Frequently-Asked-Questions.md
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@@ -27,4 +27,9 @@ Another issue with the private ASN range 64512-65534: other projects are also us
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Fortunately, [RFC6996](http://tools.ietf.org/html/rfc6996) defines a new private ASN range: 4200000000-4294967294. Given the size of this range, there is little chance of running into a conflict.
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-dn42 is now using the **4242420000-4242429999** range for new allocations.
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+dn42 is now using the **4242420000-4242429999** range for new allocations. This range is further subdivided:
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+* **4242420000-4242423999** for end-users allocations
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+* **4242424000-4242426999** reserved for future use
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+* **4242427000-4242429999** for sub-allocations
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+
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+If you are running a project similar to dn42, please use another range of ASN. The "sub-allocations" range is meant for dn42 users willing to have administrative control over a small, consecutive range of ASN (e.g. to use them directly or to distribute them).
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