131.215.242.0/23

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
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 131.215.242.0/23

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

Nearby Ranges

BGP prefixes that overlap with 131.215.0.0/16

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

Hosted domains

There are 13 domain names hosted across 4 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
131.215.242.9	aboutdgabaldon.com	9
131.215.242.43	brianlau.com	2
131.215.242.33	fanrank.net	1
131.215.242.46	multistrand.org	1

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

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

IP Address	ASN	Details
131.215.243.254	AS31 California Institute of Technology	`1.57ms` from Los Angeles, US
131.215.242.254	AS31 California Institute of Technology	`1.52ms` 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
107.135.226.183	AS7018 AT&T Enterprises, LLC	`9.07ms` from Atlanta, US
148.59.89.135	AS21527 Daystarr Communications	`3.20ms` from Detroit, US
114.145.86.151	AS4713 NTT DOCOMO BUSINESS,Inc.	`6.57ms` from Osaka, JP
34.202.132.103	AS14618 Amazon.com, Inc.	`0.19ms` from Reston, US
189.53.196.103	AS4230 CLARO S.A.	`1.25ms` from Sao Paulo, BR
59.21.21.135	AS4766 Korea Telecom	`6.51ms` from Seoul, KR
183.121.145.7	AS4766 Korea Telecom	`7.81ms` from Seoul, KR
119.195.114.103	AS4766 Korea Telecom	`6.44ms` from Seoul, KR
168.235.251.7	AS53587 AZURE TECHNOLOGY CO., LIMITED	`0.46ms` from Singapore, SG
220.143.149.199	AS3462 Data Communication Business Group	`4.02ms` from Taichung, TW
192.145.36.103	AS136787 PacketHub S.A.	`0.08ms` from Tokyo, JP
71.60.168.7	AS7922 Comcast Cable Communications, LLC	`10.39ms` from Ashburn, US
76.118.22.215	AS7922 Comcast Cable Communications, LLC	`5.39ms` from Boston, US
193.62.45.71	AS786 Jisc Services Limited	`6.44ms` from Chester, GB
92.23.24.167	AS13285 TalkTalk Communications Limited	`4.77ms` from London, GB
117.221.38.55	AS9829 National Internet Backbone	`14.16ms` from Saint Thomas Mount, IN
92.255.242.7	AS41786 JSC ER-Telecom Holding	`8.45ms` from Samara, RU
170.247.13.71	AS52714 Firemicro Informática	`18.42ms` from Sao Paulo, BR
211.107.10.23	AS4766 Korea Telecom	`1.88ms` from Seoul, KR
134.102.23.7	AS680 Verein zur Foerderung eines Deutschen Forschungsnetzes e.V.	`12.67ms` from Berlin, DE
184.19.56.247	AS5650 Frontier Communications of America, Inc.	`7.39ms` from Chicago, US
12.106.172.71	AS7018 AT&T Enterprises, LLC	`5.48ms` from Chicago, US
75.109.167.135	AS19108 Optimum	`15.32ms` from Dallas, US
27.45.170.39	AS17816 China Unicom IP network China169 Guangdong province	`4.23ms` from Guangzhou, CN
203.198.142.183	AS4760 HKT Limited	`1.26ms` from Hong Kong, HK

Traceroute

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

traceroute -a -n -q1 -f3 131.215.243.254

traceroute to 131.215.243.254 (131.215.243.254): 64 hops max, 52 byte packets

3 [] 138.199.0.107 0.221 ms

4 *

5 [AS13335] 141.101.72.19 1.676 ms

6 [AS13335] 172.70.205.91 0.676 ms

7 [AS13335] 172.70.205.63 0.815 ms

8 [AS13335] 172.70.205.84 0.811 ms

9 *

10 [AS31] 131.215.219.25 1.469 ms

11 [AS31] 131.215.219.9 1.509 ms

12 [AS31] 131.215.243.254 1.736 ms

Measurement taken from

IPinfo ProbeNet in Los Angeles, US

On January 19th 2026

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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