AS15665 WOLA-AS Campus Wola autonomous system

Five institutes and a university share one number, and the machines answering are desktops.

What it's used for

• An academy campus network. Six IPv4 prefixes announced from Poland, no IPv6, two thousand five hundred and sixty addresses, through a single observed BGP neighbour.

Notable

• The AS handle is a campus name followed by the words "autonomous system" spelled out in lower case, where every other record in this range uses an abbreviation.
• The six blocks carry five different netnames, one per institute, and they sit in consecutive pieces of one range. One is registered to a university rather than to the academy.
• The reverse names use three further institute domains, none of which is the holder's.
• Every answering name is pc followed by digits, so the machines are individual desktops with publicly routed addresses.
• Those digits are the third and fourth octets run together with no separator: pc38128.icho.edu.pl and pc40128.ichf.edu.pl.
• On one block the answering domain belongs to a different institute than the netname names.
• Eighteen addresses were queried and five returned a name.

Interesting

• Concatenating two octets into one number is unambiguous only while both stay three digits wide. The same scheme gives one string for two different addresses as soon as they do not.
• One neighbour for a whole campus means the computing centre that registered these blocks is also the single path in and out. The five institutes share a number because they share that connection.