AS number details

AS104

University of Colorado at Boulder  ·  colorado.edu

AS104 – University of Colorado at Boulder

Country United States
Website colorado.edu
Hosted domains 108
Number of IPs 74,496
ASN type Education
Allocated 35 years ago on Apr 09, 1987

IP Address Ranges

Netblock Company Num of IPs
128.138.0.0/16 University of Colorado 65,536
146.5.20.0/22 National Solar Observatory 1,024
192.12.238.0/24 University of Colorado 256
192.12.240.0/24 University of Colorado 256
192.12.242.0/24 University of Colorado 256
192.12.244.0/24 University of Colorado 256
192.12.245.0/24 University of Colorado 256
198.11.16.0/20 University of Colorado Boulder 4,096
198.59.51.0/24 University of Colorado Boulder 256
198.59.52.0/24 University of Colorado Boulder 256
198.59.54.0/24 University of Colorado Boulder 256
198.59.55.0/24 University of Colorado Boulder 256
198.59.70.0/24 University of Colorado Boulder 256
198.59.7.0/24 University of Colorado Boulder 256
198.59.81.0/24 University of Colorado Boulder 256
198.59.82.0/24 University of Colorado Boulder 256
198.59.83.0/24 University of Colorado Boulder 256
204.228.80.0/24 University of Colorado Boulder 256
Netblock Company
2001:468:501::/48 University Corporation for Atmospheric Research
2620:18f::/32 University of Colorado Boulder
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WHOIS Details

ASHandle:       AS104
OrgID:          UCAB-2
ASName:         COLORADO-AS
ASNumber:       104
RegDate:        1987-04-09
Updated:        2019-06-25
AbuseHandle:    ABUSE306-ARIN
TechHandle:     CUBOU-ARIN
Source:         ARIN


OrgID:          UCAB-2
OrgName:        University of Colorado at Boulder
CanAllocate:    
Street:         Campus Box 455
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0455
RegDate:        1987-04-09
Updated:        2019-06-25
OrgAbuseHandle: ABUSE306-ARIN
OrgAdminHandle: CUBOU-ARIN
OrgTechHandle:  CUBOU-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:        2021-07-22
OfficePhone:    +1-303-735-4357
Mailbox:        abuse@colorado.edu
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:        2021-06-24
OfficePhone:    +1-303-735-4357
Mailbox:        arinadmin@colorado.edu
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:        2021-06-24
OfficePhone:    +1-303-735-4357
Mailbox:        arinadmin@colorado.edu
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:        2021-07-22
OfficePhone:    +1-303-735-4357
Mailbox:        abuse@colorado.edu
Source:         ARIN
Get all this data and more in JSON format using our ASN API Read More

Hosted Domains

There are 108 domain names hosted across 54 IP addresses on this ASN.

IP Address Domain Domains on this IP
128.138.92.5 fraziercreative.net 14
128.138.135.43 eloka-arctic.org 11
128.138.184.51 boulderexperimental.art 7
128.138.129.52 bolderbattery.com 6
128.138.129.163 lowry-lab.org 5
128.138.136.14 nna-co.org 4
128.138.136.36 reanalysis.net 4
128.138.29.28 boulderinternshousing.com 3
128.138.129.16 phet-colorado.org 3
128.138.136.220 insidethegreenhouse.net 2
128.138.67.162 safecommunities-safeschools.org 2
128.138.93.14 openmicrobiome.org 2
128.138.70.66 openearthscape.org 2
128.138.131.2 inspiresat.com 2
128.138.67.15 benignviolationtheory.org 2
128.138.135.152 glims.net 1
198.59.7.50 vizwiz.org 1
128.138.228.70 gidandes.com 1
128.138.223.2 andrewreineberg.com 1
128.138.136.170 icacgp-igac2018.org 1
128.138.97.135 moddel.net 1
128.138.92.20 airwatergas.org 1
128.138.136.106 thwaitesglacier.org 1
128.138.96.76 cosmichael.net 1
198.11.21.11 818108.com 1
128.138.184.15 riverware.org 1
128.138.73.51 peterrrock2.com 1
128.138.184.28 buff.link 1
128.138.128.243 cualum.org 1
128.138.140.2 fops2015.org 1
128.138.196.11 dylancanfield.com 1
128.138.112.161 unixops.com 1
128.138.131.6 lasp.link 1
128.138.184.187 bouldersolarreu.com 1
192.12.240.40 v4vsv6.com 1
128.138.222.40 hamlington.me 1
128.138.72.69 virtuallaboratory.net 1
128.138.136.96 igacproject.org 1
198.11.30.136 katelusedor.com 1
146.5.21.69 operationsupernova.com 1
128.138.73.24 argovis.com 1
128.138.136.89 pacesproject.org 1
128.138.72.70 bioliteracy.net 1
128.138.182.21 gsbcolorado.com 1
198.59.83.9 culh2022capstonedemo.xyz 1
128.138.93.58 controlelements.org 1
128.138.241.16 idigpaleo.org 1
198.59.7.40 paulconstantine.net 1
128.138.73.83 explicet.org 1
128.138.183.69 eithrive.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

Peers

There are 2 peers for this ASN.

Peers Name
AS14041 University Corporation for Atmospheric Research
AS209 CenturyLink Communications, LLC
Get all this data and more in JSON format using our ASN API Read More

Upstreams

There are 2 upstreams for this ASN.

upstreams Name
AS14041 University Corporation for Atmospheric Research
AS209 CenturyLink Communications, LLC
Get all this data and more in JSON format using our ASN API Read More

Downstreams

There are no downstreams for this ASN.

Get all this data and more in JSON format using our ASN API Read More

Related Networks

What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS104 at robtex.

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