asn.dev

Observed topology

AS46887 CROWNCASTLE-AS46887 - Crown Castle Fiber LLC

Unclassified ARIN

Upstreams 2 carry this network
Downstreams 959 this network carries
Adjacent (IPv4) 957
Adjacent (IPv6) 105
Upstream graph Who carries AS46887, and who carries them, drawn as a map up to the transit-free core. 9 exchanges Where AS46887 physically turns up to peer, and its address on each fabric.

Transit

Upstream networks

inferred

Networks observed carrying traffic for AS46887: 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.

ASNetworkTypeFamiliesPaths seen
AS6461Zayo BandwidthTransitIPv4 IPv655,328
AS3356Level 3 Parent, LLCTransitIPv41

Transit

Downstream networks

All 959

Networks for which AS46887 was observed as the last hop before the origin, meaning it appears to provide them transit.

ASNetworkTypeFamiliesPaths seen
AS36352HostPapaHostingIPv433,960
AS23410Nassau County BOCESUnclassifiedIPv410,363
AS33132Crown Castle Fiber LLCUnclassifiedIPv4 IPv63,579
AS32531Fordham UniversityUnclassifiedIPv42,206
AS397115Electric Boat CorporationUnclassifiedIPv41,794
AS20442Yale-New Haven Health Services CorporationUnclassifiedIPv41,532
AS21704New York City Board of EducationUnclassifiedIPv41,282
AS395748NetSpeed LLCUnclassifiedIPv4 IPv61,190
AS27506Crown Castle Fiber LLCUnclassifiedIPv4997
AS27609USC-University HospitalUnclassifiedIPv4945

All 959 downstreams →

Adjacency

Adjacent networks

All 957

Every AS seen directly next to AS46887 in a routing path, in either direction.

ASNetworkTypeFamiliesPaths seen
AS6461Zayo BandwidthTransitIPv4 IPv6212,021
AS36352HostPapaHostingIPv437,160
AS33132Crown Castle Fiber LLCUnclassifiedIPv4 IPv611,715
AS23410Nassau County BOCESUnclassifiedIPv410,421
AS32531Fordham UniversityUnclassifiedIPv42,206
AS397115Electric Boat CorporationUnclassifiedIPv41,794
AS20442Yale-New Haven Health Services CorporationUnclassifiedIPv41,532
AS21704New York City Board of EducationUnclassifiedIPv41,282
AS395748NetSpeed LLCUnclassifiedIPv4 IPv61,268
AS27506Crown Castle Fiber LLCUnclassifiedIPv41,055

All 957 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-08 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 73.00M 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.