This domain is used by Clonable's infrastructure.
Feel free to contatct us if you have questions about (traffic coming from) servers which have a PTR record pointing to cinfra.net:
Contact: security@clonable.net
We kindly ask you not to add our servers to a block list if abusive traffic is originating from it, but to instead contact us so we can take action on our side to prevent this traffic from passing through our service.