IPv6

Networking

Internet Protocol version 6. Uses 128-bit addresses (e.g., 2001:db8::1), providing a virtually unlimited address space. No NAT needed. Growing CDN adoption as mobile networks push IPv6-first connectivity.

Updated Mar 9, 2026

Full Explanation

IPv6 solves the address exhaustion problem with 128-bit addresses—enough for every grain of sand on Earth to have billions of IPs. More importantly for CDNs, IPv6 eliminates the need for NAT. Every device gets a globally routable address, which simplifies Anycast deployments, improves traceability for abuse handling, and removes the performance overhead of NAT traversal.

Many mobile networks are now IPv6-only with NAT64 gateways for legacy IPv4 content. If your CDN doesn't support IPv6, those users take a detour through a translation layer, adding latency. Major CDNs like Cloudflare and Fastly enable IPv6 by default.

IPv6 also has a larger minimum MTU (1280 bytes vs. IPv4's 576), which reduces fragmentation issues. And because IPv6 headers are simpler (no checksum), routers can process them slightly faster.

Examples

Testing IPv6 CDN connectivity:

# Force IPv6
curl -6 -sI https://cdn.example.com/

# Resolve AAAA record
dig AAAA cdn.example.com +short
# 2606:4700::6810:85e5

CloudFront IPv6 configuration (Terraform):

resource "aws_cloudfront_distribution" "cdn" {
  is_ipv6_enabled = true

  origin {
    domain_name = "origin.example.com"
    origin_id   = "myOrigin"
  }

  # ... rest of config
}

Video Explanation

Frequently Asked Questions

Internet Protocol version 6. Uses 128-bit addresses (e.g., 2001:db8::1), providing a virtually unlimited address space. No NAT needed. Growing CDN adoption as mobile networks push IPv6-first connectivity.

Testing IPv6 CDN connectivity:

# Force IPv6
curl -6 -sI https://cdn.example.com/

# Resolve AAAA record
dig AAAA cdn.example.com +short
# 2606:4700::6810:85e5

CloudFront IPv6 configuration (Terraform):

resource "aws_cloudfront_distribution" "cdn" {
  is_ipv6_enabled = true

  origin {
    domain_name = "origin.example.com"
    origin_id   = "myOrigin"
  }

  # ... rest of config
}

Related CDN concepts include:

  • IPv4 — Internet Protocol version 4. Uses 32-bit addresses (e.g., 192.0.2.1), giving roughly 4.3 billion unique addresses. …
Previous Term IPv4
Next Term Jitter
Back to Glossary