ASN AS138 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS138?

AS138 is listed under United States Department of Defense.

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?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS138 United States Department of Defense

ASN Lookup Tool

United States Department of Defense defense.gov

US 25 Routes

AS Data

AS138

AS138 – United States Department of Defense

AS Number	138
AS Name	DNIC-AS-00138
Organization	United States Department of Defense (usddd)
Country	US
Website	defense.gov
Number of IPv4 Routes	25
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	1987-11-11

ASN Intelligence API for production workflows

Use ASN data for AS138 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
144.183.16.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.127.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
131.66.249.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.130.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.216.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
131.66.252.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
141.234.0.0/18	AS138	United States Department of Defense	DoD Network Information Center	16384
144.183.17.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
131.66.48.0/22	AS138	United States Department of Defense	DoD Network Information Center	1024
144.183.32.0/22	AS138	United States Department of Defense	DoD Network Information Center	1024
131.66.251.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
131.66.44.0/22	AS138	United States Department of Defense	DoD Network Information Center	1024
131.66.246.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
131.66.0.0/16	AS138	United States Department of Defense	DoD Network Information Center	65536
141.234.64.0/18	AS138	United States Department of Defense	DoD Network Information Center	16384
131.67.0.0/16	AS138	United States Department of Defense	DoD Network Information Center	65536
131.68.0.0/16	AS138	United States Department of Defense	DoD Network Information Center	65536
144.183.227.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.196.0/22	AS138	United States Department of Defense	DoD Network Information Center	1024
131.66.250.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.200.0/21	AS138	United States Department of Defense	DoD Network Information Center	2048
144.183.128.0/23	AS138	United States Department of Defense	DoD Network Information Center	512
144.183.15.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.20.0/24	AS138	United States Department of Defense	DoD Network Information Center	256
144.183.131.0/24	AS138	United States Department of Defense	DoD Network Information 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:       138
ASName:         DNIC-AS-00138
ASHandle:       AS138
RegDate:        1987-11-11
Updated:        2025-09-12
Ref:            https://rdap.arin.net/registry/autnum/138



OrgName:        United States Department of Defense (DoD)
OrgId:          USDDD
Address:        3990 E. Broad Street
City:           Columbus
StateProv:      OH
PostalCode:     43218
Country:        US
RegDate:        2007-01-12
Updated:        2026-08-12
Ref:            https://rdap.arin.net/registry/entity/USDDD


OrgNOCHandle: MIL-HSTMST-ARIN
OrgNOCName:   Network DoD
OrgNOCPhone:  +1-844-347-2457 
OrgNOCEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgNOCRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgTechHandle: MIL-HSTMST-ARIN
OrgTechName:   Network DoD
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN

OrgTechHandle: REGIS10-ARIN
OrgTechName:   Registration
OrgTechPhone:  +1-844-347-2457 
OrgTechEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
OrgTechRef:    https://rdap.arin.net/registry/entity/REGIS10-ARIN

OrgAbuseHandle: MIL-HSTMST-ARIN
OrgAbuseName:   Network DoD
OrgAbusePhone:  +1-844-347-2457 
OrgAbuseEmail:  disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MIL-HSTMST-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" : "138",
    "as_handle" : "AS138",
    "as_name" : "DNIC-AS-00138",
    "tech_contacts" : [ "MIL-HSTMST-ARIN", "REGIS10-ARIN" ],
    "abuse_contacts" : [ "MIL-HSTMST-ARIN" ],
    "date_created" : "1987-11-11",
    "date_updated" : "2025-09-12",
    "source" : "https://rdap.arin.net/registry/autnum/138"
  } ],
  "organization" : {
    "handle" : "USDDD",
    "name" : "United States Department of Defense (DoD)",
    "address" : [ "3990 E. Broad Street", "Columbus", "OH", "43218", "US" ],
    "street" : "E. Broad Street",
    "city" : "Columbus",
    "state" : "OH",
    "zip_code" : "43218",
    "country" : [ "US" ],
    "date_created" : "2007-01-12",
    "date_updated" : "2026-08-12",
    "source" : "https://rdap.arin.net/registry/entity/USDDD",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "MIL-HSTMST-ARIN",
    "name" : "Network DoD",
    "email" : [ "disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil" ],
    "phone" : [ "+1-844-347-2457" ],
    "source" : "https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN"
  }, {
    "handle" : "REGIS10-ARIN",
    "name" : "Registration",
    "email" : [ "disa.columbus.ns.mbx.arin-registrations@mail.mil" ],
    "phone" : [ "+1-844-347-2457" ],
    "source" : "https://rdap.arin.net/registry/entity/REGIS10-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "MIL-HSTMST-ARIN",
    "name" : "Network DoD",
    "email" : [ "disa.columbus.ns.mbx.hostmaster-dod-nic@mail.mil" ],
    "phone" : [ "+1-844-347-2457" ],
    "source" : "https://rdap.arin.net/registry/entity/MIL-HSTMST-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS27064	United States Department of Defense DoD	US

Upstreams

AS Number	Description	Country
AS27064	United States Department of Defense DoD	US