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nedman470's avatar
New Contributor

unknown mac addr appears after modem reset

my modem did a spontaneous reset today and when it came back I had a new device:

mac addr = 02:99:99:xx:xx:xx

02:99:99 is not a known vendor code

the lower part was only one digit away from the lower part of the mac address of the router

the ip address was

i logged into the modem and saw 252 was a reserved client ip

i called cox. they claimed not to know anything about it

i'm writing to this forum to see if anyone has had a similar experience

thanks in advance

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  • The purpose of the Cox Internet Forum is to allow customers to discuss technical topics related to residential Cox Cable, Telephone and High Speed Internet services with other customers. This appears as if you may need for someone to look into your account personally.  We can definitely be able to assist you with this.  Please reach us on Twitter at @CoxHelp, visit us on Facebook, or email by at Provide us the name on the account with the full service address with a link to this thread so we can get started.

  • nobody00's avatar
    New Contributor

    .252 is the address for the usb port on the back of the router. The port was activated with the last firmware update.