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: 5
Hash: 66474786c9acac43105951648370eaa9da8598c7c54327215bb58adae967ecf4
Previous block: 68cbfe12f35226e2e5c9f2955e29391e918e8a55bf21c99da1f8a02b5c9e3811
Next block: 6c9fd2bd32d1d897929cb4c9cc3fb80bd4f56bb6cfe10fcf3640bfa2d42b1db8
Weight: 904
Versionhex: 20000000
Version: 536870912
Time: 1544074734
Stripped size: 226
Size: 226
Nonce: 0
Merkle root: 0738c3edc5b5f5ae4d428d4945e6912e4c7884b1d143175d745366eccd3248c4
Median time: 1544074733
Difficulty: 4.656542373906925e-10
Confirmations: 197
Chainwork: 000000000000000000000000000000000000000000000000000000000000000c
Bits: 207fffff