ASN AS11603 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS11603?

AS11603 is listed under Watermark Estate Management Services, 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?

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.

AS11603 Watermark Estate Management Services, LLC

ASN Lookup Tool

Watermark Estate Management Services, LLC watermark-llc.com

US 1 Routes

AS Data

AS11603

AS11603 – Watermark Estate Management Services, LLC

AS Number	11603
AS Name	WATERMARK
Organization	Watermark Estate Management Services, LLC(water-61)
Country	US
Website	watermark-llc.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2008-12-04

ASN Intelligence API for production workflows

Use ASN data for AS11603 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

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
65.126.55.0/24	AS11603	Watermark Estate Management Services, LLC	WATERMARK 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:       11603
ASName:         WATERMARK
ASHandle:       AS11603
RegDate:        2008-12-04
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/11603


OrgName:        Watermark Estate Management Services, LLC
OrgId:          WATER-61
Address:        15120 NE 92nd St
City:           Redmond
StateProv:      WA
PostalCode:     98052
Country:        US
RegDate:        2008-11-25
Updated:        2008-11-25
Ref:            https://rdap.arin.net/registry/entity/WATER-61


OrgAbuseHandle: NETAD98-ARIN
OrgAbuseName:   NetAdmin
OrgAbusePhone:  +1-425-893-5500 
OrgAbuseEmail:  nadmin@watermark-llc.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETAD98-ARIN

OrgNOCHandle: NETAD98-ARIN
OrgNOCName:   NetAdmin
OrgNOCPhone:  +1-425-893-5500 
OrgNOCEmail:  nadmin@watermark-llc.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/NETAD98-ARIN

OrgTechHandle: NETAD98-ARIN
OrgTechName:   NetAdmin
OrgTechPhone:  +1-425-893-5500 
OrgTechEmail:  nadmin@watermark-llc.com
OrgTechRef:    https://rdap.arin.net/registry/entity/NETAD98-ARIN

RAbuseHandle: NETAD98-ARIN
RAbuseName:   NetAdmin
RAbusePhone:  +1-425-893-5500 
RAbuseEmail:  nadmin@watermark-llc.com
RAbuseRef:    https://rdap.arin.net/registry/entity/NETAD98-ARIN

RNOCHandle: NETAD98-ARIN
RNOCName:   NetAdmin
RNOCPhone:  +1-425-893-5500 
RNOCEmail:  nadmin@watermark-llc.com
RNOCRef:    https://rdap.arin.net/registry/entity/NETAD98-ARIN

RTechHandle: NETAD98-ARIN
RTechName:   NetAdmin
RTechPhone:  +1-425-893-5500 
RTechEmail:  nadmin@watermark-llc.com
RTechRef:    https://rdap.arin.net/registry/entity/NETAD98-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
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US