AS25611 — NSLIJHS - North Shore Long Island Jewish Health System

AS25611 announces 7 IPv4 prefixes covering 2,560 addresses and 0 IPv6 prefixes.

About this network

NSLIJHS is the autonomous system for Northwell Health, a major nonprofit healthcare network in New York.

What it's used for

• The address space carries internal corporate infrastructure, evidenced by netnames such as DANBURY-HOSP and LVLT-NSLIJHS-8-25-157 associated with hospital IT groups.
• The AS announces 2560 IPv4 addresses across 8 prefixes with only 3 observed neighbours, a ratio that indicates a site-by-site internal estate rather than an access or transit network.

Notable

• Registrants align with the announcer, including Danbury Hospital - ITG, North Shore Long Island Jewish Health System, Northwell Health, Inc, and NSLIJ.
• North Shore-Long Island Jewish Health System rebranded as Northwell Health, a name change reflecting the system's mission towards overall wellness.
• The inventory consists of eight distinct IPv4 prefixes, including two /23 blocks for Danbury Hospital and several /24 blocks for various Northwell entities.

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

Announced prefixes

• 8.25.157.0/24
• 8.44.200.0/24
• 9.179.235.0/24
• 69.27.229.0/24
• 69.74.179.0/24
• 69.74.180.0/24
• 170.77.196.0/22

Upstream networks

• AS46887 Crown Castle Fiber LLC
• AS3356 Level 3 Parent, LLC
• AS54004 Cablevision Lightpath LLC

Adjacent networks

• AS46887 Crown Castle Fiber LLC
• AS3356 Level 3 Parent, LLC
• AS54004 Cablevision Lightpath LLC

Routing security

• RPKI: 7 valid, 0 invalid and 3 not-found announcements; 5 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 15 route objects.
• Listed in as-sets: AS-CCF, AS-CCF-TEST, AS-CV, AS-INCAPSULA, AS-INCAPSULA, AS-XO-B, AS16657:AS-CUST, AS19551:AS-IMPERVA, AS6128:AS-CUSTOMERS.