subnet.im

AS54004Cablevision Lightpath LLC

United StatesRegistryARIN

As of 26th September 2026, AS54004 (Cablevision Lightpath LLC), a network registered in the United States with ARIN, originates 308 IPv4 prefixes covering 504k addresses and 40 IPv6 prefixes. By IPv4 address space that makes it the 720th-largest of the 79,480 networks we see originating IPv4, and the 179th-largest of 18,421 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 331 downstream networks. 89% of its announcements have a valid RPKI ROA; 16 are RPKI-invalid. 95% of its routes reach at least 90% of full-feed peers, and 5 prefixes are also originated by another network.

At a glance

IPv4 prefixes

308

IPv6 prefixes

40

IPv4 addresses

504k

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…AS8888xTom Pty LtdAS13030Init7 (Switzerlan…AS3356Lumen (Level 3)AS32590Valve CorporationAS18106Viewqwest Pte LtdAS20130Depaul University

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

676

adjacent networks

Upstreams
51%
Peers
34050%
Downstreams
33149%

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

Upstreams of AS54004
NetworkCountryRelationshipPathsVantage pts
AS6128Cablevision Systems Corp.USPeer79,874144
AS6939Hurricane Electric LLCUSPeer7,080144
AS1299Arelion (fka. Telia Carrier)SEPeer1,05133
AS174Cogent Communications, LLCUSPeer52124
AS6461Zayo BandwidthUSPeer40472

Prefixes

All 348

The largest blocks AS54004 originates, widest first.

Largest prefixes originated by AS54004
PrefixAddressesVisibility
47.19.0.0/1665.5k81/81
65.51.128.0/1732.8k81/81
69.74.128.0/1732.8k81/81
148.77.0.0/1732.8k81/81
65.51.64.0/1816.4k81/81
148.76.64.0/1816.4k81/81
148.76.128.0/1816.4k81/81
16.220.160.0/198.2k80/81
65.51.32.0/198.2k81/81
69.74.32.0/198.2k81/81

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

  • Valid89.1%310
  • Invalid4.6%16
  • No ROA6.3%22

Propagation

  • Globally propagated90% of full-feed peers or more94.8%330
  • Partially propagated40% to 90%0.6%2
  • Seen by few peersUnder 40%4.6%16

Prefix sizes

IPv4 — 308 prefixes

IPv6 — 40 prefixes

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

Recent changes

Announcements that started or stopped since 27th Aug 2026.

35 announced and 10 withdrawn in all; the most recent are shown.

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