Instrument 01 Sourced protocol comparator

Pick a version. See what still connects.

Compare two recorded Minecraft: Java Edition releases. The result classifies their stock protocol fit, shows both protocol readings, names what remains uncertain, and keeps the source and guide trail attached.

Result baySelect a client and a server version, then read the compatibility record.

Manual reading

JavaScript is off, so the interactive verdict stays unavailable. Open the stable release record, compare the two protocol numbers, and read theserver compatibility guide. Equal verified protocol numbers align at the stock handshake; unequal numbers need a server-side translation layer. Any row markedverify remains Unknown until its sources are checked again.

Sourced crossings:1.12.2 vs 1.13, 1.12.2 vs 1.19.4, 1.16.5 vs 1.17, 1.17.1 vs 1.18, 1.20.4 vs 1.20.6, 1.8.9 vs 1.21.1.

Procedure index Read before adjustment

Before you change anything

01 / preserveBack up before you go back
World saves do not survive round trips.
02 / isolateRun an older version safely
Official launcher steps and a separate game directory.
03 / translateServer-side compatibility
What protocol translation can and cannot establish.

Compiled 2026-07-14 from Mojang version manifest v2, minecraft.wiki protocol version record, PrismarineJS minecraft-data.Coverage ends at 2025-07; verification-hold and unsupported releases resolve to Unknown rather than a guessed class.