Fit test CP–01 Curated crossing
Java 1.16.5 vs 1.17
Cut / context
Version proximity does not create protocol compatibility. A stock client and server must agree on the protocol number, and these two releases do not.
The dated record assigns protocols 754 and 755. Their inequality is the complete basis for the Direct mismatch shown below.
Measurement Published record
Side by side
| Fact | 1.16.5 | 1.17 |
|---|---|---|
| Published | 2021-01-15 | 2021-06-08 |
| Network protocol | 754 | 755 |
| Evidence state | published | published |
Fit result Deterministic protocol test
Handshake verdict
Direct mismatch
Protocol context
1.16.5 uses protocol 754; 1.17 uses protocol 755.
- The recorded protocols differ: 754 versus 755.
- Treat bridge support as Unknown until the server operator publishes dated, attributable evidence.
Uncertainty
A direct stock join does not match. A server-side translation layer may change the practical result, but version numbers alone cannot prove that one is installed.
Full records: 1.16.5 and1.17. Moving a world across this gap?Back up first.
Compiled 2026-07-14 from Mojang version manifest v2, minecraft.wiki protocol version record, PrismarineJS minecraft-data, ViaVersion documentation and repository.Curated comparison comparison-1.16.5-vs-1.17; last substantive change 2026-07-18; publication state published.