Refer from [IANA #937566] :
IANA "Mac assigned mistakenly managed by IEEE; IPs wrongly assigned on vista specially range by vista maker "
*** Here IANA indicating manufacture vista is the computer system or Microsoft os shall be contacted ?
The DUID having been used by two of above they who mistakenly assigned IPs on the vista conserving IP ranges . [RFC 1918 where point accessed into ] ? see the screenshot. The other hand, detectable running DHCPv4 mac 1 , and with DHCPv6.DUID mac 2 is one intruder device device ( ipconfig/ all there are two mac address on two dhcp server)
The modem.isp changed times could not be able to modify or taken back the gateway address for the connectional device , the unknown mac device by arp detected . It not modem , not router nor any mine peripherals .
Both of ips or router vender in case if would not make this wrong connection and unsupportable be corrective, [Cisco, dhcp via automatically can do nothing, isp fiber opt modem no wireless offering] Internet Engineering Force or any other organizations or associations would take account on this reporting ?
Please help or advise where right place forwarded to take account of this which followed all about around connections years.
Any questions you have about the use of addresses in Vista should be directed to the manufacturers of Vista.
The IETF produces standards documents. It is not a regulator.