Comcast cust cannot reach Chris Boyd's IP x.x.x.x (was Problem from Comcast Network to The Planet)

[Routing Bits <routingbits () gmail com>]

> Message: 7
> Date: Fri, 5 Mar 2010 17:40:45 -0600
> From: Chris Boyd <cboyd () gizmopartners com>
> Subject: Re: Problem from Comcast Network to The Planet
> To: nanog () nanog org
> Message-ID: <5DF52A7E-7288-433B-8B08-EA9530B29400 () gizmopartners com>
> Content-Type: text/plain; charset=us-ascii
>
>
>
> I don't know what's going on in the Comcast network, but I've been having
> similar fits with a single IP address in my network.  Comcast can get to
> nearby IP addresses in the same /24 no issue.  The Comcast customer in my
> case is in Florida, and I get to them via TWTelecom.
>
> I know it's not my net, and TWT was very helpful and knows it's not their
> net.
>
> Attempts to get Comcast to look into it seem to end with them pinging their
> customer's IP address from the Comcast support center and terminating the
> call "since they can reach them."

--Chris

Chris,

Maybe Comcast abuse is blackholing the host?  What is the host IP?  Is it
more than one Comcast customer unable to reach that host?  What is the IP of
the Comcast customer(s) unable to reach it?  What do traces from the host to
the customer and from customer to host look like?