DNS result before using the information for spam detection. This preliminary action ensures that only reliably verified hostnames are used for spam filtering decisions, preventing false positives that would block legitimate emails. The validation occurs before the spam detection decision is made.
Solution Approach 2:
The patent inverts the traditional approach by using forward DNS lookup results to validate reverse DNS results rather than relying solely on reverse lookup. Instead of accepting reverse DNS results at face value, the system checks them against forward lookup data, ensuring accuracy. This inverted validation approach maintains spam detection effectiveness while improving reliability by filtering out false positives.
Data Source
AI summary
The present invention provides a new and improved domain name searching method and system which comprises steps selected from the group consisting of (1) downloading all zone files, public and/or non-public, associated with one or more host names; (2) performing reverse DNS on IPs associated with said host names in associated root servers and name servers; (3) crawling websites associated with said host names and seeking new hosts on known websites in different TLDs; (4) indexing all new host names found; (5) resolving the associated IP address with each host name, and with optionally appending “www” thereby; (6) storing DNS entries and indexing same while logging their association with host names; (7) repeating any of steps (1) through (6) one or more times.