I'm temporarily at a loss as to how to prevent. Blocking the IP address would only be a temporary "fix" since the persistence of the spammer is already demonstrated. You could ban the whole range, like putting 142.0* in your IP ban list. But like I said, IPs are easy to spoof anyway.
It might be helpful to see if the User Agent string being used is constant, and if it contains some unusual variable, for blocking purposes.
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