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
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

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

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

IP Address	ASN	Details
131.215.245.254	AS31 California Institute of Technology	`1.43ms` from Los Angeles, US
131.215.244.254	AS31 California Institute of Technology	`1.50ms` 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
134.207.137.55	AS5058 Navy Network Information Center (NNIC)	`2.71ms` from Ashburn, US
204.0.140.119	AS6079 RCN	`1.80ms` from Ashburn, US
170.185.145.23	AS11686 Zayo Bandwidth	`14.17ms` from Atlanta, US
97.219.178.119	AS6167 Verizon Business	`10.36ms` from Atlanta, US
181.58.198.151	AS10620 Telmex Colombia S.A.	`14.54ms` from Bogota, CO
173.22.147.231	AS30036 Mediacom Communications Corp	`17.23ms` from Chicago, US
63.180.222.103	AS16509 Amazon.com, Inc.	`0.18ms` from Frankfurt am Main, DE
60.163.205.215	AS4134 CHINANET-BACKBONE	`8.72ms` from Hangzhou, CN
116.110.242.55	AS24086 Viettel Corporation	`9.56ms` from Ho Chi Minh City, VN
180.188.188.247	AS10118 Hutchison Telephone Company Limited	`13.75ms` from Hong Kong, HK
182.229.27.55	AS17858 LG POWERCOMM	`1.71ms` from Incheon, KR
185.187.186.215	AS201863 Star of Bosphorus Bilgi Teknolojiler San ve Tic A.S.	`2.02ms` from Istanbul, TR
42.202.143.71	AS134762 CHINANET Liaoning province Dalian MAN network	`4.61ms` from Liaoyang, CN
98.176.142.167	AS22773 Cox Communications Inc.	`8.34ms` from Los Angeles, US
24.2.53.199	AS7922 Comcast Cable Communications, LLC	`7.17ms` from Santa Clara, US
14.54.226.199	AS4766 Korea Telecom	`3.08ms` from Seoul, KR
213.232.26.7	AS12296 ADA-NET Internet ve Iletisim Hizmetleri Tic. A.S.	`5.01ms` from Ankara, TR
46.246.250.231	AS1241 Forthnet	`1.98ms` from Athens, GR
41.46.68.103	AS8452 TE-AS	`8.45ms` from Cairo, EG
108.86.166.103	AS7018 AT&T Enterprises, LLC	`8.88ms` from Chicago, US
45.228.121.119	AS267061 Microtec Telecomunicação Ltda - ME	`8.50ms` from Curitiba, BR
99.81.137.151	AS16509 Amazon.com, Inc.	`0.27ms` from Dublin, IE
189.45.97.247	AS28270 Alares_Internet	`1.13ms` from Fortaleza, BR
140.246.62.55	AS58519 Cloud Computing Corporation	`0.28ms` from Guiyang, CN
171.255.243.199	AS7552 Viettel Group	`3.85ms` from Hanoi, VN

Traceroute

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

traceroute -a -n -q1 -f4 131.215.244.254

traceroute to 131.215.244.254 (131.215.244.254): 64 hops max, 52 byte packets

4 [AS13335] 141.101.72.102 1.841 ms

5 [AS13335] 172.64.216.71 0.817 ms

6 [AS13335] 172.64.216.62 0.921 ms

7 [AS13335] 172.64.216.66 0.979 ms

8 *

9 [AS31] 131.215.219.29 1.521 ms

10 [AS31] 131.215.219.9 1.542 ms

11 [AS31] 131.215.244.254 1.602 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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