App: What’s My IP Address

If you ever need to know your IP address as viewed from an online source, here you go! I’ve updated the logic on this app to attempt to find the user’s true IP address. The challenges are found in the article below.

IP is a standard defining how devices on a network communicate with each other using numerical addresses.

• IPv4 is the original version of the Internet Protocol, first developed in the 1970s. It uses 32-bit addresses, which allows for a total of approximately 4.3 billion unique addresses. IPv4 is still widely used today, but it is running out of available addresses due to the rapid growth of the internet. An IPv4 address is a 32-bit numerical address that consists of four octets (8-bit blocks) separated by periods. The following is a valid IPv4 address (e.g. 192.168.1.1). They can be written in hexadecimal notation as well. (e.g. 0xC0A80101)
• IPv6 is a newer Internet Protocol version developed to address the shortage of available IPv4 addresses. It uses 128-bit addresses, allowing a virtually unlimited number of unique addresses. IPv6 is gradually being adopted as more devices are connected to the internet and the demand for unique addresses increases. An IPv6 address is a 128-bit numerical address comprising eight 16-bit blocks separated by colons. For example, the following is a valid IPv6 address (e.g. 2001:0db8:85a3:0000:0000:8a2e:0370:7334 or using shorthand notation 2001:db8:85a3::8a2e:370:7334).

Both IPv4 and IPv6 are used to route data packets over the Internet, but they are not compatible. Some devices may support both versions of the protocol, while others may only support one or the other.

Why Is An IP Address Difficult to Detect?

Finding a user’s actual IP address can be challenging due to several factors, necessitating additional code for accurate detection. This complexity arises from the internet’s architecture, privacy considerations, and the use of various technologies designed to anonymize or protect user identities.

Here are some key reasons why accurately identifying a user’s actual IP address can be challenging:

1. Use of Proxies and VPNs

• Anonymity Services: Many users utilize VPNs (Virtual Private Networks) or proxy servers to mask their real IP addresses for privacy reasons or to bypass geographical restrictions. These services route the user’s internet traffic through an intermediary server, hiding the originating IP address from the destination server.
• Content Delivery Networks (CDNs): Websites often use CDNs to distribute content more efficiently and reduce latency. A CDN can obscure the user’s IP address, showing instead the IP address of the CDN node closest to the user.

2. NAT (Network Address Translation)

• Shared IP Addresses: NAT allows multiple devices on a private network to share a single public IP address. This means the IP address seen by external servers might represent multiple users or devices, complicating identifying individual users.

3. Dynamic IP Addresses

• IP Address Reassignment: ISPs (Internet Service Providers) often assign users dynamic IP addresses, which can change periodically. This variability means an IP address associated with a user at one time might be reassigned to a different user later, complicating tracking efforts.

4. IPv6 Adoption

• Multiple IP Addresses: With the adoption of IPv6, users can have multiple IP addresses, including local and global scopes, further complicating identification. IPv6 also introduces privacy features like address randomization that periodically change a user’s IP address.

5. Privacy Regulations and User Preferences

• Legislation and Browser Settings: Laws like GDPR (General Data Protection Regulation) in the EU and user-configured privacy settings in browsers can limit the ability of websites to track and identify users through their IP addresses.

6. Technical Limitations and Configuration Errors

• Misconfigured Networks: Incorrectly configured networks or servers can send incorrect header information, leading to inaccurate IP detection. Trusting only specific headers and validating their IP addresses is necessary to avoid spoofing.

Given these complexities, accurately identifying a user’s IP address requires sophisticated logic to navigate the myriad ways users connect to the internet while respecting privacy and security standards. I’ve tried to accommodate the additional logic in our tool above.

When Do You Need To Know Your IP Address?

Knowing your IP address is essential when managing tasks such as configuring whitelisting for security protocols or filtering traffic in Google Analytics. Understanding the difference between internal and external IP addresses in this context is crucial.

The IP address visible to a web server is not the internal IP address assigned to your device within a local network. Instead, the external IP address represents the broader network you are connected to, such as your home or office network.

This external IP address is what websites and external services see—consequently, your external IP address changes when you switch between wireless networks. However, your internal IP address, used for communication within your local network, remains distinct and unaltered by these network changes.

Many Internet service providers assign businesses or homes a static (unchanging) IP address. Some services expire and reassign IP addresses regularly. If your IP address is static, it’s a best practice to filter out your traffic from GA4 (and anyone else working on your site and skewing your reporting).