What is ASN AS400321?

ASN AS400321 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS400321?

AS400321 is listed under Arcosa, Inc..

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.

AS400321 Arcosa, Inc. | IPGeolocation.io

ASN Lookup Tool

Arcosa, Inc. arcosa.com

US 1 Routes

AS Data

AS400321

AS400321 – Arcosa, Inc.

AS Number	400321
AS Name	ARC-NET
Organization	Arcosa, Inc.(arcos-14)
Country	US
Website	arcosa.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2021-12-20

ASN Intelligence API for production workflows

Use ASN data for AS400321 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
66.103.158.0/24	AS400321	Arcosa, Inc.	Arcosa, Inc.	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:       400321
ASName:         ARC-NET
ASHandle:       AS400321
RegDate:        2021-12-20
Updated:        2021-12-20    
Ref:            https://rdap.arin.net/registry/autnum/400321


OrgName:        Arcosa, Inc.
OrgId:          ARCOS-14
Address:        500 North Akard Street
Address:        Suite 400
City:           Dallas
StateProv:      TX
PostalCode:     75201
Country:        US
RegDate:        2021-10-27
Updated:        2021-10-27
Ref:            https://rdap.arin.net/registry/entity/ARCOS-14


OrgDNSHandle: OPS28-ARIN
OrgDNSName:   OPS
OrgDNSPhone:  +1-972-942-6500 
OrgDNSEmail:  arc-ops@arcosa.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/OPS28-ARIN

OrgTechHandle: OPS28-ARIN
OrgTechName:   OPS
OrgTechPhone:  +1-972-942-6500 
OrgTechEmail:  arc-ops@arcosa.com
OrgTechRef:    https://rdap.arin.net/registry/entity/OPS28-ARIN

OrgRoutingHandle: NOC33295-ARIN
OrgRoutingName:   NOC
OrgRoutingPhone:  +1-972-942-6500 
OrgRoutingEmail:  arc-noc@arcosa.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/NOC33295-ARIN

OrgAbuseHandle: ABUSE8160-ARIN
OrgAbuseName:   Abuse
OrgAbusePhone:  +1-972-942-6500 
OrgAbuseEmail:  arc-abuse@arcosa.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE8160-ARIN

OrgNOCHandle: NOC33295-ARIN
OrgNOCName:   NOC
OrgNOCPhone:  +1-972-942-6500 
OrgNOCEmail:  arc-noc@arcosa.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/NOC33295-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
AS10796	Charter Communications Inc	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS10796	Charter Communications Inc	US
AS3356	Level 3 Parent, LLC	US

Contacts

Email Contacts

arc-noc@arcosa.com arc-ops@arcosa.com

Abuse Contacts

arc-abuse@arcosa.com