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AS55209Hackensack University Medical Center

United StatesRegistryARIN

As of 10th November 2026, AS55209 (Hackensack University Medical Center), a network registered in the United States with ARIN, originates 4 IPv4 prefixes covering 1k addresses. By IPv4 address space that makes it the 36,486th-largest of the 80,723 networks we see originating IPv4, and the 8,241st-largest of 18,750 in the United States. It is seen behind 3 upstream networks, most often AS54004 (Cablevision Lightpath LLC) and AS3356 (Lumen (Level 3)). 75% of its announcements have 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

4

IPv6 prefixes

0

IPv4 addresses

1k

IPv6 /64s

0

Upstream graph

The networks AS55209 is seen behind, one and two hops out, drawn from real AS paths.

AS55209Toward the internet core
Upstream graph for AS55209: 8 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS55209Hackensack Univer…This networkAS1436Meridian Health S…AS3356Lumen (Level 3)AS54004Cablevision Light…AS6461Zayo BandwidthAS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS6128Cablevision Syste…AS6939Hurricane Electri…

Networks observed one and two hops upstream of AS55209 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

6

adjacent networks

Upstreams
350%
Peers
350%
Downstreams
00%

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

Upstreams of AS55209
NetworkCountryRelationshipPathsVantage pts
AS54004Cablevision Lightpath LLCUSPeer22876
AS3356Lumen (Level 3)USPeer7474
AS1436Meridian Health SystemUSPeer22

Prefixes

The largest blocks AS55209 originates, widest first.

Largest prefixes originated by AS55209
PrefixAddressesVisibility
8.27.78.0/2425676/76
24.38.86.0/2425676/76
198.148.152.0/2425676/76
198.148.153.0/2425676/76

Routing health

How AS55209'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

  • Valid75.0%3
  • Invalid0.0%0
  • No ROA25.0%1

Propagation

  • Globally propagated90% of full-feed peers or more100.0%4
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%0.0%0

Prefix sizes

IPv4 — 4 prefixes

Recent changes

Announcements that started or stopped since 11th Oct 2026.

No announcement by AS55209 started or stopped in this period.

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