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
128.138.70.66 ██████████ 2
128.138.67.195 ██████████ 2
128.138.93.14 ██████████ 2
128.138.93.186 ██████████ 2
128.138.136.220 ██████████ 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
128.138.92.105 AS104 University of Colorado at Boulder 1.78ms from Denver, US
198.59.55.10 AS104 University of Colorado at Boulder 0.90ms from Denver, US
128.138.93.112 AS104 University of Colorado at Boulder 1.83ms from Denver, US
128.138.179.35 AS104 University of Colorado at Boulder 2.52ms from Denver, US
128.138.71.4 AS104 University of Colorado at Boulder 1.99ms from Denver, US
128.138.159.33 AS104 University of Colorado at Boulder 2.26ms from Denver, US
128.138.89.33 AS104 University of Colorado at Boulder 1.80ms from Denver, US
2620:18f:0:10b0::1 AS104 University of Colorado at Boulder 0.56ms from Denver, US
128.138.130.30 AS104 University of Colorado at Boulder 2.23ms from Denver, US
128.138.249.53 AS104 University of Colorado at Boulder 2.50ms from Denver, US
128.138.101.141 AS104 University of Colorado at Boulder 240.09ms from Greenwood Village, US
192.12.238.1 AS104 University of Colorado at Boulder 1.20ms from Denver, US
192.12.240.33 AS104 University of Colorado at Boulder 1.26ms from Denver, US
128.138.141.162 AS104 University of Colorado at Boulder 2.12ms from Denver, US
198.59.83.1 AS104 University of Colorado at Boulder 1.84ms from Denver, US
146.5.23.212 AS104 University of Colorado at Boulder 1.21ms from Denver, US
128.138.219.134 AS104 University of Colorado at Boulder 1.91ms from Denver, US
128.138.129.194 AS104 University of Colorado at Boulder 1.65ms from Denver, US
128.138.183.38 AS104 University of Colorado at Boulder 1.74ms from Denver, US
128.138.87.50 AS104 University of Colorado at Boulder 2.24ms from Denver, US
128.138.240.1 AS104 University of Colorado at Boulder 1.73ms from Denver, US
198.59.51.24 AS104 University of Colorado at Boulder 1.85ms from Denver, US
128.138.225.117 AS104 University of Colorado at Boulder 1.83ms from Denver, US
128.138.232.78 AS104 University of Colorado at Boulder 1.61ms from Denver, US
128.138.135.105 AS104 University of Colorado at Boulder 1.78ms 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
37.26.35.216 AS39232 Uninet LLC 1.49ms from Baku, AZ
104.235.112.8 AS5650 Frontier Communications of America, Inc. 6.88ms from Chicago, US
74.205.122.8 AS33070 Rackspace Hosting 0.95ms from Dallas, US
20.238.32.24 AS8075 Microsoft Corporation 0.13ms from Dublin, IE
217.43.180.104 AS2856 British Telecommunications PLC 7.49ms from Erith, GB
76.88.134.216 AS20001 Charter Communications Inc 6.01ms from Honolulu, US
104.18.156.56 AS13335 Cloudflare, Inc. 0.10ms from Lisbon, PT
95.156.238.40 AS199610 marbis GmbH 0.20ms from Los Angeles, US
82.127.177.8 AS3215 Orange S.A. 2.13ms from Paris, FR
54.219.31.120 AS16509 Amazon.com, Inc. 0.15ms from San Jose, US
190.0.230.184 AS263713 Server Lodge S.A. 0.92ms from San Pedro, CR
189.165.245.120 AS8151 UNINET 5.52ms from Santiago de Queretaro, MX
73.254.28.24 AS7922 Comcast Cable Communications, LLC 4.28ms from Seattle, US
14.71.140.184 AS4766 Korea Telecom 1.45ms from Seoul, KR
122.107.67.248 AS4804 Microplex PTY LTD 5.46ms from Sydney, AU
98.186.90.200 AS22773 Cox Communications Inc. 10.69ms from Tulsa, US
197.26.252.104 AS37492 Orange Tunisie 14.09ms from Tunis, TN
129.122.15.8 AS327947 Kwame Nkrumah University of Science and Technology 6.36ms from Accra, GH
75.4.221.184 AS7018 AT&T Enterprises, LLC 1.87ms from Atlanta, US
209.162.59.24 AS7029 Windstream Communications LLC 3.67ms from Atlanta, US
192.251.58.248 AS7086 Mississippi, Department of Information Technology Services (ITS) 8.13ms from Atlanta, US
206.1.31.136 AS18229 CtrlS 0.24ms from Bengaluru, IN
88.242.99.40 AS9121 Turk Telekomunikasyon Anonim Sirketi 9.47ms from Bursa, TR
123.23.98.120 AS45899 VNPT Corp 3.53ms from Ho Chi Minh City, VN
43.218.11.152 AS16509 Amazon.com, Inc. 0.16ms from Jakarta, ID

Traceroute

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

$
traceroute -a -n -q1 -f4 128.138.131.12
traceroute to 128.138.131.12 (128.138.131.12): 64 hops max, 52 byte packets
4 [] 206.53.175.22 0.853 ms
5 [AS104] 198.59.55.9 1.631 ms
6 [AS104] 128.138.81.194 3.726 ms
7 [AS104] 128.138.81.249 1.662 ms
8 [AS104] 128.138.81.13 1.636 ms
10 [AS104] 128.138.131.12 2.308 ms
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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