IPv4 Address Exhaustion: Mitigation Strategies, Architectural Trade-Offs, and IPv6 Transition Challenges

Abstract

For over a decade, the global internet has navigated a depleted IPv4 address pool. The telecommunications industry has maintained legacy operations through complex mitigation frameworks, primarily Dual-Stack, Tunneling, and stateful Translation mechanisms (e.g., CGNAT and PAT). To evaluate the long-term architectural and economic implications of these strategies, this review employs a thematic synthesis of 24 peer-reviewed studies and recent empirical simulations published over the last ten years, sourced from major academic databases using specific inclusion criteria. The thematic synthesis applies a structured coding framework to extract performance (latency, packet loss), security, and economic indicators across the selected studies, enabling comparative evaluation. The analysis reveals a structural paradox: while these mechanisms successfully bypass immediate address exhaustion and scale existing networks, they often compromise the Internet's end-to-end design and introduce complex security vulnerabilities. The findings indicate that stateful translation mechanisms introduce measurable latency increases (up to reported 15–30% in high-load scenarios) and scalability bottlenecks, while Dual-Stack architectures significantly increase resource utilization. Furthermore, the persistence of mitigation frameworks contributes to the expansion of the IPv4 leasing market, creating economic disincentives for IPv6 adoption. This review is limited by reliance on publicly available datasets and simulation-based studies, with restricted access to proprietary ISP operational metrics. Ultimately, current transition mechanisms serve as necessary pragmatic interim phases rather than sustainable permanent solutions, highlighting the critical need for a definitive shift toward native IPv6.