ASN Lookup Tool

United States Department of Defense DoD mail.mil US US 18 Routes

AS Data

AS138

AS138 – United States Department of Defense DoD

AS Number 138
AS Name DNIC-AS-00138
Organization United States Department of Defense DoD(usddd)
Country US
Website mail.mil
Number of IPv4 Routes 18
Number of IPv6 Routes 0
ASN type GOVERNMENT
Registry ARIN
Date Allocated 1987-11-11

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

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IP Ranges

Route # IPs
144.183.227.0/24 256
144.183.127.0/24 256
141.234.64.0/18 16384
144.183.216.0/24 256
144.183.130.0/24 256
144.183.16.0/24 256
141.234.0.0/18 16384
144.183.17.0/24 256
144.183.32.0/22 1024
144.183.200.0/21 2048

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:        2025-03-13
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: 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

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


#
# 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

Peers

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

Upstreams

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

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Frequently Asked Questions

ASN AS138 is an Autonomous System Number used to identify a network for BGP internet routing.
AS138 is listed under United States Department of Defense DoD.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
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.