Network topology

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

AS4539

Currently announcedSnapshot awaiting refresh

SEL-AS - Schweitzer Engineering Laboratories, Inc. · SEL-AS

Last observed9/29/2026, 11:44:26Open ASN profile →

AS4539 relationship topology

Showing 5 / 5

AS4539Schweitzer Engineering …

UpstreamDownstreamUncertain relationshipNodes are ordered by observed weight

SELECTED NODEAS209CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC

Relationship: Upstream
Observed weight: 255
ASN registration country: United States
Latest RIS data: 9/29/2026, 00:00:00

Open AS209 profile →

All adjacent autonomous systems

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5 relationships

ASN	Organization	Relationship	ASN registration country	RIS observation start	Latest RIS data	IPv4
AS209Observed weight 255	CENTURYLINK-US-LEGACY-QWEST - CenturyLink Communications, LLC	Upstream	United States	8/19/2019, 00:00:00	9/29/2026, 00:00:00	333
AS23138Observed weight 127	FIRST STEP INTERNET, LLC	Upstream	United States	8/19/2019, 00:00:00	9/29/2026, 00:00:00	164
AS20055Observed weight 84	AS-WHOLESAIL - Wholesail networks LLC	Upstream	United States	8/19/2019, 00:00:00	9/29/2026, 00:00:00	129
AS3356Observed weight 69	LEVEL3 - Level 3 Parent, LLC	Upstream	United States	8/19/2019, 00:00:00	9/29/2026, 00:00:00	89
AS7018Observed weight 1	ATT-INTERNET4 - AT&T Enterprises, LLC	Uncertain relationship	United States	8/19/2019, 00:00:00	9/29/2026, 00:00:00	1

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