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 79,229,371,440,083,952,629,200,000,000
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 ██████████ 13
128.138.135.43 █████████ 9
128.138.136.14 ██████████ 9
128.138.136.36 ██████████ 4
128.138.29.28 ██████████ 3
128.138.93.186 ██████████ 2
128.138.97.77 █████████ 2
128.138.67.195 ██████████ 2
128.138.70.66 ██████████ 2
128.138.136.96 ██████████ 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

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

IP Address ASN Details
2620:18f:0:10a0::1 AS104 University of Colorado at Boulder 0.53ms from Denver, US
146.5.23.212 AS104 University of Colorado at Boulder 1.05ms from Denver, US
192.12.245.129 AS104 University of Colorado at Boulder 1.09ms from Denver, US
128.138.82.254 AS104 University of Colorado at Boulder 1.13ms from Denver, US
2620:18f:30:1000::2 AS104 University of Colorado at Boulder 1.21ms from Denver, US
146.5.20.151 AS104 University of Colorado at Boulder 1.58ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.21ms from Denver, US
128.138.131.26 AS104 University of Colorado at Boulder 2.12ms from Denver, US
128.138.81.197 AS104 University of Colorado at Boulder 1.18ms from Denver, US
198.59.7.21 AS104 University of Colorado at Boulder 1.81ms from Denver, US
198.59.55.10 AS104 University of Colorado at Boulder 0.62ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.65ms from Denver, US
198.59.51.5 AS104 University of Colorado at Boulder 1.68ms from Denver, US
128.138.141.162 AS104 University of Colorado at Boulder 1.92ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.08ms from Denver, US
128.138.232.65 AS104 University of Colorado at Boulder 1.51ms from Denver, US
192.12.244.2 AS104 University of Colorado at Boulder 1.01ms from Denver, US
192.12.238.129 AS104 University of Colorado at Boulder 1.00ms from Denver, US
192.12.240.33 AS104 University of Colorado at Boulder 1.08ms 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
107.197.28.232 AS7018 AT&T Enterprises, LLC 3.35ms from Atlanta, US
12.152.125.40 AS7018 AT&T Enterprises, LLC 15.93ms from Atlanta, US
192.251.58.248 AS7086 Mississippi, Department of Information Technology Services (ITS) 8.16ms from Atlanta, US
39.97.201.232 AS37963 Hangzhou Alibaba Advertising Co.,Ltd. 2.67ms from Beijing, CN
75.221.177.136 AS6167 Verizon Business 13.45ms from Chicago, US
71.65.70.8 AS10796 Charter Communications Inc 15.41ms from Cleveland, US
125.141.224.184 AS4766 Korea Telecom 0.98ms from Incheon, KR
95.248.123.168 AS3269 Telecom Italia S.p.A. 2.76ms from Milan, IT
4.232.105.8 AS8075 Microsoft Corporation 1.08ms from Milan, IT
200.98.134.72 AS7162 Universo Online S.A. 1.18ms from Osasco, BR
90.115.171.248 AS3215 Orange S.A. 2.91ms from Paris, FR
43.106.128.232 AS45102 Alibaba (US) Technology Co., Ltd. 0.65ms from Singapore, SG
140.137.239.248 AS1659 Taiwan Academic Network (TANet) Information Center 2.39ms from Taipei, TW
67.68.0.184 AS577 Bell Canada 6.18ms from Toronto, CA
78.158.10.8 AS43700 UAB Consilium Optimum 0.52ms from Vilnius, LT
44.237.236.152 AS16509 Amazon.com, Inc. 0.46ms from Boardman, US
79.227.208.120 AS3320 Deutsche Telekom AG 4.09ms from Duesseldorf, DE
207.178.121.8 AS27425 IdeaTek Telcom, LLC 6.06ms from Kansas City, US
117.156.86.200 AS9808 China Mobile Communications Group Co., Ltd. 17.56ms from Lanzhou, CN
92.18.221.8 AS13285 TalkTalk Communications Limited 2.45ms from London, GB
45.147.201.136 AS51659 LLC Baxet 0.28ms from Moscow, RU
123.153.21.152 AS4837 CHINA UNICOM China169 Backbone 6.54ms from Ningbo, CN
61.200.127.216 AS10010 TOKAI Communications Corporation 6.08ms from Osaka, JP
114.167.50.168 AS4713 NTT DOCOMO BUSINESS,Inc. 2.83ms from Osaka, JP
190.111.174.24 AS270410 Infosimples Ltda. 0.62ms from Osasco, BR

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 128.138.117.121
traceroute to 128.138.117.121 (128.138.117.121): 7 hops max, 52 byte packets
3 [AS3356] 65.59.16.190 6.772 ms
4 [AS104] 128.138.81.253 6.977 ms
5 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Casper, 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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