NAT64, or Network Address Translation 64, is a networking technology that enables communication between IPv4 and IPv6 address spaces. It translates IPv6 addresses into IPv4 addresses and vice versa, allowing both types of networks to communicate with each other. This technology is essential because it facilitates a smooth transition from IPv4 to IPv6 and promotes coexistence during the ongoing expansion of the Internet.

Key Takeaways

  1. NAT64 is a network mechanism that facilitates communication between IPv6 and IPv4 networks by providing an IPv6 to IPv4 translation in the communication process.
  2. It is essential for ensuring smooth transition from IPv4 to IPv6 as it allows both types of networks to coexist and exchange information even though IPv6 addresses are not fully adopted globally.
  3. NAT64 can be implemented through both hardware and software solutions, but it may introduce latency in network communications due to the additional translation process involved.


NAT64 (Network Address Translation 64) is an important technology term as it plays a pivotal role in the coexistence and transition between IPv4 and IPv6 networks.

With the exhaustion of IPv4 addresses and the growing adoption of IPv6, NAT64 provides a seamless mechanism for IPv6-only clients to communicate with IPv4-only servers, by translating IPv6 addresses into IPv4 addresses and vice versa.

This translation capability enables businesses and organizations to gradually migrate to IPv6 without causing disruption to their existing infrastructure or sacrificing the user experience.

As a result, NAT64 is a critical component in maintaining network interoperability and accelerating global IPv6 adoption.


NAT64 (Network Address Translation 64) serves primarily as a critical facilitator of communication between IPv4 and IPv6 networks, considering that transitioning from the former to the latter is a necessary step to accommodate the ever-growing number of devices in the digital world. As the Internet continues to expand, IPv4’s limited address space, with just over 4 billion unique IP addresses, has become inadequate.

IPv6, by contrast, offers a vast address pool, allowing for seamless integration of networks while catering to the increasing demand for IP addresses. Nevertheless, since many existing systems still utilize IPv4, a bridge to ensure coexistence and connectivity between the two protocols becomes indispensable, and that is where NAT64 enters the scene.

NAT64 plays a vital role in this transitional phase by enabling a smooth and functional link between IPv4 and IPv6 infrastructures without disrupting ongoing services or requiring extensive re-engineering efforts. It helps by translating IPv6 addresses to IPv4 addresses and vice versa, allowing devices operating on either network to communicate with each other without compatibility issues.

Organizations and service providers can rely on NAT64 to preserve existing IPv4 services while progressively adopting IPv6, ensuring that end-users are not negatively affected by the change. In essence, NAT64 acts as a backbone for the future of the Internet by facilitating the necessary transition from the exhausted IPv4 address pool to the virtually unlimited possibilities offered by IPv6.

Examples of NAT64

NAT64 (Network Address Translation 64) is a technology that enables communication between IPv6-only and IPv4-only devices by translating IPv6 addresses to IPv4 addresses and vice versa. Here are three real-world examples of NAT64:

Cellular Networks: NAT64 can be used by mobile network operators to facilitate the transition of their infrastructure and devices to IPv

In this scenario, IPv6-only devices can still access IPv4-only content and resources on the internet, allowing users to experience seamless connectivity even when some sites or services have not yet migrated to IPv

Data Centers: Internet service providers and large-scale organizations with data centers often implement NAT64 to conserve IPv4 addresses and minimize the impact of IPv4 address exhaustion. By employing NAT64 at the edge of the data center, the organization can internally use an IPv6 infrastructure while still providing access to IPv4-only devices outside.

Content Delivery Networks (CDNs): CDNs use NAT64 to deliver content efficiently to both IPv4 and IPv6 enabled devices. In this example, clients with IPv6-only connections can still access IPv4 content caches across the CDN. The NAT64 gateway translates the IPv6 requests to IPv4 requests and obtains the content from the appropriate cache. This helps maintain compatibility with legacy IPv4 content while ensuring optimal content delivery performance.These examples demonstrate the versatility of NAT64 in various real-world scenarios, ensuring smooth communication between the increasingly prevalent IPv6 networks and legacy IPv4 systems.

Frequently Asked Questions about NAT64

Q1: What is NAT64?

A1: NAT64 (Network Address Translation 64) is a mechanism that enables communication between IPv6 and IPv4 networks by translating IPv6 addresses into IPv4 addresses and vice versa. It specifically helps to mitigate the IPv4 address exhaustion and support the transition from IPv4 to IPv6 networks.

Q2: How does NAT64 work?

A2: NAT64 uses a translator that sits between IPv6 and IPv4 networks. The translator takes an incoming IPv6 address, removes the embedded IPv4 address, and translates it into a new IPv4 address. This new address is then used to communicate with the IPv4 network. The process is similar when converting an IPv4 address to an IPv6 address.

Q3: In which cases is NAT64 used?

A3: NAT64 is typically used in cases where an organization adopts IPv6 and needs to maintain connectivity with IPv4-only networks and services. This includes scenarios like transition from IPv4 to IPv6 and providing access to legacy IPv4 content for IPv6 users and devices.

Q4: What are the benefits of using NAT64?

A4: The benefits of using NAT64 include:
1. Supporting a smooth transition from IPv4 to IPv6 networks.
2. Enabling IPv6-only devices and networks to communicate with the IPv4 Internet.
3. Reducing the demand for IPv4 addresses by reusing existing IPv4 addresses.
4. Providing a scalable approach to work with both IPv4 and IPv6 networks simultaneously.

Q5: Are there any limitations or drawbacks to NAT64?

A5: Some limitations or drawbacks of NAT64 include:
1. Certain applications may not work correctly due to the translation process.
2. NAT64 relies on a central translator, which may become a bottleneck or single point of failure.
3. Increased latency due to the address translation process.
4. Some IPv4 addresses might not be correctly translated, causing connectivity issues.

Related Technology Terms

  • IPv6 Transition Mechanism
  • Address Translation
  • Stateful NAT64
  • Stateless NAT64
  • DNS64

Sources for More Information

  • RFC Editor – The homepage of the RFC Editor, where you can find the latest and most authoritative information about internet standards, including NAT64.
  • Internet Assigned Numbers Authority (IANA) – IANA is responsible for the global coordination of the Internet Protocol address space and other number resources, providing documentation and information regarding NAT64 and other Internet protocols.
  • IETF Tools – The Internet Engineering Task Force (IETF) has a variety of working groups, documents, and other resources related to networking technologies, including NAT64.
  • Cisco – As a leading provider of networking solutions, Cisco offers detailed technical documentation and guides on implementing and troubleshooting NAT64 and other networking technologies.

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