I've had no problem dealing with their noc on these sort of issues in the past. On 18 Jan 2018 10:54, "Youssef Bengelloun-Zahr" <bengelly at gmail.com> wrote: > Dear Nanog community, > > I have an issue with a client trying to reach an IP that has been > blackholed on Cogent backbone for shady "security reasons". > > Can someone reach out in MP please ? > > Thank you. >