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AS21975 LOOMIS SAYLES & CO., LP

Q: Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

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LOOMIS SAYLES & CO., LP loomissayles.com

US 4 Routes

AS Data

AS21975

AS21975 – LOOMIS SAYLES & CO., LP

AS Number	21975
AS Name	LOOMISSAYLES
Organization	LOOMIS SAYLES & CO., LP (lsl46)
Country	US
Website	loomissayles.com
Number of IPv4 Routes	4
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2011-10-20

ASN Intelligence API for production workflows

Use ASN data for AS21975 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
63.104.155.0/24	AS21975	LOOMIS SAYLES & CO., LP	NIM OS, LLC	256
63.118.230.0/24	AS21975	LOOMIS SAYLES & CO., LP	LOOMIS, SAYLES & COMPANY, L P	256
65.196.55.0/24	AS21975	LOOMIS SAYLES & CO., LP	Loomis, Sayles & Company, L P	256
65.196.54.0/24	AS21975	LOOMIS SAYLES & CO., LP	Loomis, Sayles & Company, L P	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:       21975
ASName:         LOOMISSAYLES
ASHandle:       AS21975
RegDate:        2011-10-20
Updated:        2011-10-20
Comment:        http://www.loomissayles.com
Ref:            https://rdap.arin.net/registry/autnum/21975


OrgName:        LOOMIS SAYLES & CO., LP
OrgId:          LSL46
Address:        1 FINANCIAL CENTER SUITE 26
City:           Boston
StateProv:      MA
PostalCode:     02111
Country:        US
RegDate:        2010-07-27
Updated:        2014-05-29
Ref:            https://rdap.arin.net/registry/entity/LSL46


OrgTechHandle: NETAD165-ARIN
OrgTechName:   NetAdmin
OrgTechPhone:  +1-617-482-2450 
OrgTechEmail:  network@loomissayles.com
OrgTechRef:    https://rdap.arin.net/registry/entity/NETAD165-ARIN

OrgNOCHandle: NETAD165-ARIN
OrgNOCName:   NetAdmin
OrgNOCPhone:  +1-617-482-2450 
OrgNOCEmail:  network@loomissayles.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/NETAD165-ARIN

OrgAbuseHandle: NETAD165-ARIN
OrgAbuseName:   NetAdmin
OrgAbusePhone:  +1-617-482-2450 
OrgAbuseEmail:  network@loomissayles.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NETAD165-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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "21975",
    "as_handle" : "AS21975",
    "as_name" : "LOOMISSAYLES",
    "tech_contacts" : [ "NETAD165-ARIN" ],
    "abuse_contacts" : [ "NETAD165-ARIN" ],
    "date_created" : "2011-10-20",
    "date_updated" : "2011-10-20",
    "source" : "https://rdap.arin.net/registry/autnum/21975"
  } ],
  "organization" : {
    "handle" : "LSL46",
    "name" : "LOOMIS SAYLES & CO., LP",
    "address" : [ "1 FINANCIAL CENTER SUITE 26", "Boston", "MA", "02111", "US" ],
    "street" : "Financial Center",
    "city" : "Boston",
    "state" : "MA",
    "zip_code" : "02111",
    "country" : [ "US" ],
    "date_created" : "2010-07-27",
    "date_updated" : "2014-05-29",
    "source" : "https://rdap.arin.net/registry/entity/LSL46",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "NETAD165-ARIN",
    "name" : "NetAdmin",
    "email" : [ "network@loomissayles.com" ],
    "phone" : [ "+1-617-482-2450" ],
    "source" : "https://rdap.arin.net/registry/entity/NETAD165-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "NETAD165-ARIN",
    "name" : "NetAdmin",
    "email" : [ "network@loomissayles.com" ],
    "phone" : [ "+1-617-482-2450" ],
    "source" : "https://rdap.arin.net/registry/entity/NETAD165-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS7046	Verizon Business	US
AS1239	Cogent Communications, LLC	US
AS701	Verizon Business/UUnet	US
AS174	Cogent Communications, LLC	US
AS701	Verizon Business	US
AS23132	Charter Communications LLC	US

Upstreams

AS Number	Description	Country
AS7046	Verizon Business	US
AS174	Cogent Communications, LLC	US
AS701	Verizon Business	US
AS23132	Charter Communications LLC	US

Frequently Asked Questions

What is ASN AS21975?

ASN AS21975 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21975?

AS21975 is listed under LOOMIS SAYLES & CO., LP.

What do peers, upstreams, and downstreams mean?

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 included here?

WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.