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AS64251Monona Terrace Community and Convention Center

United StatesRegistryARIN

As of 26th September 2026, AS64251 (Monona Terrace Community and Convention…), a network registered in the United States with ARIN, originates 1 IPv4 prefix covering 256 addresses and 1 IPv6 prefix. By IPv4 address space that makes it the 59,122nd-largest of the 79,516 networks we see originating IPv4, and the 12,871st-largest of 18,424 in the United States. It is seen behind 2 upstream networks, most often AS53597 (Hoyos Consulting LLC) and AS25979 (CITY OF MADISON). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

1

IPv6 prefixes

1

IPv4 addresses

256

IPv6 /64s

65.5k

Upstream graph

The networks AS64251 is seen behind, one and two hops out, drawn from real AS paths.

AS64251Toward the internet core
Upstream graph for AS64251: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS64251Monona Terrace Co…This networkAS25979CITY OF MADISONAS53597Hoyos Consulting …AS2381WiscNetAS3257GTT Communication…AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS64251 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

4

adjacent networks

Upstreams
250%
Peers
250%
Downstreams
00%

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

Upstreams of AS64251
NetworkCountryRelationshipPathsVantage pts
AS53597Hoyos Consulting LLCUSPeer142142
AS25979CITY OF MADISONUSPeer22

Prefixes

The largest blocks AS64251 originates, widest first.

Largest prefixes originated by AS64251
PrefixAddressesVisibility
205.213.215.0/2425681/81
2001:4e0:1050::/4865.5k × /6463/64

Routing health

How AS64251'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

  • Valid100.0%2
  • Invalid0.0%0
  • No ROA0.0%0

Propagation

  • Globally propagated90% of full-feed peers or more100.0%2
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 1 prefixes

IPv6 — 1 prefixes

  • /4865.5k × /64100.0%1

Recent changes

Announcements that started or stopped since 28th Aug 2026.

No announcement by AS64251 started or stopped in this period.

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