NORTHWESTERN MEMORIAL HOSPITAL

Northwestern Memorial Hospital
Data as of 2026-08-23
GLEIF verified
LEI
54930028ZZZN8PN0OC50
Registered name
NORTHWESTERN MEMORIAL HOSPITAL
Jurisdiction
US-IL
Ultimate parent
NORTHWESTERN MEMORIAL HEALTHCARE
549300SYNDSEG3SY2U05
Cluster stats
Netblocks6 · 66,560 IPv4 addresses
Cluster ID229155449
RegistryBGP
Owner jurisdictionUS-IL
Customersfind customers using this network →
Evidence & provenance ?
Attribution GLEIF legal-entity match
Legal identityLEI 54930028ZZZN8PN0OC50
Shared handles clustered on 10 shared RIR contact/maintainer handles
Registry names 2 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

3 weekly snapshots · JSON
6 0 netblocks since 2026-07-19
2026-07-19 peak 6 2026-08-09

IP Ranges (6)

⬇ export CSV
CIDR Org name Registry Status Confidence
165.20.0.0/16 Northwestern Memorial Hospital ARIN DIRECT ALLOCATION ● high
204.62.116.0/22 Northwestern Memorial Hospital ARIN DIRECT ALLOCATION ● high
204.62.116.0/24 Northwestern Memorial Hospital BGP ANNOUNCED ● high
204.62.117.0/24 Northwestern Memorial Hospital BGP ANNOUNCED ● high
204.62.118.0/24 Northwestern Memorial Hospital BGP ANNOUNCED ● high
204.62.119.0/24 Northwestern Memorial Hospital BGP ANNOUNCED ● high

Domains hosted in this network

what's this?
nm.org

Network trust

what's this?
RPKI hygiene: F how networks compare →
16.7% of checked blocks have valid RPKI ROA coverage (1 of 6)
Possible discrepancies (1)

These blocks are registered to Northwestern Memorial Hospital but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

165.20.0.0/16 /16 authorized for AS6079 — RCN

NIC Handles

AS19247 BROWJ2-ARIN BROWJ2-ARIN BROWJ2-ARIN BROWJ2-ARIN JOHNS4388-ARIN JOHNS4388-ARIN JOHNS4388-ARIN NMH-1 SYSAD36-ARIN