Observed topology

AS33951 FORWEB Local internet provider city Lodz in Poland

Residential RIPE

Upstreams 6 carry this network

Downstreams 4 this network carries

Adjacent (IPv4) 11

Adjacent (IPv6) 0

Upstream graph Who carries AS33951, and who carries them, drawn as a map up to the transit-free core. 2 exchanges Where AS33951 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS33951: 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.

AS	Network	Type	Families	Paths seen
AS9002	RETN Limited	Unclassified	IPv4	185
AS6939	Hurricane Electric LLC	Transit	IPv4	69
AS3356	Level 3 Parent, LLC	Transit	IPv4	51
AS197091	METROPORT Sp. z o.o.	Residential	IPv4	45
AS24482	SG.GS	Hosting	IPv4	5
AS24748	Atman Sp. z o.o.	Hosting	IPv4	1

Transit

Downstream networks

inferred

Networks for which AS33951 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS56544	MARLENA Marek Zieba	Unclassified	IPv4	90
AS43435	INSITE Sp. z o.o.	Unclassified	IPv4	60
AS199091	The Best Media Halina Ostrowska	Unclassified	IPv4	9
AS212570	FIBERDOM Sp. z o.o.	Unclassified	IPv4	6

Adjacency

Adjacent networks

All 11

Every AS seen directly next to AS33951 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS9002	RETN Limited	Unclassified	IPv4	297
AS6939	Hurricane Electric LLC	Transit	IPv4	118
AS56544	MARLENA Marek Zieba	Unclassified	IPv4	90
AS43435	INSITE Sp. z o.o.	Unclassified	IPv4	62
AS3356	Level 3 Parent, LLC	Transit	IPv4	51
AS197091	METROPORT Sp. z o.o.	Residential	IPv4	49
AS24482	SG.GS	Hosting	IPv4	9
AS199091	The Best Media Halina Ostrowska	Unclassified	IPv4	9
AS212570	FIBERDOM Sp. z o.o.	Unclassified	IPv4	6
AS50263	A-Systems Sp. z o.o.	Unclassified	IPv4	2

All 11 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-11 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.47M 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.