Cross-referencing dynamic IP logs under Carrier-Grade NAT (CGNAT) requires correlating shared public IPv4 timestamps with carrier-grade network address translation port-mapping allocation logs from the Internet Service Provider (ISP). Investigators analyze application utility headers, proxy connection records, and session metadata to isolate precise port allocation intervals and subscriber port-block assignments. By cross-matching exact microsecond session timestamps and source port numbers against the ISP’s internal radius authentication logs, technical analysts can effectively de-anonymize the traffic. This advanced digital forensics workflow bridges the gap between shared gateway routing addresses and unique subscriber identities, bypassing the obfuscation inherent in modern CGNAT architectures.

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