ResearchRouting table, RPKI, IRR & looking glass

AS20001 Charter Communications Inc

AS20001 (TWC-20001-PACWEST) is registered to Charter Communications Inc in US, through ARIN. It originates 637 prefixes in the global routing table.

601
IPv4 prefixes
36
IPv6 prefixes
7,554,304
IPv4 addresses
88%
RPKI valid
Registration

Who holds AS20001

Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.

AS number
AS20001
Handle
TWC-20001-PACWEST
Organization
Charter Communications Inc
Country
US
Registry
ARIN
ASPA
None published
WHOIS recordARIN
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       20001
ASName:         TWC-20001-PACWEST
ASHandle:       AS20001
RegDate:        2001-03-13
Updated:        2018-11-27
Ref:            https://rdap.arin.net/registry/autnum/20001



OrgName:        Charter Communications Inc
OrgId:          CC-3517
Address:        6175 S. Willow Dr
City:           Greenwood Village
StateProv:      CO
PostalCode:     80111
Country:        US
RegDate:        2018-10-10
Updated:        2022-09-14
Comment:        Legacy Time Warner Cable IP Assets
Ref:            https://rdap.arin.net/registry/entity/CC-3517


OrgAbuseHandle: ABUSE19-ARIN
OrgAbuseName:   Abuse
OrgAbusePhone:  +1-877-777-2263 
OrgAbuseEmail:  abuse@charter.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE19-ARIN

OrgTechHandle: IPADD1-ARIN
OrgTechName:   IPAddressing
OrgTechPhone:  +1-866-248-7662 
OrgTechEmail:  PublicIPAddressing@charter.com
OrgTechRef:    https://rdap.arin.net/registry/entity/IPADD1-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
Routing

What AS20001 announces

Prefixes originated by AS20001 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).

IPv4 prefixes
601
IPv6 prefixes
36
IPv4 addresses
7,554,304 (29,509 /24s)
RPKI valid
563 88%
RPKI invalid
1
RPKI not found
73
ROAs naming AS20001
817
With an IRR route object
519 81%
Prefixes

Announced prefixes

Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.

IPv4 (601)
23.94.90.0/2423.94.106.0/2423.94.109.0/2423.94.135.0/2423.142.228.0/2423.240.0.0/1424.24.128.0/1724.25.192.0/1924.25.224.0/1924.30.128.0/1824.43.0.0/1624.43.192.0/1924.43.224.0/2024.94.0.0/1924.94.64.0/1924.123.116.0/2424.123.117.0/2424.123.120.0/2424.160.32.0/2024.160.48.0/2024.165.0.0/1824.165.64.0/1924.165.64.0/2024.199.0.0/1835.132.40.0/2140.183.128.0/2145.40.123.0/2445.48.0.0/1445.59.192.0/1845.148.135.0/2447.231.64.0/2047.231.128.0/2247.231.144.0/2347.231.146.0/2350.113.0.0/1650.113.0.0/1863.243.199.0/2464.105.74.0/2364.105.98.0/2364.105.109.0/2464.105.110.0/2364.105.125.0/2464.105.126.0/2364.105.128.0/2264.105.133.0/2464.105.134.0/2364.105.154.0/2364.105.160.0/2364.105.164.0/2264.105.168.0/2264.105.174.0/2364.105.176.0/2364.105.180.0/2264.105.184.0/2264.105.190.0/2364.105.192.0/2264.105.200.0/2364.105.206.0/2364.105.248.0/2264.105.252.0/2364.183.0.0/1764.183.152.0/2464.183.156.0/2364.183.168.0/2264.183.172.0/2265.28.212.0/2465.185.254.0/2465.185.255.0/2466.8.128.0/1766.17.129.0/2466.17.172.0/2366.17.174.0/2366.17.184.0/2466.27.0.0/1666.27.32.0/2066.27.192.0/1966.53.160.0/2266.74.0.0/1566.74.112.0/2066.75.0.0/1666.75.64.0/1866.91.0.0/1666.91.224.0/1966.146.237.0/2466.167.12.0/2366.234.230.0/2366.234.236.0/2366.234.240.0/2366.234.248.0/2367.49.0.0/1667.49.128.0/1867.52.64.0/1967.52.96.0/1967.52.128.0/1867.53.32.0/1967.53.112.0/2067.53.192.0/1967.103.24.0/2367.103.27.0/2467.103.194.0/2367.103.196.0/2267.103.200.0/2267.103.204.0/2367.216.236.0/2467.216.237.0/2468.182.208.0/2268.182.216.0/2269.31.64.0/2369.31.66.0/2369.58.65.0/2469.58.66.0/2469.58.69.0/2469.58.71.0/2469.58.72.0/2469.58.76.0/2469.58.77.0/2469.58.78.0/2469.58.79.0/2469.58.89.0/2469.58.90.0/24
Show 481 more
69.58.91.0/2469.63.80.0/2169.63.93.0/2469.63.94.0/2369.75.0.0/1669.174.69.0/2469.174.104.0/2369.174.120.0/2470.93.0.0/1670.95.0.0/1672.14.92.0/2472.14.94.0/2472.37.154.0/2372.37.160.0/2372.37.164.0/2372.37.168.0/2372.37.174.0/2372.37.214.0/2372.37.238.0/2372.37.240.0/2372.37.246.0/2372.129.0.0/1772.130.0.0/1672.130.192.0/1872.132.0.0/1672.134.0.0/1674.50.16.0/2474.50.17.0/2474.50.18.0/2474.50.19.0/2474.50.20.0/2474.50.21.0/2474.50.22.0/2474.50.23.0/2474.50.24.0/2474.50.25.0/2474.50.26.0/2474.50.27.0/2474.50.28.0/2474.50.29.0/2474.50.30.0/2474.50.31.0/2474.62.0.0/1874.62.144.0/2074.62.168.0/2174.62.176.0/2074.62.192.0/1874.82.112.0/2074.87.0.0/1874.87.40.0/2374.87.48.0/2074.87.133.0/2474.87.134.0/2474.87.136.0/2474.87.137.0/2474.87.144.0/2374.87.148.0/2374.87.156.0/2474.87.157.0/2474.87.158.0/2374.87.188.0/2374.87.200.0/2174.87.208.0/2174.87.236.0/2274.87.241.0/2474.87.243.0/2474.199.188.0/2474.199.189.0/2474.211.128.0/1874.211.192.0/1974.211.224.0/2174.211.240.0/2075.80.0.0/1675.80.64.0/2075.80.192.0/1975.81.176.0/2075.82.0.0/1575.84.0.0/1575.85.0.0/1775.85.128.0/1975.87.224.0/2076.32.0.0/1576.39.0.0/1876.50.0.0/1576.53.0.0/1676.54.0.0/1776.58.24.0/2476.58.25.0/2476.58.26.0/2376.79.64.0/1876.79.92.0/2276.79.128.0/1776.80.0.0/1476.80.224.0/2076.81.64.0/1976.81.64.0/2376.81.68.0/2276.81.72.0/2176.81.96.0/2076.81.112.0/2376.81.224.0/2076.81.240.0/2076.83.128.0/1776.86.0.0/1576.88.0.0/1676.88.128.0/1876.89.44.0/2276.89.48.0/2276.89.56.0/2376.89.64.0/1876.89.128.0/1776.90.0.0/1576.93.0.0/1676.93.192.0/1976.94.0.0/1576.166.0.0/1576.166.16.0/2276.166.128.0/1776.168.0.0/1376.172.0.0/1876.172.112.0/2176.173.0.0/1676.176.0.0/1676.178.6.0/2376.178.8.0/2276.178.12.0/2376.178.14.0/2476.178.15.0/2476.178.32.0/1976.178.64.0/1876.178.96.0/2376.178.98.0/2376.178.104.0/2476.178.105.0/2476.178.106.0/2476.178.107.0/2476.178.110.0/2376.178.112.0/2376.178.114.0/2476.178.115.0/2476.178.116.0/2276.178.124.0/2376.178.126.0/2388.209.203.0/2488.209.230.0/2488.209.255.0/2488.216.21.0/2488.216.103.0/2488.216.185.0/2488.216.212.0/2489.23.81.0/2489.34.171.0/2489.187.20.0/2498.145.0.0/1898.145.36.0/2298.145.128.0/1798.145.245.0/2498.147.0.0/1698.147.0.0/1898.147.96.0/1998.147.112.0/2098.147.120.0/2198.147.128.0/1798.148.0.0/1598.150.0.0/1598.150.128.0/1798.151.0.0/1698.152.0.0/1498.152.96.0/2398.154.116.0/2298.155.0.0/1798.155.128.0/1798.157.128.0/20101.60.0.0/17101.60.128.0/18101.60.192.0/19101.60.224.0/20101.60.240.0/21101.60.248.0/22101.60.252.0/23101.61.0.0/17101.61.128.0/18101.61.192.0/19101.61.224.0/20101.61.240.0/21101.61.248.0/22101.61.252.0/23101.61.254.0/24102.129.191.0/24102.129.247.0/24104.32.0.0/14104.129.254.0/24104.172.0.0/14104.224.81.0/24104.234.122.0/24104.244.102.0/24108.178.128.0/18130.44.200.0/24130.44.202.0/24130.254.103.0/24130.254.112.0/24130.254.113.0/24138.229.96.0/24138.229.98.0/24138.229.99.0/24139.177.147.0/24140.99.43.0/24141.164.91.0/24142.129.0.0/16142.147.109.0/24143.223.133.0/24144.224.128.0/19144.224.160.0/19144.224.192.0/19144.224.224.0/19144.226.0.0/19144.226.32.0/19144.226.64.0/19144.226.96.0/19144.226.128.0/19144.226.160.0/19144.226.192.0/19144.226.224.0/19144.230.128.0/19144.230.160.0/19144.230.192.0/19144.230.224.0/19147.53.112.0/24147.53.113.0/24147.53.114.0/24147.53.115.0/24147.53.118.0/24147.53.121.0/24147.53.122.0/24150.224.182.0/24150.224.224.0/23150.224.226.0/24150.224.248.0/24152.44.100.0/24152.44.101.0/24152.44.102.0/24152.44.103.0/24155.229.8.0/21155.229.24.0/21155.229.32.0/20155.229.56.0/21155.229.64.0/21155.229.104.0/21155.229.112.0/20155.229.212.0/22155.229.224.0/20157.145.212.0/24158.62.218.0/24158.62.221.0/24159.56.0.0/22162.221.208.0/23162.221.210.0/23162.253.178.0/24163.5.33.0/24165.162.0.0/17165.162.128.0/19167.160.74.0/24167.160.78.0/24167.160.79.0/24167.167.44.0/24168.91.35.0/24168.91.38.0/24168.91.40.0/24168.91.41.0/24168.148.64.0/19168.148.240.0/21170.151.128.0/19170.151.160.0/19170.199.224.0/24170.199.225.0/24170.199.226.0/24170.199.228.0/24170.199.229.0/24172.81.112.0/24172.81.113.0/24172.81.114.0/24172.81.115.0/24172.88.0.0/14172.96.80.0/24172.96.82.0/24172.96.84.0/24172.96.87.0/24172.96.90.0/24172.96.92.0/24172.96.93.0/24172.96.95.0/24172.112.0.0/13172.248.0.0/14173.196.0.0/16173.197.64.0/18173.197.88.0/21173.197.96.0/20173.197.160.0/20173.197.208.0/20173.197.210.0/23173.197.216.0/21173.198.0.0/17173.198.64.0/19173.198.88.0/21173.205.6.0/23173.205.8.0/23173.205.14.0/23173.205.18.0/23173.205.22.0/23173.205.70.0/23173.205.74.0/23173.205.78.0/23173.205.98.0/23173.205.114.0/23173.239.241.0/24173.239.244.0/24191.1.0.0/18191.1.64.0/18191.1.128.0/18191.1.192.0/18192.60.0.0/18192.61.0.0/21192.61.40.0/23192.61.46.0/23192.61.48.0/24192.62.215.0/24192.138.101.0/24192.138.172.0/24192.150.116.0/24192.171.82.0/24192.171.88.0/24192.219.232.0/23198.1.212.0/24198.1.213.0/24198.1.214.0/24198.1.215.0/24198.1.220.0/24198.1.221.0/24198.1.222.0/24198.1.223.0/24198.1.232.0/24198.2.32.0/19198.15.208.0/21198.23.222.0/24198.60.183.0/24198.72.128.0/17198.99.76.0/24198.190.246.0/24199.12.32.0/19199.12.48.0/24199.12.64.0/19199.12.160.0/19199.12.192.0/19199.12.224.0/19199.13.32.0/19199.13.64.0/19199.13.96.0/19199.13.160.0/19199.13.192.0/19199.13.224.0/19199.14.0.0/19199.14.32.0/19199.14.64.0/19199.14.96.0/19199.14.128.0/19199.14.160.0/19199.14.192.0/19199.14.224.0/19199.33.78.0/24199.162.0.0/19199.162.32.0/19199.162.64.0/19199.162.96.0/19199.162.128.0/19199.162.160.0/19199.162.224.0/19199.250.188.0/24199.250.189.0/24199.253.216.0/24199.253.226.0/24199.254.2.0/24199.254.3.0/24199.254.4.0/24199.254.5.0/24204.130.155.0/24204.130.172.0/24204.140.250.0/24204.210.0.0/18204.210.96.0/19204.215.64.0/19204.215.96.0/19204.229.219.0/24204.229.220.0/22204.229.234.0/24204.237.128.0/23204.237.140.0/23204.237.172.0/23204.237.180.0/23204.237.190.0/23204.237.192.0/23204.237.204.0/23204.237.208.0/23204.237.246.0/23204.237.254.0/23205.142.110.0/24205.179.128.0/18205.179.192.0/20205.179.224.0/20206.135.128.0/20206.135.192.0/19206.201.240.0/20206.206.110.0/24206.217.64.0/23206.217.72.0/23206.217.76.0/23206.217.82.0/23206.217.88.0/23206.217.98.0/23206.217.104.0/21206.217.112.0/20206.251.0.0/24206.251.1.0/24206.251.2.0/24206.251.3.0/24206.251.4.0/24206.251.5.0/24206.251.6.0/24206.251.7.0/24206.251.8.0/24206.251.9.0/24206.251.10.0/24206.251.11.0/24206.251.12.0/24206.251.13.0/24206.251.14.0/24206.251.15.0/24207.145.224.0/20207.168.0.0/20207.168.32.0/20207.168.64.0/20207.168.96.0/20207.168.128.0/17207.182.24.0/24207.182.29.0/24207.254.91.0/24207.254.92.0/24207.254.93.0/24208.77.72.0/22208.89.240.0/24208.89.241.0/24208.89.242.0/24208.113.6.0/23208.113.16.0/23208.113.22.0/23208.113.32.0/23208.113.46.0/23208.113.48.0/23208.113.58.0/23208.116.222.0/23209.59.253.0/24209.101.32.0/20209.120.148.0/23209.163.116.0/24209.163.117.0/24209.163.118.0/24209.163.119.0/24209.166.48.0/20216.122.190.0/24216.133.0.0/18216.133.64.0/19216.133.112.0/20216.133.192.0/21216.133.200.0/23216.133.208.0/23216.133.216.0/21216.213.27.0/24216.224.117.0/24216.230.30.0/24216.230.31.0/24216.254.16.0/20216.254.64.0/20
IPv6 (36)
2600:5c00::/322600:5c00:11a3::/482600:5c00:2000::/362600:5c00:3a88::/482600:5c00:3b7c::/482600:5c00:f8e4::/482600:6c7f:93c0::/442600:6c7f:9410::/442602:107:4a10::/442602:107:4e00::/402602:107:4e10::/442602:107:4e12::/482602:107:4e15::/482602:107:4e17::/482602:107:e300::/402602:107:e600::/402603:8000::/282603:8001:cb00::/402603:8001:cc00::/402603:800c::/302603:8020::/332603:803d::/322605:e000::/322605:e000:40a::/482605:e000:1100::/402605:e000:c000::/362605:e000:d000::/362605:e000:e000::/372605:e000:e800::/382605:e000:ec00::/392605:e000:ee00::/402605:e000:ef00::/412605:e000:ef80::/422605:e000:efc0::/422606:6000::/322606:6000:7fc0::/48

RPKI valid   RPKI invalid   no ROA covers it

Neighbors

Who AS20001 is reached through

The AS just before AS20001 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.

AS7843 TWC-7843-BB 57AS6939 HURRICANE 3AS20115 CHARTER-20115 2
ASPA

Provider authorization

AS20001 publishes no ASPA of its own. 1 AS name it as a provider in theirs. Check a path.

The 1 ASes that name AS20001 as a provider
AS14460 HORIZON
IRR

Routing registry objects

From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.

Sourceas-nameMaintained by
ARINCharter-Communications-TWC-20001-PACWESTMNT-CC-3517
RADBRoadrunnerMAINT-RR

Route objects with origin AS20001: RADB 598 · ARIN 576 · APNIC 511 · RIPE 29 · LEVEL3 23

as-sets that list AS20001 (22)
AS-40300-IX-CUSTOMERSAS-CHTR-CC-3517AS-CHTR-CC-3518AS-CHTR-CC-4423AS-CHTR-CC04AS-CHTR-SYNCAS-COMPUTEARIZONAAS-COMPUTEAZAS-HN-104-SD-001AS-HURRICANEAS-HURRICANEV6AS-LEVEL3-CUSTOMERS-NAAS-LEVEL3-ORIGINS-NAAS-LUMEN-CUSTOMERS-ASNSAS-RR-RESAS-XO-BAS14801:AS-PEERSAS199746:AS-BLACKLISTAS204464:AS-BLACKLISTAS26212:AS-DRF-IX-PEERSAS37164:AS-ALLAS40300:AS-IX-CUSTOMERS
Tools

Check AS20001 live

ASN lookup and WHOISRPKI validatorASPA validatorIRR lookup