Editing
Help:Range blocks
(section)
Jump to navigation
Jump to search
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
==Non-technical explanation== IP address are broken up into blocks of numbers. An example of this would be <tt>148.20.57.0</tt> through to <tt>148.20.57.255</tt>. Once it reaches <tt>255</tt> the next number is <tt>148.20.58.0</tt>. IP addresses can be broken up in to smaller or larger blocks. The smallest practical block is a block of 4. This could be one of the following: :<tt>148.20.57.0 - 148.20.57.3</tt>, or :<tt>148.20.57.4 - 148.20.57.7</tt>, or :<tt>148.20.57.8 - 148.20.57.11</tt>, etc. Of each block of 4 numbers, only two can be assigned to a computer. The first and last numbers of any block are reserved for network communication. These are level 30 blocks and can be expressed like this: :<tt>148.20.57.0/30</tt>, or :<tt>148.20.57.4/30</tt>, or :<tt>148.20.57.8/30</tt>, etc. The next largest block is 8. They can be as follows: :<tt>148.20.57.0 - 148.20.57.7</tt>, or :<tt>148.20.57.8 - 148.20.57.15</tt>, or :<tt>148.20.57.16 - 148.20.57.23</tt>, etc. In this block of 8 numbers only 6 can be assigned to a computer as, once again, the first and last numbers in a block are reserved for specific uses in network communication. These can also be expressed as follows: :<tt>148.20.57.0/29</tt>, or :<tt>148.20.57.8/29</tt>, or :<tt>148.20.57.16/29</tt>, etc. From this point on, the number of IP addresses in a block continue to double: 16, 32, 64, 128, 256, etc. :A block of 16 would start <tt>148.20.57.0/28</tt>. :A block of 32 would start <tt>148.20.57.0/27</tt>. :A block of 64 would start <tt>148.20.57.0/26</tt>. :A block of 128 would start <tt>148.20.57.0/25</tt>. :A block of 256 would start <tt>148.20.57.0/24</tt>. So if you have an IP address and you want to block the range assigned how do you know which one to use? Let's say you have a problem with <tt>148.20.57.34</tt>. You can lookup who has this IP address at http://arin.net/whois/?queryinput=148.20.57.34. Say this tells us that this IP address is assigned, along with a LOT of others in a <tt>/17</tt> range, to the Department of Defense. We certainly don't want to block a large block of the DoD! The rule of thumb is block as little as possible. Only block a range if there is a cluster of IP addresses giving a problem. There's a calculator that is very useful for this: http://www.csgnetwork.com/ipinfocalc.html. Go to this site and enter <code>148.20.57.34</code> into the first set of blanks. Now select Network Prefix Length and enter <code>27</code> (this will give a block of 32 addresses) and click Calculate Network Information. This will show us a block of 32 IP addresses that include <tt>148.20.57.34</tt>. (The first - network - and the last - broadcast - addresses will be displayed along with the usable addresses in the range.) You can use this tool to test ranges to be sure they are what you want before entering the information to initiate the block.
Summary:
Please note that all contributions to Fanra's EverQuest Wiki are considered to be released under the Creative Commons Attribution Share Alike (see
Project:Copyrights
for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource.
Do not submit copyrighted work without permission!
To protect the wiki against automated edit spam, we kindly ask you to solve the following CAPTCHA:
Cancel
Editing help
(opens in new window)
Navigation menu
Personal tools
Not logged in
Talk
Contributions
Log in
Namespaces
Help page
Discussion
English
Views
Read
Edit source
View history
More
Search
Main Menu
Main page
Sections
Classes and Races
Spells, Songs, Disciplines, and AAs
Items
Zones
NPCs
Quests
Raids
Tradeskills
User Interface
Tips and Guides
EQ Links
Wiki
Recent changes
Advanced search
Random page
Help
Contact Fanra
Tools
What links here
Related changes
Upload file
Special pages
Page information