ASN AS31883 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS31883?

AS31883 is listed under Thornburg Investment Management Inc..

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.

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AS31883 Thornburg Investment Management Inc.

ASN Lookup Tool

Thornburg Investment Management Inc. thornburg.com

US 3 Routes

AS Data

AS31883

AS31883 – Thornburg Investment Management Inc.

AS Number	31883
AS Name	TIM-2300
Organization	Thornburg Investment Management Inc. (tim-50)
Country	US
Website	thornburg.com
Number of IPv4 Routes	3
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2020-01-09

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Use ASN data for AS31883 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
50.222.105.0/24	AS31883	Thornburg Investment Management Inc.	Comcast Cable Communications, LLC	256
66.59.217.0/24	AS31883	Thornburg Investment Management Inc.	Thornburg Investment Management Inc.	256
207.224.188.0/24	AS31883	Thornburg Investment Management Inc.	Thornburg Investment Management Inc.	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:       31883
ASName:         TIM-2300
ASHandle:       AS31883
RegDate:        2020-01-09
Updated:        2020-01-09
Ref:            https://rdap.arin.net/registry/autnum/31883


OrgName:        Thornburg Investment Management Inc.
OrgId:          TIM-50
Address:        2300 N. Ridgetop Road
City:           Santa Fe
StateProv:      NM
PostalCode:     87506
Country:        US
RegDate:        2019-12-23
Updated:        2026-06-18
Ref:            https://rdap.arin.net/registry/entity/TIM-50


OrgNOCHandle: MASOP1-ARIN
OrgNOCName:   Masopust, Brad 
OrgNOCPhone:  +1-505-470-6816 
OrgNOCEmail:  bmasopust@thornburg.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/MASOP1-ARIN

OrgTechHandle: LAWSN2-ARIN
OrgTechName:   Laws, Noah 
OrgTechPhone:  +1-505-467-7184 
OrgTechEmail:  nlaws@thornburg.com
OrgTechRef:    https://rdap.arin.net/registry/entity/LAWSN2-ARIN

OrgDNSHandle: LAWSN1-ARIN
OrgDNSName:   Laws, Noah 
OrgDNSPhone:  +1-505-467-7184 
OrgDNSEmail:  nlaws@thornburg.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/LAWSN1-ARIN

OrgRoutingHandle: LAWSN1-ARIN
OrgRoutingName:   Laws, Noah 
OrgRoutingPhone:  +1-505-467-7184 
OrgRoutingEmail:  nlaws@thornburg.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/LAWSN1-ARIN

OrgDNSHandle: MASOP1-ARIN
OrgDNSName:   Masopust, Brad 
OrgDNSPhone:  +1-505-470-6816 
OrgDNSEmail:  bmasopust@thornburg.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/MASOP1-ARIN

OrgNOCHandle: LAWSN1-ARIN
OrgNOCName:   Laws, Noah 
OrgNOCPhone:  +1-505-467-7184 
OrgNOCEmail:  nlaws@thornburg.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/LAWSN1-ARIN

OrgRoutingHandle: MASOP1-ARIN
OrgRoutingName:   Masopust, Brad 
OrgRoutingPhone:  +1-505-470-6816 
OrgRoutingEmail:  bmasopust@thornburg.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/MASOP1-ARIN

OrgTechHandle: LAWSN1-ARIN
OrgTechName:   Laws, Noah 
OrgTechPhone:  +1-505-467-7184 
OrgTechEmail:  nlaws@thornburg.com
OrgTechRef:    https://rdap.arin.net/registry/entity/LAWSN1-ARIN

OrgTechHandle: MASOP1-ARIN
OrgTechName:   Masopust, Brad 
OrgTechPhone:  +1-505-470-6816 
OrgTechEmail:  bmasopust@thornburg.com
OrgTechRef:    https://rdap.arin.net/registry/entity/MASOP1-ARIN

OrgAbuseHandle: MASOP1-ARIN
OrgAbuseName:   Masopust, Brad 
OrgAbusePhone:  +1-505-470-6816 
OrgAbuseEmail:  bmasopust@thornburg.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MASOP1-ARIN

OrgAbuseHandle: LAWSN1-ARIN
OrgAbuseName:   Laws, Noah 
OrgAbusePhone:  +1-505-467-7184 
OrgAbuseEmail:  nlaws@thornburg.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/LAWSN1-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" : "31883",
    "as_handle" : "AS31883",
    "as_name" : "TIM-2300",
    "admin_contacts" : [ "LAWSN1-ARIN", "MASOP1-ARIN" ],
    "tech_contacts" : [ "LAWSN2-ARIN", "LAWSN1-ARIN", "MASOP1-ARIN", "LAWSN1-ARIN", "MASOP1-ARIN" ],
    "abuse_contacts" : [ "MASOP1-ARIN", "LAWSN1-ARIN" ],
    "date_created" : "2020-01-09",
    "date_updated" : "2020-01-09",
    "source" : "https://rdap.arin.net/registry/autnum/31883"
  } ],
  "organization" : {
    "handle" : "TIM-50",
    "name" : "Thornburg Investment Management Inc.",
    "address" : [ "2300 N. Ridgetop Road", "Santa Fe", "NM", "87506", "US" ],
    "street" : "N. Ridgetop Road",
    "city" : "Santa Fe",
    "state" : "NM",
    "zip_code" : "87506",
    "country" : [ "US" ],
    "date_created" : "2019-12-23",
    "date_updated" : "2026-06-18",
    "source" : "https://rdap.arin.net/registry/entity/TIM-50",
    "addressCountry" : "US"
  },
  "administrative_contacts" : [ {
    "handle" : "LAWSN1-ARIN",
    "name" : "Laws, Noah",
    "email" : [ "nlaws@thornburg.com" ],
    "phone" : [ "+1-505-467-7184" ],
    "source" : "https://rdap.arin.net/registry/entity/LAWSN1-ARIN"
  }, {
    "handle" : "MASOP1-ARIN",
    "name" : "Masopust, Brad",
    "email" : [ "bmasopust@thornburg.com" ],
    "phone" : [ "+1-505-470-6816" ],
    "source" : "https://rdap.arin.net/registry/entity/MASOP1-ARIN"
  } ],
  "technical_contacts" : [ {
    "handle" : "LAWSN2-ARIN",
    "name" : "Laws, Noah",
    "email" : [ "nlaws@thornburg.com" ],
    "phone" : [ "+1-505-467-7184" ],
    "source" : "https://rdap.arin.net/registry/entity/LAWSN2-ARIN"
  }, {
    "handle" : "LAWSN1-ARIN",
    "name" : "Laws, Noah",
    "email" : [ "nlaws@thornburg.com" ],
    "phone" : [ "+1-505-467-7184" ],
    "source" : "https://rdap.arin.net/registry/entity/LAWSN1-ARIN"
  }, {
    "handle" : "MASOP1-ARIN",
    "name" : "Masopust, Brad",
    "email" : [ "bmasopust@thornburg.com" ],
    "phone" : [ "+1-505-470-6816" ],
    "source" : "https://rdap.arin.net/registry/entity/MASOP1-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "MASOP1-ARIN",
    "name" : "Masopust, Brad",
    "email" : [ "bmasopust@thornburg.com" ],
    "phone" : [ "+1-505-470-6816" ],
    "source" : "https://rdap.arin.net/registry/entity/MASOP1-ARIN"
  }, {
    "handle" : "LAWSN1-ARIN",
    "name" : "Laws, Noah",
    "email" : [ "nlaws@thornburg.com" ],
    "phone" : [ "+1-505-467-7184" ],
    "source" : "https://rdap.arin.net/registry/entity/LAWSN1-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS33654	Comcast Cable Communications, LLC	US
AS1000	LINK AMERICAN	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS33654	Comcast Cable Communications, LLC	US
AS3356	Level 3 Parent, LLC	US