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)