Autonomous System details

AS104

University of Colorado at Boulder  ·  colorado.edu

United States

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AS104 – University of Colorado at Boulder

Field Value
Country United States
Website colorado.edu
Hosted domains 78
IPv4 addresses 91,136
IPv6 addresses 79,229,371,440,083,952,222,718,656,512
ASN type Education
Registry arin
Allocated 39 years ago on Apr 09, 1987
Updated 7 years ago on Jun 25, 2019

IP Ranges

Netblock Company Num of IPs
128.138.0.0/16 University of Colorado 65,536
129.19.192.0/18 University of Colorado Boulder 16,384
198.11.16.0/20 University of Colorado Boulder 4,096
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
192.12.241.0/24 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
198.59.7.0/24 University of Colorado Boulder 256
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
198.59.81.0/24 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
2620:18f::/32 University of Colorado Boulder
2001:468:501::/48 University Corporation for Atmospheric Research
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WHOIS Details

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                                                ASHandle:       AS104
                                                OrgID:          AS104
                                                ASName:         AS104
                                                ASNumber:       AS104
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA
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Hosted Domains

There are 78 domain names hosted across 36 IP addresses on this ASN.

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IP Address Domain Domains on this IP
128.138.68.45 ██████████ 14
128.138.135.43 █████████ 11
128.138.136.14 █████████ 9
128.138.136.36 ██████████ 4
128.138.29.28 ██████████ 3
128.138.136.96 ██████████ 2
128.138.67.195 ██████████ 2
128.138.67.162 ██████████ 2
128.138.93.186 █████████ 2
128.138.93.14 ██████████ 2

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Peers

There are 2 peers for this ASN.

Peers Name
AS14041 University Corporation for Atmospheric Research
AS3356 Level 3 Parent, LLC
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ASN API & Database

Upstreams

There are 2 upstreams for this ASN.

upstreams Name
AS14041 University Corporation for Atmospheric Research
AS3356 Level 3 Parent, LLC
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ASN API & Database

Downstreams

There are no downstreams for this ASN.

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ASN API & Database

Pingable IPs

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

IP Address ASN Details
128.138.136.205 AS104 University of Colorado at Boulder 1.77ms from Denver, US
128.138.191.41 AS104 University of Colorado at Boulder 1.84ms from Denver, US
128.138.129.143 AS104 University of Colorado at Boulder 1.59ms from Denver, US
128.138.210.16 AS104 University of Colorado at Boulder 2.27ms from Denver, US
192.12.244.18 AS104 University of Colorado at Boulder 1.19ms from Denver, US
128.138.200.51 AS104 University of Colorado at Boulder 1.96ms from Denver, US
128.138.228.138 AS104 University of Colorado at Boulder 1.82ms from Denver, US
128.138.81.254 AS104 University of Colorado at Boulder 1.34ms from Denver, US
146.5.21.125 AS104 University of Colorado at Boulder 1.62ms from Denver, US
146.5.23.212 AS104 University of Colorado at Boulder 1.22ms from Denver, US
192.12.245.119 AS104 University of Colorado at Boulder 1.21ms from Denver, US
128.138.92.52 AS104 University of Colorado at Boulder 1.65ms from Denver, US
128.138.67.162 AS104 University of Colorado at Boulder 1.62ms from Denver, US
128.138.86.8 AS104 University of Colorado at Boulder 1.81ms from Denver, US
128.138.135.20 AS104 University of Colorado at Boulder 1.74ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.29ms from Denver, US
128.138.101.155 AS104 University of Colorado at Boulder 240.42ms from Denver, US
128.138.219.134 AS104 University of Colorado at Boulder 1.84ms from Denver, US
128.138.150.57 AS104 University of Colorado at Boulder 2.22ms from Denver, US
128.138.225.84 AS104 University of Colorado at Boulder 1.78ms from Denver, US
128.138.133.19 AS104 University of Colorado at Boulder 2.11ms from Denver, US
128.138.239.13 AS104 University of Colorado at Boulder 2.42ms from Denver, US
128.138.214.41 AS104 University of Colorado at Boulder 1.93ms from Denver, US
128.138.212.15 AS104 University of Colorado at Boulder 2.35ms from Denver, US
128.138.163.41 AS104 University of Colorado at Boulder 1.94ms 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
154.246.66.88 AS36947 Telecom Algeria 13.54ms from Algiers, DZ
68.110.158.8 AS22773 Cox Communications Inc. 8.76ms from Ashburn, US
35.236.199.104 AS396982 Google LLC 0.13ms from Ashburn, US
125.163.217.184 AS7713 PT Telekomunikasi Indonesia 1.85ms from Batam, ID
50.50.48.216 AS5650 Frontier Communications of America, Inc. 13.42ms from Chicago, US
87.34.55.8 AS1213 ASIERA TECHNOLOGY SERVICES CLG 11.25ms from Dublin, IE
129.46.96.8 AS33198 Qualcomm, Inc. 2.26ms from Las Vegas, US
31.53.50.200 AS2856 British Telecommunications PLC 5.40ms from London, GB
123.243.223.200 AS7545 TPG Telecom Limited 1.59ms from Melbourne, AU
222.146.233.248 AS4713 NTT DOCOMO BUSINESS,Inc. 7.31ms from Osaka, JP
200.178.123.8 AS4230 CLARO S.A. 1.42ms from Osasco, BR
78.41.235.120 AS34177 CELESTE SAS 0.57ms from Paris, FR
140.137.239.248 AS1659 Taiwan Academic Network (TANet) Information Center 2.37ms from Taipei, TW
185.118.85.136 AS203962 JSC ProCredit Bank 0.87ms from Tbilisi, GE
119.112.83.120 AS4837 CHINA UNICOM China169 Backbone 9.32ms from Tieling, CN
126.65.121.72 AS17676 SoftBank Corp. 3.27ms from Tokyo, JP
38.117.71.8 AS40474 Think On, Inc. 5.10ms from Cleveland, US
147.26.99.72 AS18777 Texas State University 7.80ms from Dallas, US
104.245.52.8 AS63251 Metro Wireless International, Inc. 0.61ms from Detroit, US
79.221.221.8 AS3320 Deutsche Telekom AG 3.96ms from Duesseldorf, DE
76.139.164.200 AS7922 Comcast Cable Communications, LLC 7.92ms from Flint, US
98.194.152.40 AS7922 Comcast Cable Communications, LLC 5.98ms from Houston, US
88.26.4.136 AS3352 TELEFONICA DE ESPANA S.A.U. 0.97ms from Madrid, ES
88.13.51.72 AS3352 TELEFONICA DE ESPANA S.A.U. 8.18ms from Madrid, ES
34.36.99.120 AS396982 Google LLC 0.07ms from Mumbai, IN

Traceroute

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

$
traceroute -a -n -q1 -f3 -m7 128.138.50.94
traceroute to 128.138.50.94 (128.138.50.94): 7 hops max, 52 byte packets
3 [] 206.53.175.22 0.478 ms
4 [AS104] 198.59.55.9 1.344 ms
5 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Denver, US
On

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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