Is there some way an ISP can tell an RBL how it's split up it's internal IP address space? For example, our Linode's ipv6 address is on the Spamhaus XBL, but it's the entire /28. (Thanks Tobias for prompting me to check this!)
Anyway, it got me wondering, is there some way an ISP such as Linode can communicate to Spamhaus how it carves up it's large swatches of addresses? Or does this somehow happen automatically over time as I as a customer delist my single /128 address in their database? In the case of Spamhaus, I tried to delist my address and the delist page says I need to make sure the problem in 2600:3c02::/32 has been resolved. When I do a whois lookup on my ipv6 addr, Linode is responsible for the entire /28 yet Spamhaus seems already to have split that up down to the /32 level, yet really it probably should be split down to the /64 and in some cases /56 level. I was curious, does this happen and how? Is there some internet database that keeps track of how smaller swatches of the address space are actually carved up? Smaller than what whois reports. To be clear, I'm talking about how the address space is split up, NOT the actual customer like whois reports. Barring that, is there some way to tell Spamhaus how the address space is carved up so I can communicate that to Linode? I looked but didn't see anything obvious. Michael Grant
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