AS20252 — JSIWMC

AS20252 announces 4 IPv4 prefixes covering 98,816 addresses and 0 IPv6 prefixes.

About this network

JSIWMC is the autonomous system for Weill Cornell Medicine, the medical school of Cornell University.

What it's used for

• The address space carries institutional infrastructure for a major medical research and education center, with netnames including JSIWMC, CUMC, and WCMCQ-NET (Weill Cornell Medical College in Qatar).
• The AS announces 98,816 IPv4 addresses across 4 prefixes while maintaining only 5 observed neighbours, a ratio that indicates an internal corporate estate with site-by-site segmentation rather than a transit or access network.

Notable

• Registrants for the two largest prefixes (157.139.0.0/16 and 140.251.0.0/17) align with the announcer, identified as Joan and Sanford I. Weill Medical College and Graduate School of Medical Sciences of Cornell University.
• The inventory includes a /24 prefix (38.146.193.0/24) registered to Cogent Communications, LLC, and another /24 (207.162.253.0/24) registered to Weill Cornell Medical College in Qatar, indicating a mix of owned and potentially leased or affiliated space.
• The address inventory is dominated by two large blocks (a /16 and a /17) with two smaller /24 allocations, reflecting a consolidated internal network with specific sub-allocations for distinct sites or functions.

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

Announced prefixes

• 38.146.193.0/24
• 140.251.0.0/17
• 157.139.0.0/16
• 207.162.253.0/24

Upstream networks

• AS46887 Crown Castle Fiber LLC
• AS174 Cogent Communications, LLC
• AS12271 Charter Communications Inc
• AS3754 NYSERNet

Adjacent networks

• AS46887 Crown Castle Fiber LLC
• AS174 Cogent Communications, LLC
• AS12271 Charter Communications Inc
• AS3754 NYSERNet