Is there a node network explorer or some kind of overview page ?

Yes, there is:

Link above is an early analytical page for node related decentralized network statistics. Currently it provides:

  • Presearch Network Status - Insight into number of nodes in each of the Mainnet regions and Testnet. Also provides number of active nodes over the world (per country)

  • Daily Search Statistics - Values are providing a sliding window of last 24h per metrics of # of Total searches and # of Guest searches executed as well as # of Usage Rewards allocated

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