asn.dev

Autonomous system

AS31883 TIM-2300

Unclassified ARIN

IPv4 addresses 512 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

Thornburg Investment Management

United States of America · AI-generated

business finance internal

TIM-2300 is held by Thornburg Investment Management Inc., a global asset management firm.

What it's used for

  • The address space carries internal corporate infrastructure, evidenced by netnames INFO-THORNBURG-50 and Q0110-207-224-188-0 registered to the firm.
  • The AS announces 768 IPv4 addresses across 3 prefixes with only 2 observed neighbours, indicating a small, self-contained corporate estate rather than a transit or access network.

Notable

  • Registrants are mixed: Comcast Cable Communications, LLC holds 50.222.105.0/24, while Thornburg Investment Management Inc. holds the other two prefixes.
  • The inventory consists of three /24 blocks, one of which appears to be leased or historically associated with Comcast, while the others are directly registered to the investment firm.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS3356Level 3 Parent, LLC110
AS33654Comcast Cable Communications, LLC10

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 2 prefixes · 512 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS31883
Registry name
TIM-2300
Registrant
Thornburg Investment Management Inc.
Abuse contact
nlaws@thornburg.com
Registered
2020-01-09
Last changed
2020-01-09
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
1 authorising AS31883
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS31883

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 446 networks and 1,852 prefixes, as published 2026-10-27. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check