The Wi-SUN Alliance has announced that its Field Area Network (FAN) specification has been formally ratified as ISO/IEC/IEEE 32857:2026, a milestone that elevates Wi-SUN FAN from an industry standard to a globally recognized benchmark for wireless mesh networking.
This makes Wi-SUN FAN the first wireless mesh networking specification to be adopted as an ISO/IEC standard, giving utilities, municipalities and infrastructure operators a common, internationally vetted framework for deploying wireless mesh networks in the field.
The move has direct implications for utility operators, city governments and procurement agencies that are assessing networking technologies for critical, large-scale deployments such as smart grids and smart city infrastructure.
Only about 3% of specifications originating in IEEE go on to achieve joint ISO/IEC recognition, a statistic that underlines both the technical maturity of the Wi-SUN FAN specification and the robustness of the open, consensus-driven process that produced it.
For utilities and municipalities, this recognition helps clear a major procurement hurdle, decision-makers and regulators can now point to an internationally ratified standard when evaluating or mandating smart grid and smart city connectivity, instead of relying solely on industry-generated documents and vendor claims.
Leadership Comments
“When a specification carries ISO/IEC recognition, it signals to procurement officials, regulators and policymakers around the world that the technology has been vetted at the highest level,” said Phil Beecher, president and CEO of the Wi-SUN Alliance. “Wi-SUN technology already supports some of the world’s largest utility networks, including 
nationwide smart metering deployments in Japan and large-scale smart grid projects across North America, Europe and Asia-Pacific, demonstrating that the technology is already proven at scale. ISO/IEC/IEEE 32857:2026 gives utilities, municipalities and infrastructure providers an internationally recognized standard they can rely on and reference when planning the next generation of critical infrastructure.”
“The Wi-SUN FAN specification was developed through exactly the kind of rigorous, consensus-driven technical process that ISO and IEC look for when evaluating IEEE work for joint adoption,” said Gary Stuebing, Past Chair Entity Collaborative Activities Governance Board, IEEE SA. “What ISO/IEC/IEEE 32857:2026 tells the market is that this specification was built to last — designed with the depth and precision that implementers need to build global interoperable, certifiable solutions at scale.”
The Wi-SUN Alliance provides the definitive testing and certification program for this specification, helping ensure products are compliant and fully interoperable in multi-vendor deployments.
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