Report for 11951

Name

MCSP - Medical Computer Systems, 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 AS6447) 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.

11951 MCSP, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS174           COGENT-174, US
    AS33657         CMCS, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
4877  AS11951        ORIGIN  Originate:      38912 /16.75  Transit:          0 /0.00  MCSP, 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       %
12264 AS11951       MCSP, US                                          11      4      1      8      3  27.27%


  Prefix               AS Path                              Aggregation Suggestion
  66.186.128.0/20      49788 174 11951        
  66.186.129.0/24      7018 7922 33657 11951 11951 11951 11951 11951 11951   
  204.152.42.0/23      7018 7922 33657 11951 11951 11951 11951 11951 11951   
  204.152.42.0/23      49788 174 11951      + Announce - aggregate of 204.152.42.0/24 (49788 174 11951) and 204.152.43.0/24 (49788 174 11951)
  204.152.42.0/24      49788 174 11951      - Withdrawn - aggregated with 204.152.43.0/24 (49788 174 11951)
  204.152.43.0/24      49788 174 11951      - Withdrawn - aggregated with 204.152.42.0/24 (49788 174 11951)
  205.147.160.0/19     49788 174 11951        
  207.152.128.0/18     49788 174 11951        
  207.152.134.0/24     49788 174 11951      - Withdrawn - matching aggregate 207.152.128.0/18 49788 174 11951
  207.152.135.0/24     57866 3356 33657 11951 11951 11951 11951 11951 11951   
  209.50.192.0/19      49788 174 11951        
  209.50.193.0/24      49788 174 11951      - Withdrawn - matching aggregate 209.50.192.0/19 49788 174 11951

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

AS11951   1 More Specifics   6 Total Advertisements   MCSP, US
    66.186.128.0/24               66.186.128.0/20
    205.147.160.0/21              205.147.160.0/19
    205.147.168.0/21              205.147.160.0/19
    205.147.176.0/21              205.147.160.0/19
    205.147.187.0/24              205.147.160.0/19

Prefixes added and withdrawn by this origin AS in the past 7 days.

    - 205.147.160.0/21            Withdrawn
    - 205.147.168.0/21            Withdrawn
    - 205.147.176.0/21            Withdrawn
    - 205.147.187.0/24            Withdrawn

Whois Entry

whois: 402590

IANA has recorded AS11951 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS11951\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:       11951
             ASName:         MCSP
             ASHandle:       AS11951
             RegDate:        1999-02-12
             Updated:        2021-07-14
             Ref:            https://rdap.arin.net/registry/autnum/11951
             
             
             OrgName:        Medical Computer Systems
             OrgId:          MDCS
             Address:        1729 21st Street, NW
             City:           Washington
             StateProv:      DC
             PostalCode:     20009
             Country:        US
             RegDate:        1997-04-04
             Updated:        2011-09-24
             Ref:            https://rdap.arin.net/registry/entity/MDCS
             
             
             OrgTechHandle: PW25-ARIN
             OrgTechName:   Wolotsky, Paul 
             OrgTechPhone:  +1-866-814-9543 
             OrgTechEmail:  pdw@mcsp.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             OrgAbuseHandle: PW25-ARIN
             OrgAbuseName:   Wolotsky, Paul 
             OrgAbusePhone:  +1-866-814-9543 
             OrgAbuseEmail:  pdw@mcsp.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             RTechHandle: PW25-ARIN
             RTechName:   Wolotsky, Paul 
             RTechPhone:  +1-866-814-9543 
             RTechEmail:  pdw@mcsp.com
             RTechRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             RAbuseHandle: PW25-ARIN
             RAbuseName:   Wolotsky, Paul 
             RAbusePhone:  +1-866-814-9543 
             RAbuseEmail:  pdw@mcsp.com
             RAbuseRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             RNOCHandle: PW25-ARIN
             RNOCName:   Wolotsky, Paul 
             RNOCPhone:  +1-866-814-9543 
             RNOCEmail:  pdw@mcsp.com
             RNOCRef:    https://rdap.arin.net/registry/entity/PW25-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.
             #