1. All IP Ranges
  2. 128.0.0.0/8
  3. 128.4.0.0/16
  4. AS2  | 128.4.0.0/16

128.4.0.0/16

AS2  ·  University of Delaware

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Summary

Country United States
Domain udel.edu
ASN AS2
Registry ARIN
ID UDEL-DCN

WHOIS Details

NetHandle:      NET-128-4-0-0-1
OrgID:          UNIVER-19-Z
Parent:         NET-128-0-0-0-0
NetName:        UDEL-DCN
NetRange:       128.4.0.0 - 128.4.255.255
NetType:        allocation
RegDate:        1991-01-10
Updated:        2024-08-15
TechHandle:     DAVIS2708-ARIN
Source:         ARIN


OrgID:          UNIVER-19-Z
OrgName:        University of Delaware
CanAllocate:    
Street:         Information Technologies
Street:         192 South Chapel Street
City:           Newark
State/Prov:     DE
Country:        US
PostalCode:     19716
RegDate:        2008-03-18
Updated:        2024-08-15
OrgAdminHandle: DAVIS2708-ARIN
OrgTechHandle:  NSS13-ARIN
OrgAbuseHandle: UDELN-ARIN
OrgNOCHandle:   UDELN-ARIN
OrgRoutingHandle:   NSS13-ARIN
OrgDNSHandle:   UDELN-ARIN
Source:         ARIN


POCHandle:      NSS13-ARIN
IsRole:         Y
LastName:       Network and Systems Services
FirstName:      
Street:         192 South Chapel Street
City:           Newark
State/Prov:     DE
Country:        US
PostalCode:     19716
RegDate:        2010-06-15
Updated:        2025-06-27
OfficePhone:    +1-302-831-6000
Mailbox:        [email protected]
Mailbox:        [email protected]
Source:         ARIN


POCHandle:      DAVIS2708-ARIN
IsRole:         N
LastName:       DAvis
FirstName:      Michael
Street:         192 S. Chapel St
City:           Newark
State/Prov:     DE
Country:        US
PostalCode:     19716
RegDate:        2023-09-21
Updated:        2025-09-19
OfficePhone:    +1-302-831-6006
Mailbox:        [email protected]
Source:         ARIN


POCHandle:      UDELN-ARIN
IsRole:         Y
LastName:       UDel NOC
FirstName:      
Street:         Information Technologies
City:           Newark
State/Prov:     DE
Country:        US
PostalCode:     19716
RegDate:        2009-08-07
Updated:        2026-01-10
OfficePhone:    +1-302-831-6000
FaxPhone:       +1-302-831-3717
Mailbox:        [email protected]
Source:         ARIN

Nearby Ranges

BGP prefixes that overlap with 128.0.0.0/8

Range ASN Company Num of IPs
128.78.0.0/15 AS5410 Bouygues Telecom SA 131,072
128.178.0.0/15 AS559 Ecublens Camp Net 131,072
128.130.0.0/15 AS679 Technische Universitaet Wien 131,072
128.42.0.0/16 AS8 Rice University 65,536
128.205.0.0/16 AS3685 State University of New York at Buffalo 65,536
128.56.0.0/16 AS749 Navy Network Information Center (NNIC) 65,536
128.95.0.0/16 AS73 University of Washington 65,536
128.184.0.0/16 AS7645 Deakin University 65,536
128.229.0.0/16 AS7281 Booz Allen Hamilton Inc. 65,536
128.54.0.0/16 AS7377 University of California, San Diego 65,536
128.227.0.0/16 AS6356 University of Florida 65,536
128.25.0.0/16 AS749 DoD Network Information Center 65,536
128.208.0.0/16 AS73 University of Washington 65,536
128.58.0.0/16 AS72 Schlumberger Omnes 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
128.133.0.0/16 AS749 Air Force Systems Networking 65,536
128.97.0.0/16 AS52 University of California, Los Angeles 65,536
128.171.0.0/16 AS6360 University of Hawaii 65,536
128.141.0.0/16 AS513 CERN Campus dynamic addresses 65,536
128.226.0.0/16 AS4190 Binghamton University 65,536
128.104.0.0/16 AS59 University of Wisconsin Madison 65,536
128.44.0.0/16 AS5972 Headquarters, USAISC 65,536
128.248.0.0/16 AS6200 University of Illinois Chicago 65,536
128.7.0.0/16 AS680 Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. 65,536
128.187.0.0/16 AS6510 Brigham Young University 65,536
128.180.0.0/16 AS6522 Lehigh University 65,536
128.132.0.0/16 AS668 Air Force Systems Networking 65,536
128.108.0.0/16 AS45090 Tencent Cloud Computing (Beijing) Co., Ltd 65,536
128.15.0.0/16 AS45 Lawrence Livermore National Laboratory 65,536
128.80.0.0/16 AS749 DoD Network Information Center 65,536
128.134.0.0/16 AS4766 Korea Telecom 65,536
128.19.0.0/16 AS27064 DoD Network Information Center 65,536
128.14.0.0/16 AS21859 Zenlayer Inc 65,536
128.37.0.0/16 AS27064 Headquarters, USAISC 65,536
128.29.0.0/16 AS35 The MITRE Corporation 65,536
128.44.0.0/16 AS367 Headquarters, USAISC 65,536
128.223.0.0/16 AS3582 University of Oregon 65,536
128.190.0.0/16 AS367 Headquarters, USAISC 65,536
128.192.0.0/16 AS36441 University of Georgia 65,536
128.124.0.0/16 AS21497 PrJSC VF UKRAINE 65,536
128.139.0.0/16 AS378 IUCC - Israel InterUniversity Computation Center 65,536
128.219.0.0/16 AS50 Oak Ridge National Laboratory 65,536
128.220.0.0/16 AS5723 Johns Hopkins University 65,536
128.163.0.0/16 AS396261 University of Kentucky 65,536
128.118.0.0/16 AS3999 The Pennsylvania State University 65,536
128.105.0.0/16 AS59 University of Wisconsin Madison 65,536
128.123.0.0/16 AS40246 New Mexico State University 65,536
128.142.0.0/16 AS513 CERN LCG network 65,536
128.115.0.0/16 AS45 Lawrence Livermore National Laboratory 65,536

Hosted domains

There are 12 domain names hosted across 5 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
128.4.31.8 cosmic-lab.net 8
128.4.20.226 huoenter.com 1
128.4.31.86 darptolus.com 1
128.4.31.87 sensifylab.org 1
128.4.31.222 civl.dev 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

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

IP Address ASN Details
128.4.33.3 AS2 University of Delaware 4.38ms from Reston, US
128.4.41.4 AS2 University of Delaware 4.66ms from Reston, 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
96.172.42.128 AS53297 Comcast Cable Communications, LLC 0.05ms from Chicago, US
65.102.86.80 AS209 CenturyLink Communications, LLC 4.14ms from Denver, US
40.122.202.64 AS8075 Microsoft Corporation 0.21ms from Des Moines, US
54.229.150.0 AS16509 Amazon.com, Inc. 0.19ms from Dublin, IE
34.103.40.16 AS396982 Google LLC 1.27ms from Hamina, FI
61.105.56.16 AS9318 SK Broadband Co Ltd 7.20ms from Incheon, KR
81.137.206.144 AS2856 British Telecommunications PLC 2.78ms from London, GB
65.92.29.32 AS577 Bell Canada 4.51ms from Montreal, CA
219.104.116.64 AS2527 Sony Network Communications Inc. 8.34ms from Osaka, JP
8.129.132.144 AS37963 Hangzhou Alibaba Advertising Co.,Ltd. 1.64ms from Shenzhen, CN
78.130.169.16 AS9070 Cooolbox AD 2.60ms from Sofia, BG
64.229.219.176 AS577 Bell Canada 7.23ms from Toronto, CA
91.244.228.0 AS204401 AFIBER B.V. 0.25ms from Amsterdam, NL
31.148.128.16 AS44546 ALFA TELECOM s.r.o. 0.52ms from Amsterdam, NL
76.97.157.208 AS7922 Comcast Cable Communications, LLC 3.97ms from Atlanta, US
95.69.110.144 AS42863 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A. 12.94ms from Braga, PT
75.81.102.80 AS11427 Charter Communications Inc 14.65ms from Dallas, US
76.25.35.32 AS7922 Comcast Cable Communications, LLC 3.78ms from Denver, US
174.138.102.144 AS14061 DigitalOcean, LLC 0.10ms from Frankfurt am Main, DE
8.53.174.128 AS3356 Level 3 Parent, LLC 1.83ms from Las Vegas, US
62.43.157.176 AS6739 VODAFONE ONO, S.A. 4.54ms from Madrid, ES
109.63.119.32 AS51375 STC BAHRAIN B.S.C CLOSED 7.81ms from Manama, BH
126.4.212.176 AS17676 SoftBank Corp. 2.76ms from Osaka, JP
76.147.209.96 AS7922 Comcast Cable Communications, LLC 3.67ms from Seattle, US
222.73.233.80 AS4811 China Telecom (Group) 3.48ms from Shanghai, CN

Traceroute

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

$
traceroute -a -n -q1 -m5 128.4.217.124
traceroute to 128.4.217.124 (128.4.217.124): 5 hops max, 52 byte packets
1 [AS15169] 142.251.52.186 174.012 ms
2 [] 199.109.102.9 174.215 ms
3 *
4 *
5 *
Measurement taken from IPinfo ProbeNet in Chang-hua, TW
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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