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AS18937 National Monitoring Center

Q: Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

ASN Lookup Tool

National Monitoring Center nmccentral.com

US 2 Routes

AS Data

AS18937

AS18937 – National Monitoring Center

AS Number	18937
AS Name	NMC
Organization	National Monitoring Center (api-52)
Country	US
Website	nmccentral.com
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2007-04-17

ASN Intelligence API for production workflows

Use ASN data for AS18937 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
12.197.228.0/24	AS18937	National Monitoring Center	National Monitoring Center	256
67.129.151.0/24	AS18937	National Monitoring Center	National Monitoring Center	256

Raw Whois Response

#
# 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.
#

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "18937",
    "as_handle" : "AS18937",
    "as_name" : "NMC",
    "tech_contacts" : [ "SWS18-ARIN", "SWS18-ARIN" ],
    "abuse_contacts" : [ "SWS18-ARIN" ],
    "date_created" : "2007-04-17",
    "date_updated" : "2012-03-02",
    "source" : "https://rdap.arin.net/registry/autnum/18937"
  } ],
  "organization" : {
    "handle" : "API-52",
    "name" : "National Monitoring Center",
    "address" : [ "26800 Aliso Viejo Pkwy", "Ste. 250", "Aliso Viejo", "CA", "92656", "US" ],
    "street" : "Aliso Viejo Pkwy",
    "city" : "Aliso Viejo",
    "state" : "CA",
    "zip_code" : "92656",
    "country" : [ "US" ],
    "date_created" : "2007-02-09",
    "date_updated" : "2011-09-24",
    "source" : "https://rdap.arin.net/registry/entity/API-52",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "SWS18-ARIN",
    "name" : "SCHUBERT, SCOTT WILLIAM",
    "email" : [ "fkolsy@nmccentral.com" ],
    "phone" : [ "+1-949-215-8000" ],
    "source" : "https://rdap.arin.net/registry/entity/SWS18-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "SWS18-ARIN",
    "name" : "SCHUBERT, SCOTT WILLIAM",
    "email" : [ "fkolsy@nmccentral.com" ],
    "phone" : [ "+1-949-215-8000" ],
    "source" : "https://rdap.arin.net/registry/entity/SWS18-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3549	Level 3 Parent, LLC	US
AS3356	Level 3 Parent, LLC	US
AS11427	Charter Communications Inc	US

Upstreams

AS Number	Description	Country
AS7018	AT&T Enterprises, LLC	US
AS3356	Level 3 Parent, LLC	US
AS11427	Charter Communications Inc	US

Frequently Asked Questions

What is ASN AS18937?

ASN AS18937 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS18937?

AS18937 is listed under National Monitoring Center.

What do peers, upstreams, and downstreams mean?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data included here?

WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.