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
192.12.245.129 AS104 University of Colorado at Boulder 1.09ms from Denver, US
128.138.131.26 AS104 University of Colorado at Boulder 2.12ms from Denver, US
198.59.51.5 AS104 University of Colorado at Boulder 1.68ms from Denver, US
192.12.240.33 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
128.138.141.162 AS104 University of Colorado at Boulder 1.92ms from Denver, US
146.5.23.212 AS104 University of Colorado at Boulder 1.05ms from Denver, US
128.138.82.254 AS104 University of Colorado at Boulder 1.13ms from Denver, US
128.138.81.197 AS104 University of Colorado at Boulder 1.18ms from Denver, US
146.5.20.151 AS104 University of Colorado at Boulder 1.58ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.08ms from Denver, US
198.59.55.10 AS104 University of Colorado at Boulder 0.62ms from Denver, US
198.59.7.21 AS104 University of Colorado at Boulder 1.81ms from Denver, US
192.12.244.2 AS104 University of Colorado at Boulder 1.01ms from Denver, US
2620:18f:30:1000::2 AS104 University of Colorado at Boulder 1.21ms from Denver, US
2620:18f:0:10a0::1 AS104 University of Colorado at Boulder 0.53ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.21ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.65ms from Denver, US
192.12.238.129 AS104 University of Colorado at Boulder 1.00ms 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
77.49.168.200 AS1241 Forthnet 10.90ms from Athens, GR
89.210.98.232 AS3329 Vodafone-panafon Hellenic Telecommunications Company SA 1.50ms from Athens, GR
98.180.25.56 AS22773 Cox Communications Inc. 12.42ms from Atlanta, US
71.65.70.8 AS10796 Charter Communications Inc 15.41ms from Cleveland, US
217.41.67.104 AS2856 British Telecommunications PLC 2.71ms from Erith, GB
121.202.151.40 AS17924 SmarTone Mobile Communications Ltd 15.29ms from Hong Kong, HK
5.83.134.232 AS215136 Finn Hess trading as Ryzehosting 0.08ms from Kerkrade, NL
109.144.63.248 AS2856 British Telecommunications PLC 0.87ms from London, GB
114.167.50.168 AS4713 NTT DOCOMO BUSINESS,Inc. 2.83ms from Osaka, JP
112.245.99.248 AS4837 CHINA UNICOM China169 Backbone 5.06ms from Qingdao, CN
121.182.36.200 AS4766 Korea Telecom 5.45ms from Seoul, KR
45.178.117.24 AS269018 FIBER NET LTDA - ME 4.64ms from São Paulo, BR
13.113.237.56 AS16509 Amazon.com, Inc. 0.20ms from Tokyo, JP
59.106.107.152 AS9370 SAKURA Internet Inc. 0.70ms from Tokyo, JP
67.68.0.184 AS577 Bell Canada 6.18ms from Toronto, CA
91.244.205.184 AS210489 Beyond Relationship Marketing GmbH 1.49ms from Amsterdam, NL
35.245.82.232 AS396982 Google LLC 0.12ms from Ashburn, US
173.173.171.232 AS11427 Charter Communications Inc 15.85ms from Dallas, US
170.150.89.200 AS200908 Invermae Solutions SL 1.16ms from Madrid, ES
178.141.176.24 AS8359 MTS PJSC 16.35ms from Moscow, RU
115.216.251.232 AS4134 CHINANET BACKBONE 9.79ms from Ningbo, CN
34.225.152.248 AS14618 Amazon.com, Inc. 0.25ms from Reston, US
108.39.253.104 AS701 Verizon Business 6.46ms from Ashburn, US
160.179.96.24 AS36903 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM 5.03ms from Casablanca, MA
27.102.80.120 AS45996 DAOU TECHNOLOGY 0.99ms 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 -f3 -m8 128.138.8.21
traceroute to 128.138.8.21 (128.138.8.21): 8 hops max, 52 byte packets
3 [AS3356] 4.69.219.70 118.098 ms
4 [AS3356] 65.59.16.190 118.249 ms
5 [AS104] 128.138.81.253 118.41 ms
6 *
7 *
8 *
Measurement taken from IPinfo ProbeNet in Bogota, CO
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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