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:      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


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

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
128.27.0.0/16 AS17511 OPTAGE Inc. 65,536
128.110.0.0/16 AS17055 University of Utah 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
128.196.0.0/16 AS1706 The University of Arizona 65,536
128.211.0.0/16 AS17 Purdue University 65,536
128.87.0.0/16 AS158 Telefonaktiebolaget LM Ericsson 65,536
128.210.0.0/16 AS17 Purdue University 65,536
128.167.0.0/16 AS16509 Amazon.com, Inc. 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
128.13.0.0/16 AS12007 RTX Corporation 65,536
128.230.0.0/16 AS11872 Syracuse University 65,536
128.147.0.0/16 AS122 UPMC 65,536
128.46.0.0/16 AS17 Purdue University 65,536
128.13.0.0/16 AS1341 RTX Corporation 65,536
128.173.0.0/16 AS1312 Virginia Polytechnic Institute and State Univ. 65,536
128.59.0.0/16 AS14 Columbia University 65,536
128.245.0.0/16 AS14340 Salesforce.com, Inc. 65,536
128.3.0.0/16 AS16 Lawrence Berkeley National Laboratory 65,536
128.135.0.0/16 AS160 The University of Chicago 65,536
128.125.0.0/16 AS16509 Amazon Technologies Inc. 65,536
128.11.0.0/16 AS16509 Amazon.com, Inc. 65,536
128.181.0.0/16 AS16509 Amazon Technologies Inc. 65,536
128.188.0.0/16 AS16509 Amazon Technologies Inc. 65,536
128.212.0.0/16 AS16509 Amazon.com, Inc. 65,536
128.81.0.0/16 AS16509 Amazon.com, Inc. 65,536
128.82.0.0/16 AS1201 Old Dominion University 65,536
128.146.0.0/16 AS159 Ohio State University 65,536
128.239.0.0/16 AS11975 The College of William and Mary 65,536
128.122.0.0/16 AS12 New York University 65,536
128.182.0.0/16 AS1206 Pittsburgh Supercomputing Center 65,536
128.182.0.0/16 AS1207 Pittsburgh Supercomputing Center 65,536
128.149.0.0/16 AS127 National Aeronautics and Space Administration 65,536
128.119.0.0/16 AS1249 University of Massachusetts - AMHERST 65,536
128.111.0.0/16 AS131 University of California, Santa Barbara 65,536
128.63.0.0/16 AS13 Headquarters, USAISC 65,536
128.250.0.0/16 AS10148 The University of Melbourne 65,536
128.150.0.0/16 AS102 U.S. National Science Foundation 65,536
128.136.0.0/16 AS13649 Flexential Corp. 65,536
128.17.0.0/16 AS14340 Salesforce.com, Inc. 65,536
128.107.0.0/16 AS109 CISCO SYSTEMS, INC. 65,536
128.164.0.0/16 AS11039 The George Washington University 65,536
128.197.0.0/16 AS111 Boston University 65,536
128.33.0.0/16 AS11488 RTX BBN Technologies, Inc. 65,536
128.103.0.0/16 AS1742 Harvard University 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.xyz 14
128.138.135.43 nsidc.org 11
128.138.136.14 nc-riscc.org 9
128.138.136.36 reanalysis.net 4
128.138.29.28 boulderinterns.com 3
128.138.67.195 blueprintsprograms.org 2
128.138.136.96 igacproject.org 2
128.138.70.66 openearthscape.com 2
128.138.93.186 kundor.org 2
128.138.136.220 insidethegreenhousearchive.world 2
128.138.93.14 openmicrobiome.org 2
128.138.67.162 safe-schools.org 2
128.138.131.6 lasp.link 1
128.138.131.2 inspiresat.com 1
128.138.136.89 pacesproject.org 1
128.138.73.83 explicet.org 1
128.138.129.114 argovis.org 1
128.138.184.15 riverware.online 1
128.138.149.11 sociotech.net 1
128.138.136.106 thwaitesglacier.org 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

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

IP Address ASN Details
128.138.112.176 AS104 University of Colorado at Boulder 1.84ms from Denver, US
128.138.200.51 AS104 University of Colorado at Boulder 2.28ms from Denver, US
128.138.73.56 AS104 University of Colorado at Boulder 1.79ms from Denver, US
128.138.89.8 AS104 University of Colorado at Boulder 1.88ms from Denver, US
128.138.225.84 AS104 University of Colorado at Boulder 1.93ms from Denver, US
128.138.179.35 AS104 University of Colorado at Boulder 2.39ms from Denver, US
128.138.212.16 AS104 University of Colorado at Boulder 1.92ms from Denver, US
128.138.244.13 AS104 University of Colorado at Boulder 2.29ms from Denver, US
128.138.131.18 AS104 University of Colorado at Boulder 2.11ms from Denver, US
128.138.86.8 AS104 University of Colorado at Boulder 1.63ms from Denver, US
128.138.240.1 AS104 University of Colorado at Boulder 2.38ms from Denver, US
128.138.82.254 AS104 University of Colorado at Boulder 1.39ms from Denver, US
128.138.136.128 AS104 University of Colorado at Boulder 1.75ms from Denver, US
128.138.150.57 AS104 University of Colorado at Boulder 2.03ms from Denver, US
128.138.227.28 AS104 University of Colorado at Boulder 1.76ms from Denver, US
128.138.93.175 AS104 University of Colorado at Boulder 1.68ms from Denver, US
128.138.130.30 AS104 University of Colorado at Boulder 1.77ms from Denver, US
128.138.152.79 AS104 University of Colorado at Boulder 1.88ms from Denver, US
128.138.239.13 AS104 University of Colorado at Boulder 2.09ms from Denver, US
128.138.97.102 AS104 University of Colorado at Boulder 1.60ms from Denver, US
128.138.232.78 AS104 University of Colorado at Boulder 1.63ms from Denver, US
128.138.184.28 AS104 University of Colorado at Boulder 1.73ms from Denver, US
128.138.129.146 AS104 University of Colorado at Boulder 1.57ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.81ms from Denver, US
128.138.143.145 AS104 University of Colorado at Boulder 2.36ms 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
23.44.70.160 AS16625 Akamai Technologies, Inc. 0.31ms from Amsterdam, NL
101.19.248.144 AS4837 CHINA UNICOM China169 Backbone 8.56ms from Beijing, CN
139.84.154.160 AS20473 The Constant Company, LLC 0.14ms from Bengaluru, IN
181.134.37.240 AS13489 UNE EPM TELECOMUNICACIONES S.A. 7.25ms from Bogotá, CO
139.155.103.160 AS45090 Shenzhen Tencent Computer Systems Company Limited 0.81ms from Chengdu, CN
173.21.246.32 AS30036 Mediacom Communications Corp 7.49ms from Chicago, US
18.218.81.160 AS16509 Amazon.com, Inc. 0.20ms from Columbus, US
94.133.246.64 AS2860 NOS COMUNICACOES, S.A. 16.91ms from Lisbon, PT
209.81.121.96 AS16904 Arvig Enterprises Inc. 4.59ms from Minneapolis, US
36.150.29.32 AS56046 China Mobile communications corporation 6.30ms from Nanjing, CN
183.155.113.96 AS4134 CHINANET-BACKBONE 7.20ms from Ningbo, CN
51.174.102.240 AS29695 Lyse Tele AS 7.36ms from Oslo, NO
70.110.131.16 AS701 Verizon Business 2.43ms from Philadelphia, US
23.119.167.128 AS7018 AT&T Enterprises, LLC 6.88ms from San Jose, US
73.19.22.48 AS7922 Comcast Cable Communications, LLC 2.20ms from Seattle, US
84.226.118.144 AS6730 Sunrise GmbH 1.25ms from Zuerich, CH
117.253.206.16 AS9829 National Internet Backbone 10.02ms from Delhi, IN
158.101.188.240 AS31898 Oracle Corporation 0.28ms from Frankfurt am Main, DE
91.5.208.48 AS3320 Deutsche Telekom AG 5.39ms from Frankfurt am Main, DE
87.182.204.64 AS3320 Deutsche Telekom AG 2.57ms from Frankfurt am Main, DE
88.157.13.144 AS2860 NOS COMUNICACOES, S.A. 2.85ms from Lisbon, PT
95.31.158.48 AS8402 PJSC "Vimpelcom" 9.03ms from Novosibirsk, RU
126.94.148.144 AS17676 SoftBank Corp. 4.21ms from Osaka, JP
183.107.174.208 AS4766 Korea Telecom 3.13ms from Seoul, KR
178.113.186.0 AS25255 ==> TELE2 AUSTRIA <== 13.83ms from Vienna, AT

Traceroute

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

$
traceroute -a -n -q1 -f3 128.138.89.33
traceroute to 128.138.89.33 (128.138.89.33): 64 hops max, 52 byte packets
3 [] 206.53.175.22 0.354 ms
4 [AS104] 198.59.55.9 1.287 ms
5 [AS104] 128.138.81.194 3.111 ms
7 [AS104] 128.138.81.13 286.361 ms
8 [AS104] 128.138.89.33 1.316 ms
Measurement taken from IPinfo ProbeNet in Denver, 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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