AS15659 NEXTGENTEL NEXTGENTEL Autonomous System

The last octet is its own DNS label, separated from the rest of the address by a dot.

What it's used for

• A national broadband provider. Fourteen IPv4 prefixes and two IPv6 prefixes announced from Norway, two hundred and thirty-eight thousand addresses, across eleven observed BGP neighbours.

Notable

• Twelve answering names put the final octet first as a label of its own, then the first three octets hyphenated together, then the company domain, so the address is split across two labels.
• One answering name breaks that pattern entirely, hyphenating all four octets and inserting a two-letter label before the domain.
• Two of the announcements are /16 blocks, each sixty-five thousand addresses, alongside pieces running all the way down to a /24.
• One block is registered to a different company under a netname combining that company's initials, the registry role and this operator's initials.
• One block's registry lookup failed. Eighteen addresses were queried for reverse DNS and thirteen returned a name.

Interesting

• Splitting an address across DNS labels changes what wildcards and zone delegations can do with it. It is a chosen structure, not a formatting quirk, and it makes per-block delegation easy.
• Two hundred and thirty-eight thousand addresses on eleven neighbours is a subscriber network: the traffic arrives from a few large upstreams and fans out to a very large number of homes.
• The one differently named address is the interesting one. A single exception in a sample of thirteen usually marks equipment that predates the current naming.