asn.dev

Observed topology

AS43372 TELNAP

Upstreams 10 carry this network
Downstreams 16 this network carries
Adjacent (IPv4) 23
Adjacent (IPv6) 5

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS43372: 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
AS29535Orange Polska Spolka AkcyjnaUnclassifiedIPv4862
AS1299Arelion Sweden ABTransitIPv4228
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4133
AS3257GTT Communications Inc.TransitIPv474
AS9002RETN LimitedUnclassifiedIPv468
AS24482SG.GSHostingIPv4 IPv622
AS6939Hurricane Electric LLCTransitIPv621
AS20804Exatel S.A.UnclassifiedIPv413
AS29632Netassist International EOODUnclassifiedIPv62
AS201054Stowarzyszenie e-PoludnieUnclassifiedIPv61

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.

Transit

Downstream networks

inferred

Networks for which AS43372 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS51064Glowny Inspektorat Transportu DrogowegoUnclassifiedIPv4123
AS200648Centrum Personalizacji Dokumentow Ministerstwa Spraw Wewnetrznych i AdministracjiUnclassifiedIPv4 IPv6116
AS209388TOWARZYSTWO UBEZPIECZEN WZAJEMNYCH "TUW"UnclassifiedIPv498
AS211375MINISTERSTWO INFRASTRUKTURYUnclassifiedIPv466
AS203422Biblioteka NarodowaUnclassifiedIPv466
AS205481Clare Wifi Networks LimitedUnclassifiedIPv460
AS24597Panstwowy Instytut BadawczyUnclassifiedIPv454
AS48534Centrum Informatyki StatystycznejUnclassifiedIPv451
AS205107Network Experts sp. z o.o. sp. k.UnclassifiedIPv449
AS28950AGENCJA RESTRUKTURYZACJI I MODERNIZACJI ROLNICTWAUnclassifiedIPv447
AS198241Glowny Urzad Geodezji i KartografiiUnclassifiedIPv444
AS49200Sperasoft Poland Sp. z o.o.UnclassifiedIPv435
AS198442Totalizator Sportowy Sp. z o.o.UnclassifiedIPv432
AS210831Tramwaje Warszawskie sp. z o.o.UnclassifiedIPv430
AS197215Miejskie Przedsiebiorstwo Wodociagow i Kanalizacji w M.St. Warszawie S.A.UnclassifiedIPv415
AS8890University of WarsawEducationIPv414

Adjacency

Adjacent networks

28 shown

Every AS seen directly next to AS43372 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS29535Orange Polska Spolka AkcyjnaUnclassifiedIPv41,462
AS1299Arelion Sweden ABTransitIPv4297
AS6453TATA COMMUNICATIONS (AMERICA) INCTransitIPv4209
AS3257GTT Communications Inc.TransitIPv4136
AS51064Glowny Inspektorat Transportu DrogowegoUnclassifiedIPv4123
AS200648Centrum Personalizacji Dokumentow Ministerstwa Spraw Wewnetrznych i AdministracjiUnclassifiedIPv4 IPv6116
AS209388TOWARZYSTWO UBEZPIECZEN WZAJEMNYCH "TUW"UnclassifiedIPv498
AS9002RETN LimitedUnclassifiedIPv496
AS203422Biblioteka NarodowaUnclassifiedIPv466
AS211375MINISTERSTWO INFRASTRUKTURYUnclassifiedIPv466
AS6939Hurricane Electric LLCTransitIPv663
AS205481Clare Wifi Networks LimitedUnclassifiedIPv460
AS24597Panstwowy Instytut BadawczyUnclassifiedIPv454
AS48534Centrum Informatyki StatystycznejUnclassifiedIPv451
AS205107Network Experts sp. z o.o. sp. k.UnclassifiedIPv449
AS28950AGENCJA RESTRUKTURYZACJI I MODERNIZACJI ROLNICTWAUnclassifiedIPv447
AS198241Glowny Urzad Geodezji i KartografiiUnclassifiedIPv444
AS49200Sperasoft Poland Sp. z o.o.UnclassifiedIPv435
AS24482SG.GSHostingIPv4 IPv633
AS198442Totalizator Sportowy Sp. z o.o.UnclassifiedIPv432
AS210831Tramwaje Warszawskie sp. z o.o.UnclassifiedIPv430
AS20804Exatel S.A.UnclassifiedIPv419
AS197215Miejskie Przedsiebiorstwo Wodociagow i Kanalizacji w M.St. Warszawie S.A.UnclassifiedIPv415
AS8890University of WarsawEducationIPv414
AS29632Netassist International EOODUnclassifiedIPv66
AS201054Stowarzyszenie e-PoludnieUnclassifiedIPv63

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.

Interconnection

Exchange presence

recorded

Internet exchanges where Packet Clearing House has a port recorded for AS43372, largest fabric first. An exchange is shared switching where networks interconnect directly rather than paying a transit provider to carry traffic between them, so turning up at one is a deliberate choice about how this network wants to be reached. Each name opens that exchange's own page, with its peering LANs and every other network recorded on it. Recorded at 4 exchanges across 2 countries and 1 region.

ExchangeLocationTheir addressMember ports
DE-CIX FrankfurtFrankfurt, Germany80.81.192.901,073
TPIX - Internet ExchangeWarsaw, Poland195.149.232.73462
Equinix Internet Exchange WarsawWarsaw, Poland195.182.218.159300
Thinx IXWarsaw, Poland212.91.0.43192

Unlike the tables above, this is recorded rather than inferred. An address on a peering LAN is at that exchange by definition. Two carve-outs all the same. Member ports counts every participant at the exchange, not this network's ports, so read it as a size proxy. And an absent exchange means PCH has no record of it, not that the network is not there.

Provenance

Where this comes from

Derived from routing tables collected at 2026-08-08 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.02M route entries. These are observations from those vantage points, not a complete or authoritative view of the internet.

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

Exchange presence comes from a separate dataset: the directory collected 2026-08-08 by Packet Clearing House (https://www.pch.net/ixp/data), covering 1,327 exchanges and 93,137 recorded member ports, licensed CC BY-NC-SA 3.0.

PeeringDB is the better-known directory and is deliberately not the source here: its acceptable-use policy forbids the bulk storage this needs. The two answer different questions anyway. PeeringDB reports what an operator declares about itself; this reports what PCH has recorded.