ASN AS19209 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS19209?

AS19209 is listed under Grantham, Mayo, VanOtterloo & Co. 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.

AS19209 Grantham, Mayo, VanOtterloo & Co. LLC

ASN Lookup Tool

Grantham, Mayo, VanOtterloo & Co. LLC gmo.com

US 2 Routes

AS Data

AS19209

AS19209 – Grantham, Mayo, VanOtterloo & Co. LLC

AS Number	19209
AS Name	GMO-BOSTON
Organization	Grantham, Mayo, VanOtterloo & Co. LLC(gmvcl)
Country	US
Website	gmo.com
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2000-12-05

ASN Intelligence API for production workflows

Use ASN data for AS19209 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
192.235.80.0/24	AS19209	Grantham, Mayo, VanOtterloo & Co. LLC	Telx	256
69.147.188.0/24	AS19209	Grantham, Mayo, VanOtterloo & Co. LLC	TierPoint, 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:       19209
ASName:         GMO-BOSTON
ASHandle:       AS19209
RegDate:        2000-12-05
Updated:        2012-02-24    
Ref:            https://rdap.arin.net/registry/autnum/19209


OrgName:        Grantham, Mayo, VanOtterloo & Co. LLC
OrgId:          GMVCL
Address:        40 Rowes Wharf
City:           Boston
StateProv:      MA
PostalCode:     02110
Country:        US
RegDate:        2000-12-05
Updated:        2014-11-11
Ref:            https://rdap.arin.net/registry/entity/GMVCL


OrgTechHandle: JC1763-ARIN
OrgTechName:   Cunniff, Jack 
OrgTechPhone:  +1-617-719-7848 
OrgTechEmail:  itnetworking@gmo.com
OrgTechRef:    https://rdap.arin.net/registry/entity/JC1763-ARIN

OrgTechHandle: THERI9-ARIN
OrgTechName:   Theriault, Mike 
OrgTechPhone:  +1-978-944-2619 
OrgTechEmail:  mike.theriault@gmo.com
OrgTechRef:    https://rdap.arin.net/registry/entity/THERI9-ARIN

OrgAbuseHandle: THERI9-ARIN
OrgAbuseName:   Theriault, Mike 
OrgAbusePhone:  +1-978-944-2619 
OrgAbuseEmail:  mike.theriault@gmo.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/THERI9-ARIN

OrgAbuseHandle: JC1763-ARIN
OrgAbuseName:   Cunniff, Jack 
OrgAbusePhone:  +1-617-719-7848 
OrgAbuseEmail:  itnetworking@gmo.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/JC1763-ARIN

OrgNOCHandle: THERI9-ARIN
OrgNOCName:   Theriault, Mike 
OrgNOCPhone:  +1-978-944-2619 
OrgNOCEmail:  mike.theriault@gmo.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/THERI9-ARIN

RTechHandle: JC1763-ARIN
RTechName:   Cunniff, Jack 
RTechPhone:  +1-617-719-7848 
RTechEmail:  itnetworking@gmo.com
RTechRef:    https://rdap.arin.net/registry/entity/JC1763-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
AS1239	Cogent Communications, LLC	US
AS174	Cogent Communications, LLC	US
AS36086	Telx	US

Upstreams

AS Number	Description	Country
AS174	Cogent Communications, LLC	US
AS36086	Telx	US