dnswl.org limits the use of the public nameserver infrastructure to those doing fewer than 100’000 lookups per 24 hours and to non-commercial use (see here for details).
In the past years, we have not been very strict in enforcing these limits. Some users have been constantly ignoring the limits and the warnings we sent out once in a while in an approach of “soft enforcement”.
Since this did not really improve the excessive load generated by some users, we will now move to a more “strict enforcement” mode. We will send out warnings if the IPs of nameservers can easily be traced back to a responsible party. However that is often not the case – in these situations, we will simply turn off access to our public infrastructure for those who repeatedly ignore our warnings.