The explorer is running in 'regtest' mode. This saves disk space, but there is limited data.
The code for this application can be found at

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Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mzaGuArPa

Height: 0
Hash: 0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206
Previous block:
Next block: 373fdc3edf1c7c854a7aafa97e0fb94f45634d54505fa26a7610aa0089b00d19
Weight: 1140
Versionhex: 00000001
Version: 1
Time: 1296688602
Stripped size: 285
Size: 285
Nonce: 2
Merkle root: 4a5e1e4baab89f3a32518a88c31bc87f618f76673e2cc77ab2127b7afdeda33b
Median time: 1296688602
Difficulty: 4.656542373906925e-10
Confirmations: 202
Chainwork: 0000000000000000000000000000000000000000000000000000000000000002
Bits: 207fffff