ASN AS21525 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21525?

AS21525 is listed under Seattle Public Library.

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.

AS21525 Seattle Public Library

ASN Lookup Tool

Seattle Public Library spl.org

US 2 Routes

AS Data

AS21525

AS21525 – Seattle Public Library

AS Number	21525
AS Name	AS-SPL
Organization	Seattle Public Library(spl)
Country	US
Website	spl.org
Number of IPv4 Routes	1
Number of IPv6 Routes	1
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2001-05-16

ASN Intelligence API for production workflows

Use ASN data for AS21525 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
2620:18::/48	AS21525	Seattle Public Library	Seattle Public Library	~1×10²⁴
66.212.64.0/20	AS21525	Seattle Public Library	Seattle Public Library	4096

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:       21525
ASName:         AS-SPL
ASHandle:       AS21525
RegDate:        2001-05-16
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/21525


OrgName:        Seattle Public Library
OrgId:          SPL
Address:        1000 4th Avenue
City:           Seattle
StateProv:      WA
PostalCode:     98104-1109
Country:        US
RegDate:        1993-05-17
Updated:        2011-09-24
Ref:            https://rdap.arin.net/registry/entity/SPL


OrgAbuseHandle: NETWO3608-ARIN
OrgAbuseName:   Network Operations
OrgAbusePhone:  +1-206-386-4170 
OrgAbuseEmail:  netops@spl.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETWO3608-ARIN

OrgTechHandle: NETWO3608-ARIN
OrgTechName:   Network Operations
OrgTechPhone:  +1-206-386-4170 
OrgTechEmail:  netops@spl.org
OrgTechRef:    https://rdap.arin.net/registry/entity/NETWO3608-ARIN

RTechHandle: NETWO3608-ARIN
RTechName:   Network Operations
RTechPhone:  +1-206-386-4170 
RTechEmail:  netops@spl.org
RTechRef:    https://rdap.arin.net/registry/entity/NETWO3608-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
AS58511	Anycast Global Backbone	AU
AS24482	SG.GS	SG
AS3786	LG DACOM Corporation	KR
AS393577	Tritan Development	US
AS34927	iFog GmbH	CH
AS401703	Ordinal Advisors LLC	US
AS6939	Hurricane Electric LLC	US
AS64289	Macarne.com	US
AS10242	US Internet Corp	US
AS2914	NTT America, Inc.	US

Upstreams

AS Number	Description	Country
AS7575	Australian Academic and Research Network	AU
AS394256	Tech Futures Interactive Inc.	CA
AS9002	RETN Limited	GB
AS6939	Hurricane Electric LLC	US
AS2914	NTT America, Inc.	US
AS6461	Zayo Bandwidth	US
AS137409	GSL Networks Pty LTD	AU