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
146.5.23.212 AS104 University of Colorado at Boulder 1.23ms from Denver, US
128.138.141.162 AS104 University of Colorado at Boulder 2.06ms from Denver, US
192.12.245.119 AS104 University of Colorado at Boulder 1.20ms from Denver, US
192.12.238.153 AS104 University of Colorado at Boulder 1.20ms from Denver, US
128.138.82.253 AS104 University of Colorado at Boulder 1.36ms 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
128.138.232.79 AS104 University of Colorado at Boulder 1.73ms from Denver, US
128.138.131.26 AS104 University of Colorado at Boulder 2.18ms from Denver, US
2620:18f:0:10a0::1 AS104 University of Colorado at Boulder 0.54ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.30ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.99ms from Denver, US
198.59.51.5 AS104 University of Colorado at Boulder 1.84ms from Denver, US
146.5.20.81 AS104 University of Colorado at Boulder 1.79ms from Denver, US
192.12.240.33 AS104 University of Colorado at Boulder 1.26ms from Denver, US
198.59.7.21 AS104 University of Colorado at Boulder 1.73ms from Denver, US
198.59.55.10 AS104 University of Colorado at Boulder 0.57ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.22ms from Denver, US
128.138.81.254 AS104 University of Colorado at Boulder 1.36ms 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
52.247.68.72 AS8075 Microsoft Corporation 0.19ms from Boydton, US
99.191.149.200 AS7018 AT&T Enterprises, LLC 11.77ms from Chicago, US
73.153.63.200 AS7922 Comcast Cable Communications, LLC 3.70ms from Denver, US
34.242.97.216 AS16509 Amazon.com, Inc. 0.30ms from Dublin, IE
223.199.36.56 AS4134 CHINANET BACKBONE 2.49ms from Haikou, CN
182.228.174.40 AS17858 LG POWERCOMM 2.12ms from Incheon, KR
219.249.200.136 AS9318 SK Broadband Co Ltd 5.99ms from Incheon, KR
61.179.191.88 AS4837 CHINA UNICOM China169 Backbone 4.18ms from Jinan, CN
94.15.151.104 AS5607 Sky UK Limited 3.27ms from London, GB
117.204.181.152 AS9829 National Internet Backbone 10.71ms from Mumbai, IN
68.198.130.8 AS6128 Cablevision Systems Corp. 7.59ms from New York City, US
100.11.225.8 AS701 Verizon Business 1.24ms from Philadelphia, US
200.242.28.24 AS4230 CLARO S.A. 8.38ms from Rio de Janeiro, BR
37.2.242.88 AS1257 Tele2 Sverige AB 13.64ms from Stockholm, SE
62.74.246.72 AS3329 Vodafone-panafon Hellenic Telecommunications Company SA 1.24ms from Athens, GR
158.69.31.56 AS16276 OVH SAS 0.08ms from Beauharnois, CA
62.206.165.56 AS20676 Plusnet GmbH 0.46ms from Duesseldorf, DE
34.102.0.88 AS396982 Google LLC 0.09ms from Los Angeles, US
4.232.105.8 AS8075 Microsoft Corporation 0.98ms from Milan, IT
173.224.45.152 AS36374 Stellar Association, LLC 6.49ms from Minneapolis, US
101.47.4.72 AS150436 Byteplus Pte. Ltd. 0.98ms from Singapore, SG
114.159.223.168 AS4713 NTT DOCOMO BUSINESS,Inc. 3.43ms from Tokyo, JP
24.226.22.152 AS7992 Cogeco Connexion Inc. 0.81ms from Toronto, CA
20.160.117.72 AS8075 Microsoft Corporation 0.26ms from Amsterdam, NL
98.173.137.136 AS22773 Cox Communications Inc. 0.67ms from Ashburn, US

Traceroute

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

$
traceroute -a -n -q1 -f2 -m12 128.138.220.30
traceroute to 128.138.220.30 (128.138.220.30): 12 hops max, 52 byte packets
2 [AS30059] 70.36.35.1 87.435 ms
3 *
4 *
5 *
6 *
7 [AS3356] 4.69.219.74 32.018 ms
8 [AS3356] 65.59.16.190 53.725 ms
9 [AS104] 128.138.81.253 33.295 ms
10 *
11 *
12 *
Measurement taken from IPinfo ProbeNet in Cincinnati, 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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