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This question already has an answer here:

Is there an easy way in the Geth console to see the current numbers of blocks in existence?

Same as "best block" at ethstats.net.

I tried admin.chainSyncStatus but it just returns 'undefined'

merged by eth May 22 '16 at 10:55

This question was merged with How can I find out what the highest block is? because it is an exact duplicate of that question.

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