Network topology

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

AS1637

Currently announcedSnapshot awaiting refresh

Headquarters, USAISC · DNIC-AS-01637

Last observed9/29/2026, 08:09:52Open ASN profile →

AS1637 relationship topology

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AS1637Headquarters, USAISC

UpstreamDownstreamUncertain relationshipNodes are ordered by observed weight

SELECTED NODEAS27066DNIC-ASBLK-27032-27159 - United States Department of Defense (DoD)

Relationship: Upstream
Observed weight: 629
ASN registration country: United States
Latest RIS data: 9/29/2026, 00:00:00

Open AS27066 profile →

All adjacent autonomous systems

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1 relationships

ASN	Organization	Relationship	ASN registration country	RIS observation start	Latest RIS data	IPv4	IPv6
AS27066Observed weight 629	DNIC-ASBLK-27032-27159 - United States Department of Defense (DoD)	Upstream	United States	8/19/2019, 00:00:00	9/29/2026, 00:00:00	36,768	335

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