ASN Lookup Tool

United States Department of Defense DoD mail.mil US US 941 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 941
Number of IPv6 Routes 0
ASN type GOVERNMENT
Registry ARIN
Date Allocated 1985-12-18

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IP Ranges

Route # IPs
129.54.208.0/21 2048
132.2.0.0/19 8192
137.14.208.0/21 2048
137.14.187.0/24 256
207.133.173.0/24 256
131.43.57.0/24 256
132.2.128.0/20 4096
137.14.127.0/24 256
132.28.255.0/24 256
132.13.138.0/24 256
131.56.0.0/16 65536
131.15.116.0/23 512
137.14.222.0/24 256
143.147.160.0/19 8192
137.2.128.0/18 16384
131.43.200.0/22 1024
137.14.63.0/24 256
207.133.168.0/24 256
131.43.48.0/21 2048
137.14.92.0/23 512
132.50.76.0/24 256
132.57.48.0/20 4096
132.50.168.0/24 256
131.60.124.0/23 512
132.50.142.0/23 512
132.17.80.0/20 4096
207.133.167.0/24 256
137.2.0.0/20 4096
132.17.240.0/20 4096
131.62.11.0/24 256
137.14.221.0/24 256
131.62.9.0/24 256
132.13.78.0/23 512
129.54.64.0/21 2048
207.133.174.0/24 256
129.61.0.0/16 65536
131.43.206.0/24 256
140.19.48.0/22 1024
131.61.211.0/24 256
131.43.248.0/22 1024
198.25.63.0/24 256
132.5.120.0/24 256
131.25.0.0/16 65536
132.39.32.0/20 4096
137.14.186.0/24 256
131.60.41.0/24 256
131.51.0.0/16 65536
132.50.174.0/24 256
143.142.160.0/20 4096
137.14.10.0/24 256
131.5.48.0/21 2048
131.43.56.0/24 256
131.60.42.0/24 256
131.43.62.0/24 256
137.14.223.0/24 256
132.50.172.0/24 256
131.18.104.0/24 256
131.9.0.0/16 65536
132.50.202.0/24 256
143.140.0.0/21 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:       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


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

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: 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


#
# 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

Legacy Routes

134.165.102.0/24

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Frequently Asked Questions

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