How does IPv6 scale compare to IPv4 for network interfaces?

A single IPv6 prefix supports massive scale without conservation needs. An IPv6 /80 prefix assigned to an interface contains approximately 300 trillion individual addresses, eliminating the need for NAT strictly for address conservation purposes.

What prevents accidental internet exposure if routes are misconfigured?

VPC Block Public Access blocks traffic regardless of attached gateway configurations. This declarative control secures resources even when a route to an Internet Gateway exists, preventing leaks from the massive 300 trillion address space.

Can I use public-style addresses without advertising them globally?

Yes, organizations can assign private Global Unicast Addresses within IPAM pools. These prefixes remain withdrawn from global routing tables by default, securing the 300 trillion potential addresses while preserving options for future public exposure.

Does using unique local addresses reduce billing complexity?

Unique Local Addresses remain strictly private and unrouteable outside the VPC boundary. This approach avoids direct address costs and prevents accidental exposure of the 300 trillion addresses found in larger Global Unicast prefixes.

Why is address advertisement status critical for security planning?

Advertisement status determines if an address is reachable from the internet. AWS defines public addresses as those advertised, so controlling this status protects the 300 trillion addresses in a prefix from unintended external access.

IPv6 block access: Stop leaks before March 2026

Sun, 01 Mar 2026 00:00:00 +0000

Starting March 1, 2026, hourly billing for public IPv4 addresses forces an immediate economic pivot to IPv6-only architectures. Relying solely on routing tables or Egress-only Internet Gateways provides a false sense of security when Global Unicast Addresses are involved.

Block on Wirez

IPv6 block access: Stop leaks before March 2026