subnet.im

AS6128Cablevision Systems Corp.

United StatesRegistryARINTypeEyeball

As of 29th September 2026, AS6128 (Cablevision Systems Corp.), an access network registered in the United States with ARIN, originates 91 IPv4 prefixes covering 7.4M addresses and 10 IPv6 prefixes. By IPv4 address space that makes it the 97th-largest of the 79,607 networks we see originating IPv4, and the 29th-largest of 18,442 in the United States. It is seen behind 27 upstream networks, most often AS6461 (Zayo Bandwidth) and AS3356 (Lumen (Level 3)), and in front of 3 downstream networks. 71% of its announcements have a valid RPKI ROA; 10 are RPKI-invalid. 88% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

91

IPv6 prefixes

10

IPv4 addresses

7.4M

IPv6 /64s

159B

Upstream graph

The networks AS6128 is seen behind, one and two hops out, drawn from real AS paths.

AS6128Toward the internet core
Upstream graph for AS6128: 12 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS6128Cablevision Syste…This networkAS3356Lumen (Level 3)AS3491PCCW Global (HK) …AS6461Zayo BandwidthAS6939Hurricane Electri…AS9002RETN LimitedAS3549Lumen (fka. Globa…AS2914NTT America, Inc.AS24516Virtutel Pty LtdAS58511Swoop (Anycast Gl…AS32590Valve CorporationAS18106Viewqwest Pte LtdAS20130Depaul University

Networks observed one and two hops upstream of AS6128 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

106

adjacent networks

Upstreams
2725%
Peers
7672%
Downstreams
33%

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

Upstreams of AS6128
NetworkCountryRelationshipPathsVantage pts
AS6461Zayo BandwidthUSPeer27,39298
AS3356Lumen (Level 3)USPeer24,058116
AS6939Hurricane Electric LLCUSPeer6,55858
AS3491PCCW Global (HK) Ltd.HKPeer5,83321
AS9002RETN LimitedGBPeer5,41017
AS174Cogent Communications, LLCUSPeer4,01886
AS6667Elisa OyjFIPeer2,7824
AS1299Arelion (fka. Telia Carrier)SEPeer2,684118
AS18106Viewqwest Pte LtdSGPeer2,2042
AS14537Continent 8 LLCUSPeer2,1884

Prefixes

All 101

The largest blocks AS6128 originates, widest first.

Largest prefixes originated by AS6128
PrefixAddressesVisibility
67.80.0.0/13524k81/82
68.192.0.0/13524k81/82
69.112.0.0/13524k81/82
69.120.0.0/13524k81/82
24.44.0.0/14262k82/82
24.184.0.0/14262k82/82
24.188.0.0/14262k82/82
47.16.0.0/14262k82/82
47.20.0.0/14262k82/82
67.80.0.0/14262k82/82

Routing health

How AS6128'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

  • Valid71.3%72
  • Invalid9.9%10
  • No ROA18.8%19

Propagation

  • Globally propagated90% of full-feed peers or more88.1%89
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%11.9%12

Prefix sizes

IPv4 — 91 prefixes

IPv6 — 10 prefixes

  • /2868.7B × /6410.0%1
  • /3017.2B × /6440.0%4
  • /324.3B × /6450.0%5

Recent changes

Announcements that started or stopped since 30th Aug 2026.

No announcement by AS6128 started or stopped in this period.

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