How do I find out what someone else's ip address is?
454629
If you don't know how to do this, then surely you have no valid use for having the ip.
178861
Assuming they don't give themselves away by telling someone they did it? Nigh impossible. You would have to find out what ip it was sent from, then hack the isp to find out who was using that ip. Not an easy task for even an expert hacker, and highly illegal. And that would only tell you who pays for the internet service. If they sent it from say, a library, you would then have to somehow find out exactly who was sitting at that pc at that exact time. Basically it would take more time, effort, and skill than anyone is willing to put into it, just to find someone calling them names.
10334
Well if you are useing Yahoo messenger . You cannot  see the persons ip address because you connect to yahoo then the person.\n\nExample; You / ip. - Yahoo Server - Other ip\n\nThe only way is if you are transforing files to each other. So why you are doing that , pop open a dos window ( cmd in the run box ) and type netstat -an.\n\nThat will list there ip address
412253
try using a proxy, or try the program hide ip, do a search for them..
172660
Just the ISP (ISP of the person) can tell you at a specific time which phone number was using a specific IP.\n\nBut they will not reveal their users private info to you, therefore it is almost impossible.
1056701
If you are running Windows XP, click Start, Run..., and type in cmd in the dialog box that appears.  This will open a DOS session.  Type ipconfig at the command prompt that appears on the screen and press <Enter> key.  You will get a few lines of results, one of them being your IP addr.\n\nNow, if you have a router between you and and your cable or DSL connection, then the IP address you see is what the router is assigning to your computer.  The outside world cannot see that address - they see the address your service provider has assigned to your router.
319778
ping -a <ip address>\n\nTo query a specific DNS server use NSlookup from command line then do a ls for PTR records.  Or use an online IP whois tool.
141551
Another way is to find out what the IP address of your computer is, then compare it to the number on whatismyip.com (I find this to be easier).  If you're using Windows XP, just double-click your Local Area Connection in Network Connections --  your computer's IP address is on the Support tab.
754861
I don't think the serial number will help you.  However, if you've got passwords on that computer for message boards and maybe some notable sites you log in to you might be able to track down the ISP of someone who's using them.  Ask those sites if your account has been logged into lately and if so, ask them for the IP number.  Then you'll have to contact the ISP that IP number belongs to, so do a 'who is' search on the IP number.  Contact the ISP and see if they can help you from there.
542603
Let's start with Planet Earth. \n\nIf you know the domain name, PING it.  \n\nFrom the Command Promt, type\n\nping yahoo.com\n\nThen use a WHOIS service to Look up that IP address to find the OWNER.   That owner probably has the server installed somewhere near their location.\n\nTry \nhttp://www.arin.net/whois/
480152
the only way would be to add a counter/tracker. this won't tell you their name or ip number but it gives you other info. just paste the code they give you in your profile in the safe mode.\n\nhttp://www.sitemeter.com/
1045492
Sorry for the wrong posts that people have told you. \n\nYES you can know the persons ipaddress IF HE emailed you.\nIf he sent you one email, then you could view the headers of that email to see the originating IP of that user. For example if your using hotmail, you can goto settings and enable advanced headers, then when you view his email you could veiw raw email meaning you would see all the header information of that email. Same thing applies for AOL.\n\nYou CANNOT know the ip address if you just have the EMAIL address. Since an email address is virtual. MSN Servers own that so you cannot know his email address unless you two have some sort of communication together. Like chatting, sending emails, sending files, anything that puts you two guys together. By a simple packet sniffer you could acheive that.\n\nGood luck on finding the IP :)
56065
The netstat command can often reveal the state location of anybody that is sharing a P2P connection with you, for example from a simple Yahoo IM or file transfer. Then again, they could be running through a proxy/port redirector, in which case you'd only be getting the proxy's IP.\n\nApart from that, no detailed information can be extracted, without law breaking activities and extensive knowledge.
602999
start > run > cmd > netstat -ano\ninitiate a direct sharing connection thing with the person\nsend a file\nrun netstat -ano again\nuse process of elimination to determine any new IPs in the list (likely on port 5190)\nyou now have their IP address\n\nrun   tracert xxx.xxx.xxx.xxx  (replace the x's with the IP address)\n\nthere you go.
922780
in any email client you can click on view>full header.  this will reveal the original ip address of the email.
186599
If its by email, you can turn on a function in your email to see the source IP of the sender.  This IP will at the least tell what ISP he is using.  Keep all the emails and call your local police department's cybercrimes division.  If your municipal department does not have one, contact your county or state police departments.\n\nMore directly if it is possible, yes.  Our IT department does it all the time.  One example of a program is called PCanywhere.  I do believe it has to be installed on both machines and the IP address of the pc you are trying to control must be known.
901063
They can log your externally exposed IP address.  This wont be the same address you see if you're behind a network router (linksys) or something.  If you'd like to know your IP they see, go to www.whatismyip.com.  If you leave a message or comment, if they're smart, they'd be able to associate your page hit with that message time and from then on out, thye'd know that IP address was you.  This might be a problem if you're using dsl, as thats a static connection, and your IP would always be the same.  However, with cable, it uses DHCP so your IP should change pretty frequently i blieve.