The 9th Asia-Pacific Workshop on Networking (APNet’25) will be held in Shanghai, China on August 7-8, 2025. Building on the success of its predecessors, APNet’25 will continue to bring together the very best researchers in computer networking and systems across the Asia-Pacific region and around the globe to a live forum discussing innovative ideas at their early stages. The mission of APNet is that promising but not-yet-mature ideas can receive timely feedback from the community and experienced researchers, leading them into publications at major conferences such as SIGCOMM, NSDI, SOSP, OSDI, EuroSys, MobiCom, and CoNEXT. We invite submissions of short papers (up to 6 pages, excluding references) on a wide range of networking research, including, but not limited to: Network architectures and algorithms Cloud and wide-area networking systems & infrastructure Networking for Machine Learning and Machine Learning for Networking Operating system support for networking High-speed networking and applications Domain-specific networks including datacenter, storage, intra-host networks, etc. SDN, NFV, and network programming Networking hardware design and application Network measurement, monitoring, diagnosis, and operations Formal methods and network verification Network security and privacy, censorship, transparency Network, transport, and application-layer protocols Resource management, QoS, and signaling Routing, traffic engineering, switching, and addressing Wireless, mobile, and sensor networking Programmable End Host (e.g., eBPF, SmartNics) The APNet Technical Program Committee will evaluate submissions based on their novelty, significance, and technical merit, rather than completeness. Innovative and well-reasoned ideas supported by preliminary evaluations are sufficient for APNet. We encourage authors to further develop their APNet papers with robust implementations and experiments, aiming for publication in the aforementioned premier conferences.