Import netstat from 4.4Lite-2 - this version eliminates some of the
    severely bogus mask guessing in the netname code, and also reports the
    mask length of the route (like linux's netstat, but in a much more compact
    form)
    
    The current code is doing bogus things like shifting c-class subnets by
    4 bits and looking them up, causing a DNS lookup of 0x0C0CBxxx which
    takes an eternity to fail.