131.215.229.0/24

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 131.215.229.0/24

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 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

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

IP Address	ASN	Details
131.215.229.254	AS31 California Institute of Technology	`1.39ms` 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
2.84.135.168	AS6799 Ote SA (Hellenic Telecommunications Organisation)	`0.87ms` from Athens, GR
114.245.215.200	AS4808 China Unicom Beijing Province Network	`3.78ms` from Beijing, CN
177.207.82.8	AS18881 TELEFÔNICA BRASIL S.A	`1.11ms` from Fortaleza, BR
18.155.141.120	AS16509 Amazon.com, Inc.	`0.08ms` from Hamburg, DE
121.125.74.104	AS9318 SK Broadband Co Ltd	`1.03ms` from Incheon, KR
24.71.226.88	AS6327 Shaw Communications	`4.27ms` from Kelowna, CA
2.101.41.120	AS13285 TalkTalk Communications Limited	`1.18ms` from Manchester, GB
111.80.118.120	AS17421 Mobile Business Group	`6.93ms` from Taipei, TW
221.232.176.40	AS4134 CHINANET-BACKBONE	`1.50ms` from Wuhan, CN
223.75.116.120	AS9808 China Mobile Communications Group Co., Ltd.	`4.59ms` from Wuhan, CN
45.117.6.216	AS12975 PALTEL Autonomous System	`8.65ms` from Amman, JO
213.174.132.120	AS39572 DataWeb Global Group B.V.	`0.20ms` from Ashburn, US
59.110.37.8	AS37963 Hangzhou Alibaba Advertising Co.,Ltd.	`2.06ms` from Beijing, CN
63.131.173.72	AS14140 Auburn Essential Services	`9.87ms` from Columbus, US
216.83.62.168	AS16509 Amazon.com, Inc.	`0.15ms` from Columbus, US
169.238.66.216	AS54804 CableSouth Media III LLC	`13.29ms` from Dallas, US
58.186.101.104	AS18403 FPT Telecom Company	`0.56ms` from Hanoi, VN
189.191.167.232	AS8151 UNINET	`1.09ms` from Mexico City, MX
47.192.47.88	AS5650 Frontier Communications of America, Inc.	`12.61ms` from Miami, US
86.245.106.152	AS3215 Orange S.A.	`4.37ms` from Paris, FR
71.227.137.104	AS7922 Comcast Cable Communications, LLC	`5.71ms` from Seattle, US
106.10.210.168	AS56173 internet content provider	`0.61ms` from Singapore, SG
195.172.97.40	AS9009 M247 Europe SRL	`0.20ms` from Singapore, SG
99.227.51.72	AS812 Rogers Communications Canada Inc.	`4.32ms` from Toronto, CA
217.68.85.104	AS206808 HEP-TELEKOMUNIKACIJE d.o.o.	`4.41ms` from Zagreb, HR

Traceroute

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

traceroute -a -n -q1 -f4 131.215.229.24

traceroute to 131.215.229.24 (131.215.229.24): 64 hops max, 52 byte packets

4 [AS13335] 141.101.72.102 1.345 ms

5 [AS13335] 172.64.216.95 0.834 ms

6 [AS13335] 172.64.216.79 0.912 ms

7 [AS13335] 172.64.216.40 0.975 ms

8 *

9 [AS31] 131.215.219.29 1.44 ms

10 [AS31] 131.215.219.9 1.568 ms

11 [AS31] 131.215.239.254 1.67 ms

12 [AS31] 131.215.229.24 15.747 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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