Report for 18937

Name

NMC - National Monitoring 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.

18937 NMC - National Monitoring Center, US

  Adjacency:     3  Upstream:     3  Downstream:     0
  Upstream Adjacent AS list
    AS11427         TWC-11427-TEXAS - Charter Communications Inc, US
    AS3356          LEVEL3 - Level 3 Parent, LLC, US
    AS7018          ATT-INTERNET4 - AT&T Enterprises, LLC, US

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
48460 AS18937        ORIGIN  Originate:        512 /23.00  Transit:          0 /0.00  NMC - National Monitoring 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       %
35355 AS18937       NMC - National Monitoring Center, US               2      0      0      2      0   0.00%


  Prefix               AS Path                              Aggregation Suggestion
  12.197.228.0/24      4777 2497 7018 18937   
  67.129.151.0/24      4777 2497 3356 18937   

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

AS18937   2 More Specifics   2 Total Advertisements   NMC - National Monitoring Center, US
    12.197.228.0/24               12.0.0.0/8
    67.129.151.0/24               67.128.0.0/13

Whois Entry

whois: 402332

IANA has recorded AS18937 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS18937\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:       18937
             ASName:         NMC
             ASHandle:       AS18937
             RegDate:        2007-04-17
             Updated:        2012-03-02
             Ref:            https://rdap.arin.net/registry/autnum/18937
             
             
             OrgName:        National Monitoring Center
             OrgId:          API-52
             Address:        26800 Aliso Viejo Pkwy
             Address:        Ste. 250
             City:           Aliso Viejo
             StateProv:      CA
             PostalCode:     92656
             Country:        US
             RegDate:        2007-02-09
             Updated:        2011-09-24
             Ref:            https://rdap.arin.net/registry/entity/API-52
             
             
             OrgTechHandle: SWS18-ARIN
             OrgTechName:   SCHUBERT, SCOTT WILLIAM
             OrgTechPhone:  +1-949-215-8000 
             OrgTechEmail:  fkolsy@nmccentral.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/SWS18-ARIN
             
             OrgAbuseHandle: SWS18-ARIN
             OrgAbuseName:   SCHUBERT, SCOTT WILLIAM
             OrgAbusePhone:  +1-949-215-8000 
             OrgAbuseEmail:  fkolsy@nmccentral.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/SWS18-ARIN
             
             RTechHandle: SWS18-ARIN
             RTechName:   SCHUBERT, SCOTT WILLIAM
             RTechPhone:  +1-949-215-8000 
             RTechEmail:  fkolsy@nmccentral.com
             RTechRef:    https://rdap.arin.net/registry/entity/SWS18-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.
             #