ASN AS21903 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21903?

AS21903 is listed under Arnhem Networks LLC.

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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AS21903 Arnhem Networks LLC | IPGeolocation.io

ASN Lookup Tool

Arnhem Networks LLC arnhemnetworks.com

US 9 Routes

AS Data

AS21903

AS21903 – Arnhem Networks LLC

AS Number	21903
AS Name	ARNHEM-01
Organization	Arnhem Networks LLC (anl-357)
Country	US
Website	arnhemnetworks.com
Number of IPv4 Routes	1
Number of IPv6 Routes	8
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2023-06-20

ASN Intelligence API for production workflows

Use ASN data for AS21903 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2602:fa6d:abc::/48	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~1×10²⁴
2602:fa6d:40::/43	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~39×10²⁴
2602:fa6d:200::/47	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~2×10²⁴
2602:fa6d:78::/47	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~2×10²⁴
2602:fa6d:64::/47	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~2×10²⁴
2602:fa6d:70::/46	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~5×10²⁴
2602:fa6d:60::/46	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~5×10²⁴
2602:fa6d:80::/46	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	~5×10²⁴
23.183.104.0/24	AS21903	Arnhem Networks LLC	Arnhem Networks LLC	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:       21903
ASName:         ARNHEM-01
ASHandle:       AS21903
RegDate:        2023-06-20
Updated:        2024-04-19
Comment:        https://arnhemnetworks.com
Comment:        noc@arnhemnetworks.com
Ref:            https://rdap.arin.net/registry/autnum/21903


OrgName:        Arnhem Networks LLC
OrgId:          ANL-357
Address:        6947 Coal Creek Parkway SE
Address:        PMB 247
City:           Newcastle
StateProv:      WA
PostalCode:     98059
Country:        US
RegDate:        2022-05-06
Updated:        2023-06-22
Comment:        Visit us on the world-wide-web at https://www.arnhemnetworks.com
Ref:            https://rdap.arin.net/registry/entity/ANL-357


OrgNOCHandle: ANN11-ARIN
OrgNOCName:   Arnhem Networks NOC
OrgNOCPhone:  +1-206-593-4600 
OrgNOCEmail:  noc@arnhemnetworks.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/ANN11-ARIN

OrgTechHandle: ANN11-ARIN
OrgTechName:   Arnhem Networks NOC
OrgTechPhone:  +1-206-593-4600 
OrgTechEmail:  noc@arnhemnetworks.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ANN11-ARIN

OrgAbuseHandle: ANN11-ARIN
OrgAbuseName:   Arnhem Networks NOC
OrgAbusePhone:  +1-206-593-4600 
OrgAbuseEmail:  noc@arnhemnetworks.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ANN11-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" : "21903",
    "as_handle" : "AS21903",
    "as_name" : "ARNHEM-01",
    "tech_contacts" : [ "ANN11-ARIN" ],
    "abuse_contacts" : [ "ANN11-ARIN" ],
    "date_created" : "2023-06-20",
    "date_updated" : "2024-04-19",
    "source" : "https://rdap.arin.net/registry/autnum/21903"
  } ],
  "organization" : {
    "handle" : "ANL-357",
    "name" : "Arnhem Networks LLC",
    "address" : [ "6947 Coal Creek Parkway SE", "PMB 247", "Newcastle", "WA", "98059", "US" ],
    "street" : "Coal Creek Parkway",
    "city" : "Newcastle",
    "state" : "WA",
    "zip_code" : "98059",
    "country" : [ "US" ],
    "date_created" : "2022-05-06",
    "date_updated" : "2023-06-22",
    "source" : "https://rdap.arin.net/registry/entity/ANL-357",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "ANN11-ARIN",
    "name" : "Arnhem Networks NOC",
    "email" : [ "noc@arnhemnetworks.com" ],
    "phone" : [ "+1-206-593-4600" ],
    "source" : "https://rdap.arin.net/registry/entity/ANN11-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "ANN11-ARIN",
    "name" : "Arnhem Networks NOC",
    "email" : [ "noc@arnhemnetworks.com" ],
    "phone" : [ "+1-206-593-4600" ],
    "source" : "https://rdap.arin.net/registry/entity/ANN11-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS13830	PureVoltage Hosting Inc.	US
AS401903	Crimson Pacific Networks, LLC	US
AS26073	Cofractal, Inc.	US
AS58057	Securebit AG	CH
AS398447	OHANACRAFT, LLC	US
AS35008	Kerfuffle, LLC	US
AS34927	iFog GmbH	CH
AS6939	Hurricane Electric LLC	US
AS20473	The Constant Company, LLC	US
AS8298	IPng Networks GmbH	CH

Upstreams

AS Number	Description	Country
AS13830	PureVoltage Hosting Inc.	US
AS26073	Cofractal, Inc.	US
AS58057	Securebit AG	CH
AS60011	Mythic Beasts Ltd	GB
AS6939	Hurricane Electric LLC	US
AS20473	The Constant Company, LLC	US
AS8298	IPng Networks GmbH	CH
AS400587	Ryamer, LLC	US
AS917	Misaka Network, Inc.	US