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
128.138.141.162 AS104 University of Colorado at Boulder 2.06ms from Denver, US
192.12.242.1 AS104 University of Colorado at Boulder 1.30ms from Denver, US
128.138.213.15 AS104 University of Colorado at Boulder 2.22ms from Denver, US
198.59.7.21 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
192.12.240.33 AS104 University of Colorado at Boulder 1.26ms 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
2620:18f:30:1000::2 AS104 University of Colorado at Boulder 1.25ms from Denver, US
146.5.23.212 AS104 University of Colorado at Boulder 1.23ms from Denver, US
146.5.20.81 AS104 University of Colorado at Boulder 1.79ms from Denver, US
128.138.232.79 AS104 University of Colorado at Boulder 1.73ms from Denver, US
198.59.51.5 AS104 University of Colorado at Boulder 1.84ms from Denver, US
128.138.138.121 AS104 University of Colorado at Boulder 1.99ms from Denver, US
2620:18f:0:10a0::1 AS104 University of Colorado at Boulder 0.54ms from Denver, US
128.138.81.254 AS104 University of Colorado at Boulder 1.36ms from Denver, US
192.12.244.18 AS104 University of Colorado at Boulder 1.21ms from Denver, US
198.59.55.10 AS104 University of Colorado at Boulder 0.57ms from Denver, US
128.138.82.253 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
71.192.18.248 AS7922 Comcast Cable Communications, LLC 10.15ms from Boston, US
75.161.185.248 AS209 CenturyLink Communications, LLC 8.90ms from Denver, US
98.55.33.8 AS7922 Comcast Cable Communications, LLC 4.86ms from Denver, US
52.176.80.56 AS8075 Microsoft Corporation 0.20ms from Des Moines, US
217.250.39.248 AS3320 Deutsche Telekom AG 2.72ms from Frankfurt am Main, DE
14.184.158.8 AS45899 VNPT Corp 3.34ms from Ho Chi Minh City, VN
81.141.58.184 AS2856 British Telecommunications PLC 6.52ms from London, GB
159.8.189.88 AS36351 IBM Cloud 1.09ms from London, GB
128.53.168.40 AS2514 NTT PC Communications, Inc. 2.42ms from Osaka, JP
218.226.101.24 AS9997 Suzuka Cable Co.,Ltd 3.13ms from Osaka, JP
54.197.77.136 AS14618 Amazon.com, Inc. 0.43ms from Reston, US
95.67.131.136 AS12389 PJSC Rostelecom 0.70ms from Samara, RU
75.46.55.168 AS7018 AT&T Enterprises, LLC 14.26ms from San Antonio, US
175.124.198.152 AS9318 SK Broadband Co Ltd 0.93ms from Seoul, KR
98.173.137.136 AS22773 Cox Communications Inc. 0.67ms from Ashburn, US
35.161.141.152 AS16509 Amazon.com, Inc. 0.22ms from Boardman, US
24.133.41.136 AS47524 Turksat Uydu Haberlesme Kablo TV ve Isletme A.S. 3.21ms from Istanbul, TR
110.38.218.168 AS38264 National WiMAX/IMS environment 19.14ms from Karachi, PK
217.41.67.104 AS2856 British Telecommunications PLC 2.63ms from London, GB
82.2.67.168 AS5089 Virgin Media Limited 4.97ms from London, GB
96.40.179.104 AS20115 Charter Communications LLC 8.89ms from Los Angeles, US
79.219.186.40 AS3320 Deutsche Telekom AG 3.99ms from Munich, DE
62.118.154.40 AS8359 MTS PJSC 4.48ms from Saint Petersburg, RU
109.231.18.136 AS34525 KOBA Sp. z o.o. 2.70ms from Warsaw, PL
34.59.70.216 AS396982 Google LLC 0.13ms from Council Bluffs, US

Traceroute

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

$
traceroute -a -n -q1 -f3 128.138.214.41
traceroute to 128.138.214.41 (128.138.214.41): 64 hops max, 52 byte packets
4 [AS104] 198.59.55.9 1.393 ms
5 [AS104] 128.138.81.194 3.512 ms
7 [AS104] 128.138.81.15 1.673 ms
8 [AS104] 128.138.82.15 1.805 ms
9 [AS104] 128.138.214.41 1.381 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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