How to find IP?

AvinashSam · 02-26-2015, 11:45 PM

How to find another PC IP address not in a LAN or WAN network... I mean how to find others IP address during chatting like fb or others

pan64 · 02-27-2015, 12:57 AM

ask the user on the other side to check it. But it highly depends on the OS.

273 · 02-27-2015, 05:49 AM

Simple answer: You can't.
More complex answer: Which IP address, the public IP address of their network or network local? In most situatuions nowadays these are different.
What I would do to find the public IP: Post a picture that only they can see which is hosted on a machine I control and check the logs for the IP address which opened it.
Of course, I have to ask why you would want to do this?

AvinashSam · 03-01-2015, 02:56 AM

just to know only others IP

salasi · 03-01-2015, 03:00 AM

That avoids being an answer to the question 'Which IP address' by quite some distance.

I'm not sure what you intend doing with this, but you probably can't do it.

273 · 03-01-2015, 03:01 AM

Quote:

Originally Posted by AvinashSam

just to know only others IP

You have been given two options that work -- ask the person for their IP address or embed an image or other resource in a web page from a server you control.
There are no other ways. You cannot generally determine another persons IP address from something like Facebook.
Perhaps if you expanded on what you are trying to achieve and why there would be a more suitable answer somebody can give.

JeremyBoden · 03-01-2015, 09:03 AM

You could run something like wireshark - a low level protocol analyzer.
Provided you have a direct person-person connection (no proxies, facebook, twitter etc) this would work.

But only to the extent of giving you their current public-facing IP address of their LAN.
This address is liable to change at the whim of their ISP.

The distant person is probably behind a NAT router, with a non-routable address.
For example, my local ip address is 192.168.1.7 - but you can't find that out.

273 · 03-01-2015, 09:07 AM

It did occur to me that IRC gives out the public-facing IP address of everyone as they join -- so that could be used.
Again, though, as mentioned above this is the public facing IP only and may be subject to change at any time. Though I found my ISP gave me the same IP address for over 5 years and it only changed recently when I got a new MODEM. Of course, my phone can change IP address one minute to the next in extreme circumstances.

JeremyBoden · 03-01-2015, 10:21 AM

You could use geo-location lookup to discover the vague location of the remote person.

273 · 03-01-2015, 11:21 AM

Quote:

Originally Posted by JeremyBoden

You could use geo-location lookup to discover the vague location of the remote person.

Indeed. I hate IRC for broadcasting my IP for that reason, amongst others. I've found, from using IRC and checking server logs, that geolocation tends to be accurate enough to give the town a person is located in as long as they're using a home ISP. Of course, at work I browse through another city and on this mobile device I tend to connect through Canada and often get served google.nl.