asn.dev

Observed topology

AS46887 CROWNCASTLE-AS46887 - Crown Castle Fiber LLC

Unclassified ARIN NSP

Upstreams 2 carry this network
Downstreams 954 this network carries
Adjacent (IPv4) 953
Adjacent (IPv6) 104
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 IPv656,130
AS3356Level 3 Parent, LLCTransitIPv41

Transit

Downstream networks

All 954

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

ASNetworkTypeFamiliesPaths seen
AS36352HostPapaHostingIPv434,010
AS23410Nassau County BOCESUnclassifiedIPv410,542
AS33132Crown Castle Fiber LLCUnclassifiedIPv4 IPv63,630
AS32531Fordham UniversityUnclassifiedIPv42,244
AS397115Electric Boat CorporationUnclassifiedIPv41,826
AS20442Yale-New Haven Health Services CorporationUnclassifiedIPv41,562
AS21704New York City Board of EducationUnclassifiedIPv41,303
AS395748NetSpeed LLCUnclassifiedIPv4 IPv61,235
AS27506Crown Castle Fiber LLCUnclassifiedIPv41,014
AS4906Frontline CommunicationsHostingIPv4955

All 954 downstreams →

Adjacency

Adjacent networks

All 953

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

ASNetworkTypeFamiliesPaths seen
AS6461Zayo BandwidthTransitIPv4 IPv6215,010
AS36352HostPapaHostingIPv437,211
AS33132Crown Castle Fiber LLCUnclassifiedIPv4 IPv611,865
AS23410Nassau County BOCESUnclassifiedIPv410,601
AS32531Fordham UniversityUnclassifiedIPv42,244
AS397115Electric Boat CorporationUnclassifiedIPv41,826
AS20442Yale-New Haven Health Services CorporationUnclassifiedIPv41,562
AS395748NetSpeed LLCUnclassifiedIPv4 IPv61,315
AS21704New York City Board of EducationUnclassifiedIPv41,303
AS27506Crown Castle Fiber LLCUnclassifiedIPv41,073

All 953 adjacent →

Provenance

Where this comes from

Derived from routing tables collected at 2026-11-13 10:00 UTC by route-views2,rrc00, as seen from 75 BGP vantage points across 74.40M 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.