RDNSx: Reverse DNS Reconnaissance Tool for Telecom Networks
Rust-Powered DNS Security & Telecom Recon Toolkit
Industrial-strength asynchronous DNS toolkit engineered in Rust. Specifically optimized for mapping massive telecommunications infrastructure, GGSN/PGW interface discovery, and carrier-grade subdomain enumeration. Capable of high-throughput DNSSEC chain analysis and deep SPF/DMARC/DKIM configuration auditing.
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Register to deploy RDNSx via the TelcoSec platform.
PLATFORM ACCESS [→]- ►RDNS RECON
Advanced reverse DNS reconnaissance for mapping carrier infrastructure using custom resolver logic that bypasses OS-level caches.
- ►TELCO IP MAPPING
Mapping IP ranges to specific carrier nodes and regions, including GGSN/PGW interfaces and hidden internal Signaling Transfer Points.
- ►ZONE TRANS DETECTOR
Detecting misconfigured zone transfers in carrier DNS that expose full internal namespace mappings to unauthorized parties.
- ►PTR RECORDS FUZZER
Intelligent fuzzing of PTR records with wildcard suppression heuristics to surface unique high-value infrastructure hosts.
MEMORY SAFETY
Zero-cost abstractions and the borrow checker ensure memory safety without a garbage collector, preventing buffer overflows in low-level DNS parsing.
ASYNC THROUGHPUT
Leveraging the Tokio runtime for non-blocking I/O, RDNSx handles millions of concurrent DNS queries with minimal CPU overhead.
PREDICTABLE PERF
Minimal runtime footprint and deterministic performance make it ideal for deployment in constrained environments or long-running monitoring pipelines.
CORE INFRA MAPPING
Reverse DNS is often the only way to discover internal GGSN and PGW interfaces not exposed via standard forward DNS.
- > Discovering hidden APN endpoints
- > Mapping S5/S8 interconnect interfaces
- > Identifying localized RAN controllers
COMPLIANCE AUDITING
Telecom operators must ensure internal infrastructure hostnames do not leak sensitive information through PTR records.
- > DNSSEC validation across carrier zones
- > SPF/DMARC leakage detection
- > Unauthorized zone transfer (AXFR) auditing
RDNSx is designed to handle the complex routing and DNS environments characteristic of Tier-1 telecommunications networks. In typical enterprise IT setups, reverse DNS records are either fully populated or entirely absent. In contrast, mobile carrier networks often deploy hybrid, localized, or split-horizon DNS setups. To successfully map these networks, RDNSx implements a custom resolver client built on top of trust-dns-proto. This allows the toolkit to bypass the operating system's local DNS cache, query authoritative servers directly, and dynamically adjust query timeouts to prevent false-negative timeouts on congested GGSN or PGW backhauls.
The tool features custom heuristics to detect wildcard PTR records and load-balanced DNS pools. In many mobile networks, carriers configure large blocks of IP addresses to resolve to generic, auto-generated names (e.g., node-10-1-2-3.sp.carrier.net). RDNSx automatically identifies these patterns, groups them to reduce clutter, and filters them out of final reports, allowing analysts to focus on unique, high-value infrastructure targets such as internal Signaling Transfer Points (STPs), SMSCs, or core router interfaces.