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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.
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