Fit test CP–01 Curated crossing
Java 1.17.1 vs 1.18
Cut / context
The dated record assigns protocol 756 to Java 1.17.1 and protocol 757 to Java 1.18. The unequal published values produce a Direct mismatch.
This protocol result does not establish saved-data behavior or extension support. Use release-specific primary documentation for those separate questions.
Measurement Published record
Side by side
| Fact | 1.17.1 | 1.18 |
|---|---|---|
| Published | 2021-07-06 | 2021-11-30 |
| Network protocol | 756 | 757 |
| Evidence state | published | published |
Fit result Deterministic protocol test
Handshake verdict
Direct mismatch
Protocol context
1.17.1 uses protocol 756; 1.18 uses protocol 757.
- The recorded protocols differ: 756 versus 757.
- 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: 1.17.1 and1.18. 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-1.17.1-vs-1.18; last substantive change 2026-07-18; publication state published.