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What is IPv6? (Internet Protocol version 6)

IPv6 is the successor to the current standard used for the internet IPv4.

IP is an address on a network/internet. IPv4 has 3,706,452,992 public addresses. This may sound like a lot but when you add up all the computers, servers and devices plus large quantities that were sold to companies like apple and HP in the early days of the internet.

At this current point in time most of the IP addresses available have been used up and getting more is very costly and requires a lot of work to do.

IPv6 has 3.4×10^38 possible addresses to use. It is estimated there is not enough room on earth for the amount of devices to use all the addresses available.

IPv6 also has some new and advanced features that will improve the performance of the internet in many ways.

Why IPv6? (Internet Protocol version 6)

  • IPv4 addresses are running out and to purchase more is very expensive.
  • The internet is starting to make big moves to support IPv6. Currently, it is estimated 25% of devices also support IPv6. The majority of these will be servers providing websites and service.

Residential IPv6 at Aussie Broadband

IPv6 is now a part of the production residential Internet service provided by ABB over the nbn™.

We have been enabling it automatically on all new residential nbn™ customers’ services as of the 1st of November, 2021.

We are also in the process of adding IPv6 to existing residential nbn™ customers’ services where we can see that their router (“modem”) is asking us for the IPv6 protocol. This includes Google Nest Wifi devices which have IPv6 enabled automatically by Google when they are first attached to our network.

IPv6 is not currently supported for customers attached to the Opticomm network, due to a technical limitation.

We do not currently have an IPv6 business product. That will be worked on after the IPv6 residential project is complete.

We’re providing a delegated IPv6 /48 prefix for use on the LAN interfaces of the residential router. This provides 65 536 /64 IPv6 subnets for use on individual LAN interfaces, such as multiple Wifi networks. This is a lot of /64s, however it is simpler and cheaper for us to give all customers a /48.

The /48 will eventually be stable within a state of Australia, meaning that if you move house within a state, your /48 will stay the same. This state level stability of the /48 is unfortunately not currently available due to the on-going Aussie Broadband fibre optic network build, which will be providing us with our own direct links to many of the nbn™ POIs (Points of Interconnect). State stable /48s are expected to be available within the next three to six months.

Note that it is safe to have public IPv6 addresses on the devices in your home. Most IPv6 capable residential routers will have an IPv6 firewall protecting end-user devices, with the firewall enabled by default. Additionally, many end-user devices, such as Windows PCs, also have IPv6 firewalls on them that is enabled by default. Furthermore, many devices pick IPv6 addresses randomly from within the link’s /64 subnet, making the address unpredictable and hard to discover via unsolicited packet probing. Finally, end-user devices can also use IPv6 temporary addresses for outbound connections, meaning that the IPv6 address is only used for a period of no more than a week.

If you are an existing customer attached to Aussie Broadband via the nbn™, and can enable IPv6 on your router (“modem”), contact our Customer Support team to have IPv6 added to your residential service.

Technical Details For Those Interested

We use DHCPv6 for both the the WAN interface Globally Unique Address (GUA) IPv6 address, via the IA_NA option, and the delegated IPv6 Global Unicast /48 prefix via the IA_PD option for use on the LANs downstream of the residential router.

We also provide our IPv6 anycast DNS resolver addresses via DHCPv6, using the DHCPv6 DNS SERVERS option.

Acquiring the WAN IPv6 addressing, LAN delegated prefix and the DNS server addresses via DHCPv6 are the likely default for residential routers when they are IPv6 capable and enabled.

The anycast DNS IPv6 resolver addresses are 2403:5800:100:1::142 ( and 2403:5800:1:5::242 ( It is preferable to acquire them from DHCPv6 however, just in case we need to change them in the future.

Reverse DNS Delegation

Advanced residential users can set up reverse DNS delegation for their /48 prefix. This is currently still done via the IPv6 Native Beta website. For the moment, these reverse delegations will need to be updated if the /48 prefix we supply you with changes, which may occasionally occur as we manage our nbn™ CVCs. We provide notification of when these CVC changes will occur within the MyAussie portal and Smartphone application, and you can have them sent to you via SMS and/or email if you enable those options under your Profile within “Outage Communication Preferences”.

IPv6 Router Configuration

To learn more about configuring your router for IPv6, click here.

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