Observed topology

AS398427 MARKLEY-NETWORK-SERVICES - Markley Network Services, LLC

Hosting ARIN

Upstreams 6 carry this network

Downstreams 16 this network carries

Adjacent (IPv4) 22

Adjacent (IPv6) 6

Upstream graph Who carries AS398427, and who carries them, drawn as a map up to the transit-free core. 1 exchange Where AS398427 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS398427: 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
AS6079	RCN	Residential	IPv4 IPv6	172
AS2914	NTT America, Inc.	Transit	IPv4 IPv6	129
AS6939	Hurricane Electric LLC	Transit	IPv4 IPv6	90
AS46887	Crown Castle Fiber LLC	Unclassified	IPv4 IPv6	89
AS11776	Breezeline	Residential	IPv4	72
AS174	Cogent Communications, LLC	Transit	IPv4 IPv6	70

Transit

Downstream networks

All 16

Networks for which AS398427 was observed as the last hop before the origin, meaning it appears to provide them transit.

AS	Network	Type	Families	Paths seen
AS62983	The Massachusetts Port Authority	Unclassified	IPv4	452
AS6932	EBSCO Publishing	Unclassified	IPv4	295
AS46964	The Broad Institute, Inc.	Unclassified	IPv4	295
AS5724	University of Massachusetts Medical School	Education	IPv4	191
AS40444	Constant Contact, Inc	Unclassified	IPv4	171
AS32926	Massachusetts State Lottery Commission	Unclassified	IPv4	119
AS19712	ZOLL Medical Corporation	Unclassified	IPv4 IPv6	91
AS26167	Markley Boston LLC	Hosting	IPv4	89
AS399313	TUFTS ASSOCIATED HEALTH PLANS, INC.	Unclassified	IPv4	61
AS11894	Service Credit Union	Unclassified	IPv4	60

All 16 downstreams →

Adjacency

Adjacent networks

All 22

Every AS seen directly next to AS398427 in a routing path, in either direction.

AS	Network	Type	Families	Paths seen
AS2914	NTT America, Inc.	Transit	IPv4 IPv6	863
AS6079	RCN	Residential	IPv4 IPv6	688
AS46887	Crown Castle Fiber LLC	Unclassified	IPv4 IPv6	535
AS62983	The Massachusetts Port Authority	Unclassified	IPv4	452
AS11776	Breezeline	Residential	IPv4	415
AS6932	EBSCO Publishing	Unclassified	IPv4	295
AS46964	The Broad Institute, Inc.	Unclassified	IPv4	295
AS6939	Hurricane Electric LLC	Transit	IPv4 IPv6	229
AS5724	University of Massachusetts Medical School	Education	IPv4	191
AS40444	Constant Contact, Inc	Unclassified	IPv4	171

All 22 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-14 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.46M 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.