1. All IP Ranges
  2. 128.0.0.0/8
  3. 128.91.0.0/16
  4. AS55  | 128.91.0.0/16

128.91.0.0/16

AS55  ·  University of Pennsylvania

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Summary

Country United States
Domain upenn.edu
ASN AS55
Registry ARIN
ID UPENN

WHOIS Details

NetHandle:      NET-128-91-0-0-1
OrgID:          UNIVER-8-Z
Parent:         NET-128-0-0-0-0
NetName:        UPENN
NetRange:       128.91.0.0 - 128.91.255.255
NetType:        allocation
RegDate:        1985-09-18
Updated:        2021-12-14
Source:         ARIN


OrgID:          UNIVER-8-Z
OrgName:        University of Pennsylvania
CanAllocate:    
Street:         3401 Walnut Street
Street:         Suite 221A
City:           Philadelphia
State/Prov:     PA
Country:        US
PostalCode:     19104-6228
RegDate:        2010-01-05
Updated:        2022-08-03
OrgAdminHandle: UNIVE-ARIN
OrgTechHandle:  OBRIE72-ARIN
OrgAbuseHandle: ISO-ARIN
OrgNOCHandle:   UNIVE-ARIN
Source:         ARIN


POCHandle:      ISO-ARIN
IsRole:         Y
LastName:       Information Security Officer
FirstName:      
Street:         3401 Walnut Street
Street:         Rm C226
City:           Philadelphia
State/Prov:     PA
Country:        US
PostalCode:     19104-6228
RegDate:        2002-12-11
Updated:        2025-06-02
OfficePhone:    +1-215-898-2172
FaxPhone:       +1-215-573-2037
Mailbox:        security@upenn.edu
Source:         ARIN


POCHandle:      OBRIE72-ARIN
IsRole:         N
LastName:       O'Brien
FirstName:      John
Street:         3401 Walnut St
City:           Philadelphia
State/Prov:     PA
Country:        US
PostalCode:     19104
RegDate:        2014-06-17
Updated:        2025-03-28
OfficePhone:    +1-215-898-9818
Mailbox:        obrienjw@upenn.edu
Source:         ARIN


POCHandle:      UNIVE-ARIN
IsRole:         Y
LastName:       University of Pennsylvania
FirstName:      
Street:         3401 Walnut Street
Street:         Suite 265C
City:           Philadelphia
State/Prov:     PA
Country:        US
PostalCode:     19104-6228
RegDate:        2002-12-10
Updated:        2025-08-27
OfficePhone:    +1-215-573-9631
Mailbox:        noc@isc.upenn.edu
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 128.0.0.0/8

Range ASN Company Num of IPs
128.130.0.0/15 AS679 Technische Universitaet Wien 131,072
128.78.0.0/15 AS5410 Bouygues Telecom SA 131,072
128.178.0.0/15 AS559 Ecublens Camp Net 131,072
128.142.0.0/16 AS513 CERN LCG network 65,536
128.108.0.0/16 AS45090 Tencent Cloud Computing (Beijing) Co., Ltd 65,536
128.134.0.0/16 AS4766 Korea Telecom 65,536
128.210.0.0/16 AS397511 Purdue University 65,536
128.60.0.0/16 AS48 Navy Network Information Center (NNIC) 65,536
128.163.0.0/16 AS23162 University of Kentucky 65,536
128.115.0.0/16 AS45 Lawrence Livermore National Laboratory 65,536
128.15.0.0/16 AS45 Lawrence Livermore National Laboratory 65,536
128.211.0.0/16 AS397501 Purdue University 65,536
128.211.0.0/16 AS397511 Purdue University 65,536
128.38.0.0/16 AS37 Navy Network Information Center (NNIC) 65,536
128.205.0.0/16 AS3685 State University of New York at Buffalo 65,536
128.93.0.0/16 AS2200 Institut National de Recherche en Informatique et Automatique 65,536
128.49.0.0/16 AS22 Navy Network Information Center (NNIC) 65,536
128.98.0.0/16 AS24775 QinetiQ TIM 65,536
128.235.0.0/16 AS4246 New Jersey Institute of Technology 65,536
128.118.0.0/16 AS3999 The Pennsylvania State University 65,536
128.18.0.0/16 AS264 SRI International 65,536
128.202.0.0/16 AS391 Air Force Systems Networking 65,536
128.249.0.0/16 AS302 Baylor College of Medicine 65,536
128.236.0.0/16 AS391 Air Force Systems Networking 65,536
128.43.0.0/16 AS3766 Shared Services Canada 65,536
128.29.0.0/16 AS35 The MITRE Corporation 65,536
128.231.0.0/16 AS3527 National Institutes of Health 65,536
128.190.0.0/16 AS367 Headquarters, USAISC 65,536
128.192.0.0/16 AS36441 University of Georgia 65,536
128.44.0.0/16 AS367 Headquarters, USAISC 65,536
128.255.0.0/16 AS3676 University of Iowa 65,536
128.39.0.0/16 AS224 UNINETT backbone network 65,536
128.6.0.0/16 AS46 Rutgers, The State University 65,536
128.143.0.0/16 AS225 University of Virginia 65,536
128.233.0.0/16 AS22950 University of Saskatchewan 65,536
128.100.0.0/16 AS239 University of Toronto 65,536
128.170.0.0/16 AS243 L3Harris Technologies, Inc. 65,536
128.234.0.0/16 AS25019 Saudi Telecom Company JSC 65,536
128.32.0.0/16 AS25 University of California at Berkeley 65,536
128.28.0.0/16 AS2514 NTT PC Communications,Inc. 65,536
128.36.0.0/16 AS29 Yale University 65,536
128.53.0.0/16 AS2514 NTT PC Communications,Inc. 65,536
128.47.0.0/16 AS252 Headquarters, USAISC 65,536
128.186.0.0/16 AS2553 Florida State University 65,536
128.252.0.0/16 AS2552 Washington University 65,536
128.253.0.0/16 AS26 Cornell University 65,536
128.84.0.0/16 AS26 Cornell University 65,536
128.228.0.0/16 AS31822 City University of New York 65,536
128.223.0.0/16 AS3582 University of Oregon 65,536
128.34.0.0/16 AS22 Navy Network Information Center (NNIC) 65,536

Hosted domains

There are 46 domain names hosted across 27 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
128.91.58.202 usa250civics.org 6
128.91.204.164 chronicrenalinsufficiencycohortstudy.org 6
128.91.252.43 languagelog.com 4
128.91.205.29 upennprc.org 4
128.91.204.214 cear-itmat-upenn.org 3
128.91.45.163 ashmanskas.net 2
128.91.90.85 wharton-asian.com 2
128.91.205.39 phantomstudy.org 2
128.91.252.143 language-archives.org 1
128.91.136.144 wxpn.biz 1
128.91.19.194 ophanim.org 1
128.91.89.221 whenthingsgowrong.com 1
128.91.204.194 scap-t.org 1
128.91.15.225 caninebpi.com 1
128.91.205.96 w2h.us 1
128.91.58.198 viscomlab.com 1
128.91.116.217 lodriguss.net 1
128.91.58.142 friendlyisland.info 1
128.91.35.13 mypenndentist.com 1
128.91.58.137 matthewbrookodonnell.com 1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity
Read more

Pingable IPs

5,354 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
128.91.53.160 AS55 University of Pennsylvania 3.43ms from New York City, US
128.91.199.95 AS55 University of Pennsylvania 3.47ms from New York City, US
128.91.70.113 AS55 University of Pennsylvania 3.44ms from New York City, US
128.91.193.1 AS55 University of Pennsylvania 3.63ms from New York City, US
128.91.161.96 AS55 University of Pennsylvania 4.62ms from New York City, US
128.91.135.2 AS55 University of Pennsylvania 3.40ms from New York City, US
128.91.15.230 AS55 University of Pennsylvania 3.69ms from New York City, US
128.91.31.126 AS55 University of Pennsylvania 3.46ms from New York City, US
128.91.148.92 AS55 University of Pennsylvania 3.27ms from New York City, US
128.91.125.148 AS55 University of Pennsylvania 3.61ms from Secaucus, US
128.91.152.3 AS55 University of Pennsylvania 3.77ms from New York City, US
128.91.140.194 AS55 University of Pennsylvania 3.66ms from New York City, US
128.91.205.97 AS55 University of Pennsylvania 5.78ms from New York City, US
128.91.67.62 AS55 University of Pennsylvania 3.20ms from New York City, US
128.91.85.73 AS55 University of Pennsylvania 3.38ms from New York City, US
128.91.59.168 AS55 University of Pennsylvania 3.50ms from New York City, US
128.91.10.196 AS55 University of Pennsylvania 3.58ms from New York City, US
128.91.147.15 AS55 University of Pennsylvania 3.24ms from New York City, US
128.91.87.42 AS55 University of Pennsylvania 3.89ms from New York City, US
128.91.4.12 AS55 University of Pennsylvania 3.97ms from New York City, US
128.91.36.32 AS55 University of Pennsylvania 3.76ms from New York City, US
128.91.11.220 AS55 University of Pennsylvania 3.54ms from New York City, US
128.91.206.146 AS55 University of Pennsylvania 3.40ms from New York City, US
128.91.139.62 AS55 University of Pennsylvania 3.38ms from New York City, US
128.91.3.5 AS55 University of Pennsylvania 3.38ms from New York City, US

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address ASN Details
213.197.38.112 AS1136 KPN B.V. 1.24ms from Amsterdam, NL
169.155.155.176 AS31898 Oracle Corporation 0.39ms from Ashburn, US
20.124.104.32 AS8075 Microsoft Corporation 0.40ms from Ashburn, US
23.43.247.192 AS16625 Akamai Technologies, Inc. 0.72ms from Atlanta, US
1.123.75.96 AS1221 Telstra Limited 7.38ms from Brisbane, AU
13.58.205.64 AS16509 Amazon.com, Inc. 0.16ms from Columbus, US
3.132.136.224 AS16509 Amazon.com, Inc. 0.17ms from Columbus, US
154.7.146.48 AS19740 Sudjam, LLC 0.18ms from Dallas, US
91.89.226.224 AS3209 Vodafone GmbH 10.53ms from Frankfurt am Main, DE
47.118.215.0 AS37963 Hangzhou Alibaba Advertising Co.,Ltd. 4.64ms from Hangzhou, CN
27.78.120.80 AS7552 Viettel Group 1.90ms from Ho Chi Minh City, VN
124.63.54.64 AS17858 LG POWERCOMM 4.91ms from Incheon, KR
89.240.142.224 AS13285 TalkTalk Communications Limited 5.88ms from London, GB
176.112.224.48 AS50911 LLC "Electron-Telecom" 1.25ms from Moscow, RU
85.71.82.32 AS5610 O2 Czech Republic, a.s. 1.49ms from Prague, CZ
122.5.193.0 AS4134 CHINANET-BACKBONE 13.26ms from Qingdao, CN
14.66.160.80 AS4766 Korea Telecom 2.59ms from Seoul, KR
39.115.192.224 AS9318 SK Broadband Co Ltd 7.02ms from Seoul, KR
183.185.127.240 AS4837 CHINA UNICOM China169 Backbone 3.18ms from Taiyuan, CN
175.168.96.16 AS4837 CHINA UNICOM China169 Backbone 8.01ms from Tieling, CN
160.231.133.16 AS41935 DASSAULT SYSTEMES SE 1.26ms from Tokyo, JP
36.100.133.16 AS140061 Qinghai Telecom 2.38ms from Xining, CN
77.163.75.240 AS1136 KPN B.V. 1.18ms from Amsterdam, NL
20.46.228.96 AS8075 Microsoft Corporation 0.18ms from Des Moines, US
194.186.225.240 AS3216 PJSC Vimpelcom 0.39ms from Khabarovsk, RU

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

$
traceroute -a -n -q1 -f3 128.91.233.7
traceroute to 128.91.233.7 (128.91.233.7): 64 hops max, 52 byte packets
3 [AS3356] 4.16.91.150 46.037 ms
4 *
5 *
6 *
7 *
8 [AS55] 128.91.233.7 47.36 ms
Measurement taken from IPinfo ProbeNet in Casper, US
On

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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