Report for 4021

Name

ASN-4020-1 - Air Force Systems Networking, 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.

4021 TASDAC - TASDAC

  Adjacency:     3  Upstream:     3  Downstream:     0
  Upstream Adjacent AS list
    AS27064   DDN-ASNBLK1 - DoD Network Information Center
    AS6045    DDN-ASNBLK - DoD Network Information Center
    AS721     DISA-ASNBLK - DoD Network Information Center

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
13372 AS4021   ORIGIN  Originate:       1536 /21.42  Transit:          0 /0.00  TASDAC - TASDAC

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       %
 7118 AS4021  TASDAC - TASDAC                               6      0      0      6      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  198.218.2.0/24       4637 209 721 27064 27064 6045 4021   
  198.220.167.0/24     4637 209 721 27064 27064 4021   
  198.220.223.0/24     4637 209 721 4021      
  198.220.224.0/24     4637 209 721 4021      
  198.220.238.0/24     4637 209 721 27064 27064 6045 4021   
  199.9.70.0/24        4637 209 721 27064 27064 6045 4021   

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

AS4021   3 More Specifics   3 Total Advertisements   TASDAC - SSG/SIN
    198.220.141.0/24              198.220.0.0/16
    198.220.162.0/24              198.220.0.0/16
    199.9.70.0/24                 199.9.64.0/18
    198.220.169.0/24              198.220.0.0/16
    198.220.173.0/24              198.220.0.0/16
    198.220.179.0/24              198.220.0.0/16
    198.220.217.0/24              198.220.0.0/16

Prefixes added and withdrawn by this origin AS in the past 7 days.

    + 198.220.141.0/24            Announced
    + 198.220.162.0/24            Announced
    - 198.220.169.0/24            Withdrawn
    - 198.220.173.0/24            Withdrawn
    - 198.220.179.0/24            Withdrawn
    - 198.220.217.0/24            Withdrawn

Whois Entry

whois: 402609

IANA has recorded AS4021 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS4021\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:       4020 - 4038
             ASName:         ASN-4020-1
             ASHandle:       AS4020
             RegDate:        1994-11-17
             Updated:        2012-12-14
             Ref:            https://rdap.arin.net/registry/autnum/4020
             
             
             OrgName:        Air Force Systems Networking
             OrgId:          7ESG
             Address:        501 EAST MOORE DR. BLDG 884 RM 1100 GUNTHER ANNEX
             City:           MAXWELL AFB
             StateProv:      AL
             PostalCode:     36114
             Country:        US
             RegDate:        2008-06-05
             Updated:        2025-03-13
             Ref:            https://rdap.arin.net/registry/entity/7ESG
             
             
             OrgAbuseHandle: REGIS10-ARIN
             OrgAbuseName:   Registration
             OrgAbusePhone:  +1-844-347-2457 
             OrgAbuseEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/REGIS10-ARIN
             
             OrgTechHandle: REGIS10-ARIN
             OrgTechName:   Registration
             OrgTechPhone:  +1-844-347-2457 
             OrgTechEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
             OrgTechRef:    https://rdap.arin.net/registry/entity/REGIS10-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.
             #