# LoRaWAN duty cycle abuse

**URL:** <https://www.thethingsnetwork.org/forum/t/lorawan-duty-cycle-abuse/5945>\
**Category:** LoRaWAN Discussions\
**Created:** [March 9, 2017, 9:47am UTC](https://www.thethingsnetwork.org/forum/t/lorawan-duty-cycle-abuse/5945 "2017-03-09T09:47:28Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [March 11, 2017, 12:23pm UTC](https://www.thethingsnetwork.org/forum/t/lorawan-duty-cycle-abuse/5945/5 "2017-03-11T12:23:23Z")

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I don’t see why blocking/blacklisting would help (unless the gateway is on some metered connection).

If the DevAddr is a TTN address ([starting with the hexadecimal `0x26` or `0x27`](https://www.thethingsnetwork.org/wiki/LoRaWAN/Address-Space)) then it would be nice if TTN can block this; this would be a good use case for the Fair Access policy.

If the DevAddr is not TTN, then assuming the gateway forwards to TTN, then the packet will be dropped anyway. So filtering in the gateway has no effect.

The most significant 7 bits of a DevAddr are known as the NwkID, and match the _least_ significant 7 bits of the NetID (network identifier). TTN currently uses NetID `0x000013`, hence its NwkID is the binary `%0010011`.† I assume there is some overview of assigned NetIDs or NwkIDs, so we might be able to match the 7 MSB of the abusive DevAddr to one or more specific LoRaWAN networks, and complain there.

So, to repeat the question:

> [@cambierr](#):
>
> Is there any way to report this kind of abuse ?

(As an aside: a hardcoded SF11 [is not allowed either](https://www.thethingsnetwork.org/forum/t/can-i-register-an-abp-device-that-has-fixed-devaddr-nwkskey-and-appskey/3831/16), so their provider should take some action…)

* * *

† Just to verify: hexadecimal `0x26` is binary `%00100110`, and `0x27` is `%00100111`, so both indeed start with the 7 bits NwkID.

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