Detect and fight the exploitation of various flaws/bugs in Minecraft!

Features Permissions Commands Configuration Jenkins

NOW! With Minecraft 1.10 support! (on Jenkins)

Quick overview: NCP by version of Minecraft
(Links may lead to downloads not approved by BukkitDev staff, use at your own risk.)
GitHub Issue for 1.10 progress (overview)


NoCheatPlus attempts to prevent cheat clients from exploiting weaknesses of Minecraft or its protocol, making your server more safe. Checks cover a wide range of issues including flying and speeding, fighting hacks, fast block breaking and nukers, inventory hacks, chat spam and other types of malicious behaviour. For a more complete list have a look at the Features Page.

NoCheatPlus puts emphasis on configurability and allows you to customize actions that are carried out when a player fails a check (e.g. silent cancelling, executing commands, just logging). Bypass permissions allow to control what check to apply for which players, all checks can be deactivated in the configuration, also having the option for world-specific configuration files. Many checks allow more detailed configuration to adjust sensitivity.

Certainly NoCheatPlus is not a magical bullet, it uses a lot of heuristics and even guessing, so you will encounter false positives here and there and also not catch every single violation. Example video of how NoCheatPlus blocks cheats (outdated plugin version).

NoCheatPlus was introduced by NeatMonster, building on the code base of NoCheat by Evenprime.

The following plugins might be useful to have a look at.


Allows NoCheatPlus to activate packet-level checks, covering a range of exploits that can't be monitored using ordinary means. Since roughly Minecraft 1.7.10, the fight.speed check can't work as expected anymore, due to changes in CraftBukkit. With ProtocolLib this can be repaired.

CompatNoCheatPlus (cncp)

Make plugins like mcMMO, Citizens, MagicSpells or MachinaCraft more compatbile with NoCheatPlus. Not all existing plugins are covered (yet), but you can leave a note or create an issue/ticket request for cncp.


Orebfuscator fights all sorts of X-ray-hacks by altering the map information that is sent to the players, such that they have to mine blocks to actually reveal what is behind. Virtually a "must have". (Latest versions of Spigot contain features of Orebfuscator.)

Downloads and History of Changes


Documentation Resources

Contact us

  • Quick questions can be asked on this page,
    or on IRC (Server: | Default-Port: 6667 | SSL-Port: 6697 | Channel: #nocheat | Web client: WebIRC)
  • For real issues or feature requests please create a new issue/ticket or add to an existing issue/ticket.
  • To send information that is not to be seen by all, you can also reach us by PM to @asofold and @MyPictures. @IceAP (IRC: ICE) will also help or redirect the conversation. Please do not contact the user 'NoCheatPlus', it is for administrative purposes only and will likely not be answered in time. Keep to BukkitDev and GitHub for support, do not trust users on other forums or websites, also not if their nick names are the same as NCP staff on BukkitDev.

Please always state the output of the "ncp version" command to let us know versions in use (users of cncp also the "cncp" command).

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  • Avatar of asofold asofold Jan 05, 2014 at 14:34 UTC - 0 likes

    @Flipperflies555: Go

    "So it would seem."

    @zachrywilsn: Go

    This likely is caused by some combat-tag plugin, a maliciously set up NPC plugin (NPC registered as actual players with real player names who are also online), or some plugin that kicks players during login/join.

    If NCP still works it might be ok, if you get more errors, or if you have NPCs with the players names, then it is a problem.

    You can turn it off in the configuration (data.consistencychecks.suppresswarnings), though that would not help finding the causes - can you PM a plugin list?


    Latest beta release (1.8.x, this site) 3.13.0-BETA-sMD5NET-b878
    (Development builds, 1.8.x: Jenkins)

  • Avatar of zachrywilsn zachrywilsn Jan 04, 2014 at 23:17 UTC - 0 likes

    @asofold: Go

    [15:24:12 WARN]: [NoCheatPlus] DataMan inconsistencies: wrong number of online players (29 instead of 28)

    getting spammed with this all of a sudden. no changes to server. what could it be and will it effect server? an would it be ok to turn off in setting?

  • Avatar of Flipperflies555 Flipperflies555 Jan 04, 2014 at 15:53 UTC - 0 likes

    Doughnuts! Love you!

  • Avatar of asofold asofold Jan 04, 2014 at 14:01 UTC - 0 likes

    @jimmikaelkael: Go

    Thanks for checking :9.

    @libraryaddict: Go

    So "illegal move" - there should be several ways around it - can you specify what values you change in NMS (e.g.width, height, bounding box parameters)?

    @Wizel603: Go

    I'm afraid for simplicity the delay parameter has been removed from the action commands - except for "ncp delay".

    So you would have to use "ncp delay delay=100 tell wizel603 the message" !

    @Minecraftian_Servers: Go

    Have you updated ProtocolLib in case you are running that?

  • Avatar of Minecraftian_Servers Minecraftian_Servers Jan 04, 2014 at 12:08 UTC - 0 likes

    Hi, after I installed NoCheatPlus, my server has started to crash more often, but I havn't got any errors or anything, so I don't know if its NoCheatPlus, but if anyone else has the problem please reply so the author sees that theres a crashing bug (if there is)

  • Avatar of Wizel603 Wizel603 Jan 04, 2014 at 06:21 UTC - 0 likes

    I may be misunderstanding its use, but when using the form with "delay=(ticks)" below, the message never goes through no matter what I specify for '(ticks)'.

    /ncp tell [delay=(ticks)] (player) (message)

    For example, nothing ever shows up on the player's chat when this is entered:

    /ncp tell delay=100 Wizel603 the message
  • Avatar of libraryaddict libraryaddict Jan 03, 2014 at 22:46 UTC - 0 likes

    @asofold: Go

    I specifically mean the bounding box.

    I only try to modify packets which normally will not effect anything.

    But to get a larger bounding box so someone disguised as a enderdragon is easily hit with a projectile. I'm forced to hook into nms to change the boundingBox.

    So no. I don't give them any sort of flymode.

    And specially, player is kicked with 'Illegal move'


  • Avatar of jimmikaelkael jimmikaelkael Jan 03, 2014 at 15:59 UTC - 0 likes

    @asofold: Go

    I tested as a member, and normally my NoCheatPlus permissions (wildcards) are at the Admin group level, so I doubt I've made this mistake but I'll check twice to be sure. Anyway, I'll try as a new member and will be more verbose with what I used if I can still cheat.

    Thank you for your quick reply, keep up with such great plugin guys !

    EDIT: bad report, sorry.

    Last edited Jan 03, 2014 by jimmikaelkael
  • Avatar of asofold asofold Jan 03, 2014 at 15:52 UTC - 0 likes

    @mrchasez: Go

    The only way to alter block breaking is to allow instant breaking for those blocks (probably not intended, but i f it is about few blocks, it could serve as an emergency-workaround).

    We still have to reproduce this issue.

    @libraryaddict: Go

    Can you be more specific about the conflicts? Which checks alert, what happens?
    If fly works, then likely the checks are not run at all.

    Are the players set to flying when being disguised as an ender-dragon?

    @jimmikaelkael: Go

    Did you ensure not to have bypass permissions (wildcards, nocheatplus.checks, OP)?

    Last edited Jan 03, 2014 by asofold
  • Avatar of jimmikaelkael jimmikaelkael Jan 03, 2014 at 15:34 UTC - 0 likes

    I've tried a recent Nodus version on my 1.7.2 server (Spigot r1224, NCP 3.10.7), and logged in ad a member, seems I can use most of the Cheats (tested Fly and Forcefield) without triggering any VL notification nor being kicked...

    Notification are properly activated as I get VL for old survivalfly method with placing blocks in a protected area.

    EDIT: my bad, I forgot to deop me from a previous commandblock editing session... I'm really sorry for the bad report posted below: once de-opped NCP detects all cheats from the recent Nodus release. I'm sorry, once again.

    Last edited Jan 03, 2014 by jimmikaelkael


Date created
Apr 02, 2012
Last update
Jan 31, 2016
Development stage
GNU General Public License version 3 (GPLv3)
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