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 77
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 77 domain names hosted across 35 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
128.138.93.14 ██████████ 2
128.138.70.66 ██████████ 2
128.138.67.162 ██████████ 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

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

IP Address ASN Details
128.138.210.16 AS104 University of Colorado at Boulder 2.50ms from Denver, US
192.12.245.119 AS104 University of Colorado at Boulder 1.17ms from Denver, US
128.138.140.122 AS104 University of Colorado at Boulder 1.71ms from Denver, US
128.138.227.28 AS104 University of Colorado at Boulder 1.72ms from Denver, US
128.138.239.13 AS104 University of Colorado at Boulder 2.41ms from Denver, US
128.138.139.30 AS104 University of Colorado at Boulder 1.73ms from Denver, US
128.138.97.99 AS104 University of Colorado at Boulder 1.74ms from Denver, US
128.138.93.112 AS104 University of Colorado at Boulder 1.83ms from Denver, US
128.138.183.38 AS104 University of Colorado at Boulder 1.74ms from Denver, US
128.138.244.13 AS104 University of Colorado at Boulder 2.61ms from Denver, US
128.138.152.46 AS104 University of Colorado at Boulder 2.22ms from Denver, US
128.138.130.30 AS104 University of Colorado at Boulder 2.23ms from Denver, US
128.138.136.128 AS104 University of Colorado at Boulder 1.82ms from Denver, US
128.138.118.7 AS104 University of Colorado at Boulder 2.13ms from Denver, US
128.138.112.176 AS104 University of Colorado at Boulder 1.74ms from Denver, US
128.138.75.13 AS104 University of Colorado at Boulder 2.33ms from Denver, US
128.138.131.34 AS104 University of Colorado at Boulder 2.14ms from Denver, US
128.138.81.254 AS104 University of Colorado at Boulder 1.38ms from Denver, US
128.138.237.15 AS104 University of Colorado at Boulder 2.12ms from Denver, US
198.59.70.216 AS104 University of Colorado at Boulder 1.95ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.31ms from Denver, US
128.138.141.162 AS104 University of Colorado at Boulder 2.12ms from Denver, US
128.138.86.8 AS104 University of Colorado at Boulder 1.82ms from Denver, US
198.59.83.1 AS104 University of Colorado at Boulder 1.84ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.62ms 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
64.135.237.248 AS6536 CityNet 7.12ms from Cleveland, US
174.63.22.120 AS7922 Comcast Cable Communications, LLC 4.44ms from Denver, US
84.191.103.216 AS3320 Deutsche Telekom AG 7.47ms from Frankfurt am Main, DE
123.23.98.120 AS45899 VNPT Corp 3.53ms from Ho Chi Minh City, VN
148.197.6.8 AS786 Jisc Services Limited 4.46ms from London, GB
72.251.238.88 AS32475 Internap Holding LLC 0.68ms from New York City, US
82.127.177.8 AS3215 Orange S.A. 2.13ms from Paris, FR
100.14.121.24 AS701 Verizon Business 2.29ms from Philadelphia, US
119.191.15.184 AS4837 CHINA UNICOM China169 Backbone 3.81ms from Qingdao, CN
126.108.246.24 AS17676 SoftBank Corp. 7.65ms from Tokyo, JP
91.217.203.168 AS25378 BCR Asigurari SA 1.58ms from Bucharest, RO
66.25.138.120 AS11427 Charter Communications Inc 4.53ms from Dallas, US
45.157.180.152 AS212384 Simoresta UAB 0.22ms from Frankfurt am Main, DE
93.222.156.88 AS3320 Deutsche Telekom AG 8.70ms from Frankfurt am Main, DE
45.6.125.168 AS273580 Go Fibra Serviço de Telecomunicações LTDA 4.22ms from Joao Pessoa, BR
47.137.127.8 AS5650 Frontier Communications of America, Inc. 8.27ms from Los Angeles, US
194.169.174.72 AS210218 Open Fiber S.P.A. 10.57ms from Milan, IT
60.36.186.232 AS4713 NTT DOCOMO BUSINESS,Inc. 2.73ms from Osaka, JP
175.244.64.136 AS4766 Korea Telecom 9.52ms from Seoul, KR
210.179.132.8 AS4766 Korea Telecom 4.65ms from Seoul, KR
183.126.164.56 AS4766 Korea Telecom 1.99ms from Seoul, KR
101.89.189.200 AS4811 China Telecom (Group) 3.44ms from Shanghai, CN
139.198.42.200 AS59078 Yunify Technologies Inc. 4.64ms from Tianjin, CN
219.154.184.152 AS4837 CHINA UNICOM China169 Backbone 7.22ms from Zhengzhou, CN
178.39.38.24 AS6730 Sunrise GmbH 2.59ms from Zuerich, CH

Traceroute

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

$
traceroute -a -n -q1 -f4 -m8 128.138.117.15
traceroute to 128.138.117.15 (128.138.117.15): 8 hops max, 52 byte packets
4 [] 206.53.175.22 0.725 ms
5 [AS104] 198.59.55.9 1.647 ms
6 *
7 *
8 *
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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