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AS46887Zayo (fka. Crown Castle)

United StatesRegistryARINTypeCarrier

As of 26th September 2026, AS46887 (Zayo (fka. Crown Castle)), a transit carrier registered in the United States with ARIN, originates 798 IPv4 prefixes covering 1.3M addresses and 254 IPv6 prefixes. By IPv4 address space that makes it the 383rd-largest of the 79,516 networks we see originating IPv4, and the 92nd-largest of 18,424 in the United States. It is seen behind 2 upstream networks, most often AS6461 (Zayo Bandwidth) and AS1299 (Arelion (fka. Telia Carrier)), and in front of 966 downstream networks. Under 1% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. Over 99% of its routes reach at least 90% of full-feed peers, and 7 prefixes are also originated by another network.

At a glance

IPv4 prefixes

798

IPv6 prefixes

254

IPv4 addresses

1.3M

IPv6 /64s

19.3B

Upstream graph

The networks AS46887 is seen behind, one and two hops out, drawn from real AS paths.

AS46887Toward the internet core
Upstream graph for AS46887: 6 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS46887Zayo (fka. Crown …This networkAS1299Arelion (fka. Tel…AS6461Zayo BandwidthAS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS2914NTT America, Inc.AS32590Valve Corporation

Networks observed one and two hops upstream of AS46887 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

1,955

adjacent networks

Upstreams
20%
Peers
98750%
Downstreams
96649%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS46887
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer298,178145
AS1299Arelion (fka. Telia Carrier)SEPeer11

Prefixes

All 1,052

The largest blocks AS46887 originates, widest first.

Largest prefixes originated by AS46887
PrefixAddressesVisibility
9.179.0.0/1665.5k81/81
9.191.0.0/1665.5k81/81
131.239.0.0/1665.5k81/81
138.123.0.0/1665.5k81/81
144.121.0.0/1665.5k81/81
149.70.0.0/1665.5k81/81
160.72.0.0/1665.5k81/81
165.158.0.0/1665.5k81/81
209.160.128.0/1732.8k81/81
144.121.0.0/1816.4k81/81

Routing health

How AS46887's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid0.5%5
  • Invalid0.0%0
  • No ROA99.5%1,047

Propagation

  • Globally propagated90% of full-feed peers or more99.4%1,046
  • Partially propagated40% to 90%<0.1%1
  • Seen by few peersUnder 40%0.5%5

Prefix sizes

IPv4 — 798 prefixes

IPv6 — 254 prefixes

  • /324.3B × /641.6%4
  • /36268M × /642.8%7
  • /3933.6M × /642.8%7
  • /4016.8M × /640.8%2
  • /4865.5k × /6492.1%234

Recent changes

Announcements that started or stopped since 27th Aug 2026.

38 announced and 10 withdrawn in all; the most recent are shown.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.