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. mzaGu

Height: 553
Hash: 73512f19508f3ff55c518b21d297d6b75bf814349d91f733b03f629f37bef0db
Previous block: 2df867158147239be63e12a253d43309b57edbe0413ce3e93ed7cdfa6a214c12
Next block: 798391bcd225055eb1310c7d8c3991b1c252e68e86e1df270098bdf53b193dfd
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711421
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: 2a674429e7008c83231e27c9824207ecacce16040e0431d317d9f9bbffcba6c2
Median time: 1564711420
Difficulty: 4.656542373906925e-10
Confirmations: 51
Chainwork: 0000000000000000000000000000000000000000000000000000000000000454
Bits: 207fffff