Editing Dark and Light Wiki:Administrators guide (section)

===Blocking options===
The blocking page has three important options associated with the block:
# '''Block anonymous users only:''' When blocking an IP user, selecting this option will allow any registered users to continue editing from that address. This option has no effect on a block of a registered user, but it does modify any autoblocks (see below) caused by that block.
#:Generally speaking, this isn't a very useful option. Many of the IP users that are blocked are from spammers or spam bots - if they create an account, they'll still be able to access from that location. This option is really only for use when considering a block of a proxy, tor exit node, or dynamic IP address (such as AOL), as it minimizes the likelihood of restricting actual contributors.
# '''Prevent account creation:''' Duh. Anyone that tries to access from the blocked IP address will not be able to create an account.
#:This option should generally be turned on when dealing with an IP spammer, since they've been known to create usernames such as "[[Special:Contributions/Ki3H5x|Ki3H5x]]" to evade blocks. This also works when blocking a registered user - even though we can't see the IP address, the MediaWiki software takes care of it in the background
# '''Automatically block the last IP address used by this user, and any subsequent addresses they try to edit from:''' (Autoblock, for short) This option only applies to blocks of registered user accounts. When enabled, this option will cause the block to also apply to the most recent IP address, and any other addresses that they try to log in from.
#:This is the mack daddy of blocking. This is the block for that l33t h4x0r d00d who thinks that he can get around a block by having his mother drive him to the library so that he can vandalize a wiki. This option should usually be set when blocking a registered spammer/spambot, as it has a decent chance of blocking another address or two before they figure it out.
#:Autoblocks are taken care of in the background by the MediaWiki software, and last for 24 hours. These blocks only appear on the [[Special:Ipblocklist]] page (not in the regular block log) because they are added automatically.
#:Be careful when using the autoblock function, especially in the case of dynamic IPs (AOL being the prime example) as it can result in temporarily blocking large numbers of innocent users.

See [[gphelp:Gamepedia Help Wiki:Blocking guidelines|Blocking guidelines]]<!-- you may link to a local version such as Project:Blocking guidelines if you prefer --> for more detailed information regarding blocking individual users.