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What is IP Address 169.254.X.X?

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Sometimes I have no internet access and when I check my local IP, i see 169.254.X.X (X = some random number).
asked Mar 10, 2016 by anonymous
retagged Mar 10, 2016 by learnipaddress

2 Answers

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Best answer

According to RFC 5735: 

169.254.0.0/16 - This is the "link local" block.  As described in
   [RFC3927], it is allocated for communication between hosts on a
   single link.  Hosts obtain these addresses by auto-configuration,
   such as when a DHCP server cannot be found

 And RFC 3927 Section-1:

   This document describes a method by which a host may automatically
   configure an interface with an IPv4 address in the 169.254/16 prefix
   that is valid for Link-Local communication on that interface.  This
   is especially valuable in environments where no other configuration
   mechanism is available.  The IPv4 prefix 169.254/16 is registered
   with the IANA for this purpose.  Allocation of IPv6 Link-Local
   addresses is described in "IPv6 Stateless Address Autoconfiguration"
   [RFC2462].

Then, 169.254.0.0/16 is Link-Local Communication IP block that Operating System uses when there is no other IPv4 address assigned manually or by DHCP.

answered Mar 10, 2016 by anonymous
selected Mar 20, 2016 by learnipaddress
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This will occur when your router cannot give you a local IP, so Your Operating System like Windows, iOS, Android or whatever, will give you an IP Address in range 169.254.0.0 - 169.254.255.255.

So, whenever you see this IP Address, just check your router and make sure DHCP Server is enabled.
answered Mar 10, 2016 by anonymous
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