I have noticed from my macbook a new hostname is exposed with the name
even if I block this mac address on the router, it comes up with a new one. And do not have any clue where is it coming from ?
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A bogon is an illegitimate IP address that falls into a set of IP addresses that have not been officially assigned to an entity by an internet registration institute, such as the Internet Assigned Number Authority (IANA). Bogons arise as a result of a misconfiguration or intentional misuse that fools recipients about its source IP address. The term bogon is used as slang and is derived from the word bogus.
Prevention of bogons.
Many internet service providers (ISP), firewalls and intrusion prevention systems block bogons. This can be accomplished through bogon filtering, or the practice of assigning access control lists (ACL) or Border Gateway Protocol (BGP) blacklists to a device. A list of bogons can be obtained from a variety of sources including HTTP, BGP peering, routing registries and the DNS.
This is not an unusual problem and much has been written about it here, here and here. These are commonly found as the source addresses of DDoS attacks. I don't know enough about them to do more than refer you to these sites. There are ways to prevent these from showing up on your machine.
a Google search on Bogon returns many other sites with helpful information.