|
Self SEO Store  SEO forum Website templates Flash templates Articles archive Submit your article Register Login Search XML news feeds Free RSS news reader Contact Advertising
Best hosting reviews. Free Internet & IT Magazines. 
 
Alexa Rank Checker
Check Google Pagerank Domain Typo Generator Google Pagerank Prediction Google ban check Link Popularity Checker Keyword Suggestion Tool Keyword Misspelling Search engine ranking report Number of pages indexed
Find IP address of a website
Find host by IP HTTP Headers Check International WHOIS IP to country Ping test Server Status Check What is my IP ? Your browser details
HTML Optimizer
HTML Source Viewer Link Extractor Search engine spider simulator Meta tags Generator Meta tags Extractor Website speed test
Coming soon ...
Affiliate Marketing Anti Spam Blogging Copywriting Domain Names Ebay Tips and Tricks E-Books E Commerce Email Marketing Google Adsense Hardware Internet Internet Connections Internet Marketing Internet Security Link Popularity Newsletters Online Promotion Personal Tech Podcasting Pay Per Click RSS Search Engine Optimization Search Engines Software Streaming Media Traffic Building and Analysis VoIP Web Hosting Web Design Web Development Webmaster Tips |
IP AddressesPosted by Renato Piccini on: 2006-04-03 14:13:59
Self SEO > Internet Articles Every computer must have a unique number in order to work properly in a network or on the Internet. This number is called address because it makes possible for a computer to be found by other computers - ( something like the human addresses! ) -and to establish a communication with them. So we have IP address: Internet Protocol address. This number is in the form of XXX . XXX . XXX . XXX where XXX is an integer number between 0 and 255. ( DOTTED QUAD: four group of decimal numbers separated by a dot ). Computers don't understand our decimal system but only electrical signals like on - off, so we must use the binary system (base 2 not base 10) where a number is composed by a series of 0 and 1. Example: 7 is represented by 00000111. Every binary cypher, that is 1 or 0, is a bit and 8 bits makes one byte. So 255 is,in binary,11111111. Since every group of the IP address is formed by 8 bits and there are four groups (or four bytes ), we say that an IP address is 32 bits long ( 8 x 4 = 32 ). Example 192.0.2.79 , in binary, looks like this: 11000000000000000000001001001111 Since there are 2 cyphers - 0 and 1 - it is possible to have 4.294.967.296 ( 232 ) of different combinations of addresses. Every IP addresses shows two things: the network to which the computer belongs and the host, that is the number of the computers. There are private IP addresses ( computers NOT connected to the Internet) and public IP addresses ( computers CONNECTED to the Internet ). IP addresses are divided in classes: A - B - C - D - E Class A: IP addresses between 1.0.0.0 and 127.255.255.255. The first byte identifies the networks, the next 3 bytes the host. We have 127 networks and 16.777.216 hosts. Class B: IP addresses between 128.0.0.0 and 191.255.255.255. The first 2 bytes identify the networks, the next 2 bytes the hosts. The first byte is limited to 128 - 191, so we have 16384 networks and 65536 hosts. Class C: IP addresses between 192.0.0.0 and 223.255.255.255. The first 3 bytes identify the networks, the last byte the hosts. The first byte is limited to 192 - 223, so we have 2.097.152 networks and 256 hosts Class D: it is used for multicast, that is when just one host is broadcasting and all the others are receiving. Class E: for future use Private IP addresses: From 10.000 to 10.254.254.254 From 172.16.0.0 to 172.31.254.254 From 192.168.0.0 to 192.168.254.254 IP addresses may be dynamic or static. Dynamic when the addresses changes every time that a computer or network is connected to the Internet - the ISP gives a different address at every connection. Static when the address is still the same. There will be a new kind of IP addresses, IPV6 ( base 16 ) which will allow to have more addresses. Renato Piccini - Florence - Italy
Computers Networks technician
http://www.softgrafic.com
This site does not allow anonymous comments. Registered members can login to participate. Registration is free and takes only a few seconds |
