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: 172
Hash: 39b083e9cbe21c4124aa8ecd58d5dac6e354e7bc61399bbc47a34ed7474d5ffc
Previous block: 30c783518185a9c19d327835536bfa1fd3ce0baaadfc1ef76660a8f86088f9a9
Next block: 143dd07733dee448025bd1d6fa4ad5976ca806532e1f7c1fc735defb3bd5bf0b
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074762
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: 166d28cb3c0c978ebf52deba7627f84a129342b1350b4db569594fc42ebabcaf
Median time: 1544074761
Difficulty: 4.656542373906925e-10
Confirmations: 30
Chainwork: 000000000000000000000000000000000000000000000000000000000000015a
Bits: 207fffff