ASN AS54439 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS54439?

AS54439 is listed under Montgomery County Government, Maryland.

What do peers, upstreams, and downstreams mean in ASN data?

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 shown for an ASN?

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

How can I access the full ASN tables?

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AS54439 Montgomery County Government, Maryland

Montgomery County Government, Maryland montgomerycountymd.gov

US 24 Routes

AS Data

AS54439

AS54439 – Montgomery County Government, Maryland

AS Number	54439
AS Name	MCGM-FIBERNET3
Organization	Montgomery County Government, Maryland (mcgm)
Country	US
Website	montgomerycountymd.gov
Number of IPv4 Routes	24
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2020-12-31

ASN Intelligence API for production workflows

Use ASN data for AS54439 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

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:       54439
ASName:         MCGM-FIBERNET3
ASHandle:       AS54439
RegDate:        2020-12-31
Updated:        2021-03-08
Ref:            https://rdap.arin.net/registry/autnum/54439


OrgName:        Montgomery County Government, Maryland
OrgId:          MCGM
Address:        100 Maryland Ave.
Address:        Suite 300
City:           Rockville
StateProv:      MD
PostalCode:     20850
Country:        US
RegDate:        2006-10-12
Updated:        2025-10-07
Ref:            https://rdap.arin.net/registry/entity/MCGM


OrgAbuseHandle: RGS11-ARIN
OrgAbuseName:   Shields, Robert Gene
OrgAbusePhone:  +1-703-283-3884 
OrgAbuseEmail:  rob@shieldnet.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/RGS11-ARIN

OrgDNSHandle: RGS11-ARIN
OrgDNSName:   Shields, Robert Gene
OrgDNSPhone:  +1-703-283-3884 
OrgDNSEmail:  rob@shieldnet.net
OrgDNSRef:    https://rdap.arin.net/registry/entity/RGS11-ARIN

OrgNOCHandle: MDG40-ARIN
OrgNOCName:   Gardner, Mark Daniel
OrgNOCPhone:  +1-240-773-8116 
OrgNOCEmail:  mark.gardner@montgomerycountymd.gov
OrgNOCRef:    https://rdap.arin.net/registry/entity/MDG40-ARIN

OrgTechHandle: RGS11-ARIN
OrgTechName:   Shields, Robert Gene
OrgTechPhone:  +1-703-283-3884 
OrgTechEmail:  rob@shieldnet.net
OrgTechRef:    https://rdap.arin.net/registry/entity/RGS11-ARIN

OrgRoutingHandle: RGS11-ARIN
OrgRoutingName:   Shields, Robert Gene
OrgRoutingPhone:  +1-703-283-3884 
OrgRoutingEmail:  rob@shieldnet.net
OrgRoutingRef:    https://rdap.arin.net/registry/entity/RGS11-ARIN

OrgAbuseHandle: WEBST183-ARIN
OrgAbuseName:   Webster, Joe 
OrgAbusePhone:  +1-240-773-8133 
OrgAbuseEmail:  joseph.webster@montgomerycountymd.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/WEBST183-ARIN

OrgDNSHandle: MDG40-ARIN
OrgDNSName:   Gardner, Mark Daniel
OrgDNSPhone:  +1-240-773-8116 
OrgDNSEmail:  mark.gardner@montgomerycountymd.gov
OrgDNSRef:    https://rdap.arin.net/registry/entity/MDG40-ARIN

OrgTechHandle: RMN9-ARIN
OrgTechName:   Nussey, Roderick MacIntyre
OrgTechPhone:  +1-240-777-2110 
OrgTechEmail:  rod.nussey@montgomerycountymd.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/RMN9-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" : "54439",
    "as_handle" : "AS54439",
    "as_name" : "MCGM-FIBERNET3",
    "admin_contacts" : [ "RGS11-ARIN", "MDG40-ARIN" ],
    "tech_contacts" : [ "RGS11-ARIN", "RGS11-ARIN", "RMN9-ARIN" ],
    "abuse_contacts" : [ "RGS11-ARIN", "WEBST183-ARIN" ],
    "date_created" : "2020-12-31",
    "date_updated" : "2021-03-08",
    "source" : "https://rdap.arin.net/registry/autnum/54439"
  } ],
  "organization" : {
    "handle" : "MCGM",
    "name" : "Montgomery County Government, Maryland",
    "address" : [ "100 Maryland Ave.", "Suite 300", "Rockville", "MD", "20850", "US" ],
    "street" : "Maryland Ave.",
    "city" : "Rockville",
    "state" : "MD",
    "zip_code" : "20850",
    "country" : [ "US" ],
    "date_created" : "2006-10-12",
    "date_updated" : "2025-10-07",
    "source" : "https://rdap.arin.net/registry/entity/MCGM",
    "addressCountry" : "US"
  },
  "administrative_contacts" : [ {
    "handle" : "RGS11-ARIN",
    "name" : "Shields, Robert Gene",
    "email" : [ "rob@shieldnet.net" ],
    "phone" : [ "+1-703-283-3884" ],
    "source" : "https://rdap.arin.net/registry/entity/RGS11-ARIN"
  }, {
    "handle" : "MDG40-ARIN",
    "name" : "Gardner, Mark Daniel",
    "email" : [ "mark.gardner@montgomerycountymd.gov" ],
    "phone" : [ "+1-240-773-8116" ],
    "source" : "https://rdap.arin.net/registry/entity/MDG40-ARIN"
  } ],
  "technical_contacts" : [ {
    "handle" : "RGS11-ARIN",
    "name" : "Shields, Robert Gene",
    "email" : [ "rob@shieldnet.net" ],
    "phone" : [ "+1-703-283-3884" ],
    "source" : "https://rdap.arin.net/registry/entity/RGS11-ARIN"
  }, {
    "handle" : "RMN9-ARIN",
    "name" : "Nussey, Roderick MacIntyre",
    "email" : [ "rod.nussey@montgomerycountymd.gov" ],
    "phone" : [ "+1-240-777-2110" ],
    "source" : "https://rdap.arin.net/registry/entity/RMN9-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "RGS11-ARIN",
    "name" : "Shields, Robert Gene",
    "email" : [ "rob@shieldnet.net" ],
    "phone" : [ "+1-703-283-3884" ],
    "source" : "https://rdap.arin.net/registry/entity/RGS11-ARIN"
  }, {
    "handle" : "WEBST183-ARIN",
    "name" : "Webster, Joe",
    "email" : [ "joseph.webster@montgomerycountymd.gov" ],
    "phone" : [ "+1-240-773-8133" ],
    "source" : "https://rdap.arin.net/registry/entity/WEBST183-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS40468	Montgomery County Government, Maryland	US

Upstreams

AS Number	Description	Country
AS40468	Montgomery County Government, Maryland	US

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