asn.dev

Observed topology

AS39251 NETGUARD

Unclassified RIPE NSP

Upstreams 17 carry this network
Downstreams 4 this network carries
Adjacent (IPv4) 18
Adjacent (IPv6) 6
Upstream graph Who carries AS39251, and who carries them, drawn as a map up to the transit-free core. 3 exchanges Where AS39251 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

All 17

Networks observed carrying traffic for AS39251: 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
AS1299Arelion Sweden ABTransitIPv41,051
AS3356Level 3 Parent, LLCTransitIPv4 IPv6946
AS174Cogent Communications, LLCTransitIPv4624
AS6939Hurricane Electric LLCTransitIPv4 IPv6558
AS3257GTT Communications Inc.TransitIPv4510
AS8280SYNAPSECOM S.A. Provider of Telecommunications and Internet ServicesHostingIPv4 IPv674
AS3303Swisscom (Schweiz) AGResidentialIPv473
AS24482SG.GSHostingIPv473
AS33891Core-Backbone GmbHHostingIPv473
AS37721Virtual Technologies & SolutionsResidentialIPv473

All 17 upstreams →

Transit

Downstream networks

inferred

Networks for which AS39251 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS20818NETGUARD LLCUnclassifiedIPv4295
AS42446Viscomp LtdUnclassifiedIPv4270
AS47624NETGUARD LLCUnclassifiedIPv4118
AS39401Link+ LtdUnclassifiedIPv637

Adjacency

Adjacent networks

All 21

Every AS seen directly next to AS39251 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS1299Arelion Sweden ABTransitIPv41,167
AS3356Level 3 Parent, LLCTransitIPv4 IPv61,018
AS174Cogent Communications, LLCTransitIPv4918
AS6939Hurricane Electric LLCTransitIPv4 IPv6642
AS3257GTT Communications Inc.TransitIPv4582
AS20818NETGUARD LLCUnclassifiedIPv4295
AS42446Viscomp LtdUnclassifiedIPv4270
AS47624NETGUARD LLCUnclassifiedIPv4118
AS208972GIBIRNET ILETISIM HIZMETLERI SANAYI VE TICARET LIMITED SIRKETIUnclassifiedIPv495
AS8280SYNAPSECOM S.A. Provider of Telecommunications and Internet ServicesHostingIPv4 IPv682

All 21 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-10-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.25M 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.