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. mressCpnG

Height: 199
Hash: 337e42ffa966003161b6c6aaf002f16d33e0ac3fcf18efbe14a885125cd67e02
Previous block: 2f4c72c5e7aaa638a4cf4619ae5de12487f5ea830b5f977e81d09bfc468252b5
Next block: 2679d9cfe4a3cf7c589fa403f258b37cb315269b65eb8d104a7b3c1067b3640a
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074766
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: 565db9a99a7ab69fd0682144c5c7b343ad36877fe3c8760d308459a1842d2788
Median time: 1544074766
Difficulty: 4.656542373906925e-10
Confirmations: 3
Chainwork: 0000000000000000000000000000000000000000000000000000000000000190
Bits: 207fffff