Network topology

Relationships come from RIS AS_PATH observations; direction represents path position, not a commercial contract or traffic direction.

AS9

Currently announcedSnapshot awaiting refresh

CMU-ROUTER - Carnegie Mellon University · CMU-ROUTER

Last observed9/29/2026, 05:48:20Open ASN profile →

AS9 relationship topology

Showing 5 / 5

AS9Carnegie Mellon Univers…

UpstreamDownstreamUncertain relationshipNodes are ordered by observed weight

SELECTED NODEAS3356LEVEL3 - Level 3 Parent, LLC

Relationship: Upstream
Observed weight: 136
ASN registration country: United States
Latest RIS data: 10/23/2026, 00:00:00

Open AS3356 profile →

All adjacent autonomous systems

The table preserves every relationship in the selected filter; graph limits and pagination never remove data.

5 relationships

ASN	Organization	Relationship	ASN registration country	RIS observation start	Latest RIS data	IPv4	IPv6
AS3356Observed weight 136	LEVEL3 - Level 3 Parent, LLC	Upstream	United States	8/19/2019, 00:00:00	10/23/2026, 00:00:00	163	0
AS6461Observed weight 123	ZAYO-6461 - Zayo Bandwidth	Upstream	United States	8/19/2019, 00:00:00	10/23/2026, 00:00:00	987	0
AS399855Observed weight 74	Network name pending collection	Upstream	Registration country pending sync	8/19/2019, 00:00:00	10/23/2026, 00:00:00	195	70
AS5050Observed weight 39	PSC-EXT - Pittsburgh Supercomputing Center	Upstream	United States	8/19/2019, 00:00:00	10/23/2026, 00:00:00	35	36
AS2153Observed weight 8	CENIC	Upstream	United States	8/19/2019, 00:00:00	10/23/2026, 00:00:00	8	0

CHA.LA ASN relationship snapshotRelationships are normalized by CHA.LA from collected routing observations and registration context.CHA.LA routing observations · registration context