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:        [email protected]
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:        [email protected]
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:        [email protected]
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 128.0.0.0/8

Range ASN Company Num of IPs
128.178.0.0/15 AS559 Ecublens Camp Net 131,072
128.130.0.0/15 AS679 Technische Universitaet Wien 131,072
128.78.0.0/15 AS5410 Bouygues Telecom SA 131,072
128.113.0.0/16 AS91 Rensselaer Polytechnic Institute 65,536
128.132.0.0/16 AS668 Air Force Systems Networking 65,536
128.25.0.0/16 AS749 DoD Network Information Center 65,536
128.198.0.0/16 AS396425 University of Colorado, Colorado Springs 65,536
128.133.0.0/16 AS749 Air Force Systems Networking 65,536
128.213.0.0/16 AS91 Rensselaer Polytechnic Institute 65,536
128.177.0.0/16 AS6461 Zayo Bandwidth 65,536
128.114.0.0/16 AS5739 University of California, Santa Cruz 65,536
128.97.0.0/16 AS52 University of California, Los Angeles 65,536
128.176.0.0/16 AS680 Universitaet Muenster, CIT 65,536
128.165.0.0/16 AS68 Los Alamos National Laboratory 65,536
128.189.0.0/16 AS271 BCNET 65,536
128.14.0.0/16 AS21859 Zenlayer Inc 65,536
128.180.0.0/16 AS6522 Lehigh University 65,536
128.120.0.0/16 AS6192 University of California, Davis 65,536
128.80.0.0/16 AS749 DoD Network Information Center 65,536
128.42.0.0/16 AS8 Rice University 65,536
128.60.0.0/16 AS48 Navy Network Information Center (NNIC) 65,536
128.44.0.0/16 AS367 Headquarters, USAISC 65,536
128.139.0.0/16 AS378 IUCC - Israel InterUniversity Computation Center 65,536
128.211.0.0/16 AS397501 Purdue University 65,536
128.211.0.0/16 AS397511 Purdue University 65,536
128.118.0.0/16 AS3999 The Pennsylvania State University 65,536
128.49.0.0/16 AS22 Navy Network Information Center (NNIC) 65,536
128.123.0.0/16 AS40246 New Mexico State University 65,536
128.7.0.0/16 AS680 Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. 65,536
128.56.0.0/16 AS749 Navy Network Information Center (NNIC) 65,536
128.34.0.0/16 AS22 Navy Network Information Center (NNIC) 65,536
128.93.0.0/16 AS2200 Institut National de Recherche en Informatique et Automatique 65,536
128.206.0.0/16 AS26934 University of Missouri-Columbia 65,536
128.38.0.0/16 AS37 Navy Network Information Center (NNIC) 65,536
128.200.0.0/16 AS299 University of California, Irvine 65,536
128.195.0.0/16 AS299 University of California, Irvine 65,536
128.156.0.0/16 AS297 National Aeronautics and Space Administration 65,536
128.171.0.0/16 AS6360 University of Hawaii 65,536
128.187.0.0/16 AS6510 Brigham Young University 65,536
128.227.0.0/16 AS6356 University of Florida 65,536
128.29.0.0/16 AS35 The MITRE Corporation 65,536
128.255.0.0/16 AS3676 University of Iowa 65,536
128.205.0.0/16 AS3685 State University of New York at Buffalo 65,536
128.192.0.0/16 AS36441 University of Georgia 65,536
128.190.0.0/16 AS367 Headquarters, USAISC 65,536
128.163.0.0/16 AS396261 University of Kentucky 65,536
128.62.0.0/16 AS18 University of Texas at Austin 65,536
128.27.0.0/16 AS17511 OPTAGE Inc. 65,536
128.22.0.0/16 AS17511 OPTAGE Inc. 65,536

Hosted domains

There are 52 domain names hosted across 28 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
128.91.204.164 cricdataview.org 6
128.91.58.202 mammogram-choice.org 6
128.91.58.234 casbsxchange.com 5
128.91.252.43 pluralofvinyls.com 4
128.91.205.29 phillycancercollab.org 4
128.91.204.214 steptogetherstudy.org 3
128.91.45.163 ashmanskas.net 2
128.91.205.39 phantomstudy.org 2
128.91.90.85 wharton.edu 2
128.91.204.194 scap-t.org 1
128.91.89.221 whenthingsgowrong.com 1
128.91.136.174 wxpn.biz 1
128.91.136.144 wxpn.biz 1
128.91.116.217 lodriguss.net 1
128.91.88.109 whartonwm.com 1
128.91.15.225 caninebpi.com 1
128.91.58.137 matthewbrookodonnell.com 1
128.91.35.13 mypenndentist.com 1
128.91.228.177 lexhub.org 1
128.91.205.96 w2h.us 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

5,407 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
128.91.4.12 AS55 University of Pennsylvania 3.93ms from New York City, US
128.91.3.5 AS55 University of Pennsylvania 3.36ms from New York City, US
128.91.1.38 AS55 University of Pennsylvania 4.50ms from Secaucus, US
128.91.12.41 AS55 University of Pennsylvania 3.49ms from New York City, US
128.91.6.86 AS55 University of Pennsylvania 3.31ms from New York City, US
128.91.0.33 AS55 University of Pennsylvania 3.54ms from New York City, US
128.91.5.145 AS55 University of Pennsylvania 2.61ms from New York City, US
128.91.8.3 AS55 University of Pennsylvania 3.90ms from New York City, US
128.91.11.101 AS55 University of Pennsylvania 3.47ms from New York City, US
128.91.7.203 AS55 University of Pennsylvania 3.35ms from New York City, US
128.91.10.253 AS55 University of Pennsylvania 3.63ms from New York City, US
128.91.2.129 AS55 University of Pennsylvania 3.29ms from New York City, US
128.91.135.2 AS55 University of Pennsylvania 3.57ms from New York City, US
128.91.16.171 AS55 University of Pennsylvania 3.32ms from New York City, US
128.91.108.12 AS55 University of Pennsylvania 3.49ms from New York City, US
128.91.71.28 AS55 University of Pennsylvania 3.22ms from New York City, US
128.91.77.182 AS55 University of Pennsylvania 3.35ms from New York City, US
128.91.217.134 AS55 University of Pennsylvania 3.24ms from New York City, US
128.91.42.47 AS55 University of Pennsylvania 3.40ms from New York City, US
128.91.60.65 AS55 University of Pennsylvania 3.79ms from New York City, US
128.91.111.80 AS55 University of Pennsylvania 3.57ms from New York City, US
128.91.229.238 AS55 University of Pennsylvania 3.66ms from New York City, US
128.91.101.44 AS55 University of Pennsylvania 3.78ms from New York City, US
128.91.88.1 AS55 University of Pennsylvania 4.09ms from New York City, US
128.91.226.1 AS55 University of Pennsylvania 4.01ms from Secaucus, 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
34.161.3.32 AS396982 Google LLC 4.06ms from Atlanta, US
171.103.91.0 AS7470 TRUE INTERNET Co.,Ltd. 2.23ms from Bangkok, TH
3.21.193.128 AS16509 Amazon.com, Inc. 0.17ms from Columbus, US
116.98.186.240 AS7552 Viettel Group 15.39ms from Ho Chi Minh City, VN
59.103.123.0 AS9541 Cyber Internet Services (Pvt) Ltd. 5.22ms from Islamabad, PK
92.31.242.0 AS13285 TalkTalk Communications Limited 3.54ms from London, GB
190.134.213.48 AS6057 Administracion Nacional de Telecomunicaciones 1.83ms from Montevideo, UY
112.26.59.208 AS9808 China Mobile Communications Group Co., Ltd. 4.56ms from Nanjing, CN
79.56.106.224 AS3269 Telecom Italia S.p.A. 14.62ms from Naples, IT
126.125.63.96 AS17676 SoftBank Corp. 10.15ms from Osaka, JP
193.28.155.64 AS43842 Malam Team Ltd. 3.13ms from Petaẖ Tiqva, IL
155.212.20.208 AS3226 OOO "NI" 7.90ms from Yekaterinburg, RU
38.101.250.96 AS174 Cogent Communications, LLC 0.29ms from Atlanta, US
223.149.169.144 AS4134 CHINANET-BACKBONE 7.03ms from Changsha, CN
99.117.138.16 AS7018 AT&T Enterprises, LLC 2.95ms from Chicago, US
186.250.44.0 AS262805 REDE MINAS TELECOM LTDA 7.15ms from Fortaleza, BR
130.194.21.0 AS56132 Monash University, 2.76ms from Melbourne, AU
133.17.92.48 AS2907 Research Organization of Information and Systems, National Institute of Informatics 12.48ms from Osaka, JP
184.171.11.224 AS3582 University of Oregon 3.23ms from Portland, US
45.39.221.240 AS212238 Datacamp Limited 0.10ms from Tokyo, JP
222.146.28.64 AS4713 NTT DOCOMO BUSINESS,Inc. 1.56ms from Tokyo, JP
119.99.237.0 AS4134 CHINANET-BACKBONE 3.69ms from Wuhan, CN
182.119.177.32 AS4837 CHINA UNICOM China169 Backbone 1.03ms from Zhengzhou, CN
86.86.198.80 AS1136 KPN B.V. 1.06ms from Amsterdam, NL
52.32.215.16 AS16509 Amazon.com, Inc. 0.17ms from Boardman, US

Traceroute

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

$
traceroute -a -n -q1 -f2 128.91.45.61
traceroute to 128.91.45.61 (128.91.45.61): 64 hops max, 52 byte packets
2 [AS3356] 4.1.40.153 4.128 ms
3 *
4 [AS3356] 4.16.91.150 72.659 ms
5 *
6 *
7 *
8 *
9 [AS55] 128.91.45.61 73.739 ms
Measurement taken from IPinfo ProbeNet in Bend, 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.

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