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
128.138.67.162 ██████████ 2
128.138.73.57 █████████ 2
128.138.93.14 ██████████ 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 ASN Database Download

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 ASN Database Download

Downstreams

There are no downstreams for this ASN.

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ASN API ASN Database Download

Pingable IPs

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

IP Address ASN Details
128.138.163.40 AS104 University of Colorado at Boulder 1.99ms from Denver, US
192.12.244.65 AS104 University of Colorado at Boulder 1.20ms from Denver, US
128.138.133.19 AS104 University of Colorado at Boulder 2.29ms from Denver, US
128.138.219.134 AS104 University of Colorado at Boulder 2.33ms from Denver, US
128.138.129.16 AS104 University of Colorado at Boulder 1.23ms from Denver, US
128.138.196.134 AS104 University of Colorado at Boulder 2.21ms from Denver, US
128.138.131.18 AS104 University of Colorado at Boulder 2.34ms from Denver, US
128.138.135.20 AS104 University of Colorado at Boulder 1.86ms from Denver, US
128.138.70.84 AS104 University of Colorado at Boulder 2.17ms from Denver, US
128.138.74.152 AS104 University of Colorado at Boulder 2.44ms from Denver, US
2620:18f:0:10b0::1 AS104 University of Colorado at Boulder 0.55ms from Denver, US
128.138.87.50 AS104 University of Colorado at Boulder 2.23ms from Denver, US
128.138.152.46 AS104 University of Colorado at Boulder 1.88ms from Denver, US
198.59.70.5 AS104 University of Colorado at Boulder 1.86ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.29ms from Denver, US
128.138.105.157 AS104 University of Colorado at Boulder 2.19ms from Denver, US
128.138.75.13 AS104 University of Colorado at Boulder 2.67ms from Denver, US
146.5.21.120 AS104 University of Colorado at Boulder 1.77ms from Denver, US
192.12.238.202 AS104 University of Colorado at Boulder 1.19ms from Denver, US
128.138.184.11 AS104 University of Colorado at Boulder 1.79ms from Denver, US
128.138.73.57 AS104 University of Colorado at Boulder 1.76ms from Denver, US
128.138.81.197 AS104 University of Colorado at Boulder 1.42ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.95ms from Denver, US
128.138.214.41 AS104 University of Colorado at Boulder 1.75ms from Denver, US
128.138.89.8 AS104 University of Colorado at Boulder 1.93ms 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
73.200.180.56 AS7922 Comcast Cable Communications, LLC 7.04ms from Ashburn, US
177.207.105.40 AS18881 TELEFÔNICA BRASIL S.A 14.29ms from Belo Horizonte, BR
172.232.96.24 AS63949 Akamai Connected Cloud 0.76ms from Chennai, IN
110.226.254.184 AS24560 Bharti Airtel Ltd., Telemedia Services 10.10ms from Delhi, IN
38.175.183.248 AS397142 City of Fort Collins 1.95ms from Denver, US
117.31.55.136 AS4134 CHINANET-BACKBONE 6.81ms from Fuzhou, CN
120.238.103.248 AS56040 China Mobile communications corporation 4.18ms from Guangzhou, CN
120.193.61.120 AS56041 China Mobile communications corporation 3.79ms from Hangzhou, CN
38.38.21.152 AS398823 PEG TECH INC 0.27ms from Los Angeles, US
35.203.92.184 AS396982 Google LLC 0.09ms from Montreal, CA
182.106.156.40 AS139201 Jiangxi Jiujiang IDC 2.96ms from Nanchang, CN
35.138.53.8 AS33363 Charter Communications, Inc 9.67ms from Orlando, US
68.198.130.8 AS6128 Cablevision Systems Corp. 6.53ms from Secaucus, US
118.219.141.136 AS9318 SK Broadband Co Ltd 4.86ms from Seoul, KR
3.175.233.8 AS16509 Amazon.com, Inc. 0.96ms from Tokyo, JP
181.45.214.104 AS27747 Telecentro S.A. 6.29ms from Buenos Aires, AR
151.80.29.184 AS16276 OVH SAS 1.62ms from Gravelines, FR
81.86.193.104 AS13285 TalkTalk Communications Limited 6.47ms from London, GB
125.5.236.8 AS132212 IGT-INTERGLOBE TECHNOLOGIES PHILIPPINES INC. 0.49ms from Manila, PH
95.239.240.40 AS3269 Telecom Italia S.p.A. 7.37ms from Milan, IT
31.97.232.24 AS47583 Hostinger International Limited 0.38ms from Mumbai, IN
76.129.146.168 AS7922 Comcast Cable Communications, LLC 13.71ms from Murfreesboro, US
183.86.130.200 AS10010 TOKAI Communications Corporation 6.19ms from Osaka, JP
54.175.45.120 AS14618 Amazon.com, Inc. 0.14ms from Reston, US
59.146.180.24 AS2527 Sony Network Communications Inc. 8.60ms from Tokyo, JP

Traceroute

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

$
traceroute -a -n -q1 -f2 -m7 128.138.255.168
traceroute to 128.138.255.168 (128.138.255.168): 7 hops max, 52 byte packets
3 *
4 [AS3356] 4.69.219.74 112.039 ms
5 *
6 *
7 *
Measurement taken from IPinfo ProbeNet in Coventry, GB
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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