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: 173
Hash: 143dd07733dee448025bd1d6fa4ad5976ca806532e1f7c1fc735defb3bd5bf0b
Previous block: 39b083e9cbe21c4124aa8ecd58d5dac6e354e7bc61399bbc47a34ed7474d5ffc
Next block: 52557e1533f06fe55679404efff0a7b00c52363c1b8d79a9124d03eb80e9644d
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074762
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: 579261806dccfe5f6491ec44c92285e13c93d48d09a5c8b44a174d7981153dd4
Median time: 1544074761
Difficulty: 4.656542373906925e-10
Confirmations: 29
Chainwork: 000000000000000000000000000000000000000000000000000000000000015c
Bits: 207fffff