131.215.244.0/23

AS31 · California Institute of Technology

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Summary

Country	United States
Domain	caltech.edu
ASN	AS31
Parent Range	131.215.0.0/16
Registry	ARIN
ID	CALTECH-NET

WHOIS Details

NetHandle:      NET-131-215-0-0-1
OrgID:          CIT-4-Z
Parent:         NET-131-0-0-0-0
NetName:        CALTECH-NET
NetRange:       131.215.0.0 - 131.215.255.255
NetType:        allocation
OriginAS:       31
RegDate:        1989-01-19
Updated:        2023-08-29
TechHandle:     CI2-ORG-ARIN
AbuseHandle:    CI2-ORG-ARIN
NOCHandle:      CI2-ORG-ARIN
Source:         ARIN


OrgID:          CIT-4-Z
OrgName:        California Institute of Technology
CanAllocate:    
Street:         1200 East California Boulevard
Street:         MS 1-10
City:           Pasadena
State/Prov:     CA
Country:        US
PostalCode:     91125
RegDate:        2023-08-22
Updated:        2023-08-22
OrgAdminHandle: CI2-ORG-ARIN
OrgTechHandle:  CI2-ORG-ARIN
OrgAbuseHandle: CI2-ORG-ARIN
Source:         ARIN


POCHandle:      CI2-ORG-ARIN
IsRole:         Y
LastName:       Caltech Network Operations Center
FirstName:      
Street:         1200 East California Boulevard
Street:         MS 1-10
City:           Pasadena
State/Prov:     CA
Country:        US
PostalCode:     91125
RegDate:        1998-07-29
Updated:        2025-07-22
OfficePhone:    +1-626-395-3500
Mailbox:        noc@caltech.edu
Source:         ARIN

Overlapping Ranges

BGP prefixes that contain 131.215.244.0/23

Range	ASN	Company	Num of IPs
131.215.0.0/16	AS31	California Institute of Technology	65,536

Hosted domains

There are no domains currently hosted on this ASN.

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

Read more

Pingable IPs

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

IP Address	ASN	Details
131.215.244.254	AS31 California Institute of Technology	`1.63ms` from Los Angeles, US
131.215.245.254	AS31 California Institute of Technology	`1.63ms` from Los Angeles, 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
181.90.92.135	AS7303 Telecom Argentina S.A.	`1.74ms` from Buenos Aires, AR
20.68.106.119	AS8075 Microsoft Corporation	`0.17ms` from Cardiff, GB
98.222.7.71	AS7922 Comcast Cable Communications, LLC	`10.07ms` from Chicago, US
87.177.79.135	AS3320 Deutsche Telekom AG	`8.08ms` from Frankfurt am Main, DE
193.29.57.199	AS48314 Michael Sebastian Schinzel trading as IP-Projects GmbH & Co. KG	`0.49ms` from Frankfurt am Main, DE
67.169.191.71	AS7922 Comcast Cable Communications, LLC	`5.07ms` from Fremont, US
129.173.36.215	AS8111 Dalhousie University	`0.36ms` from Halifax, CA
47.96.68.7	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`5.19ms` from Hangzhou, CN
188.30.98.247	AS206067 Hutchison 3G UK Limited	`19.83ms` from London, GB
87.11.36.119	AS3269 Telecom Italia S.p.A.	`6.33ms` from Milan, IT
73.198.59.23	AS7922 Comcast Cable Communications, LLC	`5.62ms` from New York City, US
125.4.54.55	AS9617 JCOM Co., Ltd.	`7.68ms` from Osaka, JP
136.25.32.55	AS19165 Webpass Inc.	`1.41ms` from Santa Clara, US
146.155.181.71	AS20191 Pontificia Universidad Catolica de Chile	`1.29ms` from Santiago, CL
46.12.193.247	AS1241 Forthnet	`9.45ms` from Sofia, BG
183.173.77.55	AS4538 China Education and Research Network Center	`5.55ms` from Tianjin, CN
194.135.81.23	AS212531 Interneto vizija	`0.75ms` from Vilnius, LT
182.113.35.183	AS4837 CHINA UNICOM China169 Backbone	`6.04ms` from Zhengzhou, CN
69.230.222.7	AS135629 Ningxia West Cloud Data Technology Co.Ltd.	`0.49ms` from Zhongwei, CN
20.62.158.23	AS8075 Microsoft Corporation	`0.41ms` from Ashburn, US
114.249.105.55	AS4808 China Unicom Beijing Province Network	`3.29ms` from Beijing, CN
73.227.252.71	AS7922 Comcast Cable Communications, LLC	`6.59ms` from Boston, US
20.94.12.247	AS8075 Microsoft Corporation	`0.29ms` from Boydton, US
49.177.213.39	AS4804 Microplex PTY LTD	`5.41ms` from Brisbane, AU
46.182.150.135	AS15451 DATEV eG	`3.49ms` from Frankfurt am Main, DE

Traceroute

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

traceroute -a -n -q1 -f5 131.215.245.254

traceroute to 131.215.245.254 (131.215.245.254): 64 hops max, 52 byte packets

5 [] 198.32.160.195 1.885 ms

6 [AS13335] 162.158.61.101 1.61 ms

7 [AS13335] 108.162.218.98 1.664 ms

8 [AS13335] 108.162.218.102 1.766 ms

9 [AS13335] 108.162.218.113 1.432 ms

10 *

11 [AS31] 131.215.219.25 73.39 ms

12 [AS31] 131.215.219.9 73.388 ms

13 [AS31] 131.215.219.1 73.393 ms

14 [AS31] 131.215.219.5 73.344 ms

15 [AS31] 131.215.245.254 73.341 ms

Measurement taken from

IPinfo ProbeNet in Piscataway, 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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