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. mzaGu

Height: 587
Hash: 3d14d28efdf55807ac80d8681e4a4b796eb65eee2be14544acda13451893b8f5
Previous block: 1310f0406327417f8308c71a78c78228964e6ad2e4afbc46cff41328f500606e
Next block: 5f81966e13ef02719511231edc2c904f4cfe8a11e37c45b0f8aa7fc00c0abbaa
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711427
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: 7f5c7bdd0442934faaf0446f2d683c191cddf980909d27628f0f159997f542fc
Median time: 1564711426
Difficulty: 4.656542373906925e-10
Confirmations: 17
Chainwork: 0000000000000000000000000000000000000000000000000000000000000498
Bits: 207fffff