Looks like one reponse I made to this post dissapeared. It would be (47+1) -16 =32
256/32 =8
so 255.255.8.0
That is a weird one. If it went to 192.164.232.55 it would be (232-228) +1 =5
256/5 = 51.2 or 52
and that would be 255.255.52.0.
my guess with it ending in .95 wold be
256/95 = 2.6 or 3
so my best guess would be 255.255.52.3
255.255.86.6
The NIC registry sites I have seen only list APNIC, RIPE, and Arin. Some African sites would come througth RIPE, if they get their connectivity from European ISPs, which some of the larger African providers do.
OK on math - but not relevant here. Masks operate off binary math, so you would convert the IPs to binary and look at that.
208.138.16.0 1101 0000 1000 1010 0001 0000 0000 0000
208.138.47.255 1101 0000 1000 1010 0010 1111 1111 1111 ^^^^ ^^^^ ^^^^ ^^^^ ^^ and then notice what bits did NOT change - that's the mask. The kicker here is that the first 18 bits do NOT change, but bit 19 does and bit
20 does too, but in the opposite direction to bit 19. This can't be an acceptable mask. In fact, most operating systems would require two masks, which is to say, two networks.. See RFC1878 As this situation normally only occurs on external routing, it's no big deal, as you just send the packets for both networks to the same router. You should never seen a setup this difficult on a home system, and most professionally designed networks would avoid it but in very rare circumstances.
Who ever taught you that should be shot. The only correct values are
Yeah, I'd guess that 193.164.232.0 to 193.164.232.95 is either public or DMZ, and the rest is their internal net with more restricted access, but that is purely a guess.
I've no idea what you are trying to do, but it has nothing to do with calculating masks. Again, this is a bizarre one that takes multiple masks - 3 in this case (255.255.252.0 and 255.255.255.192 and
255.255.255.224.
LACNIC was added as a RIR in 2002.
That has nothing to do with it. It's basically when they got their registrations. Some countries even have them from both RIPE and ARIN. The "border" is supposed to be the Sahara, but Nigeria gets assignments from RIPE, and Niger (look at the map) gets it from ARIN. If you read between the lines in RFC2050, if _infers_ that there will be an RIR for Africa eventually.
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