Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS36319

Announcement observedARIN

NorthShore University HealthSystem · ENWHC

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active10/2/2026, 22:51:58Snapshot expired

View network topology RDAP registration

ASN: AS36319
Registration country: United States
Name: NorthShore University HealthSystem
Abbreviation: ENWHC
Registration date: 11/28/2005, 19:34:21
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
198.251.16.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
198.251.16.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
198.251.17.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
198.251.18.0/23BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
198.251.18.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
198.251.19.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
204.26.16.0/20BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
204.26.27.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
204.26.28.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
204.26.29.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid
204.26.30.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/18/2026, 16:00:00	10/20/2026, 08:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: NorthShore University HealthSystem
RIR: ARIN
Registration country: United States
Registration date: 11/28/2005, 19:34:21
Abuse contact: msinisi@northshore.org

Snapshot trend

10/2/2026, 22:51:5811 v40 v63 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · iana-rdap-asn-bootstrap · rir-rdap-asn