Greetings, <flame_suit_on> This may seem like a stupid question, but in IPV4 there are a few "reserved" bits which I've not seen used, but perhaps I am behind the times. With regard to these, what if one was to use such to delegate a second venue of IP space? In otherwords flip a bit in the flags reserved < http://www.networksorcery.com/enp/protocol/ip.htm#Flags > and now its considered IPV4.2 ... Would that not give a second range of IP address space to use? Granted there would be a ton of upgrades/updates to enable such, but sounds a little bit simplier than an IPV6 upgrade, maybe? I am on the fence regarding IPV6 as there have been many logical arguments pro and con regarding its deployment. I still have to wonder about these "reserved" bits, that seem never to be used, why not use them? Again perhaps I am behind the times and all of the bits are being used. Just my 2 cents. </flame_suit_on> Kind regards -Joe