Companies using public IP space owned by others for internal routing

Bryan Holloway bryan at
Tue Dec 19 23:03:36 CST 2017

Comcast, at least in my neck of the woods, hands out /56s.

On 12/19/17 4:03 PM, Grant Taylor via NANOG wrote:
> On 12/19/2017 01:55 PM, William Herrin wrote:
>> Providers assigning a single /64 or a /128 to an always-on customer are
>> doing it wrong. You know who you are.
> The cable ISP that I had (prior to moving) assigned a single /64 for the 
> outside of the router.  I could also request provider delegation for 
> something that I could use internally breaking into multiple /64s.  I 
> just don't remember if it was a /56 or /60.
> The point being that the outside of the SOHO router and the inside PD 
> were two different DHCP processes, both of which needed to happen.

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