subnet.im

AS20001Charter Communications Inc

United StatesRegistryARINTypeEyeball

As of 10th November 2026, AS20001 (Charter Communications Inc), an access network registered in the United States with ARIN, originates 558 IPv4 prefixes covering 7.9M addresses and 36 IPv6 prefixes. By IPv4 address space that makes it the 93rd-largest of the 80,733 networks we see originating IPv4, and the 28th-largest of 18,751 in the United States. It is seen behind 5 upstream networks, most often AS7843 (Spectrum (Charter)) and AS20115 (Spectrum (Charter)), and in front of 152 downstream networks. 95% of its announcements have a valid RPKI ROA; 3 are RPKI-invalid. 94% of its routes reach at least 90% of full-feed peers.

At a glance

IPv4 prefixes

558

IPv6 prefixes

36

IPv4 addresses

7.9M

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…AS20130Depaul UniversityAS132337Axclusive

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

315

adjacent networks

Upstreams
52%
Peers
15850%
Downstreams
15248%

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

Upstreams of AS20001
NetworkCountryRelationshipPathsVantage pts
AS7843Spectrum (Charter)USPeer53,778139
AS20115Spectrum (Charter)USPeer6,657139
AS6939Hurricane Electric LLCUSPeer21612
AS701Verizon BusinessUSPeer1207
AS6453TATA Communications (America) IncUSPeer3434

Prefixes

All 594

The largest blocks AS20001 originates, widest first.

Largest prefixes originated by AS20001
PrefixAddressesVisibility
76.168.0.0/13524k75/76
172.112.0.0/13524k75/76
23.240.0.0/14262k76/76
45.48.0.0/14262k76/76
76.80.0.0/14262k76/76
98.152.0.0/14262k76/76
104.32.0.0/14262k76/76
104.172.0.0/14262k76/76
172.88.0.0/14262k76/76
172.248.0.0/14262k76/76

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

  • Valid94.8%563
  • Invalid0.5%3
  • No ROA4.7%28

Propagation

  • Globally propagated90% of full-feed peers or more93.6%556
  • Partially propagated40% to 90%0.0%0
  • Seen by few peersUnder 40%6.4%38

Prefix sizes

IPv4 — 558 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 12th Oct 2026.

  • Withdrawn144.224.128.0/192nd Nov 2026
  • Withdrawn144.224.160.0/192nd Nov 2026
  • Withdrawn144.224.192.0/192nd Nov 2026
  • Withdrawn144.224.224.0/192nd Nov 2026
  • Withdrawn144.226.0.0/192nd Nov 2026
  • Withdrawn144.226.128.0/192nd Nov 2026
  • Withdrawn144.226.160.0/192nd Nov 2026
  • Withdrawn144.226.192.0/192nd Nov 2026
  • Withdrawn144.226.224.0/192nd Nov 2026
  • Withdrawn144.226.32.0/192nd Nov 2026
  • Withdrawn144.226.64.0/192nd Nov 2026
  • Withdrawn144.226.96.0/192nd Nov 2026

3 announced and 46 withdrawn in all; the most recent are shown.

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