Autonomous System details

AS31

California Institute of Technology  ·  caltech.edu

United States

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AS31 – California Institute of Technology

Field Value
Country United States
Website caltech.edu
Hosted domains 99
IPv4 addresses 131,840
IPv6 addresses 79,228,162,514,264,337,593,543,950,336
ASN type Education
Registry arin
Allocated 41 years ago on Sep 21, 1984
Updated 2 years ago on Aug 29, 2023

IP Ranges

Netblock Company Num of IPs
131.215.0.0/16 California Institute of Technology 65,536
134.4.0.0/16 California Institute of Technology 65,536
131.215.242.0/23 California Institute of Technology 512
131.215.244.0/23 California Institute of Technology 512
131.215.229.0/24 California Institute of Technology 256
131.215.230.0/24 California Institute of Technology 256
131.215.234.0/24 California Institute of Technology 256
131.215.239.0/24 California Institute of Technology 256
131.215.240.0/24 California Institute of Technology 256
192.12.19.0/24 California Institute of Technology 256
192.31.43.0/24 California Institute of Technology 256
192.41.208.0/24 California Institute of Technology 256

Netblock Company
2607:f520::/32 California Institute of Technology
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WHOIS Details

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                                                ASHandle:       AS31
                                                OrgID:          AS31
                                                ASName:         AS31
                                                ASNumber:       AS31
                                                RegDate:        0000-00-00
                                                Updated:        0000-00-00
                                                TechHandle:     AA00-AAAA
                                                Source:         AAAA
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Hosted Domains

There are 99 domain names hosted across 57 IP addresses on this ASN.

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IP Address Domain Domains on this IP
131.215.239.20 ██████████ 7
131.215.140.111 ██████████ 6
134.4.74.17 ██████████ 6
131.215.242.9 ██████████ 6
131.215.198.54 ██████████ 5
131.215.66.188 ██████████ 4
131.215.113.72 ██████████ 3
131.215.76.24 ██████████ 3
131.215.176.71 █████████ 3
131.215.5.239 ██████████ 3

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Peers

There are 3 peers for this ASN.

Peers Name
AS13335 Cloudflare, Inc.
AS2152 CENIC
AS2153 CENIC
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ASN API & Database

Upstreams

There are 2 upstreams for this ASN.

upstreams Name
AS13335 Cloudflare, Inc.
AS2152 CENIC
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ASN API & Database

Downstreams

There are no downstreams for this ASN.

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ASN API & Database

Pingable IPs

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

IP Address ASN Details
131.215.152.254 AS31 California Institute of Technology 0.93ms from Los Angeles, US
131.215.6.192 AS31 California Institute of Technology 0.89ms from Los Angeles, US
131.215.4.183 AS31 California Institute of Technology 0.89ms from Los Angeles, US
131.215.9.95 AS31 California Institute of Technology 0.86ms from Los Angeles, US
131.215.21.171 AS31 California Institute of Technology 0.86ms from Los Angeles, US
131.215.102.254 AS31 California Institute of Technology 0.87ms from Los Angeles, US
131.215.169.254 AS31 California Institute of Technology 0.89ms from Los Angeles, US
131.215.125.200 AS31 California Institute of Technology 0.86ms from Los Angeles, US
131.215.220.4 AS31 California Institute of Technology 0.76ms from Los Angeles, US
131.215.14.152 AS31 California Institute of Technology 0.86ms from Los Angeles, US
131.215.67.44 AS31 California Institute of Technology 0.91ms from Los Angeles, US
131.215.120.254 AS31 California Institute of Technology 0.88ms from Los Angeles, US
131.215.191.254 AS31 California Institute of Technology 0.87ms from Los Angeles, US
131.215.218.255 AS31 California Institute of Technology 0.82ms from Los Angeles, US
131.215.165.254 AS31 California Institute of Technology 0.88ms from Los Angeles, US
131.215.237.36 AS31 California Institute of Technology 0.87ms from Los Angeles, US
131.215.110.203 AS31 California Institute of Technology 0.92ms from Los Angeles, US
131.215.62.254 AS31 California Institute of Technology 0.87ms from Los Angeles, US
131.215.231.51 AS31 California Institute of Technology 0.88ms from Los Angeles, US
131.215.119.198 AS31 California Institute of Technology 0.85ms from Los Angeles, US
131.215.132.138 AS31 California Institute of Technology 0.86ms from Los Angeles, US
131.215.79.131 AS31 California Institute of Technology 0.86ms from Los Angeles, US
131.215.18.254 AS31 California Institute of Technology 0.88ms from Los Angeles, US
131.215.3.254 AS31 California Institute of Technology 0.87ms from Los Angeles, US
131.215.219.10 AS31 California Institute of Technology 0.74ms 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
35.90.36.15 AS16509 Amazon.com, Inc. 0.49ms from Boardman, US
62.235.45.159 AS5432 Proximus NV 2.42ms from Brussels, BE
117.239.244.191 AS9829 National Internet Backbone 9.33ms from Chennai, IN
172.101.77.31 AS11351 Charter Communications Inc 19.12ms from Chicago, US
174.24.123.95 AS209 CenturyLink Communications, LLC 2.62ms from Denver, US
4.208.194.15 AS8075 Microsoft Corporation 0.18ms from Dublin, IE
115.64.101.31 AS7545 TPG Telecom Limited 1.27ms from Melbourne, AU
37.213.15.31 AS6697 Republican Unitary Telecommunication Enterprise Beltelecom 5.27ms from Minsk, BY
67.174.247.63 AS7922 Comcast Cable Communications, LLC 6.29ms from San Jose, US
199.11.90.111 AS1802 Cogent Communications, LLC 0.32ms from Secaucus, US
123.174.35.239 AS4134 CHINANET-BACKBONE 9.44ms from Taiyuan, CN
31.181.134.15 AS12389 PJSC Rostelecom 16.44ms from Tbilisi, GE
84.111.231.255 AS8551 Bezeq International Ltd. 1.24ms from Tel Aviv, IL
118.155.197.31 AS2516 KDDI CORPORATION 0.67ms from Tokyo, JP
120.74.212.175 AS2527 Sony Network Communications Inc. 6.18ms from Tokyo, JP
100.26.212.223 AS14618 Amazon.com, Inc. 0.96ms from Ashburn, US
23.234.111.223 AS11878 tzulo, inc. 0.21ms from Atlanta, US
221.217.210.223 AS4808 China Unicom Beijing Province Network 3.42ms from Beijing, CN
34.255.246.31 AS16509 Amazon.com, Inc. 0.20ms from Dublin, IE
47.70.91.63 AS3209 Vodafone GmbH 15.10ms from Duesseldorf, DE
18.157.160.31 AS16509 Amazon.com, Inc. 0.33ms from Frankfurt am Main, DE
138.124.186.143 AS215540 GLOBAL CONNECTIVITY SOLUTIONS LLP 0.66ms from Frankfurt am Main, DE
117.4.131.79 AS7552 Viettel Group 3.52ms from Hanoi, VN
76.172.36.207 AS20001 Charter Communications Inc 5.37ms from Honolulu, US
78.186.185.127 AS9121 Turk Telekomunikasyon Anonim Sirketi 1.29ms from Istanbul, TR

Traceroute

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

$
traceroute -a -n -q1 -f4 131.215.42.232
traceroute to 131.215.42.232 (131.215.42.232): 64 hops max, 52 byte packets
4 [AS2152] 204.102.224.2 0.529 ms
5 [AS2152] 137.164.3.75 0.893 ms
6 [AS31] 131.215.219.25 0.764 ms
7 [AS31] 131.215.219.9 0.83 ms
8 [AS31] 131.215.218.3 0.917 ms
9 [AS31] 131.215.42.232 1.098 ms
Measurement taken from IPinfo ProbeNet in Los Angeles, US
On

Related Networks

What is an ASN?

Autonomous System Numbers (ASNs) are assigned to entities such as Internet Service Providers and other large organizations that control blocks of IP addresses. This network page, and the organization field that's shown on the main IP address information page and also returned in the geolocation API are based on the ASN.

The ASN details will often correspond to the IP address owner, but for smaller organizations it may be that organization's parent, or their ISP. Find out more about AS31 at robtex.

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