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: 1
Hash: 373fdc3edf1c7c854a7aafa97e0fb94f45634d54505fa26a7610aa0089b00d19
Previous block: 0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206
Next block: 2a77dece0972d68761622e956d4f3e1411788d701293258b4ce931c787b8eb7d
Weight: 904
Versionhex: 20000000
Version: 536870912
Time: 1544074732
Stripped size: 226
Size: 226
Nonce: 2
Merkle root: eabad97eb48cc2bb2bf192fba8e3f1636b3f73c71dc0d1fbee1d2744cc20a9e0
Median time: 1544074732
Difficulty: 4.656542373906925e-10
Confirmations: 201
Chainwork: 0000000000000000000000000000000000000000000000000000000000000004
Bits: 207fffff