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Originally Posted by Hero2
by internal ip addresses you mean the subnet masks right they its only use those because their are only certain amount of ip addresses the can be made for use like 4,228,250,625 and thats not alot
i forgot the set rankings but they go from class a to class e i think f and e are for reserved use a is for huge companis and b is for big companies only class c is for normal use.
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class a is 1.0.0.0-126.0.0.0
b is 128.0.0.0-191.255.0.0
c is 192.0.0.0-223.255.255.0
In class c, the first 3 numbers (octets) r network id's, which means that they can have a lot of networks. The last number is a host id, which allows so many users on all those networks.
In class b, first 2 octets are network id's, last 2 host id's.
In class a, first octet is network, last 3 r hosts. So you have ALOT of users on a HUGE n/w.
And all port numbers do is allow or deny access to Netbt/Winsock. Such as http (80) SNMP/DNS/FTP
127.0.0.1 is for loopback testing.