1. All IP Ranges
  2. 128.0.0.0/8
  3. 128.138.0.0/16
  4. AS104  | 128.138.0.0/16

128.138.0.0/16

AS104  ·  University of Colorado at Boulder

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Summary

Country United States
Domain cu.edu
ASN AS104
Registry ARIN
ID COLORADO

WHOIS Details

NetHandle:      NET-128-138-0-0-1
OrgID:          UNIVER-24
Parent:         NET-128-0-0-0-0
NetName:        COLORADO
NetRange:       128.138.0.0 - 128.138.255.255
NetType:        allocation
RegDate:        1986-07-14
Updated:        2021-12-14
TechHandle:     CUBOU-ARIN
AbuseHandle:    ABUSE306-ARIN
Source:         ARIN


OrgID:          UNIVER-24
OrgName:        University of Colorado
CanAllocate:    
Street:         Office of Information Technology
Street:         3645 Marine Street
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0455
RegDate:        1986-03-11
Updated:        2019-06-25
OrgAdminHandle: CUBOU-ARIN
OrgTechHandle:  CUBOU-ARIN
OrgAbuseHandle: ABUSE306-ARIN
Source:         ARIN


POCHandle:      CUBOU-ARIN
IsRole:         Y
LastName:       CUBoulder
FirstName:      
Street:         3645 Marine Street
Street:         Campus Box 455
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0445
RegDate:        2011-11-11
Updated:        2025-07-14
OfficePhone:    +1-303-735-4357
Mailbox:        [email protected]
Source:         ARIN


POCHandle:      ABUSE306-ARIN
IsRole:         Y
LastName:       Abuse
FirstName:      
Street:         Information Technology Services
Street:         3645 Marine Street
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0455
RegDate:        2003-05-27
Updated:        2025-07-22
OfficePhone:    +1-303-735-4357
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
128.132.0.0/16 AS668 Air Force Systems Networking 65,536
128.177.0.0/16 AS6461 Zayo Bandwidth 65,536
128.211.0.0/16 AS397501 Purdue University 65,536
128.112.0.0/16 AS88 Princeton University 65,536
128.184.0.0/16 AS7645 Deakin University 65,536
128.235.0.0/16 AS4246 New Jersey Institute of Technology 65,536
128.187.0.0/16 AS6510 Brigham Young University 65,536
128.124.0.0/16 AS21497 PrJSC VF UKRAINE 65,536
128.25.0.0/16 AS749 DoD Network Information Center 65,536
128.176.0.0/16 AS680 Universitaet Muenster, CIT 65,536
128.210.0.0/16 AS397511 Purdue University 65,536
128.227.0.0/16 AS6356 University of Florida 65,536
128.7.0.0/16 AS680 Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. 65,536
128.211.0.0/16 AS397511 Purdue University 65,536
128.229.0.0/16 AS7281 Booz Allen Hamilton Inc. 65,536
128.105.0.0/16 AS59 University of Wisconsin Madison 65,536
128.231.0.0/16 AS3527 National Institutes of Health 65,536
128.171.0.0/16 AS6360 University of Hawaii 65,536
128.56.0.0/16 AS749 Navy Network Information Center (NNIC) 65,536
128.133.0.0/16 AS749 Air Force Systems Networking 65,536
128.193.0.0/16 AS4201 Oregon State University 65,536
128.180.0.0/16 AS6522 Lehigh University 65,536
128.80.0.0/16 AS749 DoD Network Information Center 65,536
128.165.0.0/16 AS68 Los Alamos National Laboratory 65,536
128.220.0.0/16 AS5723 Johns Hopkins University 65,536
128.218.0.0/16 AS5653 University of California San Francisco 65,536
128.91.0.0/16 AS55 University of Pennsylvania 65,536
128.101.0.0/16 AS217 University of Minnesota 65,536
128.248.0.0/16 AS6200 University of Illinois Chicago 65,536
128.104.0.0/16 AS59 University of Wisconsin Madison 65,536
128.14.0.0/16 AS21859 Zenlayer Inc 65,536
128.12.0.0/16 AS32 Stanford University 65,536
128.206.0.0/16 AS26934 University of Missouri-Columbia 65,536
128.29.0.0/16 AS35 The MITRE Corporation 65,536
128.175.0.0/16 AS34 University of Delaware 65,536
128.62.0.0/16 AS18 University of Texas at Austin 65,536
128.146.0.0/16 AS159 Ohio State University 65,536
128.27.0.0/16 AS17511 OPTAGE Inc. 65,536
128.10.0.0/16 AS17 Purdue University 65,536
128.214.0.0/16 AS1741 CSC - Tieteen tietotekniikan keskus Oy 65,536
128.182.0.0/16 AS1206 Pittsburgh Supercomputing Center 65,536
128.136.0.0/16 AS13649 Flexential Corp. 65,536
128.87.0.0/16 AS158 Telefonaktiebolaget LM Ericsson 65,536
128.110.0.0/16 AS17055 University of Utah 65,536
128.210.0.0/16 AS17 Purdue University 65,536
128.21.0.0/16 AS16509 Amazon.com, Inc. 65,536
128.169.0.0/16 AS16989 The University of Tennessee Health Science Center 65,536

Hosted domains

There are 72 domain names hosted across 30 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
128.138.68.45 eyestone.org 14
128.138.135.43 nsidc.org 11
128.138.136.14 ifkn.org 9
128.138.136.36 reanalysis.net 4
128.138.29.28 boulderinternshousing.com 3
128.138.136.96 geiacenter.org 2
128.138.73.57 matte.ooo 2
128.138.70.66 openearthscape.org 2
128.138.136.220 insidethegreenhouse.net 2
128.138.67.162 safe-schools.org 2
128.138.93.14 openmicrobiome.org 2
128.138.67.195 blueprintsprograms.org 2
128.138.136.128 learningassistantalliance.org 1
128.138.136.106 thwaitesglacier.org 1
128.138.129.114 argovis.org 1
128.138.184.20 riverware.org 1
128.138.184.15 riverware.online 1
128.138.93.63 openpkcommons.org 1
128.138.238.171 dsstmodel.org 1
128.138.131.6 lasp.link 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

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

IP Address ASN Details
128.138.212.15 AS104 University of Colorado at Boulder 1.99ms from Denver, US
128.138.228.138 AS104 University of Colorado at Boulder 1.75ms from Denver, US
128.138.128.54 AS104 University of Colorado at Boulder 1.63ms from Denver, US
128.138.196.134 AS104 University of Colorado at Boulder 2.03ms from Denver, US
128.138.159.33 AS104 University of Colorado at Boulder 2.13ms from Denver, US
128.138.179.35 AS104 University of Colorado at Boulder 2.19ms from Denver, US
128.138.210.34 AS104 University of Colorado at Boulder 2.14ms from Denver, US
128.138.149.11 AS104 University of Colorado at Boulder 2.41ms from Denver, US
128.138.136.22 AS104 University of Colorado at Boulder 1.80ms from Denver, US
128.138.237.15 AS104 University of Colorado at Boulder 1.97ms from Denver, US
128.138.191.47 AS104 University of Colorado at Boulder 2.42ms from Denver, US
128.138.127.203 AS104 University of Colorado at Boulder 2.04ms from Denver, US
128.138.244.13 AS104 University of Colorado at Boulder 2.02ms from Denver, US
128.138.139.9 AS104 University of Colorado at Boulder 1.85ms from Denver, US
128.138.249.53 AS104 University of Colorado at Boulder 1.89ms from Denver, US
128.138.129.121 AS104 University of Colorado at Boulder 1.71ms from Denver, US
128.138.214.24 AS104 University of Colorado at Boulder 1.90ms from Denver, US
128.138.239.13 AS104 University of Colorado at Boulder 3.46ms from Denver, US
128.138.131.18 AS104 University of Colorado at Boulder 2.20ms from Denver, US
128.138.118.7 AS104 University of Colorado at Boulder 2.10ms from Denver, US
128.138.213.5 AS104 University of Colorado at Boulder 2.48ms from Denver, US
128.138.240.1 AS104 University of Colorado at Boulder 2.07ms from Denver, US
128.138.150.57 AS104 University of Colorado at Boulder 2.02ms from Denver, US
128.138.200.51 AS104 University of Colorado at Boulder 2.32ms from Denver, US
128.138.143.145 AS104 University of Colorado at Boulder 2.44ms from Denver, 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
209.162.10.96 AS7029 Windstream Communications LLC 0.52ms from Ashburn, US
93.77.157.80 AS16509 Amazon.com, Inc. 0.03ms from Bangkok, TH
212.37.168.0 AS35205 RFT kabel Brandenburg GmbH 4.54ms from Berlin, DE
81.83.170.128 AS6848 Telenet BV 9.73ms from Brussels, BE
79.227.237.224 AS3320 Deutsche Telekom AG 3.48ms from Duesseldorf, DE
148.71.143.0 AS12353 Vodafone Portugal 6.36ms from Lisbon, PT
129.227.195.176 AS63593 HeyTap PTE.LTD. 0.55ms from Mumbai, IN
95.87.119.16 AS7514 Computer Engineering & Consulting, Ltd. 1.31ms from Tokyo, JP
219.234.163.176 AS17964 Beijing Dian-Xin-Tong Network Technologies Co., Ltd. 4.44ms from Beijing, CN
157.181.166.208 AS2012 ELTENET 0.59ms from Budapest, HU
196.131.226.224 AS24835 Vodafone Data 9.76ms from Cairo, EG
156.223.185.48 AS8452 TE-AS 5.96ms from Cairo, EG
102.40.78.192 AS8452 TE-AS 6.82ms from Cairo, EG
187.155.0.160 AS8151 UNINET 12.92ms from Cancún, MX
34.80.193.0 AS396982 Google LLC 0.14ms from Chang-hua, TW
97.183.135.32 AS6167 Verizon Business 18.89ms from Chicago, US
185.99.96.32 AS215540 GLOBAL CONNECTIVITY SOLUTIONS LLP 0.67ms from Frankfurt am Main, DE
148.222.237.0 AS64155 EDGEUNO S.A.C. 0.31ms from Lima, PE
94.1.53.224 AS5607 Sky UK Limited 3.53ms from London, GB
54.158.208.32 AS14618 Amazon.com, Inc. 0.21ms from Reston, US
35.169.232.96 AS14618 Amazon.com, Inc. 0.24ms from Reston, US
104.236.158.224 AS14061 DigitalOcean, LLC 0.25ms from Santa Clara, US
39.122.42.64 AS9318 SK Broadband Co Ltd 7.80ms from Seoul, KR
80.61.49.112 AS1136 KPN B.V. 1.32ms from Amsterdam, NL
54.218.199.176 AS16509 Amazon.com, Inc. 0.16ms 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 -f3 -m12 128.138.23.192
traceroute to 128.138.23.192 (128.138.23.192): 12 hops max, 52 byte packets
4 *
5 *
6 *
7 [] 206.51.46.23 47.397 ms
9 [AS104] 198.59.55.9 63.739 ms
10 *
11 *
12 *
Measurement taken from IPinfo ProbeNet in Halifax, CA
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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