How to find the IP address of a company?

There are several visitors to our website and most of them are very small companies. Would it be possible to find the IP address for each of these companies and then know the names of these companies as well?

How accurate would it be?

How do I do this?
smuralisankarAsked:
Who is Participating?
 
JohnBusiness Consultant (Owner)Commented:
You can probably get 3/4 of the companies this way. There is no way to know, but just in my experience with Whois, 3/4 sounds reasonable.
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Guy LidbetterCommented:
Hi there,

Your web logs should tell you the source IP of any visitors requesting pages. If you ran a a reverse lookup of the IP you might get a hit on the company.

You could also use websites like http://www.ip-tracker.org/ to see if the IP is registered to a specific company. However... if a company is hosted by a managed service in a co-location, the IP you end up with would most likely be the hosts... not the company you're looking for, and this is more likely with smaller companies.

Regards

Guy
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JohnBusiness Consultant (Owner)Commented:
First a company may well have more that one IP address. Except for technical reasons (one client issue I know of), it is usually not necessary to know a company's IP addresses (plural).

You can use a WHOIS web site, or Smart Whois (tamosoft.com) to look up a domain and see what IP addresses are associated with that domain.
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Guy LidbetterCommented:
One other thing to consider is, very small companies often use an ISP (ADSL) for there internet connections out of an office... unless they specifically pay for a static address to this lease with a public A Record, you will only get the ISP as a registered owner...
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smuralisankarAuthor Commented:
if a company is hosted by a managed service in a co-location, the IP you end up with would most likely be the hosts... not the company you're looking for, and this is more likely with smaller companies.

Is there a way around this?

Are all the Ip and reverse mapping from the public registry?

First a company may well have more that one IP address. Except for technical reasons (one client issue I know of), it is usually not necessary to know a company's IP addresses (plural).

Are you talking about dynamic IP?

One other thing to consider is, very small companies often use an ISP (ADSL) for there internet connections out of an office... unless they specifically pay for a static address to this lease with a public A Record, you will only get the ISP as a registered owner...

Is there a workaround?
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JohnBusiness Consultant (Owner)Commented:
Your questions are not in order.

A company may have more than one external IP address for a variety of reasons. So there may not be a one to one mapping between company and IP address. No, I am not talking about dynamic IP.

If a company is underneath a registered owner (co-location), you may not be able to relate company and IP address - no way around that.

Why do you care what IP address a company has?  You can usually map an IP address back to an ISP or company (not always in the case of some spammers).
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smuralisankarAuthor Commented:
Why do you care what IP address a company has?  You can usually map an IP address back to an ISP or company (not always in the case of some spammers).

We would like to know which companies visit our website and then reach out to them.
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JohnBusiness Consultant (Owner)Commented:
Thanks. Most of the time, but not always, you can find the company from the IP address. It just will not always work.
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smuralisankarAuthor Commented:
Ok. Thanks.

If I follow maybe a few methods to get as many as possible, what percentage do you think I can find out ?
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smuralisankarAuthor Commented:
That sound good enough to be honest. Just need to weight it against the cost, time and effort.

Thanks
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JohnBusiness Consultant (Owner)Commented:
@smuralisankar  - Thanks and I was happy to help.
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