ASN AS5277 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS5277?

AS5277 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?

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AS5277 United States Department of Defense

ASN Lookup Tool

United States Department of Defense war.gov

US 21 Routes

AS Data

AS5277

AS5277 – United States Department of Defense

AS Number	5277
AS Name	DNIC-ASBLK-05120-05376
Organization	United States Department of Defense (usddd)
Country	US
Website	war.gov
Number of IPv4 Routes	20
Number of IPv6 Routes	1
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	1995-05-09

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Use ASN data for AS5277 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
6.16.74.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
6.16.87.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
143.138.128.0/24	AS5277	United States Department of Defense	U.S. Army Information Systems Command	256
192.172.12.0/24	AS5277	United States Department of Defense	U.S. Army Information Systems Command	256
6.148.83.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
143.77.200.0/24	AS5277	United States Department of Defense	U.S. Army Information Systems Command	256
147.242.252.0/22	AS5277	United States Department of Defense	U.S. Army Information Systems Command	1024
6.16.201.0/24	AS0	Headquarters, USAISC	U.S. Army Information Systems Command	256
160.135.0.0/16	AS5277	United States Department of Defense	U.S. Army Information Systems Command	65536
215.1.18.0/24	AS5277	United States Department of Defense	DoD Network Information Center	256
143.77.0.0/16	AS5277	United States Department of Defense	U.S. Army Information Systems Command	65536
144.59.0.0/16	AS5277	United States Department of Defense	U.S. Army Information Systems Command	65536
6.148.82.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
6.16.75.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
2608:c109:c0::/48	AS5277	United States Department of Defense	United States Department of Defense DoD	~1×10²⁴
6.148.84.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
147.242.7.0/24	AS5277	United States Department of Defense	U.S. Army Information Systems Command	256
143.138.0.0/16	AS5277	United States Department of Defense	U.S. Army Information Systems Command	65536
147.242.100.0/22	AS5277	United States Department of Defense	U.S. Army Information Systems Command	1024
6.148.80.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	256
6.16.86.0/24	AS5277	United States Department of Defense DoD	U.S. Army Information Systems Command	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:       5120 - 5376
ASName:         DNIC-ASBLK-05120-05376
ASHandle:       AS5120
RegDate:        1995-05-09
Updated:        2026-09-25
Comment:        -----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
Ref:            https://rdap.arin.net/registry/autnum/5120



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

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

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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "5120 - 5376",
    "as_handle" : "AS5120",
    "as_name" : "DNIC-ASBLK-05120-05376",
    "tech_contacts" : [ "REGIS10-ARIN", "MIL-HSTMST-ARIN" ],
    "abuse_contacts" : [ "MIL-HSTMST-ARIN" ],
    "date_created" : "1995-05-09",
    "date_updated" : "2026-09-25",
    "source" : "https://rdap.arin.net/registry/autnum/5120"
  } ],
  "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" : "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"
  }, {
    "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"
  } ],
  "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
AS747	Headquarters, USAISC	US

Upstreams

AS Number	Description	Country
AS747	Headquarters, USAISC	US