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 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.

11951 MCSP - Medical Computer Systems, US

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS174           COGENT-174 - Cogent Communications, LLC, US
    AS33657         CMCS - Comcast Cable Communications, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
4852  AS11951        ORIGIN  Originate:      38912 /16.75  Transit:          0 /0.00  MCSP - Medical Computer Systems, 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       %
20913 AS11951       MCSP - Medical Computer Systems, US               11      2      1     10      1   9.09%


  Prefix               AS Path                              Aggregation Suggestion
  66.186.128.0/20      4777 2497 174 11951    
  66.186.129.0/24      4777 2516 7922 33657 11951 11951 11951 11951 11951 11951   
  204.152.42.0/23      4777 2516 7922 33657 11951 11951 11951 11951 11951 11951   
  204.152.42.0/23      4777 2516 174 11951  + Announce - aggregate of 204.152.42.0/24 (4777 2516 174 11951) and 204.152.43.0/24 (4777 2516 174 11951)
  204.152.42.0/24      4777 2516 174 11951  - Withdrawn - aggregated with 204.152.43.0/24 (4777 2516 174 11951)
  204.152.43.0/24      4777 2516 174 11951  - Withdrawn - aggregated with 204.152.42.0/24 (4777 2516 174 11951)
  205.147.160.0/19     4777 2497 174 11951    
  207.152.128.0/18     4777 2497 174 11951    
  207.152.134.0/24     4777 2516 174 11951    
  207.152.135.0/24     4777 2516 7922 33657 11951 11951 11951 11951 11951 11951   
  209.50.192.0/19      4777 2497 174 11951    
  209.50.193.0/24      4777 2516 174 11951    

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

AS11951   6 More Specifics   11 Total Advertisements   MCSP - Medical Computer Systems, US
    66.186.129.0/24               66.186.128.0/20
    204.152.42.0/24               204.152.42.0/23
    204.152.43.0/24               204.152.42.0/23
    207.152.134.0/24              207.152.128.0/18
    207.152.135.0/24              207.152.128.0/18
    209.50.193.0/24               209.50.192.0/19

Whois Entry

whois: 402603

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:  +1-949-365-1249 
             OrgTechEmail:  pdw@mcsp.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             OrgAbuseHandle: PW25-ARIN
             OrgAbuseName:   Wolotsky, Paul 
             OrgAbusePhone:  +1-949-365-1249 
             OrgAbuseEmail:  pdw@mcsp.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             RTechHandle: PW25-ARIN
             RTechName:   Wolotsky, Paul 
             RTechPhone:  +1-949-365-1249 
             RTechEmail:  pdw@mcsp.com
             RTechRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             RAbuseHandle: PW25-ARIN
             RAbuseName:   Wolotsky, Paul 
             RAbusePhone:  +1-949-365-1249 
             RAbuseEmail:  pdw@mcsp.com
             RAbuseRef:    https://rdap.arin.net/registry/entity/PW25-ARIN
             
             RNOCHandle: PW25-ARIN
             RNOCName:   Wolotsky, Paul 
             RNOCPhone:  +1-949-365-1249 
             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.
             #