AS40016 — MESIROW

AS40016 announces 2 IPv4 prefixes covering 512 addresses and 0 IPv6 prefixes.

About this network

The AS handle MESIROW is held by Mesirow Financial Holdings, Inc.

What it's used for

• The address space carries internal corporate infrastructure, evidenced by reverse DNS entries apps.mesirowfinancial.com and appsdr.mesirowfinancial.com and netnames MESIROW and CERF-MESIROW-A.
• The AS announces 512 IPv4 addresses across 2 prefixes with 3 observed neighbours, indicating a small-scale internal network rather than a transit or access provider.
• Traffic from this AS consists of office workers and internal application endpoints for a privately held financial services firm based in Chicago, Illinois.

Notable

• Registrants align with the announcer, listing Mesirow Financial for both prefixes, with one prefix also referencing ATand T Enhanced Network Services.
• The address inventory is compact, consisting of two /24 blocks, which is typical for a single corporate entity managing its own IP space.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 204.153.74.0/24
• 207.252.173.0/24

Upstream networks

• AS23352 DEFT.COM
• AS174 Cogent Communications, LLC
• AS3356 Level 3 Parent, LLC

Adjacent networks

• AS23352 DEFT.COM
• AS174 Cogent Communications, LLC
• AS3356 Level 3 Parent, LLC

Routing security

• RPKI: 0 valid, 0 invalid and 2 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 0 route objects.
• Listed in as-sets: AS-SUMMITHQ-CUSTOMERS, AS-SUMMITHQ-TESTING, AS-WINDSTREAM-CUST, AS-XO-B.