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: 166
Hash: 751b7631e06fbf5b2be298de502bbeafb53436a0a71c5751c1cb041b209355da
Previous block: 55267f693fe825c33ceae72a7b7329a15cdd559c9d60c35af8801752ce9329f3
Next block: 5a00b8a580203b4cec7ae5b57497b3890f82554f7587b5e74b32442b693e5c67
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074761
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: ead9a7c8dba80f5b1f5cc048ab4e56c0477498d7d72159fdf280069f9f1d258a
Median time: 1544074760
Difficulty: 4.656542373906925e-10
Confirmations: 36
Chainwork: 000000000000000000000000000000000000000000000000000000000000014e
Bits: 207fffff