IPv4 vs IPv6

Compare IPv4 and IPv6 address formats, availability, routing behavior, and what each version means for everyday internet users.

IPv4 and IPv6 are two versions of internet addressing. IPv4 is older and still widely used, while IPv6 was created to provide a much larger pool of addresses for modern internet growth.

Most users do not need to choose one manually, but knowing the difference can help when troubleshooting routers, VPNs, games, firewalls, websites, and ISP connectivity.

IPv4 format and limits

IPv4 uses four decimal numbers separated by dots, such as 8.8.8.8. The total address space is limited, which is why NAT and address sharing are common.

IPv6 format and benefits

IPv6 uses hexadecimal groups separated by colons and supports a vastly larger address space. It can improve address availability and reduce the need for some forms of NAT.

Why both versions still exist

The internet is transitioning gradually. Many networks run dual stack so devices can reach websites that support either IPv4 or IPv6.

Troubleshooting version differences

A website, VPN, firewall, or DNS setup may behave differently over IPv4 and IPv6. Testing both versions can reveal routing or configuration problems.

Frequently Asked Questions

Is IPv6 faster than IPv4?

Not always. Speed depends on your ISP, route, DNS, device, and the website. IPv6 can be faster on some networks and slower on others.

Can I disable IPv6?

You can on many devices, but it is usually better to fix configuration issues unless your ISP or VPN requires a temporary workaround.

Will IPv4 disappear soon?

IPv4 remains widely used, but IPv6 adoption continues to grow because the internet needs more addresses.