198.59.51.0/24

AS104 · University of Colorado at Boulder

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Summary

Country	United States
Domain	colorado.edu
ASN	AS104
Registry	ARIN
ID	UCB-2-Z

WHOIS Details

NetHandle:      NET-198-59-51-0-1
OrgID:          UCB-2-Z
Parent:         NET-198-0-0-0-0
NetName:        UCB-2-Z
NetRange:       198.59.51.0 - 198.59.52.255
NetType:        allocation
RegDate:        1993-02-09
Updated:        2021-12-14
Source:         ARIN


OrgID:          UCB-2-Z
OrgName:        University of Colorado Boulder
CanAllocate:    
Street:         Office of Information Technology 
Street:         3645 Marine Street
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0455
RegDate:        2019-05-13
Updated:        2019-06-25
OrgAdminHandle: CUBOU-ARIN
OrgTechHandle:  CUBOU-ARIN
OrgAbuseHandle: ABUSE306-ARIN
Source:         ARIN


POCHandle:      ABUSE306-ARIN
IsRole:         Y
LastName:       Abuse
FirstName:      
Street:         Information Technology Services
Street:         3645 Marine Street
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0455
RegDate:        2003-05-27
Updated:        2025-07-22
OfficePhone:    +1-303-735-4357
Mailbox:        abuse@colorado.edu
Source:         ARIN


POCHandle:      CUBOU-ARIN
IsRole:         Y
LastName:       CUBoulder
FirstName:      
Street:         3645 Marine Street
Street:         Campus Box 455
City:           Boulder
State/Prov:     CO
Country:        US
PostalCode:     80309-0445
RegDate:        2011-11-11
Updated:        2025-07-14
OfficePhone:    +1-303-735-4357
Mailbox:        arinadmin@colorado.edu
Source:         ARIN

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

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Useful for Cybersecurity

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Pingable IPs

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

IP Address	ASN	Details
198.59.51.5	AS104 University of Colorado at Boulder	`1.89ms` 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
193.121.218.120	AS5432 Proximus NV	`5.93ms` from Amsterdam, NL
172.210.18.152	AS8075 Microsoft Corporation	`0.99ms` from Ashburn, US
69.233.2.168	AS7018 AT&T Enterprises, LLC	`6.59ms` from Atlanta, US
192.91.75.24	AS161 Texas Instruments Incorporated	`1.66ms` from Dallas, US
109.199.118.56	AS51167 Contabo GmbH	`1.16ms` from Duesseldorf, DE
58.253.75.136	AS17816 China Unicom IP network China169 Guangdong province	`7.92ms` from Guangzhou, CN
223.235.227.232	AS24560 Bharti Airtel Ltd., Telemedia Services	`14.99ms` from Kolkata, IN
38.54.98.232	AS138915 Kaopu Cloud HK Limited	`0.29ms` from Kuala Lumpur, MY
66.24.36.136	AS11351 Charter Communications Inc	`14.07ms` from New York City, US
126.110.235.136	AS17676 SoftBank Corp.	`10.91ms` from Osaka, JP
98.82.67.200	AS14618 Amazon.com, Inc.	`0.19ms` from Reston, US
40.112.233.152	AS8075 Microsoft Corporation	`0.58ms` from San Jose, US
49.174.45.104	AS17858 LG POWERCOMM	`2.01ms` from Seoul, KR
47.102.57.56	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`4.44ms` from Shanghai, CN
80.216.255.136	AS1257 Tele2 Sverige AB	`8.11ms` from Stockholm, SE
13.48.34.232	AS16509 Amazon.com, Inc.	`0.11ms` from Stockholm, SE
178.190.86.168	AS8447 A1 Telekom Austria AG	`1.14ms` from Vienna, AT
50.71.174.72	AS6327 Shaw Communications Inc.	`18.32ms` from Chicago, US
3.254.237.8	AS16509 Amazon.com, Inc.	`0.58ms` from Dublin, IE
86.131.127.168	AS2856 British Telecommunications PLC	`4.66ms` from London, GB
213.229.92.168	AS29550 Team Blue Carrier Limited	`1.53ms` from London, GB
94.9.79.120	AS5607 Sky UK Limited	`6.30ms` from London, GB
87.220.167.8	AS12479 Orange Espagne SA	`10.40ms` from Madrid, ES
34.154.2.72	AS396982 Google LLC	`0.93ms` from Milan, IT
146.235.54.152	AS31898 Oracle Corporation	`0.16ms` from Sao Paulo, BR

Traceroute

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

traceroute -a -n -q1 -f3 198.59.51.22

traceroute to 198.59.51.22 (198.59.51.22): 64 hops max, 52 byte packets

3 [] 206.53.175.22 0.619 ms

4 [AS104] 198.59.55.9 1.327 ms

5 [AS104] 128.138.81.194 3.649 ms

6 [AS104] 128.138.81.249 2.403 ms

7 [AS104] 128.138.81.131 3.399 ms

8 [AS104] 128.138.82.22 2.887 ms

9 *

10 [AS104] 198.59.51.22 2.466 ms

Measurement taken from

IPinfo ProbeNet in Denver, US

On September 11th 2025

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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