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AS6109NDCHealth Corporation

United StatesRegistryARIN

As of 22nd October 2026, AS6109 (NDCHealth Corporation), a network registered in the United States with ARIN, originates 23 IPv4 prefixes covering 6.4k addresses. By IPv4 address space that makes it the 13,657th-largest of the 79,663 networks we see originating IPv4, and the 3,973rd-largest of 18,476 in the United States. It is seen behind 2 upstream networks, most often AS3356 (Lumen (Level 3)) and AS7018 (AT&T Enterprises, LLC). None of its announcements have a valid RPKI ROA. 4% of its routes reach at least 90% of full-feed peers, and 22 prefixes are also originated by another network.

At a glance

IPv4 prefixes

23

IPv6 prefixes

0

IPv4 addresses

6.4k

IPv6 /64s

0

Upstream graph

The networks AS6109 is seen behind, one and two hops out, drawn from real AS paths.

AS6109Toward the internet core
Upstream graph for AS6109: 5 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS6109NDCHealth Corpora…This networkAS3356Lumen (Level 3)AS7018AT&T Enterprises,…AS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS1299Arelion (fka. Tel…

Networks observed one and two hops upstream of AS6109 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

5

adjacent networks

Upstreams
240%
Peers
360%
Downstreams
00%

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

Upstreams of AS6109
NetworkCountryRelationshipPathsVantage pts
AS3356Lumen (Level 3)USPeer7272
AS7018AT&T Enterprises, LLCUSPeer715

Prefixes

The largest blocks AS6109 originates, widest first.

Largest prefixes originated by AS6109
PrefixAddressesVisibility
206.227.216.0/235123/77
206.227.220.0/235123/77
63.175.205.0/242563/77
206.227.192.0/242563/77
206.227.193.0/242563/77
206.227.194.0/242563/77
206.227.195.0/242563/77
206.227.196.0/242563/77
206.227.199.0/242563/77
206.227.200.0/242563/77

Routing health

How AS6109'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%23

Propagation

  • Globally propagated90% of full-feed peers or more4.3%1
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%95.7%22

Prefix sizes

IPv4 — 23 prefixes

Recent changes

Announcements that started or stopped since 23rd Sept 2026.

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