Organization
Northwestern Memorial Hospital
NMH
Location
Chicago (Streeterville)
Illinois, United States (US)
Hostname
—
Geolocation
United States (US) United States
- Country
- United States (US)
- Region
- Illinois
- City
- Chicago (Streeterville)
- Continent
- North America
- Coordinates
- 41.8937, -87.621 View on map ↗
Network Information
IP Range 165.20.0.0 – 165.20.255.255 CIDR 165.20.0.0/16 Network Name NMH Handle NET-165-20-0-0-1 Type DIRECT ALLOCATION Parent Network NET-165-0-0-0-0 Organization Northwestern Memorial Hospital Organization ID NMH-1 Address 259 East Erie Street, Chicago, IL, 60611, United States Country United States (US) Registry ARIN Registered On Mar 31, 1993 Last Updated Dec 15, 2021 Status
active
ASN & Routing
Origin AS AS6079 AS Name RCN-AS - RCN, US Announced Prefix 165.20.151.0/24 AS Registry ARIN Prefix Country United States (US) Allocated 1993-03-31 RPKI Origin Valid (covered by a matching ROA)
Reverse DNS
No PTR record is published for this address.
Abuse Contact
Raw RDAP Response
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v4prefix": "165.20.0.0",
"length": 16
}
],
"endAddress": "165.20.255.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-18T20:59:58-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-03-19T10:59:26-04:00"
}
],
"handle": "BROWJ2-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/BROWJ2-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
},
{
"href": "https://whois.arin.net/rest/poc/BROWJ2-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse",
"administrative",
"technical",
"dns"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "541 North Fairbanks Court\nChicago\nIL\n60611\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"John Brow"
],
[
"n",
{},
"text",
[
"Brow",
"John",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-312-695-2244"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-12T14:27:22-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-03-19T11:08:29-04:00"
}
],
"handle": "JOHNS4388-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/JOHNS4388-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
},
{
"href": "https://whois.arin.net/rest/poc/JOHNS4388-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"technical",
"dns",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "541 North Fairbanks Court\nChicago\nIL\n60611\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Terrance Johnson"
],
[
"n",
{},
"text",
[
"Johnson",
"Terrance",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-312-926-5875"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-03-19T11:26:49-04:00"
},
{
"eventAction": "registration",
"eventDate": "1993-03-31T00:00:00-05:00"
}
],
"handle": "NMH-1",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/NMH-1",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
},
{
"href": "https://whois.arin.net/rest/org/NMH-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Northwestern Memorial Hospital"
],
[
"adr",
{
"label": "259 East Erie Street\nChicago\nIL\n60611\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2015-06-29T10:22:32-04:00"
},
{
"eventAction": "registration",
"eventDate": "2006-10-11T09:00:06-04:00"
}
],
"handle": "SYSAD36-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/SYSAD36-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
},
{
"href": "https://whois.arin.net/rest/poc/SYSAD36-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"ARIN has attempted to validate the data for this POC, but has received no response from the POC since 2016-06-28"
],
"title": "Unvalidated POC"
}
],
"roles": [
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "259 East Erie Street\nChicago\nIL\n60611\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"sysadmin"
],
[
"org",
{},
"text",
"Northwestern Memorial Hospital"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-312-926-4357"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2021-12-14T20:28:48-05:00"
},
{
"eventAction": "registration",
"eventDate": "1993-03-31T00:00:00-05:00"
}
],
"handle": "NET-165-20-0-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/165.20.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
},
{
"href": "https://whois.arin.net/rest/net/NET-165-20-0-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"name": "NMH",
"notices": [
{
"description": [
"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/tou/",
"rel": "terms-of-service",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"title": "Terms of Service"
},
{
"description": [
"If you see inaccuracies in the results, please visit: "
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
"rel": "inaccuracy-report",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/165.20.151.0"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-165-0-0-0-0",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "165.20.0.0",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
} Contact details of private individuals are redacted.