ASN AS1637 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS1637?

AS1637 is listed under U.S. Army Information Systems Command.

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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AS1637 U.S. Army Information Systems Command

U.S. Army Information Systems Command army.mil

US 118 Routes

AS Data

AS1637

AS1637 – U.S. Army Information Systems Command

AS Number	1637
AS Name	DNIC-AS-01637
Organization	U.S. Army Information Systems Command (headqu-3)
Country	US
Website	army.mil
Number of IPv4 Routes	117
Number of IPv6 Routes	1
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2004-05-12

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Use ASN data for AS1637 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
6.16.88.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.147.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.23.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.53.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.48.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.224.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.10.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.134.0/23	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	512
155.20.109.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.142.0/23	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	512
155.6.32.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.245.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.18.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.41.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.22.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.26.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.128.0/23	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	512
143.46.17.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.140.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.35.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.144.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.33.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.110.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
2608:c141:30::/48	AS1637	Headquarters, USAISC	United States Department of Defense	~1×10²⁴
143.46.26.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.34.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.218.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.0.0/16	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	65536
155.6.56.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.219.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.32.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.25.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.20.103.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.27.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.220.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.20.102.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.20.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.116.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.57.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.53.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.35.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.150.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.37.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.141.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.216.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.143.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.116.0/22	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	1024
155.6.29.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.48.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.35.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.49.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.39.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.164.0/22	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	1024
143.46.8.0/23	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	512
143.46.39.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.5.16.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
155.6.98.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.0.0/16	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	65536
143.46.48.0/24	AS1637	Headquarters, USAISC	U.S. Army Information Systems Command	256
143.46.18.0/24	AS1637	Headquarters, USAISC	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:       1637
ASName:         DNIC-AS-01637
ASHandle:       AS1637
RegDate:        2004-05-12
Updated:        2011-08-24
Ref:            https://rdap.arin.net/registry/autnum/1637


OrgName:        Headquarters, USAISC
OrgId:          HEADQU-3
Address:        NETC-ANC CONUS TNOSC
City:           Fort Huachuca
StateProv:      AZ
PostalCode:     85613
Country:        US
RegDate:        1990-03-26
Updated:        2026-08-12
Ref:            https://rdap.arin.net/registry/entity/HEADQU-3


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: REGIS10-ARIN
OrgAbuseName:   Registration
OrgAbusePhone:  +1-844-347-2457 
OrgAbuseEmail:  disa.columbus.ns.mbx.arin-registrations@mail.mil
OrgAbuseRef:    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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "1637",
    "as_handle" : "AS1637",
    "as_name" : "DNIC-AS-01637",
    "tech_contacts" : [ "REGIS10-ARIN" ],
    "abuse_contacts" : [ "REGIS10-ARIN" ],
    "date_created" : "2004-05-12",
    "date_updated" : "2011-08-24",
    "source" : "https://rdap.arin.net/registry/autnum/1637"
  } ],
  "organization" : {
    "handle" : "HEADQU-3",
    "name" : "Headquarters, USAISC",
    "address" : [ "NETC-ANC CONUS TNOSC", "Fort Huachuca", "AZ", "85613", "US" ],
    "city" : "Fort Huachuca",
    "state" : "AZ",
    "zip_code" : "85613",
    "country" : [ "US" ],
    "date_created" : "1990-03-26",
    "date_updated" : "2026-08-12",
    "source" : "https://rdap.arin.net/registry/entity/HEADQU-3",
    "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"
  } ],
  "abuse_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"
  } ]
}

Peers

AS Number	Description	Country
AS27066	United States Department of Defense	US

Upstreams

AS Number	Description	Country
AS27066	United States Department of Defense	US

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