05-08-2006
Your assumption is correct.
Because the number of available Internet routed IP addresses is limited
(at least for the time being until someday IPv6 will take over IPv4)
most ISPs have many, many fewer Internet IP address than customers
they have to provide with.
The same is mostly true for the bandwidth they sell.
They speculate that not all their customers will require Internet access at the
same time (much like a bank has more debters than they could redeem instantly).
Therefore they only posses a limited pool of IP addresses that they
assign dynamically each time a customer requests Internet access.
Because of the limited pool and the great demand it happens regularily that the next client in the queue gets the very same IP address someone else have been holding so far once he quits or gets kicked of (which forcebly happens at least once a day even for DSL clients of many ISPs)
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LEARN ABOUT ULTRIX
inet_addr
inet(3n) inet(3n)
Name
inet_addr, inet_network, inet_ntoa, inet_makeaddr, inet_lnaof, inet_netof - Internet address manipulation routines
Syntax
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
unsigned long inet_addr(cp)
char *cp;
unsigned long inet_network(cp)
char *cp;
char *inet_ntoa(in)
struct in_addr in;
struct in_addr inet_makeaddr(net, lna)
int net, lna;
int inet_lnaof(in)
struct in_addr in;
int inet_netof(in)
struct in_addr in;
Description
The routines and each interpret character strings representing numbers expressed in the Internet standard "." notation, returning numbers
suitable for use as Internet addresses and Internet network numbers, respectively. The routine takes an Internet address and returns an
ASCII string representing the address in "." notation. The routine takes an Internet network number and a local network address and con-
structs an Internet address from it. The routines and break apart Internet host addresses, returning the network number and local network
address part, respectively.
All Internet address are returned in network order (bytes ordered from left to right). All network numbers and local address parts are
returned as machine format integer values.
Internet Addresses
Values specified using the "." notation take one of the following forms:
a.b.c.d
a.b.c
a.b
a
When four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an Internet
address. Note that when an Internet address is viewed as a 32-bit integer quantity on the VAX, the bytes referred to above appear as
"d.c.b.a". That is, VAX bytes are ordered from right to left.
When a three-part address is specified, the last part is interpreted as a 16-bit quantity and placed in the right most two bytes of the
network address. This makes the three-part address format convenient for specifying Class B network addresses as "128.net.host".
When a two-part address is supplied, the last part is interpreted as a 24-bit quantity and placed in the right most three bytes of the net-
work address. This makes the two-part address format convenient for specifying Class A network addresses as "net.host".
When only one part is given, the value is stored directly in the network address without any byte rearrangement.
All numbers supplied as "parts" in a "." notation may be decimal, octal, or hexadecimal, as specified in the C language (i.e. a leading 0x
or 0X implies hexadecimal; otherwise, a leading 0 implies octal; otherwise, the number is interpreted as decimal).
Return Values
The value -1 is returned by and for malformed requests.
See Also
gethostent(3n), getnetent(3n), hosts(5), networks(5)
inet(3n)