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 github.com/pdxrod/blockchain_explorer.

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

Height: 194
Hash: 440e76c1c5696e85e1d132fc80d30e03fa916abe0038e17f829ae544e5deefde
Previous block: 60add3f63845d47803b9e149a276f24d5ab0ddc785623f4460a173b0b42675c1
Next block: 023f24636488bb126523aa45a1a2ba24932d575404c4b3e90d00a013f99147e6
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074766
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: 9a3ca92092684bf0921e6f85302b4781a0f48e005f83a5f4dd385369981b091b
Median time: 1544074765
Difficulty: 4.656542373906925e-10
Confirmations: 8
Chainwork: 0000000000000000000000000000000000000000000000000000000000000186
Bits: 207fffff