Autonomous system
AS15373 CZESTMAN-AS Academic AS dedicated to Metropolitan Area Network CzestMAN
Unclassified RIPE
Summary
CzestMAN
education research isp infrastructure
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
/32announced 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
3 upstream, 0 downstream and 5 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-25, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3 prefixes · 4.61K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| PL | Poland | 4 |
Registry
Allocation record
- Registry
- RIPE
- Handle
AS15373- Registry name
- CZESTMAN-AS
- Registrant
- Politechnika Czestochowska
- Abuse contact
- abuse@man.pcz.pl
- Registered
- 1970-01-01
- Last changed
- 2018-09-04
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 8 valid, 0 with no ROA
- ROAs
- 8 authorising AS15373
- ASPA
- no ASPA record
- IRR
- 100% registered · 8 of 8 announcements
- Route objects
- 8 naming AS15373
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 443 networks and 1,779 prefixes, as published 2026-10-24. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere