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AS54004Cablevision Lightpath LLC

United StatesRegistryARIN

As of 10th November 2026, AS54004 (Cablevision Lightpath LLC), a network registered in the United States with ARIN, originates 348 IPv4 prefixes covering 568k addresses and 40 IPv6 prefixes. By IPv4 address space that makes it the 664th-largest of the 80,733 networks we see originating IPv4, and the 159th-largest of 18,751 in the United States. It is seen behind 5 upstream networks, most often AS6128 (Cablevision Systems Corp.) and AS6939 (Hurricane Electric LLC), and in front of 334 downstream networks. 91% of its announcements have a valid RPKI ROA; 17 are RPKI-invalid. 91% of its routes reach at least 90% of full-feed peers, and 6 prefixes are also originated by another network.

At a glance

IPv4 prefixes

348

IPv6 prefixes

40

IPv4 addresses

568k

IPv6 /64s

4.3B

Upstream graph

The networks AS54004 is seen behind, one and two hops out, drawn from real AS paths.

AS54004Toward the internet core
Upstream graph for AS54004: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS54004Cablevision Light…This networkAS174Cogent Communicat…AS1299Arelion (fka. Tel…AS6128Cablevision Syste…AS6461Zayo BandwidthAS6939Hurricane Electri…AS151326DCConnect Communi…AS13030Init7 (Switzerlan…AS16552Tiggee LLCAS2914NTT America, Inc.AS32590Valve CorporationAS20130Depaul UniversityAS132337Axclusive

Networks observed one and two hops upstream of AS54004 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

686

adjacent networks

Upstreams
51%
Peers
34751%
Downstreams
33449%

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

Upstreams of AS54004
NetworkCountryRelationshipPathsVantage pts
AS6128Cablevision Systems Corp.USPeer75,206138
AS6939Hurricane Electric LLCUSPeer6,545138
AS6461Zayo BandwidthUSPeer2,650110
AS1299Arelion (fka. Telia Carrier)SEPeer1,15135
AS174Cogent Communications, LLCUSPeer36821

Prefixes

All 388

The largest blocks AS54004 originates, widest first.

Largest prefixes originated by AS54004
PrefixAddressesVisibility
47.19.0.0/1665.5k76/76
65.51.128.0/1732.8k76/76
69.74.128.0/1732.8k76/76
148.77.0.0/1732.8k76/76
65.51.64.0/1816.4k76/76
148.76.64.0/1816.4k76/76
148.76.128.0/1816.4k76/76
16.220.160.0/198.2k76/76
65.51.32.0/198.2k76/76
69.74.32.0/198.2k76/76

Routing health

How AS54004'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

  • Valid90.7%352
  • Invalid4.4%17
  • No ROA4.9%19

Propagation

  • Globally propagated90% of full-feed peers or more91.2%354
  • Partially propagated40% to 90%2.6%10
  • Seen by few peersUnder 40%6.2%24

Prefix sizes

IPv4 — 348 prefixes

IPv6 — 40 prefixes

  • /324.3B × /642.5%1
  • /4865.5k × /6497.5%39

Recent changes

Announcements that started or stopped since 12th Oct 2026.

16 announced and 0 withdrawn in all; the most recent are shown.

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