Network topology

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

AS21973

Currently announcedSnapshot awaiting refresh

Xponet · XPONET

Last observed10/1/2026, 08:37:47Open ASN profile →

AS21973 relationship topology

Showing 4 / 4

AS21973Xponet

UpstreamDownstreamUncertain relationshipNodes are ordered by observed weight

SELECTED NODEAS33132CROWNCASTLE-AS33132 - Crown Castle Fiber LLC

Relationship: Upstream
Observed weight: 800
ASN registration country: United States
Latest RIS data: 10/1/2026, 00:00:00

Open AS33132 profile →

All adjacent autonomous systems

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

4 relationships

ASN	Organization	Relationship	ASN registration country	RIS observation start	Latest RIS data	IPv4	IPv6
AS33132Observed weight 800	CROWNCASTLE-AS33132 - Crown Castle Fiber LLC	Upstream	United States	8/21/2019, 00:00:00	10/1/2026, 00:00:00	4,064	996
AS3356Observed weight 204	LEVEL3 - Level 3 Parent, LLC	Upstream	United States	8/21/2019, 00:00:00	10/1/2026, 00:00:00	496	0
AS11749Observed weight 19	MPINET - MPInet	Upstream	United States	8/21/2019, 00:00:00	10/1/2026, 00:00:00	71	0
AS701Observed weight 5	UUNET - Verizon Business	Upstream	United States	8/21/2019, 00:00:00	10/1/2026, 00:00:00	25	0

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