Answer / karn

AF stands for Address Family
PF for Protocol Family

Answer / hakim ali

there is no difference b/w AF_INET & PF_INET ...both have same interger value...

Answer / neenz

In some documentation, you'll see mention of a mystical "PF_INET". This is a weird etherial beast that is rarely seen in nature, but I might as well clarify it a bit here. Once a long time ago, it was thought that maybe a address family (what the "AF" in "AF_INET" stands for) might support several protocols that were referenced by their protocol family (what the "PF" in "PF_INET" stands for).
That didn't happen. Oh well. So the correct thing to do is to use AF_INET in your struct sockaddr_in and PF_INET in your call to socket(). But practically speaking, you can use AF_INET everywhere.

Answer / aymlord

it is a hitorical differnce,
that the first one supports the ipv6 and the second dosen't.

Answer / anil jagtap

There is no difference between AF_INET and PF_INET just as
AF_PACKET == PF_PACKET.
The confusion because of some stupid naming standards(?)

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