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ip-address interview questions

Top ip-address frequently asked interview questions

Find the IP address of the client in an SSH session

I have a script that is to be run by a person that logs in to the server with SSH.

Is there a way to find out automatically what IP address the user is connecting from?

Of course, I could ask the user (it is a tool for programmers, so no problem with that), but it would be cooler if I just found out.


Source: (StackOverflow)

Most efficient way to store IP Address in MySQL

What is the most efficient way to store and retrieve IP addresses in MySQL? Right now I'm doing:

SELECT * FROM logins WHERE ip = '1.2.3.4'

Where ip is a VARCHAR(15) field.

Is there a better way to do this?


Source: (StackOverflow)

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What services can I used to find a user's location based on their IP address?

If you need to locate a user based on their IP address, what services are available (free and not free services are fine)?

P.S. I understand that some users use proxies etc., that means the result is not 100% accurate. That's ok.


Source: (StackOverflow)

Get IP address of visitors using Python + Flask

I'm making a website where users can log on and download files, using the Flask micro-framework (based on Werkzeug) which uses Python (2.6 in my case).

I need to get the IP address of users when they log on (for logging purposes). Does anyone know how to do this? Surely there is a way to do it with Python?


Source: (StackOverflow)

Get the client's IP address in socket.io

When using socket.IO in a Node.js server, is there an easy way to get the IP address of an incoming connection? I know you can get it from a standard HTTP connection, but socket.io is a bit of a different beast.


Source: (StackOverflow)

How do I get the user IP address in Symfony2 controller?

I need to store the IP address of the users who comment, in the database after form submission.

Is there any symfony2 function to get the IP? Or any other way to get the IP?


Source: (StackOverflow)

PHP how to get local IP of system

I need to get local IP of computer like 192.*.... Is this possible with PHP?

I need IP address of system running the script, but I do not need the external IP, I need his local network card address.


Source: (StackOverflow)

Rails: Get Client IP address

In Rails 2.3.2, what's the best way to get the ip address of the client connecting to the server?

Here are two ways I've found:

request.remote_ip
request.env['HTTP_X_REAL_IP']

Source: (StackOverflow)

How to get IP address of the device?

Is it possible to get the IP address of the device using some code?


Source: (StackOverflow)

Access XAMPP Localhost from Internet

I have XAMPP installed in local laptop. And I have a almost static ip. I would like to give the ip to other to run it from thier browser. I configured apache httpd-vhosts.conf to listen my ip address:80 and added the virtual server with the ip address and domain root to local httdocs directory and the servername as localhost. Apache doesn't start. what should I do to access my website from external computer. THnks


Source: (StackOverflow)

How to determine if a string is a valid IPv4 or IPv6 address in C#?

I know regex is dangerous for validating IP addresses because of the different forms an IP address can take.

I've seen similar questions for C and C++, and those were resolved with a function that doesn't exist in C# inet_ntop()

The .NET solutions I've found only handle the standard "ddd.ddd.ddd.ddd" form. Any suggestions?


Source: (StackOverflow)

How to validate IP address in Python? [duplicate]

This question already has an answer here:

What's the best way to validate that an IP entered by the user is valid? It comes in as a string.


Source: (StackOverflow)

Getting the client IP address: REMOTE_ADDR, HTTP_X_FORWARDED_FOR, what else could be useful?

I understand it's a standard practice to look at both these variables. Of course they can easily be spoofed. I'm curious how often can you expect these values (especially the HTTP_X_FORWARDED_FOR) to contain genuine information and not just be scrambled or have their values stripped away?

Anyone with the experience or statistics on this stuff?

Is there anything else that can be useful for the task of getting the client's IP address?


Source: (StackOverflow)

What is the most appropriate data type for storing an IP address in SQL server? [duplicate]

This question already has an answer here:

What should be the most recommended datatype for storing an IPv4 address in SQL server?

Or maybe someone has already created a user SQL data-type (.Net assembly) for it?

I don't need sorting.


Source: (StackOverflow)

Getting the 'external' IP address in Java

I'm not too sure how to go about getting the external IP address of the machine as a computer outside of a network would see it.

My following IPAddress class only gets the local IP address of the machine.

public class IPAddress {

    private InetAddress thisIp;

    private String thisIpAddress;

    private void setIpAdd() {
        try {
            InetAddress thisIp = InetAddress.getLocalHost();
            thisIpAddress = thisIp.getHostAddress().toString();
        } catch (Exception e) {
        }
    }

    protected String getIpAddress() {
        setIpAdd();
        return thisIpAddress;
    }
}

Source: (StackOverflow)