AS15373 — CZESTMAN-AS Academic AS dedicated to Metropolitan Area Network CzestMAN

AS15373 announces 3 IPv4 prefixes covering 4,608 addresses and 1 IPv6 prefixes.

About this network

Two netnames publicly label the roaming network, and the university's initials changed by one letter.

What it's used for

• An academic metropolitan area network. Three IPv4 prefixes and one IPv6 /32 announced from Poland, four and a half thousand addresses, across three observed BGP neighbours.

Notable

• The AS handle is a whole sentence, spelling out that this is an academic network dedicated to a metropolitan area network, then naming it.
• Two blocks carry netnames combining a university's three initials, the roaming service's name, the country code, and the block's own third octet.
• The role handle on those blocks uses three initials that differ from the netname's by a single letter, which is what a university renaming leaves behind.
• The largest block's netname is the country code, the network name and an allocation date.
• Nine addresses were queried for reverse DNS and none returned a name.

Interesting

• Naming the roaming network in a public registry field marks which addresses belong to visitors rather than staff. That is a useful hint for anyone deciding how much to trust traffic from them.
• Academic metropolitan networks are shared infrastructure. One number carries the university's own space and space registered to the wider network's operators, and the netnames are the only way to tell them apart.
• The mismatched initials preserve an institutional name change more reliably than most websites do.

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

Announced prefixes

• 212.87.224.0/20
• 212.87.251.0/24
• 212.87.253.0/24
• 2a01:698::/32

Upstream networks

• AS8501 Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center
• AS25084 Politechnika Czestochowska
• AS196844 Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center
• AS5617 Orange Polska Spolka Akcyjna

Adjacent networks

• AS8501 Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center
• AS25084 Politechnika Czestochowska
• AS196844 Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center
• AS5617 Orange Polska Spolka Akcyjna