Report for 20057

Name

ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC, 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 AS4637) 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.

20057 AT&T Wireless Service

  Adjacency:     3  Upstream:     2  Downstream:     1
  Upstream Adjacent AS list
    AS3356    LEVEL3 Level 3 Communications
    AS7018    ATT-INTERNET4 - AT&T WorldNet Services
  Downstream Adjacent AS list
    AS16572   CELLULARONE-INTERNET - CellularOne-Chicago

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
91    AS20057  ORG+TRN Originate:    3462144 /10.28  Transit:     409856 /13.36 AT&T Wireless Service

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       %
  420 AS20057 AT&T Wireless Service                        48     37      5     16     32  66.67%


  Prefix               AS Path                              Aggregation Suggestion
  155.170.0.0/16       4637 3356 20057        
  155.170.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 155.170.0.0/16 4637 3356 20057
  155.170.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 155.170.0.0/16 4637 3356 20057
  166.128.0.0/15       4637 3356 20057      + Announce - aggregate of 166.128.0.0/16 (4637 3356 20057) and 166.129.0.0/16 (4637 3356 20057)
  166.128.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.129.0.0/16 (4637 3356 20057)
  166.129.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.128.0.0/16 (4637 3356 20057)
  166.132.0.0/14       4637 3356 20057        
  166.132.0.0/15       4637 3356 20057      - Withdrawn - matching aggregate 166.132.0.0/14 4637 3356 20057
  166.137.0.0/16       4637 3356 20057        
  166.137.0.0/17       4637 3491 3561 7018 20057   
  166.137.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 166.137.0.0/16 4637 3356 20057
  166.184.0.0/15       4637 3356 20057      + Announce - aggregate of 166.184.0.0/16 (4637 3356 20057) and 166.185.0.0/16 (4637 3356 20057)
  166.184.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.185.0.0/16 (4637 3356 20057)
  166.184.0.0/17       4637 3491 3561 7018 20057   
  166.184.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 166.184.0.0/16 4637 3356 20057
  166.185.0.0/17       4637 3356 20057      - Withdrawn - aggregated with 166.185.128.0/17 (4637 3356 20057)
  166.185.128.0/17     4637 3356 20057      - Withdrawn - aggregated with 166.185.0.0/17 (4637 3356 20057)
  166.185.128.0/18     4637 3356 20057      - Withdrawn - matching aggregate 166.185.128.0/17 4637 3356 20057
  166.188.0.0/14       4637 3356 20057        
  166.188.0.0/15       4637 3356 20057      - Withdrawn - matching aggregate 166.188.0.0/14 4637 3356 20057
  166.192.0.0/13       4637 3356 20057        
  166.192.0.0/14       4637 3356 20057      - Withdrawn - matching aggregate 166.192.0.0/13 4637 3356 20057
  166.192.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.192.0.0/13 4637 3356 20057
  166.193.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.192.0.0/13 4637 3356 20057
  166.194.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.192.0.0/13 4637 3356 20057
  166.195.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.192.0.0/13 4637 3356 20057
  166.196.0.0/14       4637 3356 20057      - Withdrawn - matching aggregate 166.192.0.0/13 4637 3356 20057
  166.205.0.0/16       4637 3356 20057        
  166.205.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.205.0.0/16 4637 3356 20057
  166.205.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 166.205.0.0/16 4637 3356 20057
  166.213.0.0/16       4637 3356 20057        
  166.214.0.0/15       4637 3356 20057      + Announce - aggregate of 166.214.0.0/16 (4637 3356 20057) and 166.215.0.0/16 (4637 3356 20057)
  166.214.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.215.0.0/16 (4637 3356 20057)
  166.215.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.214.0.0/16 (4637 3356 20057)
  166.215.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.215.0.0/16 4637 3356 20057
  166.215.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 166.215.0.0/16 4637 3356 20057
  166.216.0.0/14       4637 3356 20057      + Announce - aggregate of 166.216.0.0/15 (4637 3356 20057) and 166.218.0.0/15 (4637 3356 20057)
  166.216.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.217.0.0/16 (4637 3356 20057)
  166.216.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.216.0.0/16 4637 3356 20057
  166.217.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.216.0.0/16 (4637 3356 20057)
  166.218.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.219.0.0/16 (4637 3356 20057)
  166.218.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.218.0.0/16 4637 3356 20057
  166.218.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 166.218.0.0/16 4637 3356 20057
  166.219.0.0/16       4637 3356 20057      - Withdrawn - aggregated with 166.218.0.0/16 (4637 3356 20057)
  166.220.0.0/16       4637 3356 20057        
  166.220.0.0/17       4637 3356 20057      - Withdrawn - matching aggregate 166.220.0.0/16 4637 3356 20057
  166.220.128.0/17     4637 3356 20057      - Withdrawn - matching aggregate 166.220.0.0/16 4637 3356 20057
  209.183.32.0/22      4637 3356 20057      + Announce - aggregate of 209.183.32.0/23 (4637 3356 20057) and 209.183.34.0/23 (4637 3356 20057)
  209.183.32.0/23      4637 3356 20057      - Withdrawn - aggregated with 209.183.34.0/23 (4637 3356 20057)
  209.183.34.0/23      4637 3356 20057      - Withdrawn - aggregated with 209.183.32.0/23 (4637 3356 20057)
  209.183.48.0/21      4637 3356 20057        
  209.183.48.0/22      4637 3356 20057      - Withdrawn - matching aggregate 209.183.48.0/21 4637 3356 20057
  209.183.52.0/22      4637 3356 20057      - Withdrawn - matching aggregate 209.183.48.0/21 4637 3356 20057

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

AS20057   61 More Specifics   62 Total Advertisements   AT&T Wireless Service
    32.128.0.0/12                 32.0.0.0/8
    32.128.0.0/13                 32.0.0.0/8
    32.136.0.0/13                 32.0.0.0/8
    32.144.0.0/12                 32.0.0.0/8
    32.144.0.0/13                 32.0.0.0/8
    32.160.0.0/13                 32.0.0.0/8
    32.160.0.0/14                 32.0.0.0/8
    32.164.0.0/14                 32.0.0.0/8
    32.168.0.0/13                 32.0.0.0/8
    32.168.0.0/14                 32.0.0.0/8
    155.170.0.0/17                155.170.0.0/16
    155.170.128.0/17              155.170.0.0/16
    166.128.0.0/16                166.128.0.0/9
    166.129.0.0/16                166.128.0.0/9
    166.130.0.0/16                166.128.0.0/9
    166.131.0.0/16                166.128.0.0/9
    166.132.0.0/14                166.128.0.0/9
    166.132.0.0/15                166.128.0.0/9
    166.137.0.0/16                166.128.0.0/9
    166.137.0.0/17                166.128.0.0/9
    166.137.128.0/17              166.128.0.0/9
    166.184.0.0/16                166.128.0.0/9
    166.184.0.0/17                166.128.0.0/9
    166.184.128.0/17              166.128.0.0/9
    166.185.0.0/17                166.128.0.0/9
    166.185.128.0/17              166.128.0.0/9
    166.186.0.0/16                166.128.0.0/9
    166.188.0.0/14                166.128.0.0/9
    166.188.0.0/15                166.128.0.0/9
    166.192.0.0/13                166.128.0.0/9
    166.192.0.0/14                166.128.0.0/9
    166.192.0.0/17                166.128.0.0/9
    166.193.0.0/17                166.128.0.0/9
    166.194.0.0/17                166.128.0.0/9
    166.195.0.0/17                166.128.0.0/9
    166.196.0.0/14                166.128.0.0/9
    166.200.0.0/16                166.128.0.0/9
    166.201.0.0/16                166.128.0.0/9
    166.205.0.0/16                166.128.0.0/9
    166.205.0.0/17                166.128.0.0/9
    166.205.128.0/17              166.128.0.0/9
    166.213.0.0/16                166.128.0.0/9
    166.214.0.0/16                166.128.0.0/9
    166.215.0.0/16                166.128.0.0/9
    166.215.0.0/17                166.128.0.0/9
    166.215.128.0/17              166.128.0.0/9
    166.216.0.0/16                166.128.0.0/9
    166.216.0.0/17                166.128.0.0/9
    166.217.0.0/16                166.128.0.0/9
    166.218.0.0/16                166.128.0.0/9
    166.218.0.0/17                166.128.0.0/9
    166.218.128.0/17              166.128.0.0/9
    166.219.0.0/16                166.128.0.0/9
    166.220.0.0/16                166.128.0.0/9
    166.220.0.0/17                166.128.0.0/9
    166.220.128.0/17              166.128.0.0/9
    209.183.32.0/23               209.183.32.0/19
    209.183.34.0/23               209.183.32.0/19
    209.183.48.0/21               209.183.32.0/19
    209.183.48.0/22               209.183.32.0/19
    209.183.52.0/22               209.183.32.0/19

Bogus ASes Announced by this AS

Bogus AS		Announcing-AS
AS64011	Announced by	AS20057	ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC, US

Whois Entry

whois: 402603

IANA has recorded AS20057 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS20057\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:       20057
             ASName:         ATT-MOBILITY-LLC-AS20057
             ASHandle:       AS20057
             RegDate:        2001-03-20
             Updated:        2025-03-18
             Ref:            https://rdap.arin.net/registry/autnum/20057
             
             
             
             OrgName:        AT&T Enterprises, LLC
             OrgId:          AEL-360
             Address:        208 S. Akard St.
             City:           Dallas
             StateProv:      TX
             PostalCode:     75202
             Country:        US
             RegDate:        2024-11-22
             Updated:        2026-06-05
             Ref:            https://rdap.arin.net/registry/entity/AEL-360
             
             
             OrgAbuseHandle: ABUSE7-ARIN
             OrgAbuseName:   abuse
             OrgAbusePhone:  +1-919-319-8167 
             OrgAbuseEmail:  abuse@att.net
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE7-ARIN
             
             OrgRoutingHandle: ROUTI59-ARIN
             OrgRoutingName:   Routing POC
             OrgRoutingPhone:  +1-999-999-9999 
             OrgRoutingEmail:  routing_poc@att.com
             OrgRoutingRef:    https://rdap.arin.net/registry/entity/ROUTI59-ARIN
             
             OrgTechHandle: ICC-ARIN
             OrgTechName:   IP Team
             OrgTechPhone:  +1-888-876-2382 
             OrgTechEmail:  rm-ipspecialist@att.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/ICC-ARIN
             
             OrgTechHandle: ZS44-ARIN
             OrgTechName:   IPAdmin-ATT Internet Services
             OrgTechPhone:  +1-888-510-5545 
             OrgTechEmail:  ipadmin@att.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/ZS44-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.
             #