asn.dev

Observed topology

AS8501 PIONIER-AS Institute of Bioorganic Chemistry Polish Academy of Science, Poznan Supercomputing and Networking Center

Education ARIN

Upstreams 5 carry this network
Downstreams 23 this network carries
Adjacent (IPv4) 29
Adjacent (IPv6) 22
Upstream graph Who carries AS8501, and who carries them, drawn as a map up to the transit-free core. 0 exchanges Where AS8501 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS8501: the AS immediately before it in a routing path. Ranked by how many paths showed the relationship, which reflects how widely it is used, not how much traffic crosses it.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv6192
AS2603NORDUnetEducationIPv4 IPv6153
AS174Cogent Communications, LLCTransitIPv4 IPv685
AS20965GEANT VerenigingUnclassifiedIPv428
AS21320GEANT VerenigingUnclassifiedIPv4 IPv618

Transit

Downstream networks

All 23

Networks for which AS8501 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS8508Silesian University of Technology, Computer CentreEducationIPv4 IPv6801
AS15798University of Warmia and Mazury in Olsztyn, PolandUnclassifiedIPv4 IPv6521
AS25468Rzeszow University of TechnologyUnclassifiedIPv4 IPv6475
AS8865Politechnika BialostockaEducationIPv4440
AS15373Politechnika CzestochowskaUnclassifiedIPv4 IPv6394
AS12324Maria Curie-Sklodowska UniversityUnclassifiedIPv4 IPv6392
AS8267Academic Computer Centre CYFRONET AGHEducationIPv4 IPv6354
AS8256Lodz University of TechnologyEducationIPv4 IPv6351
AS8664University of WarsawEducationIPv4 IPv6321
AS24848Kielce University of TechnologyUnclassifiedIPv4 IPv6292

All 23 downstreams →

Adjacency

Adjacent networks

All 29

Every AS seen directly next to AS8501 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS3356Level 3 Parent, LLCTransitIPv4 IPv63,330
AS2603NORDUnetEducationIPv4 IPv63,021
AS174Cogent Communications, LLCTransitIPv4 IPv61,844
AS1887PANSTWOWY INSTYTUT BADAWCZYUnclassifiedIPv4 IPv61,651
AS8508Silesian University of Technology, Computer CentreEducationIPv4 IPv6801
AS20965GEANT VerenigingUnclassifiedIPv4 IPv6754
AS8865Politechnika BialostockaEducationIPv4561
AS12324Maria Curie-Sklodowska UniversityUnclassifiedIPv4 IPv6555
AS15798University of Warmia and Mazury in Olsztyn, PolandUnclassifiedIPv4 IPv6532
AS25468Rzeszow University of TechnologyUnclassifiedIPv4 IPv6525

All 29 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-03 10:00 UTC by route-views2,rrc00, as seen from 76 BGP vantage points across 74.45M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.

Inferred from path position, not from any declaration by either party. A network appearing here is carrying these routes; whether that is a paid transit arrangement, a backup, or something else is not something routing data can tell you. Adjacency is not the same as peering. Being next to each other in a path covers paid transit, settlement-free peering and customer connections alike, and routing data cannot distinguish them. Treat this as "these networks exchange routes", nothing more specific.

Cross-check against RIPEstat or BGP.tools, which observe from a different and larger set of vantage points.