5G/B5G and 6G experimentation will build on pillars on softwarization, cloud, disaggregated Radio Access Networks (RAN) and service based architecture (SBA) to support use cases and different industry verticals. We will hear from a panel of global research infrastructure operators of large scale public-private testbed facilities on the network architecture,capabilities and domain use cases supported. This panel will inform the audience of national and global research infrastructure initiatives and their relevance to Beyond5G/6G fundamental research topics.