Reach is a "hack" for Minecraft that modifies the client-side range of the
player. Usually, your client-side reach is 3 blocks, but it can be increased up to 6 blocks. Why? (TeChNiCaL tAlK
tImE!!!) Well, the server you are connected to treats everyone with a reach of 6 blocks, it's the CLIENT that restricts your reach to 3 blocks. However, client-side reach doesn't restrict the 6
block server-side reach when breaking blocks, which means you can
break blocks that are 6 blocks away. The client-side reach only affects click on entities (Other players, mobs, etc.).
Since players that use this "hack" give themselves an unfair advantage towards
legit players, reach hacks are bannable on almost all Minecraft servers.
According to darthdoesmc, a Hypixel
moderator, typical reach hacks are NOT possible on the Hypixel network because apparently, NoCheatPlus actually blocks all reach that is
outside the general Minecraft range.
Spell it with me,
kids! L-I-E-S!