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: 204
Hash: 59b45d3aac6bc5753e9aeb8dd0bd4543ed32ce9cc42c074c4d684e4d7db518cb
Previous block: 53929852d700737a22692ef779117c1ab08c3e9c894c73969b07a32b064a8a3b
Next block: 19f8049189a25a4598929756b55568be43ee4f851c54a5f60838d148a49f1cee
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1564711363
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: 50e588bf688d5a62cbe9776d37905554e8d7e1f3045196d508b822d6d09d09c3
Median time: 1544074766
Difficulty: 4.656542373906925e-10
Confirmations: 400
Chainwork: 000000000000000000000000000000000000000000000000000000000000019a
Bits: 207fffff