ASN AS56 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS56?

AS56 is listed under United States Department of Defense DoD.

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.

AS56 United States Department of Defense DoD

ASN Lookup Tool

United States Department of Defense DoD mail.mil

US 932 Routes

AS Data

AS56

AS56 – United States Department of Defense DoD

AS Number	56
AS Name	DNIC-AS-00056
Organization	United States Department of Defense DoD(usddd)
Country	US
Website	mail.mil
Number of IPv4 Routes	932
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	1985-12-18

ASN Intelligence API for production workflows

Use ASN data for AS56 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
129.54.208.0/21	AS56	United States Department of Defense DoD	Air Force Systems Networking	2048
132.2.0.0/19	AS56	United States Department of Defense DoD	Air Force Systems Networking	8192
137.14.208.0/21	AS56	United States Department of Defense DoD	Air Force Systems Networking	2048
137.14.187.0/24	AS56	United States Department of Defense DoD	Air Force Systems Networking	256
207.133.173.0/24	AS56	United States Department of Defense DoD	DoD Network Information Center	256
131.43.57.0/24	AS56	United States Department of Defense DoD	Air Force Systems Networking	256
132.2.128.0/20	AS56	United States Department of Defense DoD	Air Force Systems Networking	4096
137.14.127.0/24	AS56	United States Department of Defense DoD	Air Force Systems Networking	256
132.28.255.0/24	AS56	United States Department of Defense DoD	Air Force Systems Networking	256
132.13.138.0/24	AS56	United States Department of Defense DoD	Air Force Systems Networking	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:       56
ASName:         DNIC-AS-00056
ASHandle:       AS56
RegDate:        1985-12-18
Updated:        2025-09-12    
Ref:            https://rdap.arin.net/registry/autnum/56



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


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

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

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


#
# 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
AS27065	United States Department of Defense DoD	US
AS27064	United States Department of Defense DoD	US
AS27065	United States Department of Defense (DoD)	US

Upstreams

AS Number	Description	Country
AS27065	United States Department of Defense DoD	US
AS27064	United States Department of Defense DoD	US