asn.dev

Autonomous system

AS36671 TWOSIGMA2

Unclassified ARIN

IPv4 addresses 3.58K 10 prefixes
IPv6 prefixes 7 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 9 0 downstream
Flagged prefixes 0 none

Summary

Two Sigma Investments

United States of America · AI-generated

business hedge-fund enterprise

TWOSIGMA2 is the autonomous system for Two Sigma Investments, LP.

What it's used for

  • The address space carries corporate infrastructure for a quantitative hedge fund, evidenced by netnames like TWOSIGMA-NB-0001, UK-TWOSIGMA-20101209, and LVLT-TSI-21-8-2-105.
  • The AS announces 3584 IPv4 addresses across 10 prefixes and 7 IPv6 prefixes, maintaining 9 observed neighbours; this ratio indicates an internal corporate estate rather than a transit or access network.

Notable

  • Registrants generally align with the announcer, including TWO SIGMA INVESTMENTS, LP and Two Sigma International Limited, though some prefixes list Cogent Communications, LLC and PSINet, Inc. as registrants.
  • The inventory is a mix of /24s and larger blocks, including a /22 and a /23, with some prefixes registered under legacy ISP names like LEVEL 3 COMMUNICATIONS and PCCW Global (HK) Limited.

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

9 upstream, 0 downstream and 11 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS174Cogent Communications, LLC252
AS3356Level 3 Parent, LLC209
AS1299Arelion Sweden AB173
AS3257GTT Communications Inc.73
AS3491PCCW Global (HK) Ltd.66
AS701Verizon Business38
AS6461Zayo Bandwidth38
AS7018AT&T Enterprises, LLC35

All 9 upstreams →

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-23, 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 10 prefixes · 3.58K addresses IPv6 7 prefixes

CountryNamePrefixes
USUnited States of America17

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS36671
Registry name
TWOSIGMA2
Registrant
TWO SIGMA INVESTMENTS, LP
Abuse contact
abuse@twosigma.com
Registered
2006-03-14
Last changed
2012-10-10
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
50% valid · 8 valid, 8 with no ROA
ROAs
7 authorising AS36671
ASPA
no ASPA record
IRR
100% registered · 16 of 16 announcements
Route objects
17 naming AS36671

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: 442 networks and 1,779 prefixes, as published 2026-10-24. 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