CZ.NIC provides basic support for the latest version of Knot Resolver for free on a best effort basis via the mailing list and the issue tracker.

We understand that there could be a need for a formal support contract or perhaps you just want to help the Knot Resolver development. Therefore we offer several support programmes listed below. If you are interested, please contact us via

It is also possible to sponzor development of particular features. Please send your proposals to us via

Support levels

Bronze Silver Gold Platinum
Yearly fee (EUR) 5 000 10 000 20 000 50 000
Number of servers 2 10 unlimited unlimited
Response time NBD 12 hours 6 hours 3 hours
Resolution time (hours) 96 72 24/48/72 24/48/72
Early notifications yes yes yes yes
Prioritized development no no yes yes
Phone support no no yes yes
Chat support no yes yes yes
E-mail support yes yes yes yes
Consultancy (hours) 8 24 72
On-site support no no no yes