We've talked a lot about our I p v four addresses and we've talked about dynamic I p addressing in our default gateway and, ah, lot of the other attributes of I P V four addresses and how they work.
At the very beginning of our I p V four dresses, we mentioned that our I p v for address range gives us about
4.3 billion addresses.
We need more than that.
Um, well, eventually need a lot more than that.
Originally, when I pee before was developed, it was thought, 4.3 billion dresses. This is plenty. This is more than enough, but it turns out
we will probably still need more. We need more. So we're developing something called High P V six. You may see it already on your computer, but it actually technically hasn't been fully integrated yet. We're still mainly using I p v four for addressing and routing,
but I p v six support is on the way once all the regulations and everything finished for it,
and I p B six uses a 128 bit address.
But what does this mean? Well, we mentioned earlier how an I P four address is
eight section eight or four AQ debts. So four sections of eight bits R I p before address written out in
all the bits and bytes. And then rather than doing all the calculations, I assure you that this is not with this equals just two different representations of how I P addresses look.
But that's what we mean when we say that I p addresses a 32 bit address. It has four octet. It's four sections of eight by eight bits, so 32 bit
address I P v six is a 128 bit address, rather than just allowing us with 4.3 billion addresses
actually allows us for 3.4 times
10 to the 38 addresses that tend to. The 38 means that that's 10 with 38 zeros. That's ah
heck of a lot more high P addresses than
R. I P. V six address is written in what's known as Hexi decimal format, which
we talked about Hexi decimal a little bit when we talked about Mac addresses. But Hexi decimal format essentially means that we have zero through F available. So it's zero through nine and then a through F. And it's written in groups of
four of these separated by Coghlan's and there are 32 total. So
instead of there being
four groups of eight bites, there's in a zone. I pee before an I P. V six. There are
eight groups of four Hexi decimal characters. F E 16 colon 1358 Colon And on and on again, there's
eight groups of those four characters in I P 86. As we can see, it's much, much harder to remember than just a single I p address because that's what a single I P V six address would look like this entire
so we can see how it's a lot harder to remember an I. P. D. Six address than ITV four address. But our I P V six addresses they do give us a little bit of help with shortening these any of thes sections of multiple zeroes we can actually abbreviate with
and double colon. This section of double zeros here
could be just abbreviated with
colon and then the rest of the I P v six address our I P V six address. We no longer formally use classes in our system like we don't have Class A Class B, classy et cetera. Just because of the massive amount of
addresses that we have, we don't have to break them up to the classes before we move on. We want to just reiterate that R I. P V six addresses. They're 128 bit addresses
with using Hexi decimal format.
characters total with four characters, each separated by Coghlan's. So if you're asked to identify if a certain address is a possible I P. V four address our I P V six address, just remember that there can't be anything
any letters later than in the alphabet than F. And you can only use your double
colon once there can't use it once in one place and then again later on, because
this colon or the double Collins here,
let us know that we have
missing zeros and he doesn't let us know how many missing zero. So we have to do the math and essentially say OK
out of our entire I p v six address. How how many characters are we missing? And then we can assume that those missing characters are zeros represented by this double colon. Here, if we try to use that somewhere else and then end up with two sets of double zeros, we don't know how many double zeros are in each set
Double Coghlan's, so we only we can only limit ourselves to one double colon per I P V I P v six address.