Address conversion functions

IP addresses often need to be given to a socket application in character (string) format. It is also common for socket applications to need to display IP addresses in string format. The following functions work for IPv4 and IPv6 addresses:

inet_ntop: Convert a binary IP address (either IPv4 or IPv6) into string format.
inet_pton: Convert an IP address in string format to binary format.

The functions inet_ntoa and inet_addr are still available, but they cannot be used for IPv6 addresses.

Table 1. Address conversion functions
Function	z/OS® UNIX Assembler Callable services	C/C++ using Language Environment®	IP CICS® C sockets	REXX	Socket Extended macro/call (includes CICS EZASOKET)
inet_pton	No	Yes	Yes	No	No
inet_ntop	No	Yes	Yes	No	No
PTON	No	No	No	No	Yes
NTOP	No	No	No	No	Yes