MR28/MR36 BSSID Calculation

[Emaleun]

Hey guys,

There is a flow in my company that we need to calculate BSSIDs, and we were following this guide (which is no longer up to date).

We encountered a situation with thousands of MR28/MR36 access points (not in the guide), to get the BSSIDs, we have to query the wireless/status endpoint many times, which causes a very slow flow.

Can someone advise how we can calculate the MR28/MR36 BSSID?

Thank you.

[Karsten Iwen]

Support should be able to help here. But the Documentation should also be updated @Hannah-C

[Philip D'Ath]

I think the chances are very slim - but by chance, does the org-wide call return the information?

https://developer.cisco.com/meraki/api-v1/get-organization-devices-statuses/

[Emaleun]

From the API response example, I see that they are not bringing the BSSIDs, am I wrong?

[Ryan_Miles]

The doc was meant to help figure out the BSSIDs before the information became available in dashboard and via the API several years ago.

Because of this the article says "No new BSSID values will be added to this article moving forward".

Pulling the info from dashboard or API shows the patterns used and one can extrapolate from there to apply to any AP base MAC. Bearing in mind the pattern can be different per model and depends on how many radios there are (2 or 3).

[Emaleun]

Hi @Ryan_Miles , thanks for the answer,
To be honest, I think it will be complex to reverse engineer it; I need a lot of examples, and I'm not sure I will do that 100% right.

I greatly appreciate your expertise in this field and your willingness to assist.
Is there any option to get a guide or something?

Thank you,
Emanuel

[Emaleun]

I got some insights (specifically on MR28)
I'm posting it as a picture because it keeps deleting my message because of the table.

[Ryan_Miles · Accepted solution]

Here are a MR28 and MR36. I think my offsets are correct keeping in mind I woke up less than an hour ago and have had maybe 3 sips of coffee. Others perhaps can check my math and hex skills.

MR28
Base MAC	e4:55:a8
	2.4 GHz	1st octet offset	5 GHz	1st octet offset	3rd octet offset
SSID 1	e4:55:a8	no change	e6:55:b8	+ 0x02	+ 0x10
SSID 2	e2:55:a8	- 0x02	e2:55:b8	- 0x02	+ 0x10
SSID 3	ee:55:a8	+ 0x0A	ee:55:b8	+ 0x0A	+ 0x10
SSID 4	ea:55:a8	+ 0x06	ea:55:b8	+ 0x06	+ 0x10
SSID 5	f6:55:a8	+ 0x12	f6:55:b8	+ 0x12	+ 0x10
SSID 6	f2:55:a8	+ 0x0E	f2:55:b8	+ 0x0E	+ 0x10
SSID 7	fe:55:a8	+ 0x1A	fe:55:b8	+ 0x1A	+ 0x10
SSID 8	fa:55:a8	+ 0x16	fa:55:b8	+ 0x16	+ 0x10
SSID 9	c6:55:a8	- 0x1E	c6:55:b8	- 0x1E	+ 0x10
SSID 10	c2:55:a8	- 0x22	c2:55:b8	- 0x22	+ 0x10
SSID 11	ce:55:a8	- 0x16	ce:55:b8	- 0x16	+ 0x10
SSID 12	ca:55:a8	- 0x1A	ca:55:b8	- 0x1A	+ 0x10
SSID 13	d6:55:a8	- 0x0E	d6:55:b8	- 0x0E	+ 0x10
SSID 14	d2:55:a8	- 0x12	d2:55:b8	- 0x12	+ 0x10
SSID 15	de:55:a8	- 0x06	de:55:b8	- 0x06	+ 0x10

MR36
Base MAC	68:3a:1e
	2.4 GHz	1st octet offset	5 GHz	1st octet offset	3rd octet offset
SSID 1	68:3a:1e	no change	6a:3a:0e	+ 0x02	- 0x10
SSID 2	6e:3a:1e	+ 0x06	6e:3a:0e	+ 0x06	- 0x10
SSID 3	62:3a:1e	- 0x06	62:3a:0e	- 0x06	- 0x10
SSID 4	66:3a:1e	- 0x02	66:3a:0e	- 0x02	- 0x10
SSID 5	7a:3a:1e	+ 0x12	7a:3a:0e	+ 0x12	- 0x10
SSID 6	7e:3a:1e	+ 0x16	7e:3a:0e	+ 0x16	- 0x10
SSID 7	72:3a:1e	+ 0x0A	72:3a:0e	+ 0x0A	- 0x10
SSID 8	76:3a:1e	+ 0x0E	76:3a:0e	+ 0x0E	- 0x10
SSID 9	4a:3a:1e	- 0x1E	4a:3a:0e	- 0x1E	- 0x10
SSID 10	4e:3a:1e	- 0x1A	4e:3a:0e	- 0x1A	- 0x10
SSID 11	42:3a:1e	- 0x26	42:3a:0e	- 0x26	- 0x10
SSID 12	46:3a:1e	- 0x22	46:3a:0e	- 0x22	- 0x10
SSID 13	5a:3a:1e	- 0x0E	5a:3a:0e	- 0x0E	- 0x10
SSID 14	5e:3a:1e	- 0x0A	5e:3a:0e	- 0x0A	- 0x10
SSID 15	52:3a:1e	- 0x16	52:3a:0e	- 0x16	- 0x10

[Karsten Iwen]

Oh, and I realize that the BSSID Details in the dashboard are not correct. I am connected to a BSSID ...63:07:ee:dd, but based on the dashboard it should be ...63:07:ee:d0.

[aleabrahao]

Isn't it simpler to use a Wifi spectrum analyzer?

[aleabrahao]

Have you checked this discussion?

https://community.meraki.com/t5/Wireless/Meraki-MR-BSSID-MAC-Calculator/m-p/32358#M5129

[Emaleun]

Yep, he doesn't have MR28.