What is ASN AS399551?

ASN AS399551 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS399551?

AS399551 is listed under Millennium Systems, 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?

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AS399551 Millennium Systems, Inc.

ASN Lookup Tool

Millennium Systems, Inc. nextmill.net

US 2 Routes

AS Data

AS399551

AS399551 – Millennium Systems, Inc.

AS Number	399551
AS Name	MILLENNIUM-SYSTEMS-INC
Organization	Millennium Systems, Inc.(ms-1792)
Country	US
Website	nextmill.net
Number of IPv4 Routes	1
Number of IPv6 Routes	1
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2021-04-13

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Use ASN data for AS399551 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2606:4ec0::/32	AS399551	Millennium Systems, Inc.	Millennium Systems, Inc.	~79×10²⁷
23.191.112.0/24	AS399551	Millennium Systems, Inc.	Millennium Systems, 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:       399551
ASName:         MILLENNIUM-SYSTEMS-INC
ASHandle:       AS399551
RegDate:        2021-04-13
Updated:        2021-04-13
Comment:        https://millsys.com    
Ref:            https://rdap.arin.net/registry/autnum/399551


OrgName:        Millennium Systems, Inc.
OrgId:          MS-1792
Address:        580 Wald
City:           Irvine
StateProv:      CA
PostalCode:     92618
Country:        US
RegDate:        2021-04-08
Updated:        2024-11-25
Comment:        http://www.millsys.com
Comment:        Standard NOC hours 7:00 AM to 6:00 PM PST
Ref:            https://rdap.arin.net/registry/entity/MS-1792


OrgTechHandle: ARINA288-ARIN
OrgTechName:   ARIN Admin
OrgTechPhone:  +1-949-252-8772 
OrgTechEmail:  arin@nextmill.net
OrgTechRef:    https://rdap.arin.net/registry/entity/ARINA288-ARIN

OrgAbuseHandle: ARINA288-ARIN
OrgAbuseName:   ARIN Admin
OrgAbusePhone:  +1-949-252-8772 
OrgAbuseEmail:  arin@nextmill.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ARINA288-ARIN

OrgRoutingHandle: ARINA288-ARIN
OrgRoutingName:   ARIN Admin
OrgRoutingPhone:  +1-949-252-8772 
OrgRoutingEmail:  arin@nextmill.net
OrgRoutingRef:    https://rdap.arin.net/registry/entity/ARINA288-ARIN

OrgNOCHandle: ARINA288-ARIN
OrgNOCName:   ARIN Admin
OrgNOCPhone:  +1-949-252-8772 
OrgNOCEmail:  arin@nextmill.net
OrgNOCRef:    https://rdap.arin.net/registry/entity/ARINA288-ARIN

OrgDNSHandle: ARINA288-ARIN
OrgDNSName:   ARIN Admin
OrgDNSPhone:  +1-949-252-8772 
OrgDNSEmail:  arin@nextmill.net
OrgDNSRef:    https://rdap.arin.net/registry/entity/ARINA288-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
AS46887	Crown Castle Fiber LLC	US

Upstreams

AS Number	Description	Country
AS46887	Crown Castle Fiber LLC	US