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AS33132Zayo Bandwidth

United StatesRegistryARINTypeCarrier

As of 10th November 2026, AS33132 (Zayo Bandwidth), a transit carrier registered in the United States with ARIN, originates 50 IPv4 prefixes covering 140k addresses and 23 IPv6 prefixes. By IPv4 address space that makes it the 1,780th-largest of the 80,733 networks we see originating IPv4, and the 522nd-largest of 18,751 in the United States. It is seen behind 1 upstream network, most often AS46887 (Zayo (fka. Crown Castle)), and in front of 93 downstream networks. None of its announcements have a valid RPKI ROA. 99% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

50

IPv6 prefixes

23

IPv4 addresses

140k

IPv6 /64s

4.3B

Upstream graph

The networks AS33132 is seen behind, one and two hops out, drawn from real AS paths.

AS33132Toward the internet core
Upstream graph for AS33132: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS33132Zayo BandwidthThis networkAS46887Zayo (fka. Crown …AS3356Lumen (Level 3)AS6461Zayo Bandwidth

Networks observed one and two hops upstream of AS33132 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

189

adjacent networks

Upstreams
11%
Peers
9550%
Downstreams
9349%

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

Upstreams of AS33132
NetworkCountryRelationshipPathsVantage pts
AS46887Zayo (fka. Crown Castle)USPeer16,455138

Prefixes

All 73

The largest blocks AS33132 originates, widest first.

Largest prefixes originated by AS33132
PrefixAddressesVisibility
170.55.0.0/1665.5k76/76
167.93.0.0/1732.8k76/76
45.73.144.0/204.1k76/76
69.80.64.0/204.1k76/76
45.42.56.0/212k76/76
74.120.40.0/212k76/76
104.219.176.0/212k76/76
162.213.144.0/212k76/76
162.246.136.0/212k76/76
162.252.120.0/212k76/76

Routing health

How AS33132'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

  • Valid0.0%0
  • Invalid0.0%0
  • No ROA100.0%73

Propagation

  • Globally propagated90% of full-feed peers or more98.6%72
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%1.4%1

Prefix sizes

IPv4 — 50 prefixes

IPv6 — 23 prefixes

  • /324.3B × /644.3%1
  • /4016.8M × /644.3%1
  • /4865.5k × /6491.3%21

Recent changes

Announcements that started or stopped since 12th Oct 2026.

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