My machine, running 4.99.3 with net.inet.ip.random_id=1

TCP Sequence Prediction: Class=random positive increments
                         Difficulty=4365376 (Good luck!)
IPID Sequence Generation: Randomized
Service Info: OSs: NetBSD, Unix

NetBSD.org

TCP Sequence Prediction: Class=truly random
                         Difficulty=9999999 (Good luck!)
IPID Sequence Generation: Busy server or unknown class
Service Info: Hosts:  narn.NetBSD.org, rt.NetBSD.org; OS: NetBSD