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: 205
Hash: 19f8049189a25a4598929756b55568be43ee4f851c54a5f60838d148a49f1cee
Previous block: 59b45d3aac6bc5753e9aeb8dd0bd4543ed32ce9cc42c074c4d684e4d7db518cb
Next block: 7b422c598fd0335c83bd7531f6a3a207c84a37c7eda360ab08b61ba0ec5ddcfd
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1564711363
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: a00348c2804905d1858e3bde7183ee27969812e8d7c2fd4cea8dbf001fc6d3a1
Median time: 1544074767
Difficulty: 4.656542373906925e-10
Confirmations: 399
Chainwork: 000000000000000000000000000000000000000000000000000000000000019c
Bits: 207fffff