asn.dev

Autonomous system

AS21975 LOOMISSAYLES - LOOMIS SAYLES & CO., LP

Unclassified ARIN

IPv4 addresses 1.02K 3 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 4 0 downstream
Flagged prefixes 0 none

Summary

Loomis Sayles

United States of America · AI-generated

business finance corporate

The AS handle LOOMISSAYLES is held by Loomis Sayles & Company, L.P.

What it's used for

  • The address space carries corporate infrastructure for an investment management firm, evidenced by reverse DNS entries like user128.loomissayles.com and netnames such as UU-65-196-54.
  • The AS announces 1024 IPv4 addresses across 3 prefixes with 4 observed neighbours, a ratio consistent with a small internal corporate estate rather than a transit or access network.

Notable

  • Registrants largely align with the announcer, with Loomis, Sayles & Company, L P listed for two of the three prefixes, while one prefix is registered to NIM-OS, LLC.
  • The inventory consists of three distinct IPv4 blocks, including a /23 and two /24s, with no IPv6 prefixes announced.

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

4 upstream, 0 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS701Verizon Business126
AS46887Crown Castle Fiber LLC54
AS23132Charter Communications LLC44
AS7046Verizon Business19

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-02, 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 3 prefixes · 1.02K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America3

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS21975
Registry name
LOOMISSAYLES
Registrant
LOOMIS SAYLES & CO., LP
Abuse contact
network@loomissayles.com
Registered
2011-10-20
Last changed
2011-10-20
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 4 valid, 0 with no ROA
ROAs
4 authorising AS21975
ASPA
no ASPA record
IRR
100% registered · 4 of 4 announcements
Route objects
10 naming AS21975

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: 448 networks and 1,851 prefixes, as published 2026-11-03. 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