ASN AS357 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS357?

AS357 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.

AS357 United States Department of Defense

ASN Lookup Tool

United States Department of Defense defense.gov

US 23 Routes

AS Data

AS357

AS357 – United States Department of Defense

AS Number	357
AS Name	DNIC-ASBLK-00306-00371
Organization	United States Department of Defense (usddd)
Country	US
Website	defense.gov
Number of IPv4 Routes	22
Number of IPv6 Routes	1
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	1989-06-30

ASN Intelligence API for production workflows

Use ASN data for AS357 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
55.76.0.0/16	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
55.77.128.0/18	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	16384
55.77.116.0/23	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	512
55.98.0.0/18	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	16384
55.90.0.0/16	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
55.98.64.0/19	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	8192
55.77.39.0/24	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	256
55.98.96.0/19	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	8192
55.49.0.0/16	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
55.77.0.0/16	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
55.77.248.0/21	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	2048
55.77.192.0/19	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	8192
55.77.4.0/24	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	256
2608:12a:5500::/40	AS357	United States Department of Defense DoD	United States Department of Defense	~309×10²⁴
55.98.0.0/16	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
55.77.224.0/20	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	4096
55.77.212.0/23	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	512
55.77.118.0/24	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	256
55.77.208.0/22	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	1024
55.77.0.0/17	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	32768
55.98.128.0/18	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	16384
55.99.0.0/16	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	65536
55.98.192.0/18	AS357	United States Department of Defense DoD	U.S. Army Information Systems Command	16384

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:       306 - 371
ASName:         DNIC-ASBLK-00306-00371
ASHandle:       AS306
RegDate:        1989-06-30
Updated:        2025-09-12
Ref:            https://rdap.arin.net/registry/autnum/306



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" : "306 - 371",
    "as_handle" : "AS306",
    "as_name" : "DNIC-ASBLK-00306-00371",
    "tech_contacts" : [ "MIL-HSTMST-ARIN", "REGIS10-ARIN" ],
    "abuse_contacts" : [ "MIL-HSTMST-ARIN" ],
    "date_created" : "1989-06-30",
    "date_updated" : "2025-09-12",
    "source" : "https://rdap.arin.net/registry/autnum/306"
  } ],
  "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
AS306	United States Department of Defense	US

Upstreams

AS Number	Description	Country
AS306	United States Department of Defense	US