AS12635 — AS12635 Vienna

AS12635 announces 0 IPv4 prefixes covering 0 addresses and 2 IPv6 prefixes.

About this network

A national mobile operator's AS number carrying IPv6 and nothing else.

What it's used for

• Mobile network connectivity in Austria. Two IPv6 prefixes announced, and no IPv4 whatsoever — zero addresses, zero prefixes.

Notable

• The announcements are 2001:4b69::/32 and 2001:4b6c::/30.
• A /30 is four times the standard /32 allocation.
• The registry lookup for the blocks failed rather than returning nothing, so the netnames and allocation dates are unknown here.
• No addresses were sampled for reverse DNS, because there are no IPv4 addresses to sample.

Interesting

• An AS with no IPv4 at all is rare enough to be worth stopping over. An operator this size plainly uses IPv4 somewhere; none of it is announced under this number, which means the company splits its routing across more than one autonomous system and this one was given the IPv6 job.
• Mobile networks were the first place IPv6 became ordinary rather than experimental. A phone network hands out an address to every device that switches on, the device count went past what IPv4 could cover years ago, and carrier-grade translation was the alternative. Several large mobile operators now run IPv6 to the handset and translate only what still needs it.
• The /30 is the interesting half of the allocation. Four standard allocations' worth of space is what a registry gives an operator that expects to number a whole country's devices, and it costs the same as one, because that is the point of IPv6.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 2001:4b69::/32
• 2001:4b6c::/30

Upstream networks

• AS25255 Hutchison Drei Austria GmbH

Adjacent networks

• AS25255 Hutchison Drei Austria GmbH