AS number 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
Number of IPv4 91,136
Number of IPv6 79,229,371,440,083,952,222,718,656,512
ASN type Education
Registry arin
Allocated 39 years ago on Apr 09, 1987
Updated 6 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 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 █████████ 11
128.138.136.14 ██████████ 9
128.138.136.36 ██████████ 4
128.138.29.28 ██████████ 3
128.138.73.57 █████████ 2
128.138.67.195 ██████████ 2
128.138.136.96 ██████████ 2
128.138.70.66 ██████████ 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

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

IP Address ASN Details
128.138.74.152 AS104 University of Colorado at Boulder 2.00ms from Denver, US
128.138.232.65 AS104 University of Colorado at Boulder 1.82ms from Denver, US
128.138.212.16 AS104 University of Colorado at Boulder 2.41ms from Denver, US
128.138.81.197 AS104 University of Colorado at Boulder 1.41ms from Denver, US
128.138.127.234 AS104 University of Colorado at Boulder 2.17ms from Denver, US
128.138.129.97 AS104 University of Colorado at Boulder 1.67ms from Denver, US
128.138.135.55 AS104 University of Colorado at Boulder 2.03ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.32ms from Denver, US
128.138.239.13 AS104 University of Colorado at Boulder 2.23ms from Denver, US
128.138.150.57 AS104 University of Colorado at Boulder 1.95ms from Denver, US
192.12.244.26 AS104 University of Colorado at Boulder 1.19ms from Denver, US
128.138.140.44 AS104 University of Colorado at Boulder 1.24ms from Denver, US
128.138.86.8 AS104 University of Colorado at Boulder 1.95ms from Denver, US
128.138.183.47 AS104 University of Colorado at Boulder 1.69ms from Denver, US
128.138.82.253 AS104 University of Colorado at Boulder 1.41ms from Denver, US
128.138.89.8 AS104 University of Colorado at Boulder 1.71ms from Denver, US
192.12.238.153 AS104 University of Colorado at Boulder 1.19ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 2.01ms from Denver, US
128.138.29.167 AS104 University of Colorado at Boulder 1.81ms from Denver, US
128.138.118.7 AS104 University of Colorado at Boulder 2.71ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.31ms from Denver, US
128.138.67.137 AS104 University of Colorado at Boulder 1.78ms from Denver, US
198.59.83.1 AS104 University of Colorado at Boulder 1.92ms from Denver, US
128.138.141.179 AS104 University of Colorado at Boulder 1.80ms from Denver, US
2620:18f:20:8::12 AS104 University of Colorado at Boulder 2.17ms 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
82.156.135.216 AS45090 Shenzhen Tencent Computer Systems Company Limited 1.77ms from Beijing, CN
200.193.228.88 AS8167 V tal 4.25ms from Brasilia, BR
181.82.234.152 AS7303 Telecom Argentina S.A. 12.73ms from Buenos Aires, AR
175.22.177.200 AS4837 CHINA UNICOM China169 Backbone 4.89ms from Changchun, CN
107.91.55.136 AS20057 AT&T Enterprises, LLC 11.53ms from Chicago, US
97.209.90.88 AS6167 Verizon Business 13.09ms from Chicago, US
149.233.254.8 AS15943 wilhelm.tel GmbH 0.47ms from Hamburg, DE
77.3.108.216 AS6805 Telefonica Germany GmbH & Co.OHG 1.01ms from Hamburg, DE
81.255.132.136 AS3215 Orange S.A. 1.02ms from Paris, FR
106.246.52.40 AS3786 LG DACOM Corporation 2.32ms from Seoul, KR
121.134.215.104 AS4766 Korea Telecom 1.30ms from Seoul, KR
125.142.46.216 AS4766 Korea Telecom 1.67ms from Seoul, KR
118.53.137.136 AS4766 Korea Telecom 2.62ms from Seoul, KR
42.146.229.152 AS9824 JCOM Co., Ltd. 17.57ms from Tokyo, JP
111.38.151.104 AS9808 China Mobile Communications Group Co., Ltd. 10.01ms from Zhengzhou, CN
20.242.140.232 AS8075 Microsoft Corporation 0.60ms from Ashburn, US
175.23.156.40 AS4837 CHINA UNICOM China169 Backbone 8.82ms from Changchun, CN
24.49.217.104 AS11976 Fidelity Communication International Inc. 10.13ms from Dallas, US
20.150.21.8 AS8075 Microsoft Corporation 0.30ms from Johannesburg, ZA
34.208.208.24 AS16509 Amazon.com, Inc. 0.15ms from Boardman, US
111.8.136.24 AS56047 China Mobile communications corporation 9.91ms from Changsha, CN
75.244.148.232 AS6167 Verizon Business 19.22ms from Dallas, US
63.35.45.216 AS16509 Amazon.com, Inc. 0.19ms from Dublin, IE
91.228.122.8 AS197218 PP Dmutrashko Evgeny Vitalievich 9.08ms from Kyiv, UA
5.164.219.56 AS42682 JSC "ER-Telecom Holding" 6.17ms from Moscow, RU

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 128.138.53.231
traceroute to 128.138.53.231 (128.138.53.231): 8 hops max, 52 byte packets
4 [AS3356] 65.59.16.190 125.132 ms
5 [AS104] 128.138.81.253 124.987 ms
6 *
7 *
8 *
Measurement taken from IPinfo ProbeNet in Amsterdam, NL
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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