ISP IP vs. Host IP vs. Router IP - How Can i Get Where My Host is Located via IP Address?

F-J-K used Ask the Experts™
1. If i'm behind a network/LAN/NAT, the IP that is publicly tracked via Website/Email header belongs to my ISP. In other words, this public IP reveals which ISP i'm registered with. Right?

2. As known a Dial-Up connection assign me a public IP directly to my PC, so if somebody tracked my IP, he/she would spot almost my exact location/address. Right?

3. If i have a home LAN which has a router box and all my hosts are connected to this router, then obviously i would have an IP address that explicit to everybody so i can get incoming/outgoing connections. Now if a user track this router's IP, the user will be able to track where my router is which resides inside my home/where i live, so what about the ISP Public IP? Which one will be considered as a Public IP. Since i'm registered with an ISP + my hosts are behind a router. Tracking my Public IP would track to which location? my ISP or my Router's box? I'm little confused about this, can you please explain.

4. If somebody could locate your ISP, can he/she get spot the address where you living without contacting the ISP?

5. Does the ISP client has to be located/living where the ISP is? For example, if ISP is located on Houston, TX, does this mean the client live in Houston, TX? or the client could be living in Washington, DC whereas the ISP is located Houston,TX?

My questions based on assumption that a client is using either Cable or Wireless. I think they follow the same rules for IP distributions.
I tried to make my questions clear and easy to grasp. I'm looking forward to hearing from you.

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SoulwinnerIT Manager
- By using icmp or udp packets with increasing TTL values (tracert or pathping) you can trace the route to a certain ip address.

- By using hostname translations, BGP numbers database and public whois servers ans some preprogrammed knowledge you can find out where each router is located.

There is no way that you can be sure of a location of a certain ip address.  But you make the assumption that the host is located near the last router.
With your IP address, someone can tell who your ISP is.

They can't tell exactly where you are, however, from just your IP address.  The best they can do is get your general neighborhood, by using the sort of information saul2paul refers to.

If they wanted to find out your identity/address, they'd need to subpoena your ISP.

SteveNetwork Manager
yes. Dont believe a thing they do on the TV.. :) It always cracks me up on NCIS when they 'backtrace' an IP address and can tell the users actual address / contact numbers etc.. all rubbish. As the guys above stated, they'd have to go through your ISP to get that information.

I know that as an ISP we've been asked once in 10 years by the police for information on an IP address. and when we requested a court order they never got back to us.

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This one really depends on ISP.  Some of the ISPs do some kind of proxy to filter your traffic and some ISPs give private IPs which are then translated to public IP on their site to properly route things.  You can just go to to check your public IP but this doesn't mean that everyone can see this and you're the only using this Public IP.  Just to answer your questions.

1.  Yes
2.  No, Public IPs need to be registered (if it is static) to the owner, usually it is registered under your ISP address/exact location.
3.  If your ISP gives out public IP for this, the header will contain the public IP of your router.  But if your ISP NAT/Proxy your traffic, then the server will only detect your ISPs public IP
4.  If you register the IP address range and the registration shows that you're the owner of the IP address. Usually they do a reverse dns lookup to find out these infos.
5.  Usually I think that's the case.   This is depends on the area of the ISP and also the range of the media they used.


Thanks! Your responses helped me, so either way, i will have to go through an ISP.



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