Report for 21821

Name

MMAHS-01 - Montefiore Medical Center, 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.

21821 MMAHS-01 - Montefiore Medical Center, US

  Adjacency:     1  Upstream:     1  Downstream:     0
  Upstream Adjacent AS list
    AS32787         PROLEXIC-TECHNOLOGIES-DDOS-MITIGATION-NETWORK - Akamai Technologies, Inc., US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
35138 AS21821        ORIGIN  Originate:       1024 /22.00  Transit:          0 /0.00  MMAHS-01 - Montefiore Medical Center, 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       %
21081 AS21821       MMAHS-01 - Montefiore Medical Center, US           4      2      1      3      1  25.00%


  Prefix               AS Path                              Aggregation Suggestion
  144.121.102.0/24     4777 32787 21821       
  144.121.104.0/24     4777 32787 21821       
  216.255.100.0/23     4777 32787 21821     + Announce - aggregate of 216.255.100.0/24 (4777 32787 21821) and 216.255.101.0/24 (4777 32787 21821)
  216.255.100.0/24     4777 32787 21821     - Withdrawn - aggregated with 216.255.101.0/24 (4777 32787 21821)
  216.255.101.0/24     4777 32787 21821     - Withdrawn - aggregated with 216.255.100.0/24 (4777 32787 21821)

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

AS21821   4 More Specifics   4 Total Advertisements   MMAHS-01 - Montefiore Medical Center, US
    144.121.102.0/24              144.121.0.0/16
    144.121.104.0/24              144.121.0.0/16
    216.255.100.0/24              216.255.96.0/19
    216.255.101.0/24              216.255.96.0/19

Whois Entry

whois: 402332

IANA has recorded AS21821 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS21821\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:       21821
             ASName:         MMAHS-01
             ASHandle:       AS21821
             RegDate:        2017-04-03
             Updated:        2017-04-03
             Ref:            https://rdap.arin.net/registry/autnum/21821
             
             
             OrgName:        Montefiore Medical Center
             OrgId:          MMC-125
             Address:        1 Fordham Plaza
             City:           Bronx
             StateProv:      NY
             PostalCode:     10458
             Country:        US
             RegDate:        2001-06-26
             Updated:        2021-04-02
             Ref:            https://rdap.arin.net/registry/entity/MMC-125
             
             
             OrgTechHandle: NCC46-ARIN
             OrgTechName:   NCC
             OrgTechPhone:  +1-914-457-6700 
             OrgTechEmail:  ncc@montefiore.org
             OrgTechRef:    https://rdap.arin.net/registry/entity/NCC46-ARIN
             
             OrgAbuseHandle: NCC46-ARIN
             OrgAbuseName:   NCC
             OrgAbusePhone:  +1-914-457-6700 
             OrgAbuseEmail:  ncc@montefiore.org
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/NCC46-ARIN
             
             OrgNOCHandle: NCC46-ARIN
             OrgNOCName:   NCC
             OrgNOCPhone:  +1-914-457-6700 
             OrgNOCEmail:  ncc@montefiore.org
             OrgNOCRef:    https://rdap.arin.net/registry/entity/NCC46-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.
             #