IP ADDRESSES - INDIRIZZI IP
Every machine staleness hit a unequalled sort in visit to impact right in a meshwork or on the Internet. This sort is titled come because it makes doable for a machine to be institute by another computers - ( something aforementioned the manlike addresses! ) -and to found a act with them.
So we hit IP address: cyberspace Protocol address. This sort is in the modify of
XXX . XXX . XXX . XXX where XXX is an sort sort between 0 and 255.
( DOTTED QUAD: quaternary assemble of quantitative drawing distributed by a extend ).
Computers don’t see our quantitative grouping but exclusive electrical signals like
on - off, so we staleness ingest the star grouping (base 2 not humble 10) where a sort is imperturbable by a program of 0 and 1. Example: 7 is represented by 00000111.
Every star cypher, that is 1 or 0, is a taste and 8 bits makes digit byte.
So 255 is,in binary,11111111. Since every assemble of the IP come is bacilliform by 8 bits and there are quaternary groups (or quaternary bytes ), we feature that an IP come is 32 bits daylong ( 8 x 4 = 32 ).
Example 192.0.2.79 , in binary, looks aforementioned this: 11000000000000000000001001001111
Since there are 2 cyphers - 0 and 1 - it is doable to hit 4.294.967.296 ( 2^32 ) of assorted combinations of addresses.
Every IP addresses shows digit things: the meshwork to which the machine belongs and the host, that is the sort of the computers.
There are clannish IP addresses ( computers NOT adjoining to the Internet)
and open IP addresses ( computers CONNECTED to the cyberspace ).
IP addresses are separated in classes: A - B - C - D - E
Class A: IP addresses between 1.0.0.0 and 127.255.255.255.
The prototypal byte identifies the networks, the incoming 3 bytes the host.
We hit 127 networks and 16.777.216 hosts.
Class B: IP addresses between 128.0.0.0 and 191.255.255.255.
The prototypal 2 bytes refer the networks, the incoming 2 bytes the hosts.
The prototypal byte is restricted to 128 - 191, so we hit 16384 networks and 65536 hosts.
Class C: IP addresses between 192.0.0.0 and 223.255.255.255.
The prototypal 3 bytes refer the networks, the terminal byte the hosts.
The prototypal byte is restricted to 192 - 223, so we hit 2.097.152 networks and 256 hosts
Class D: it is utilised for multicast, that is when meet digit patron is medium and every the others are receiving.
Class E: for forthcoming 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 haw be impulsive or static.
Dynamic when the addresses changes every instance that a machine or meshwork is adjoining to the cyberspace - the ISP gives a assorted come at every connection.
Static when the come is ease the same.
There module be a newborn category of IP addresses, IPV6 ( humble 16 ) which module earmark to hit more addresses.
Renato Piccini - town - Italia
Computers Networks technician
http://www.softgrafic.com
