AS36671 — TWOSIGMA2

AS36671 announces 10 IPv4 prefixes covering 3,584 addresses and 1 IPv6 prefixes.

About this network

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.

Announced prefixes

• 8.2.105.0/24
• 8.245.33.0/24
• 38.27.161.0/24
• 38.97.45.0/24
• 38.108.14.0/24
• 38.117.134.0/24
• 46.183.200.0/23
• 207.226.133.0/24
• 208.77.212.0/22
• 212.133.79.0/24
• 2620:106:3000::/40

Upstream networks

• AS174 Cogent Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS1299 Arelion Sweden AB
• AS3257 GTT Communications Inc.
• AS3491 PCCW Global (HK) Ltd.
• AS701 Verizon Business
• AS6461 Zayo Bandwidth
• AS7018 AT&T Enterprises, LLC
• AS25956 Logix

Adjacent networks

• AS174 Cogent Communications, LLC
• AS3356 Level 3 Parent, LLC
• AS1299 Arelion Sweden AB
• AS3257 GTT Communications Inc.
• AS3491 PCCW Global (HK) Ltd.
• AS701 Verizon Business
• AS6461 Zayo Bandwidth
• AS7018 AT&T Enterprises, LLC
• AS25956 Logix

Routing security

• RPKI: 8 valid, 0 invalid and 8 not-found announcements; 7 ROAs.
• ASPA: none published.
• IRR: 75% of announcements registered; 17 route objects.
• Listed in as-sets: AS-GTTCUST, AS-JARMTELCO, AS-LOGIXFIBER, AS1299:AS-TWELVE99-EU-V4, AS1299:AS-TWELVE99-EU-V6, AS1299:AS-TWELVE99-NA-V4, AS1299:AS-TWELVE99-NA-V6, AS58453:AS-ASIAASCUST, AS58453:AS-ASIAASCUST, AS58453:AS-ASIATEST, AS58453:AS-ASIATEST2, AS8220:AS-COLTUK.