Input Parameters
Lookup Results
Reverse DNS Records (PTR)
| IP Address | PTR Hostname | PTR Record (Query) | TTL (s) | ISP/Owner | Latency (ms) |
|---|
Reverse DNS Lookup Tool
The Real-Time Bulk Reverse DNS Lookup Tool (API Powered)
This **Bulk Reverse DNS Lookup** tool operates in **real-time** by leveraging a dedicated server-side API (at $`/api/reverse-dns-lookup.php`$). Unlike browser-only tools that must use simulations, this implementation guarantees **accurate and authentic** PTR record data, TTL values, and response latency.
The system sends your list of IPv4 and IPv6 addresses to the backend, which performs direct DNS queries and returns the verifiable network intelligence to the frontend table.
The Mechanism: Server-Side Query
The browser's JavaScript initiates an AJAX request to the server, thereby bypassing the browser's security restrictions (Same-Origin Policy) that prevent direct DNS queries from the client side.
The server-side component (PHP, in this case) uses specialized networking functions to construct the reverse DNS query:
For IPv4, the structure is:
\[ \text{Octet 4.Octet 3.Octet 2.Octet 1.in-addr.arpa} \]The result is one or more **PTR (Pointer) Records** that map the IP address back to its associated hostname(s), providing essential information for security and network analysis.
Verifiable Data for Critical Tasks
By using real-time API queries, the data presented is suitable for critical operational and security tasks:
Email Sender Validation (Anti-Spam)
The most crucial application. Accurate PTR records are mandatory for email servers to maintain high sender reputation. This tool provides **verifiable proof** of whether a source IP is properly configured, a key factor in fighting spam and phishing.
Network Troubleshooting and Digital Forensics
Real-time TTL and Latency values are crucial indicators for network performance. Furthermore, obtaining the true hostname helps security teams quickly identify the domain associated with malicious traffic logged in firewalls or server access logs.
The bulk input capability allows for the efficient processing of extensive lists of IPs collected during large-scale network monitoring or security incidents.