What Is IPv4 Proxy? How It Works and Why IPv4 Still Matters

The internet as we know it relies on IP (Internet Protocol) addresses. These addresses allow devices to communicate and exchange data online. Today, IPv4 and IPv6 are the two main versions in use. Despite the gradual rollout of IPv6, IPv4 remains more widely supported across websites, applications, and networks.

IPv4 proxies use IPv4 addresses to route traffic between your device and target websites, powering a wide range of online tasks, including web scraping, market research, ad verification, social media management, and more. In this article, we explore what IPv4 proxies are, how they work, why they remain in high demand despite address limits, how they compare to IPv6, and how to choose a reliable provider.

What Is an IPv4 Proxy?

An IPv4 proxy is a proxy server that acts as an intermediary between your device and the internet, using an IPv4 address when forwarding requests to the target. The target sees the proxy's IPv4 address as the connection source, while your original public IP is not directly exposed. Depending on where the IP comes from, an IPv4 proxy can be residential, ISP, or datacenter.

IPv4 stands for Internet Protocol version 4, a core addressing system that has been in use for decades. Every IPv4 address is 32 bits long and is usually written as four numbers separated by dots, like 203.0.113.25. Each number ranges from 0 to 255.

How Does an IPv4 Proxy Work?

When you send a request to a target website through an IPv4 proxy, the proxy masks your original IP address with its own IPv4 address. Your device sends the request to the proxy server, which then forwards it to the target website. The website returns the requested data to the proxy, and the proxy relays it back to your device. As a result, the target website sees the proxy's IPv4 address as the source of the connection.

IPv4 communication works within the TCP/IP model. Each IP packet contains a source and destination address, allowing routers to forward the data across networks until it reaches its destination. With a proxy in the middle, the request follows an additional step before reaching the target.

Here is how the process works in four simple steps:

1. Your device, browser, or script sends a request to the proxy server first.

2. The proxy receives that request and opens its own connection to the target using its IPv4 address.

3. The target server processes the request and sends the response back to the proxy.

4. The proxy passes that response along to your device.

Why IPv4 Addresses Are Limited but Still in Demand

IPv4 uses a 32-bit address space, which allows about 4.3 billion unique addresses. That number seemed enormous when IPv4 was introduced, but the rapid growth of internet users, connected devices, cloud infrastructure, and always-on services eventually consumed most of the usable public address space.

IANA exhausted its central IPv4 free pool in 2011, and the RIRs have since worked through most of their remaining general-purpose pools. IPv4 addresses have not disappeared, however. Existing allocations continue to be used and transferred.

How Much IPv4 Address Space Is Left in 2026?

According to ARIN's 2026 IPv4 analysis, about 3.687 billion public IPv4 addresses had been allocated by the end of 2025. Across the five RIRs, only about 3.9 million addresses remained in the available category, mainly within APNIC and AFRINIC. APNIC held about 3.1 million available addresses, while AFRINIC held about 773,000.

The remaining pools have continued to shrink in 2026. As of August 13, APNIC reported holding 11,729 /24 IPv4 prefixes, equivalent to about 3.0 million addresses.

What Are IPv4 Proxies Used For?

Even with limited new supply, IPv4 remains broadly supported across networks and online services. Developers, marketers, and individual users rely on IPv4 proxies for online privacy, access to content from different locations, and separate IP addresses for different workflows. Common business and automation uses include:

• Web scraping and data collection. IPv4 proxies help scraping tools collect public data through different IP addresses, reducing blocks and rate limits during larger data collection tasks.

• Market and competitor research. Businesses can monitor prices, inventory, product availability, and competitor activity across different regions without relying on a single IP location.

• SEO and search monitoring. IPv4 proxies allow SEO teams to check search results and rankings from different countries or cities and track regional search performance.

• Ad verification. Marketers can view ads from different locations, verify campaign placement, and check whether localized content appears correctly.

• Social media management. Teams managing multiple accounts can assign different proxy connections to separate profiles, helping maintain account separation and consistent regional access.

What Is the Difference Between IPv4 and IPv6 Proxies?

To solve the address exhaustion discussed above, IPv6 was introduced, upgrading the internet's addressing system to a 128-bit format. While IPv4 proxies remain the industry standard, IPv6 proxies are slowly becoming more common. Since you already know how an IPv4 proxy operates, the two formats mainly differ in their address structure and several underlying protocol features:

• Address Format & DNS: IPv4 uses dotted-decimal numbers (e.g., 203.0.113.25) mapped via A records. IPv6 uses longer hexadecimal addresses separated by colons (e.g., 2001:db8::25) mapped via AAAA records.

• Packet Fragmentation: IPv4 packets can be fragmented by both the sending host and intermediate routers. In IPv6, routers do not fragment packets in transit; fragmentation is handled by the sending host. IPv6 also requires a minimum link MTU of 1,280 bytes and removes the header checksum.

• Address Resolution: IPv4 uses the Address Resolution Protocol (ARP) to map IP addresses to MAC addresses. In IPv6, ARP is replaced by the Neighbor Discovery Protocol (NDP).

• Security & Encryption: IPv4 supports IPsec as an optional security mechanism. For IPv6, current node requirements recommend support for the IPsec architecture.

IPv4 Proxy vs. IPv6 Proxy Quick Comparison

Even so, IPv6 proxies offer massive pools of addresses, yet many platforms are still not fully compatible. Therefore, developers and marketers prefer IPv4 proxies because they simply work. If you are deciding between the two, IPv4 remains the safer choice, especially for critical workflows like web scraping and bypassing geo-blocks.

How to Choose an IPv4 Proxy Provider?

Now that you know the basics, the next step is knowing what to look for when selecting a provider. The best IPv4 proxies are the ones that keep you connected through stable sessions and seamless performance. However, that is never going to be the case with untrusted free proxies that inject malware, hijack sessions, or leak your IP address to third parties.

Quality IPv4 proxies give you access to a secure proxy server and far more control over your online operations. When evaluating a provider, look for the following key features:

• Pool size and locations: A larger global pool of IPv4 addresses means fewer repeats and a lower chance of landing on an already-flagged address.

• Speed and uptime: Stable response times and a clear uptime guarantee matter, since dropped connections cost more than the proxies themselves on large jobs.

• Protocol support: HTTP(S) and SOCKS5 support keeps the proxies compatible with common browsers, scrapers, and automation tools.

• Security & Legality: A reputable provider ensures data privacy (no malicious logging) and complies with standard regulations, minimizing legal risks for your business operations.

Why Choose IPcook IPv4 Proxies

If you want a provider that ticks all the boxes above, start with IPcook. As your trusted partner, we offer full control, strong uptime, and global coverage:

• Easy integration: Our IPv4 proxies easily integrate with third-party software using developer-friendly documentation and step-by-step tutorials.

• 99.9% uptime: Enjoy industry-standard reliability with stable connections that keep your automated tasks and scraping jobs running without unexpected drops.

• Massive proxy pool: IPcook continuously expands our IPv4 proxy pool to ensure better results, allowing you to easily access geo-restricted content worldwide with no extra costs.

• Hassle-free proxy rotation: For block-free web scraping, gain access to a continuously rotating residential IPv4 pool to guarantee higher success rates.

• Competitive pricing: Benefit from flexible plans tailored to different needs, with residential proxies starting as low as $0.3/GB, ISP proxies from $0.05/IP, and datacenter proxies from $0.04/IP.

Conclusion

IPv4 is the foundational, highly compatible internet protocol version that powers stable, universal network communication. While the web shifts toward newer protocols, IPv4 remains the undisputed workhorse for scraping, multi-account management, and seamless compatibility. Still, scarce or not, IPv4 isn't going anywhere anytime soon.

If you need infrastructure built for speed, scale, and uptime, IPcook is your go-to solution. With a massive global IPv4 pool, instant integration, and rock-solid reliability, we remove the friction from your workflows. Ready to level up without blocks? Explore our IPcook Residential Proxies today.