subnet.im

AS20001Charter Communications Inc

United StatesRegistryARINTypeEyeball

As of 26th September 2026, AS20001 (Charter Communications Inc), an access network registered in the United States with ARIN, originates 601 IPv4 prefixes covering 8.2M addresses and 36 IPv6 prefixes. By IPv4 address space that makes it the 84th-largest of the 79,516 networks we see originating IPv4, and the 26th-largest of 18,424 in the United States. It is seen behind 5 upstream networks, most often AS7843 (Spectrum (Charter)) and AS20115 (Spectrum (Charter)), and in front of 147 downstream networks. 88% of its announcements have a valid RPKI ROA; 1 is RPKI-invalid. 95% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

601

IPv6 prefixes

36

IPv4 addresses

8.2M

IPv6 /64s

106B

Upstream graph

The networks AS20001 is seen behind, one and two hops out, drawn from real AS paths.

AS20001Toward the internet core
Upstream graph for AS20001: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS20001Charter Communica…This networkAS701Verizon BusinessAS6453TATA Communicatio…AS6939Hurricane Electri…AS7843Spectrum (Charter)AS20115Spectrum (Charter)AS3356Lumen (Level 3)AS8220COLTAS35280F5 Networks SARLAS1299Arelion (fka. Tel…AS18106Viewqwest Pte LtdAS20130Depaul University

Networks observed one and two hops upstream of AS20001 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

309

adjacent networks

Upstreams
52%
Peers
15751%
Downstreams
14748%

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

Upstreams of AS20001
NetworkCountryRelationshipPathsVantage pts
AS7843Spectrum (Charter)USPeer60,723145
AS20115Spectrum (Charter)USPeer7,827145
AS6939Hurricane Electric LLCUSPeer21612
AS701Verizon BusinessUSPeer1177
AS6453TATA Communications (America) IncUSPeer3030

Prefixes

All 637

The largest blocks AS20001 originates, widest first.

Largest prefixes originated by AS20001
PrefixAddressesVisibility
76.168.0.0/13524k80/81
172.112.0.0/13524k80/81
23.240.0.0/14262k81/81
45.48.0.0/14262k81/81
76.80.0.0/14262k81/81
98.152.0.0/14262k81/81
104.32.0.0/14262k81/81
104.172.0.0/14262k81/81
172.88.0.0/14262k81/81
172.248.0.0/14262k81/81

Routing health

How AS20001'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

  • Valid88.4%563
  • Invalid0.2%1
  • No ROA11.5%73

Propagation

  • Globally propagated90% of full-feed peers or more94.7%603
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%5.3%34

Prefix sizes

IPv4 — 601 prefixes

IPv6 — 36 prefixes

  • /2868.7B × /642.8%1
  • /3017.2B × /642.8%1
  • /324.3B × /6411.1%4
  • /332.1B × /642.8%1
  • /36268M × /648.3%3
  • /37134M × /642.8%1
  • /3867.1M × /642.8%1
  • /3933.6M × /642.8%1
  • /4016.8M × /6419.4%7
  • /418.4M × /642.8%1
  • /424.2M × /645.6%2
  • /441M × /6411.1%4
  • /4865.5k × /6425.0%9

Recent changes

Announcements that started or stopped since 27th Aug 2026.

45 announced and 17 withdrawn in all; the most recent are shown.

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