AS15623 CYBERLINK Cyberlink AG

The netname dates switch from two-digit years to four-digit ones part way through the list.

What it's used for

• A provider's network. Thirty-four IPv4 prefixes and six IPv6 prefixes announced from Switzerland, one hundred thousand addresses, across two hundred and forty-two observed BGP neighbours.

Notable

• Four netnames end in a six-digit date whose year is two digits; four more end in an eight-digit date with a full year. The change happened between them and both formats were kept.
• One netname describes a service rather than an owner, naming a wholesale broadband product and the protocol that hands out its addresses.
• One answering address is a gateway whose name marks it as a test of a configuration generator, left in public DNS.
• Another answering address is a name server under an entirely different domain.
• Three of the IPv6 prefixes are /29 blocks, each sized for a whole member organisation.
• Eighteen addresses were queried for reverse DNS and six returned a name.

Interesting

• A date format changing inside one company's records is a clock you can read. Everything before the changeover was filed under the old convention, and nobody went back to correct it.
• Naming a machine after the tool that configured it is a good habit reversed: the name says how the device was built rather than what it does, and it outlives the test that created it.
• Two hundred and forty-two neighbours puts this among the better-connected networks of its size, and the netnames say much of that space is sold on rather than used.