VMS Help TCPIP Services, Programming Interfaces, Sockets API, getnetbyname(), Errors  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    EFAULT             The buffer described by name is not a valid,
                       writable part of the user address space.
    EINVAL             The net or net_data argument is invalid.
    ESRCH              The search failed.