What is the IP address that starts with 169

Why is the Windows default IP address 169.xx.xx.xx?


My Windows system recently got an IP address and I fixed the problem. Why did Microsoft choose this address as the default address?

Why not right? Said someone at Microsoft

Hey pick a number from 1 to 255 ... who just said 169 ?! OK, we'll go with that for our Windows default IP address.






Reply:


It's not MS, it's ISOC ;-)

See the reserved IP address RFC 5735 under IPv4 for special purposes: here

169.254.0.0/16 - This is the "Link Local" block. As described in [RFC3927], it is assigned for communication between hosts on a single link. Hosts get these addresses through automatic configuration, e.g. B. if no DHCP server can be found.







The use of 169.xxx addresses is defined in a standard that is colloquially known as APIPA (Automatic Private IP Addressing).

To cut a long story short: If a network device has not been assigned a fixed (static) address and it cannot obtain it by request (DHCP), the device says to itself: "Well, I should think of my own address so that I can use it Network ", it assigns itself an APIPA address that starts at 169.254.0.1 and runs to 169.254.255.254.

If you suddenly find that your computer has an address within the AIPIA range, it usually means that the device on the network that is issuing the addresses (the DHCP server) is unreachable for some reason. The device may be switched off or the network cable may be disconnected.



To rephrase Dan M's answer, your DHCP server has a problem and cannot assign an IP address. When Windows and other operating systems are configured to get an IP address through DHCP and not get one, they automatically assign the IP address 169.254.xxx.xxx


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