128.91.0.37
Education
Data retrieved at
Network
ASN
IP Range
Company
University of Pennsylvania
Network
UPENN
Using networksdb.io for network lookups.
Hostname
Not available.
Type
Education
Handle
NET-128-91-0-0-1
Registered
1985-09-18
Last Changed
2021-12-14
View raw RDAP
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v4prefix": "128.91.0.0",
"length": 16
}
],
"endAddress": "128.91.255.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-08-27T12:43:41-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-12-10T11:10:02-05:00"
}
],
"handle": "UNIVE-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UNIVE-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
},
{
"href": "https://whois.arin.net/rest/poc/UNIVE-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"Network Operations Center"
],
"title": "Registration Comments"
}
],
"roles": [
"noc",
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "3401 Walnut Street\nSuite 265C\nPhiladelphia\nPA\n19104-6228\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"University of Pennsylvania"
],
[
"org",
{},
"text",
"University of Pennsylvania"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-215-573-9631"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-03-28T17:15:08-04:00"
},
{
"eventAction": "registration",
"eventDate": "2014-06-17T14:32:26-04:00"
}
],
"handle": "OBRIE72-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/OBRIE72-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
},
{
"href": "https://whois.arin.net/rest/poc/OBRIE72-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"OpenPGP key fingerprint: 820F 0E99 A558 EC55 491C 479D 25BC 640D D73C DEF4"
],
"title": "Registration Comments"
}
],
"roles": [
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "3401 Walnut St\nPhiladelphia\nPA\n19104\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"John O'Brien"
],
[
"n",
{},
"text",
[
"O'Brien",
"John",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-215-898-9818"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-06-12T14:13:48-04:00"
},
{
"eventAction": "registration",
"eventDate": "2002-12-11T11:00:04-05:00"
}
],
"handle": "ISO-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ISO-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
},
{
"href": "https://whois.arin.net/rest/poc/ISO-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"UPENN Information Security Officer"
],
"title": "Registration Comments"
}
],
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "3401 Walnut Street\nRm C226\nPhiladelphia\nPA\n19104-6228\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Information Security Officer"
],
[
"org",
{},
"text",
"University of Pennsylvania"
],
[
"kind",
{},
"text",
"group"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-215-898-2172"
],
[
"tel",
{
"type": [
"work",
"fax"
]
},
"text",
"+1-215-573-2037"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-17T14:16:06-04:00"
},
{
"eventAction": "registration",
"eventDate": "2010-01-05T13:36:22-05:00"
}
],
"handle": "UNIVER-8-Z",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/UNIVER-8-Z",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
},
{
"href": "https://whois.arin.net/rest/org/UNIVER-8-Z",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"University of Pennsylvania"
],
[
"adr",
{
"label": "3401 Walnut Street\r\nSuite 221A\nPhiladelphia\nPA\n19104-6228\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2021-12-14T20:28:40-05:00"
},
{
"eventAction": "registration",
"eventDate": "1985-09-18T00:00:00-04:00"
}
],
"handle": "NET-128-91-0-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/128.91.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
},
{
"href": "https://whois.arin.net/rest/net/NET-128-91-0-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/128.91.0.37"
}
],
"name": "UPENN",
"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/128.91.0.37"
}
],
"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/128.91.0.37"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-128-0-0-0-0",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "128.91.0.0",
"status": [
"active"
],
"type": "DIRECT ALLOCATION"
}
Security
No security threats detected for this IP.
VPN
Proxy
Tor
Hosting
Residential Proxy
Bogon
Abuser
Crawler
RPKI
RPKI Origin Validation
RPKI verifies that an IP prefix is legitimately announced by the authorized Autonomous System (ASN) using Route Origin Authorizations (ROAs).
Valid.
This prefix is correctly authorized by a valid ROA.
VALID
Validated Prefix
128.91.0.0/16
Authorized ASN
AS55
Abuse Contacts
IP Geolocation
Country
United States
City
Philadelphia (📍 19104)
Pennsylvania
Time Zone
America/New_York
Coordinates
39.9597, -75.1995
Continent
North America
European Union
No.
Phone prefix
+1
Currency
US Dollar (USD $)