Use cases (examples) ==================== Dynamic DNS Service discovery (DNS-SD_) ------------------------------------------- Synchronized with database engine, for example *MySQL*. .. _DNS-SD: http://www.dns-sd.org/ Firewall control ---------------- Control firewall (e.g. enable incomming SSH connection) with DNS query signed with private key. So firewall can blocks every service during normal operation. Scriptable DNS-based blacklist (DNS-BL_) ------------------------------------------- Scripted in Python with already provided features, takes advantage of DNS reply, because almost every mail server supports DNS based blacklisting. .. _DNS-BL: http://www.dnsbl.org DNS based Wake-On-Lan --------------------- Controled by secured queries secured with private key. Dynamic translation service --------------------------- DNS request can be translated to virtualy any answer, that's easy to implement in client side because of many DNS libraries available. Examples : * **Dictionary** - using *IDN* for non-ascii strings transfer, ``dig TXT slovo.en._dict_.nic.cz`` returns translation of "slovo" to EN. * **Translation** - Extends *DNS-SD*, for example DNS to Jabber to find out people logged in. * **Exchange rate calculator** - ``dig TXT 1000.99.czk.eur._rates_.nic.cz`` returns the given sum (1000.99 CZK) in EURs. Dynamic ENUM service -------------------- Support for redirection, synchronization, etc.