ASN AS11509 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS11509?

AS11509 is listed under Tierzero.

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.

AS11509 Tierzero | IPGeolocation.io

ASN Lookup Tool

Tierzero tierzero.com

US 21 Routes

AS Data

AS11509

AS11509 – Tierzero

AS Number	11509
AS Name	TIERZERO-AS11509
Organization	Tierzero(tierz)
Country	US
Website	tierzero.com
Number of IPv4 Routes	20
Number of IPv6 Routes	1
ASN type	ISP
Registry	ARIN
Date Allocated	1998-09-15

ASN Intelligence API for production workflows

Use ASN data for AS11509 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
216.31.150.0/23	AS11509	Tierzero	Tier Zero	512
2604:4bc0::/36	AS11509	Tierzero	Tierzero	~5×10²⁷
216.116.104.0/21	AS11509	Tierzero	CompuData	2048
216.116.120.0/22	AS11509	Tierzero	Tierzero	1024
208.179.0.0/16	AS11509	Tierzero	TIERZERO	65536
216.31.128.0/20	AS11509	Tierzero	Tierzero	4096
216.31.148.0/24	AS11509	Tierzero	Tier Zero	256
64.239.128.0/18	AS11509	Tierzero	TIERZERO	16384
162.142.73.0/24	AS11509	Tierzero	THE WHEEL AND TIRE CLUB, INC	256
216.116.100.0/22	AS11509	Tierzero	English Language Institute China	1024

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:       11509
ASName:         TIERZERO-AS11509
ASHandle:       AS11509
RegDate:        1998-09-15
Updated:        2012-02-24    
Ref:            https://rdap.arin.net/registry/autnum/11509


OrgName:        Tierzero
OrgId:          TIERZ
Address:        77 N Mentor Ave
City:           Pasadena
StateProv:      CA
PostalCode:     91106
Country:        US
RegDate:        2004-05-21
Updated:        2024-11-25
Ref:            https://rdap.arin.net/registry/entity/TIERZ


OrgTechHandle: TECHT-ARIN
OrgTechName:   TECH-TIERZERO
OrgTechPhone:  +1-213-784-1397 
OrgTechEmail:  ipnetworkops@tierzero.net
OrgTechRef:    https://rdap.arin.net/registry/entity/TECHT-ARIN

OrgAbuseHandle: ABUSE3154-ARIN
OrgAbuseName:   Abuse Department
OrgAbusePhone:  +1-213-784-1400 
OrgAbuseEmail:  abuse@tierzero.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE3154-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
AS1299	Arelion Sweden AB	SE
AS6461	Zayo Bandwidth	US

Upstreams

AS Number	Description	Country
AS1299	Arelion Sweden AB	SE
AS6461	Zayo Bandwidth	US

Contacts

Email Contacts

ipnetworkops@tierzero.net

Abuse Contacts

abuse@tierzero.com