IPv4 vs IPv6 — What Is the Difference?

IPv4 vs IPv6 — What Is the Difference?

IPv4 and IPv6 are two versions of the Internet Protocol — the system that assigns addresses to every device connected to the internet. IPv4 has been the backbone of the internet for decades, but IPv6 was developed to address IPv4's fundamental limitation: address exhaustion.

IPv4 — The Current Standard

IPv4 addresses look like: 192.168.1.1 — four numbers (0–255) separated by dots. IPv4 provides approximately 4.3 billion unique addresses. With billions of internet-connected devices worldwide, IPv4 addresses have been largely exhausted at the regional level since around 2011. NAT (Network Address Translation) has been the main workaround, allowing thousands of private devices to share one public IPv4 address.

IPv6 — The Long-Term Solution

IPv6 addresses look like: 2001:0db8:85a3:0000:0000:8a2e:0370:7334 — eight groups of four hexadecimal digits separated by colons. IPv6 provides 340 undecillion (3.4 × 10^38) unique addresses — effectively unlimited for all practical purposes. With IPv6, every device can have its own unique public address, eliminating the need for NAT.

IPv6 Features

• Larger address space: Enough addresses for every device on earth to have billions of public IPs
• Auto-configuration (SLAAC): Devices can configure their own IPv6 addresses without DHCP
• Built-in IPsec support: Security features are part of the protocol design
• Simplified routing: More efficient packet headers reduce router processing overhead

IPv6 Adoption

As of 2025, approximately 40–45% of global internet traffic uses IPv6. Major content providers (Google, Facebook, Netflix) and many ISPs fully support IPv6. Most home routers support IPv6 — look for IPv6 settings in your router admin panel under WAN or Internet settings.

Do You Need IPv6?

For most users, IPv6 works transparently alongside IPv4 (called dual-stack). If your ISP supports IPv6, enabling it on your router means your devices can communicate directly with IPv6 servers without NAT, which can improve performance for services that prioritise IPv6.