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Community Member

Loopback

hello there

127.0.0.1..... what is the use of this IP address?

can anyone tell.. pls

7 REPLIES
Cisco Employee

Re: Loopback

It's a loopback ip address. If you need to access some application within your host via ip address, you can use that loopback address.

Example: if you are hosting web on a server, and would like to test the website from the host, you can browse to http://127.0.0.1

Community Member

Re: Loopback

According to u  this IP address only for the testing purpose... isn't it?

Cisco Employee

Re: Loopback

Yes, absolutely correct. Basically just to check connectivity on the port that you open on your host, and making sure you can access it locally.

Community Member

Re: Loopback

Hi,


This IP is used for Internal network loop testing in a node.

to check whether your LAN card is working or not

Re: Loopback

Correct.

In theory the entire 127.x.x.x is for that purpose.

Federico.

Community Member

Re: Loopback

whether 127.0.0.1 only used  or 127.x.x.x the entire network  are used in that testing purpose ?

Hall of Fame Super Gold

Re: Loopback

The loopback address of 127.0.0.0 is a software construct and does not apply to any physical interface. It helps me when I think of it as an address that a device uses when it wants to talk to itself.

While 127.0.0.1 is frequently used, any of the addresses within 127.0.0.0 can be used for this purpose.

HTH

Rick

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