What Is My IP Address?

What Is an IP Address?

An IP address (Internet Protocol address) is a numerical label assigned to every device that connects to a computer network using the Internet Protocol. Think of it as a postal address for your internet connection — just as your home needs a street address to receive mail, your device needs an IP address to send and receive data across the internet.

IP addresses serve two core functions: host identification (identifying the device or interface) and location addressing (providing the information needed to route packets of data to the correct destination). Without IP addresses, the internet as we know it simply could not exist — every email sent, every web page loaded, and every video streamed relies on this fundamental system of addressing.

The Internet Assigned Numbers Authority (IANA) is responsible for global IP address allocation. IANA distributes blocks of addresses to five Regional Internet Registries (RIRs), which in turn distribute them to Internet Service Providers and large organizations, who finally assign individual addresses to end users like you.

Public vs. Private IP Addresses

One of the most important distinctions in networking is the difference between public and private IP addresses.

Public IP Addresses

Your public IP address is the address assigned to your internet connection by your Internet Service Provider (ISP). It is the address visible to websites, servers, and services on the public internet. When you visit a website, that website's server sees your public IP address as the source of the request. This tool displays your public IP — it is what the rest of the internet sees when you make any connection.

Private IP Addresses

Your private IP address is the address assigned to your specific device within your local network (your home or office network). Your router assigns private addresses to all devices connected to it. Private IP ranges are defined by RFC 1918 and include:

• 10.0.0.0 – 10.255.255.255 (Class A private range)
• 172.16.0.0 – 172.31.255.255 (Class B private range)
• 192.168.0.0 – 192.168.255.255 (Class C private range — most common in homes)

Private IP addresses are not routed on the public internet. They are reused in millions of networks worldwide, which is why your phone at home and a phone in Japan might both have the private address 192.168.1.5 — they exist in completely separate private networks and are invisible to each other.

IPv4 vs. IPv6

There are currently two versions of the Internet Protocol in active use: IPv4 and IPv6. Understanding the difference is crucial to understanding modern networking.

Why IPv6 Was Created

In the early days of the internet, IPv4's 4.3 billion addresses seemed more than sufficient. But the explosive growth of smartphones, IoT devices, cloud servers, and connected appliances meant the world ran out of new IPv4 addresses around 2011. IANA distributed the last blocks of IPv4 addresses to the RIRs, which have since been managing a dwindling supply through recycling and allocation policies.

IPv6 solves the address exhaustion problem permanently. With 128-bit addresses, IPv6 can provide approximately 3.4 × 10³⁸ unique addresses — enough to assign billions of addresses to every grain of sand on Earth. IPv6 also improves routing efficiency, eliminates the need for NAT in most cases, includes built-in security features through IPsec, and provides better support for mobile networks.

Why You May Not Have an IPv6 Address

Despite being standardized for over two decades, IPv6 adoption remains incomplete. Not all ISPs have deployed IPv6 infrastructure, particularly in some regions and countries. If this tool shows "Not Available" for your IPv6 address, it typically means your ISP has not yet enabled IPv6 on your connection, or your router or network configuration does not support it.

How Internet Routing Works & What NAT Does

When you type a website address into your browser, your computer sends a data packet containing your public IP address (as the source) and the website server's IP address (as the destination). Routers across the internet examine the destination address and forward the packet toward its target, hop by hop, using the most efficient path available.

This process is governed by routing protocols such as BGP (Border Gateway Protocol), which is the backbone routing protocol of the internet. BGP allows autonomous systems (large networks operated by ISPs and organizations) to exchange routing information and determine the best paths between networks.

Network Address Translation (NAT)

NAT is the technology that allows multiple devices in your home to share a single public IP address. Your home router acts as a NAT gateway: when you make a request to a website, your router replaces your device's private IP address with the router's public IP address before forwarding the packet. When the response arrives, the router uses a translation table to forward the data back to the correct device on your private network.

NAT has been instrumental in extending the useful life of IPv4 by allowing entire households and businesses to share single public addresses. However, NAT adds complexity, can break some peer-to-peer applications, and is considered a workaround rather than a long-term solution — which is another reason IPv6 adoption is so important.

ISPs, Dynamic vs. Static IP Addresses

Your Internet Service Provider (ISP) is responsible for assigning your public IP address. Most residential ISPs use dynamic IP addresses, which means the specific address assigned to you can change periodically — when you restart your router, when your DHCP lease expires, or at intervals determined by the ISP.

Static IP addresses, on the other hand, remain constant. They are typically offered by ISPs as a paid add-on service and are primarily used by businesses that need to host servers, run remote access services, or require consistent addressing for operational reasons. A static IP allows inbound connections to always reach the same address, which is essential for running a web server, mail server, or VPN gateway from your premises.

Does Restarting Your Router Change Your IP?

Sometimes yes, sometimes no. When you restart your router, it releases its DHCP lease and requests a new IP from your ISP. If your ISP's DHCP server assigns you a different address from its pool, your IP will change. However, many ISPs maintain "sticky" dynamic IPs that tend to reassign the same address to the same router MAC address, making your IP appear static even though it technically is not.

How Websites See Your IP Address

Every time you connect to a website, your browser sends an HTTP or HTTPS request that inherently includes your IP address as part of the network packet. The web server needs your IP address to know where to send the response — without it, communication would be impossible.

Beyond basic connection handling, websites may log your IP address for various purposes including security monitoring, fraud detection, analytics, compliance with legal obligations, rate limiting, and targeted content delivery. Web application firewalls and CDN (Content Delivery Network) providers also use IP addresses to detect and block malicious traffic patterns.

Additionally, websites can obtain indirect information from your IP: the approximate geographic region, your ISP's name, and whether the address belongs to a known VPN, proxy, or hosting provider. They cannot, however, determine your exact physical address, your identity, or any other personally identifiable information from an IP address alone.

IP Geolocation: Capabilities and Limitations

IP geolocation is the process of estimating the physical location associated with an IP address. Geolocation databases are built by mapping IP address ranges to geographic locations using a combination of publicly available WHOIS registration data, routing table analysis, active probing techniques, and user-submitted correction data.

The accuracy of IP geolocation varies considerably depending on the level of detail required:

• Country level: Generally 95–99% accurate for IPv4 addresses
• Region/State level: Accuracy drops to approximately 55–80%
• City level: Accuracy typically ranges from 50–75%
• Street address: Not reliably possible via IP geolocation alone

Several factors can cause IP geolocation to be inaccurate or misleading: ISPs that register IP ranges at corporate headquarters far from where they are actually deployed; mobile networks that route all traffic through central gateways; CDN providers and cloud services; and VPN or proxy usage, which makes it appear that you are connecting from an entirely different location.

VPNs, Proxies & Their Effect on Your IP

Virtual Private Networks (VPNs)

A VPN creates an encrypted tunnel between your device and a VPN server operated by a VPN provider. All your internet traffic is routed through this tunnel, so websites and services see the VPN server's IP address rather than your real public IP. A VPN provides three main benefits: it hides your real IP from websites, it encrypts your traffic from your ISP (so your ISP cannot see what sites you visit), and it allows you to appear to be in a different geographic location.

VPNs are not a perfect privacy solution. The VPN provider itself sees your real IP address and, potentially, your traffic. This is why choosing a reputable VPN provider with a verified no-logs policy is critical. Additionally, DNS leaks, WebRTC leaks, and IPv6 leaks can sometimes expose your real IP even when a VPN is active.

Proxy Servers

A proxy server acts as an intermediary between your device and the internet. Like a VPN, a proxy forwards your traffic through its own IP address. However, unlike a VPN, most proxies do not encrypt your traffic. HTTP and HTTPS proxies operate at the application layer and typically only proxy traffic from your browser, not your entire operating system's network traffic. SOCKS proxies are lower-level and can handle more types of traffic.

Free public proxy services should be used with extreme caution as they are commonly operated by malicious actors seeking to intercept unencrypted data.

When Changing Your IP Does and Does Not Improve Privacy

Changing your public IP address (via VPN, proxy, or requesting a new address from your ISP) does help reduce IP-based tracking. However, websites use many other tracking methods beyond IP addresses — browser fingerprinting, cookies, login sessions, and behavioral analysis. Changing your IP alone does not make you anonymous online and does not prevent tracking by platforms where you are logged in.

The Domain Name System (DNS)

The Domain Name System (DNS) is often described as the "phone book of the internet." Humans remember domain names like example.com, but computers communicate using IP addresses. DNS is the system that translates domain names into the IP addresses needed to establish connections.

When you type a URL into your browser, your computer queries a DNS resolver (typically provided by your ISP, though you can use alternatives like Google's 8.8.8.8 or Cloudflare's 1.1.1.1). The resolver returns the IP address associated with the domain, and your browser then connects to that IP address.

DNS is a potential privacy concern because your DNS resolver sees every domain name you look up, even if the connection to the final website is encrypted. Using a privacy-respecting DNS resolver that supports DNS over HTTPS (DoH) or DNS over TLS (DoT) can help protect your browsing privacy from your ISP and local network observers.

Network Security, Firewalls & IP-Based Threats

IP addresses play a central role in network security. Firewalls use IP address filtering as a fundamental security layer — blocking connections from known malicious IP ranges, restricting which IP addresses are allowed to access sensitive services, and logging suspicious connection attempts for analysis.

Common IP-based security measures include:

• Allowlisting (whitelisting): Only permitting connections from specified trusted IP addresses
• Blocklisting (blacklisting): Refusing connections from known malicious or abusive IP addresses
• Rate limiting: Restricting the number of requests allowed from a single IP in a given time window to prevent abuse
• Geo-blocking: Restricting access to content or services based on the geographic location inferred from an IP address
• Intrusion Detection Systems (IDS): Monitoring traffic patterns to identify suspicious activity associated with specific IP addresses

While your IP address being known to a potential attacker is not inherently dangerous (your router's NAT and firewall block most unsolicited incoming traffic), maintaining updated router firmware, disabling unnecessary remote management interfaces, and using a strong Wi-Fi password significantly reduces your exposure to IP-related security risks.

Online Privacy & Your IP Address

In many jurisdictions, IP addresses are considered personal data because they can potentially be used to identify an individual when combined with ISP records. For example, copyright enforcement agencies frequently collect the IP addresses of users they believe are infringing copyright, then subpoena ISPs to obtain the identity of the account holder associated with those addresses.

Under regulations such as the EU's GDPR and California's CCPA, IP addresses may be treated as personal data requiring appropriate handling and disclosure in privacy policies. Website operators who log user IP addresses are typically required to disclose this practice in their privacy policies and, under some regulations, obtain appropriate consent.

Best practices for protecting your online privacy related to your IP address include using a reputable VPN service, enabling DNS over HTTPS in your browser, using privacy-focused browsers and extensions, being cautious about logging into accounts over public Wi-Fi networks, and regularly reviewing the privacy settings of services you use.

Common IP Address Misconceptions

There are many persistent myths about IP addresses that are worth correcting:

• Myth: "Someone can find my exact home address using my IP." — Reality: IP geolocation typically shows a general area at best, not your street address. Only your ISP can associate an IP address with a specific customer account, and they only share this under legal compulsion.
• Myth: "My IP address uniquely identifies me as a person." — Reality: An IP address identifies a connection or device, not a person. Multiple people in your household share the same public IP. At a coffee shop, hundreds of people might share one IP address.
• Myth: "A VPN makes me completely anonymous online." — Reality: A VPN hides your IP from websites but does not prevent tracking via cookies, browser fingerprinting, or account logins. It also does not hide your activity from the VPN provider.
• Myth: "Changing my IP improves my security against hacking." — Reality: Most cyber attacks do not rely on knowing your IP in advance. Strong passwords, software updates, and good security practices matter far more than IP changes.
• Myth: "IPv6 addresses are less private because they contain your MAC address." — Reality: While early IPv6 implementations used MAC addresses in "EUI-64" format, modern systems use privacy extensions (RFC 4941) that generate random, temporary IPv6 addresses to prevent device tracking.