Report for 12271

Name

TWC-12271-NYC - Charter Communications Inc, US

AS Adjacency Report

In the context of this report "Upstream" indicates that there is an adjacent AS that lines between the BGP table collection point (in this case at AS2.0) and the specified AS. Similarly, "Downstream" refers to an adjacent AS that lies beyond the specified AS. This upstream / downstream categorisation is strictly a description relative topology, and should not be confused with provider / customer / peer inter-AS relationships.

12271 TWC-12271-NYC - Charter Communications Inc, US

  Adjacency:    46  Upstream:     2  Downstream:    44
  Upstream Adjacent AS list
    AS6453          AS6453 - TATA COMMUNICATIONS AMERICA INC, US
    AS7843          TWC-7843-BB - Charter Communications Inc, US
  Downstream Adjacent AS list
    AS14460         HORIZON - Horizon Media, Inc., US
    AS18694         SDWARREN - Sappi Fine Paper North America, US
    AS23010         FFHSJ - Fried, Frank, Harris, Shriver & Jacobson LLP, US
    AS20252         JSIWMC - Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University, US
    AS18564         SJU149068 - St. Johns University, New York, US
    AS25891         SVA-ANS - School Of Visual Arts, Inc., US
    AS32474         PEERNYC - Peerless Clothing Inc., CA
    AS393569        9-11-MEMORIAL - 911 MEMORIAL, US
    AS40170         MTR0-01 - Intermetro Communications, Inc., US
    AS400392        EMPIRE-1 - Empire Resorts, Inc., US
    AS399601        601-LEXINGTON-BGP - etc.venues NYC LLC, US
    AS36100         MTC-BROADBAND - MTC Broadband, Inc., US
    AS5091          STRIPE - Stripe, Inc., US
    AS62566         STARBUCKS - Starbucks Coffee Company, US
    AS54795         BUILD-AMERICA-MUTUAL-ASSURANCE - Build America Mutual Assurance Company, US
    AS22303         NEWPALTZEDU - State University of New York at New Paltz, US
    AS395359        ITH-AS-1 - InTouch Health, US
    AS40458         CMIGNET - CMFG Life Insurance Company, US
    AS397595        MTAPD-LIC - MTAPD, US
    AS397352        MEDISYS-36 - Medisys Health Network, Inc., US
    AS32730         NAHQPU - LG CNS America Inc., US
    AS6292          MTAPD-GB - MTAPD, US
    AS54113         FASTLY - Fastly, Inc., US
    AS22209         RUDYS-AS - RUDYS INFLIGHT CATERING, US
    AS11606         ARCHTOP-FIBER-WVTC02 - Archtop Fiber, US
    AS14465         HITN-AS-1 - HITN, US
    AS19796         SHUBERT - Shubert Organization, Inc., US
    AS19794         CEMENTWORKS - The Cementworks LLC, US
    AS16770         ASTGEN - Astoria Generating Company, L.P., US
    AS27185         DHS-INTERNET - Danbury Hospital - ITG, US
    AS393753        AS393753 - The Brooklyn Hospital Center, US
    AS30012         ASN-UNIVERSAL-MUSIC-GROUP-INC - Universal Music Group, INC., US
    AS395060        MACMILLAN-PUBLISHERS - Macmillan Publishers Inc, US
    AS25669         TOWERPRODUCTS - MARKERTEK VIDEO SUPPLY, US
    AS400508        JS-ASN-01 - The Juilliard School, US
    AS401827        UNITED NATIONS FEDERAL CREDIT UNION - UNFCU, US
    AS395095        GARNET-HEALTH - Orange Regional Medical Center, US
    AS395090        GAGOSIAN-GALLERY - Gagosian Gallery, Inc, US
    AS55123         37589 - Brilliant JewelersMJJ Inc., US
    AS55273         360-MADDISON-BGP - etc.venues NYC LLC, US
    AS54226         SUNY-OPTOMETRY - SUNY College of Optometry, US
    AS46765         ASN1 - Liberum Capital Inc., US
    AS23325         MCL-ASN - Magnitude Capital, LLC, US
    AS14478         RECURSE-CENTER - Recurse Center, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
203   AS12271        ORG+TRN Originate:    2858496 /10.55  Transit:      81408 /15.69 TWC-12271-NYC - Charter Communications Inc, US

Aggregation Suggestions

        Filter: Aggregates, Specifics

This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.

 Rank AS            AS Name                                      Current  Wthdw  Aggte  Annce Redctn       %
 8480 AS12271       TWC-12271-NYC - Charter Communications Inc, U    107      7      2    102      5   4.67%


  Prefix               AS Path                              Aggregation Suggestion
  23.246.64.0/18       4777 2516 7843 12271   
  24.29.96.0/19        4777 2516 7843 12271   
  24.29.128.0/19       4777 2516 7843 12271   
  24.30.224.0/20       4777 2516 7843 12271   
  24.39.104.0/21       4777 2516 7843 12271   
  24.39.112.0/20       4777 2516 7843 12271   
  24.39.128.0/19       4777 2516 7843 12271   
  24.90.0.0/16         4777 2516 7843 12271   
  24.97.123.0/24       4777 2516 7843 12271   
  24.97.124.0/22       4777 2516 7843 12271   
  24.97.184.0/23       4777 2516 7843 12271   
  24.97.200.0/21       4777 2516 7843 12271   
  24.102.64.0/18       4777 2516 7843 12271   
  24.103.0.0/17        4777 2516 7843 12271   
  24.103.224.0/19      4777 2516 7843 12271   
  24.104.192.0/18      4777 2516 7843 12271   
  24.105.128.0/19      4777 2516 7843 12271   
  24.136.96.0/19       4777 2516 7843 12271   
  24.161.0.0/17        4777 2516 7843 12271   
  24.164.128.0/18      4777 2516 7843 12271   
  24.168.0.0/17        4777 2516 7843 12271   
  24.168.128.0/19      4777 2516 7843 12271   
  24.193.0.0/16        4777 2516 7843 12271   
  24.213.160.0/19      4777 2516 7843 12271   
  47.230.0.0/16        4777 2516 7843 12271   
  50.74.0.0/16         4777 2516 7843 12271   
  50.75.192.0/18       4777 2516 7843 12271   
  66.65.0.0/17         4777 2516 7843 12271   
  66.65.128.0/18       4777 2516 7843 12271   
  66.108.0.0/16        4777 2516 7843 12271   
  66.110.97.0/24       4777 2516 7843 12271   
  67.243.0.0/16        4777 2516 7843 12271   
  67.244.0.0/19        4777 2516 7843 12271   
  67.244.64.0/18       4777 2516 7843 12271   
  67.245.0.0/16        4777 2516 7843 12271   
  67.247.0.0/18        4777 2516 7843 12271   
  67.247.96.0/19       4777 2516 7843 12271   
  67.250.0.0/16        4777 2516 7843 12271   
  67.251.128.0/19      4777 2516 7843 12271   
  67.251.192.0/18      4777 2516 7843 12271   
  67.254.0.0/16        4777 2516 7843 12271   
  68.172.208.0/20      4777 2516 7843 12271   
  68.172.224.0/19      4777 2516 7843 12271   
  68.173.0.0/16        4777 2516 7843 12271   
  68.174.0.0/16        4777 2516 7843 12271   
  68.175.0.0/17        4777 2516 7843 12271   
  69.193.128.0/17      4777 2516 7843 12271 + Announce - aggregate of 69.193.128.0/18 (4777 2516 7843 12271) and 69.193.192.0/18 (4777 2516 7843 12271)
  69.193.128.0/18      4777 2516 7843 12271 - Withdrawn - aggregated with 69.193.192.0/18 (4777 2516 7843 12271)
  69.193.192.0/19      4777 2516 7843 12271 - Withdrawn - aggregated with 69.193.224.0/19 (4777 2516 7843 12271)
  69.193.224.0/19      4777 2516 7843 12271 - Withdrawn - aggregated with 69.193.192.0/19 (4777 2516 7843 12271)
  69.200.64.0/19       4777 2516 7843 12271   
  69.200.224.0/19      4777 2516 7843 12271   
  69.200.240.0/21      4777 6939 7843 12271   
  69.201.128.0/17      4777 2516 7843 12271   
  69.202.128.0/17      4777 2516 7843 12271   
  69.203.0.0/17        4777 2516 7843 12271   
  69.203.128.0/19      4777 2516 7843 12271   
  69.203.192.0/18      4777 2516 7843 12271   
  69.204.224.0/19      4777 2516 7843 12271   
  69.206.0.0/16        4777 2516 7843 12271   
  72.43.96.0/19        4777 2516 7843 12271   
  72.43.128.0/18       4777 2516 7843 12271   
  72.225.64.0/18       4777 2516 7843 12271   
  72.225.128.0/17      4777 2516 7843 12271   
  72.226.0.0/17        4777 2516 7843 12271   
  72.227.128.0/17      4777 2516 7843 12271   
  72.229.0.0/16        4777 2516 7843 12271   
  72.231.0.0/17        4777 2516 7843 12271   
  74.64.0.0/16         4777 2516 7843 12271   
  74.65.192.0/18       4777 2516 7843 12271   
  74.66.0.0/16         4777 2516 7843 12271   
  74.68.0.0/16         4777 2516 7843 12271   
  74.71.0.0/16         4777 2516 7843 12271   
  74.72.0.0/15         4777 2516 7843 12271   
  76.58.52.0/23        4777 2516 7843 12271   
  98.0.128.0/17        4777 2516 7843 12271   
  98.7.0.0/17          4777 2516 7843 12271   
  98.7.192.0/18        4777 2516 7843 12271   
  98.12.0.0/16         4777 2516 7843 12271   
  98.13.128.0/17       4777 2516 7843 12271   
  98.14.0.0/15         4777 2516 7843 12271   
  108.176.0.0/18       4777 2516 7843 12271   
  108.176.128.0/18     4777 2516 7843 12271   
  142.105.0.0/17       4777 6939 7843 12271   
  142.255.0.0/17       4777 6939 7843 12271   
  149.89.0.0/16        4777 6939 7843 12271   
  150.221.96.0/19      4777 6939 7843 12271   
  150.224.177.0/24     4777 6939 7843 12271   
  158.222.128.0/17     4777 6939 7843 12271   
  168.148.128.0/19     4777 2516 7843 12271   
  172.254.0.0/16       4777 2516 7843 12271   
  184.74.128.0/17      4777 2516 7843 12271   
  184.75.0.0/17        4777 2516 7843 12271   
  184.152.0.0/16       4777 2516 7843 12271   
  184.153.0.0/17       4777 2516 7843 12271   
  192.61.128.0/19      4777 2516 7843 12271   
  192.131.40.0/22      4777 6939 7843 12271   
  198.151.199.0/24     4777 2516 7843 12271   
  198.151.200.0/22     4777 2516 7843 12271 + Announce - aggregate of 198.151.200.0/23 (4777 2516 7843 12271) and 198.151.202.0/23 (4777 2516 7843 12271)
  198.151.200.0/24     4777 2516 7843 12271 - Withdrawn - aggregated with 198.151.201.0/24 (4777 2516 7843 12271)
  198.151.201.0/24     4777 2516 7843 12271 - Withdrawn - aggregated with 198.151.200.0/24 (4777 2516 7843 12271)
  198.151.202.0/24     4777 2516 7843 12271 - Withdrawn - aggregated with 198.151.203.0/24 (4777 2516 7843 12271)
  198.151.203.0/24     4777 2516 7843 12271 - Withdrawn - aggregated with 198.151.202.0/24 (4777 2516 7843 12271)
  198.179.64.0/19      4777 2516 7843 12271   
  204.210.128.0/19     4777 2516 7843 12271   
  207.251.238.0/23     4777 2516 7843 12271   
  208.105.0.0/18       4777 2516 7843 12271   
  208.105.64.0/19      4777 2516 7843 12271   
  208.125.0.0/19       4777 2516 7843 12271   

Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.

AS12271   93 More Specifics   107 Total Advertisements   TWC-12271-NYC - Charter Communications Inc, US
    24.29.96.0/19                 24.28.0.0/15
    24.29.128.0/19                24.28.0.0/15
    24.30.224.0/20                24.30.128.0/17
    24.39.104.0/21                24.39.0.0/16
    24.39.112.0/20                24.39.0.0/16
    24.39.128.0/19                24.39.0.0/16
    24.97.123.0/24                24.97.0.0/16
    24.97.124.0/22                24.97.0.0/16
    24.97.184.0/23                24.97.0.0/16
    24.97.200.0/21                24.97.0.0/16
    24.103.0.0/17                 24.103.0.0/16
    24.103.224.0/19               24.103.0.0/16
    24.105.128.0/19               24.105.128.0/18
    24.161.0.0/17                 24.160.0.0/13
    24.164.128.0/18               24.160.0.0/13
    24.168.0.0/17                 24.168.0.0/15
    24.168.128.0/19               24.168.0.0/15
    24.213.160.0/19               24.213.128.0/17
    47.230.0.0/16                 47.224.0.0/13
    50.74.0.0/16                  50.74.0.0/15
    50.75.192.0/18                50.74.0.0/15
    66.65.0.0/17                  66.65.0.0/16
    66.65.128.0/18                66.65.0.0/16
    66.110.97.0/24                66.110.96.0/19
    67.243.0.0/16                 67.240.0.0/12
    67.244.0.0/19                 67.240.0.0/12
    67.244.64.0/18                67.240.0.0/12
    67.245.0.0/16                 67.240.0.0/12
    67.247.0.0/18                 67.240.0.0/12
    67.247.96.0/19                67.240.0.0/12
    67.250.0.0/16                 67.240.0.0/12
    67.251.128.0/19               67.240.0.0/12
    67.251.192.0/18               67.240.0.0/12
    67.254.0.0/16                 67.240.0.0/12
    68.172.208.0/20               68.172.0.0/14
    68.172.224.0/19               68.172.0.0/14
    68.173.0.0/16                 68.172.0.0/14
    68.174.0.0/16                 68.172.0.0/14
    68.175.0.0/17                 68.172.0.0/14
    69.193.128.0/18               69.193.0.0/16
    69.193.192.0/19               69.193.0.0/16
    69.193.224.0/19               69.193.0.0/16
    69.200.64.0/19                69.200.0.0/13
    69.200.224.0/19               69.200.0.0/13
    69.200.240.0/21               69.200.0.0/13
    69.201.128.0/17               69.200.0.0/13
    69.202.128.0/17               69.200.0.0/13
    69.203.0.0/17                 69.200.0.0/13
    69.203.128.0/19               69.200.0.0/13
    69.203.192.0/18               69.200.0.0/13
    69.204.224.0/19               69.200.0.0/13
    69.206.0.0/16                 69.200.0.0/13
    72.43.96.0/19                 72.43.0.0/16
    72.43.128.0/18                72.43.0.0/16
    72.225.64.0/18                72.224.0.0/13
    72.225.128.0/17               72.224.0.0/13
    72.226.0.0/17                 72.224.0.0/13
    72.227.128.0/17               72.224.0.0/13
    72.229.0.0/16                 72.224.0.0/13
    72.231.0.0/17                 72.224.0.0/13
    74.64.0.0/16                  74.64.0.0/12
    74.65.192.0/18                74.64.0.0/12
    74.66.0.0/16                  74.64.0.0/12
    74.68.0.0/16                  74.64.0.0/12
    74.71.0.0/16                  74.64.0.0/12
    74.72.0.0/15                  74.64.0.0/12
    76.58.52.0/23                 76.32.0.0/11
    98.0.128.0/17                 98.0.0.0/12
    98.7.0.0/17                   98.0.0.0/12
    98.7.192.0/18                 98.0.0.0/12
    98.12.0.0/16                  98.0.0.0/12
    98.13.128.0/17                98.0.0.0/12
    98.14.0.0/15                  98.0.0.0/12
    108.176.0.0/18                108.176.0.0/16
    108.176.128.0/18              108.176.0.0/16
    142.105.0.0/17                142.105.0.0/16
    150.221.96.0/19               150.221.0.0/16
    150.224.177.0/24              150.224.0.0/16
    168.148.128.0/19              168.148.0.0/16
    184.74.128.0/17               184.74.0.0/16
    184.152.0.0/16                184.152.0.0/15
    184.153.0.0/17                184.152.0.0/15
    192.61.128.0/19               192.60.0.0/14
    198.151.200.0/24              198.151.200.0/22
    198.151.201.0/24              198.151.200.0/22
    198.151.202.0/24              198.151.200.0/22
    198.151.203.0/24              198.151.200.0/22
    198.179.64.0/19               198.179.64.0/18
    204.210.128.0/19              204.210.0.0/16
    207.251.238.0/23              207.251.224.0/20
    208.105.0.0/18                208.105.0.0/16
    208.105.64.0/19               208.105.0.0/16
    208.125.0.0/19                208.125.0.0/16

Whois Entry

whois: 402332

IANA has recorded AS12271 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS12271\n             
             #
             # 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:       12271
             ASName:         TWC-12271-NYC
             ASHandle:       AS12271
             RegDate:        2000-06-09
             Updated:        2018-11-27
             Ref:            https://rdap.arin.net/registry/autnum/12271
             
             
             
             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.
             #