Autonomous system
AS25611 NSLIJHS - North Shore Long Island Jewish Health System
Unclassified ARIN
Summary
Northwell Health
healthcare business internal
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-HOSPandLVLT-NSLIJHS-8-25-157associated 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, andNSLIJ. - 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 2.56K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 7 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS25611- Registry name
- NSLIJHS
- Registrant
- North Shore Long Island Jewish Health System
- Abuse contact
- rnockowitz@northwell.edu
- Registered
- 2002-04-08
- Last changed
- 2012-03-02
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 70% valid · 7 valid, 3 with no ROA
- ROAs
- 5 authorising AS25611
- ASPA
- no ASPA record
- IRR
- 100% registered · 10 of 10 announcements
- Route objects
- 15 naming AS25611
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: 453 networks and 1,846 prefixes, as published 2026-11-11. 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