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
192.12.240.33 AS104 University of Colorado at Boulder 1.26ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.99ms from Denver, US
146.5.23.212 AS104 University of Colorado at Boulder 1.23ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.22ms from Denver, US
192.12.245.119 AS104 University of Colorado at Boulder 1.20ms from Denver, US
2620:18f:30:1000::2 AS104 University of Colorado at Boulder 1.25ms from Denver, US
192.12.244.18 AS104 University of Colorado at Boulder 1.21ms from Denver, US
2620:18f:0:10a0::1 AS104 University of Colorado at Boulder 0.54ms from Denver, US
128.138.82.253 AS104 University of Colorado at Boulder 1.36ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.30ms from Denver, US
192.12.238.153 AS104 University of Colorado at Boulder 1.20ms from Denver, US
128.138.141.162 AS104 University of Colorado at Boulder 2.06ms from Denver, US
146.5.20.81 AS104 University of Colorado at Boulder 1.79ms from Denver, US
198.59.55.10 AS104 University of Colorado at Boulder 0.57ms from Denver, US
128.138.81.254 AS104 University of Colorado at Boulder 1.36ms from Denver, US
128.138.131.26 AS104 University of Colorado at Boulder 2.18ms from Denver, US
198.59.51.5 AS104 University of Colorado at Boulder 1.84ms from Denver, US
128.138.232.79 AS104 University of Colorado at Boulder 1.73ms from Denver, US
198.59.7.21 AS104 University of Colorado at Boulder 1.73ms 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
98.173.137.136 AS22773 Cox Communications Inc. 0.67ms from Ashburn, US
76.17.107.184 AS7922 Comcast Cable Communications, LLC 3.88ms from Atlanta, US
44.237.236.152 AS16509 Amazon.com, Inc. 0.32ms from Boardman, US
163.182.102.232 AS6181 Cincinnati Bell Telephone Company LLC 4.31ms from Columbus, US
115.195.159.40 AS4134 CHINANET BACKBONE 5.91ms from Hangzhou, CN
14.184.158.8 AS45899 VNPT Corp 3.34ms from Ho Chi Minh City, VN
79.54.43.88 AS3269 Telecom Italia S.p.A. 3.28ms from Milan, IT
93.238.161.232 AS3320 Deutsche Telekom AG 4.85ms from Munich, DE
213.149.188.104 AS6866 Cyprus Telecommunications Authority 2.11ms from Nicosia, CY
62.168.49.120 AS13036 T-Mobile Czech Republic a.s. 0.44ms from Prague, CZ
176.109.26.8 AS43434 CJSC Contact TV 8.60ms from Samara, RU
20.194.7.8 AS8075 Microsoft Corporation 0.24ms from Seoul, KR
212.179.231.232 AS8551 Bezeq International Ltd. 6.74ms from Tel Aviv, IL
27.138.83.56 AS9824 JCOM Co., Ltd. 11.60ms from Tokyo, JP
78.158.10.8 AS43700 UAB Consilium Optimum 0.49ms from Vilnius, LT
61.150.76.72 AS4134 CHINANET BACKBONE 3.77ms from Xi'an, CN
154.197.110.88 AS211826 Istqrar for Servers Services Ltd 0.57ms from Amsterdam, NL
40.114.79.136 AS8075 Microsoft Corporation 0.41ms from Ashburn, US
93.237.27.72 AS3320 Deutsche Telekom AG 2.94ms from Frankfurt am Main, DE
217.41.67.104 AS2856 British Telecommunications PLC 2.63ms from London, GB
159.93.148.24 AS2875 Joint Institute for Nuclear Research 3.80ms from Moscow, RU
47.104.59.104 AS37963 Hangzhou Alibaba Advertising Co.,Ltd. 0.27ms from Qingdao, CN
109.231.18.136 AS34525 KOBA Sp. z o.o. 2.70ms from Warsaw, PL
92.18.221.8 AS13285 TalkTalk Communications Limited 2.43ms from Erith, GB
180.71.70.248 AS9318 SK Broadband Co Ltd 10.35ms from Incheon, KR

Traceroute

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

$
traceroute -a -n -q1 -f2 -m6 128.138.207.108
traceroute to 128.138.207.108 (128.138.207.108): 6 hops max, 52 byte packets
2 [AS58061] 38.180.36.1 0.354 ms
4 *
5 *
6 *
Measurement taken from IPinfo ProbeNet in Almaty, KZ
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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