Caltech.edu Home | www.caltech.edu

The California Institute of Technology aims to expand human knowledge and benefit society through research integrated with education.

Caltech.edu Quick Summary

Status

Online

Server IP address resolved: Yes

Http response code: 200

Response time: 0.24 sec.

Last Checked: 03/18/2025

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Caltech.edu traffic estimate is about 30,279 unique visitors and 83,267 pageviews per day. The approximated value of caltech.edu is 1,090,620 USD. Every unique visitor makes about 2.75 pageviews on average.

Alexa Traffic Rank estimates that caltech.edu is ranked number 880 in the world, while most of its traffic comes from United States, where it occupies as high as 3,229 place.

It’s good for caltech.edu that their hosting company AMAZON-02 - Amazon.com, Inc., US is located in United States, as that provides the majority of their visitors to benefit from the faster page load time. See the list of other websites hosted by AMAZON-02 - Amazon.com, Inc., US.

Caltech.edu is registered under .EDU top-level domain. Check other websites in .EDU zone.

During the last check (October 13, 2024) caltech.edu has a valid and up-to-date SSL certificate issued by Internet2 that expires on June 03, 2025, please click the “Refresh” button for SSL Information at the Safety Information section. Check other websites using SSL certificates issued by Internet2.

In accordance with Google Safe Browsing, Google Safe Search, Symantec and Web of Trust caltech.edu is pretty a safe domain.

Relying on Google Mobile-Friendly test caltech.edu is well optimized for mobile and tablet devices, however website page loading time may be improved.

Caltech.edu General Information

Caltech.edu Audience Geography

Where are website visitors coming from?

Visitors
Pageviews
Ranks

Country	Visitors
United States US	38.6%
China CN	15.3%
India IN	11.2%
Korea KR	2.6%
United Kingdom GB	2.3%
France FR	2.2%
Japan JP	2%
Germany DE	1.8%
Australia AU	1.6%
Other	22.2%

Country	Rank
United States US	3229
Switzerland CH	4077
India IN	4592
South Africa ZA	4825
Nigeria NG	4952
Australia AU	5449
China CN	5469
Korea KR	6070
Mexico MX	6620
Philippines PH	6669
Pakistan PK	6972
France FR	9320

Caltech.edu Traffic Distribution

Where do visitors go on caltech.edu?

Subdomain Traffic
Views per User
Subdomain Reach

Subdomain	Pageviews
ipac.caltech.edu	11.03%
feynmanlectures.caltech.edu	6.01%
scedc.caltech.edu	5.62%
library.caltech.edu	5.36%
caltech.edu	4.48%
skipper.caltech.edu	3.89%
ligo.caltech.edu	3.76%
access.caltech.edu	2.67%
vision.caltech.edu	2.65%
other	54.59%

Subdomain	Views per User
skipper.caltech.edu	18
crust.caltech.edu	7.6
enroll.caltech.edu	7
lists.caltech.edu	7
mycaltechhealth.caltech.edu	6
noir.caltech.edu	5
tccon-wiki.caltech.edu	4.6
housing.caltech.edu	4
help.caltech.edu	4
ahweb.caltech.edu	4
other	2.06

Subdomain	Reach
ipac.caltech.edu	12.78%
library.caltech.edu	11.4%
caltech.edu	8.08%
scedc.caltech.edu	7.81%
feynmanlectures.caltech.edu	5.87%
cds.caltech.edu	3.69%
vision.caltech.edu	3.54%
its.caltech.edu	3.26%
cms.caltech.edu	3.12%
spitzer.caltech.edu	2.7%
other	50.76%

Caltech.edu Popularity

How popular is caltech.edu?

Global Rank
Pageviews
Reach

Period	Global Rank	Global Rank Delta
past 3 months	8163	1881
past month	8287	308
past week	8039	650
yesterday	10564	2170

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	9850	2521	763	-28.3%	2.75	-5.172%
30	10369	982	721	-10.71%	2.61	-8.741%
7	10613	1076	71	-12.28%	2.4	-5.49%
1	14749	2759	54	-17.9%	2.2	0%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	8140	1796	103	-24.46%
30	8139	96	102	-2.15%
7	7690	497	110	-7.326%
1	9928	1989	84	-17.75%

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Caltech.edu Safety Information

Rankchart Summary

Safe

Updated: 03/18/2025

We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Safe

Updated: 03/21/2024

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Norton ConnectSafe evaluates websites for any unsafe and inapropriate content. The results are important for families with young children.

Google Safe Search

Safe

Updated: 10/11/2016

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SafeSearch works as a parental control tool to filter out any content that might be inappropriate for your children.

Google Safe Browsing

Safe

Malware not found

Phishing not detected

Unwanted software not found

Harmfull applications not found

Updated: 01/09/2019

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Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.

McAfee® WebAdvisor

Safe

Updated: 02/22/2021

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McAfee assesses caltech.edu for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze caltech.edu for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Child safety is very good

Updated: 01/09/2019

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The WOT calculates reputation of the caltech.edu. This reputation system receives ratings from users and information from third-party sources, assesses the caltech.edu for safety features and confirms, whether caltech.edu is suitable for children.

Caltech.edu SSL Information

Information about SSL/TLS certificates

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Domain	caltech.edu
Issuer Organization	Internet2
Issuer	InCommon RSA Server CA 2
Algorithm	RSA-SHA384
Valid form	06/03/2024
Expiration	06/03/2025
Signed	Certificate is not self signed
Additional Domains	caltech.edu admissions.caltech.edu aphms.caltech.edu bbe.caltech.edu biology.caltech.edu brinsonhub.caltech.edu caltech.info caltech.net caltech.org cms.caltech.edu cns.caltech.edu csa.caltech.edu eands.caltech.edu eas.caltech.edu ee.caltech.edu einstein.caltech.edu finaid.caltech.edu galcit.caltech.edu gps.caltech.edu hpc.caltech.edu hss.caltech.edu imss.caltech.edu jobs.caltech.edu lncrna.caltech.edu mayo.caltech.edu mems.caltech.edu ogc.caltech.edu quarantine.caltech.edu registermydevice.caltech.edu spamtrap.caltech.edu srl.caltech.edu studaff.caltech.edu techer.caltech.edu vis.caltech.edu vision.caltech.edu www.csa.caltech.edu www.srl.caltech.edu www.techer.caltech.edu

SSL Checker

Caltech.edu Server Information

Caltech.edu Server Location

Where website hosting server is located?

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Caltech.edu ASN Information

Information about IP address owner

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ASN ID: 16509

ASN Title: AMAZON-02 - Amazon.com, Inc., US

Updated: 07/16/2024

Raw ASN data:

Geolocation

ASN Lookup

Caltech.edu Domain Name Information

Caltech.edu DNS Information

Domain name service records

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A
MX
NS
TXT
SOA

Host	A Record	TTL
caltech.edu	52.26.125.194	300

Host	MX Record	Priority	TTL
caltech.edu	mx1.caltech.iphmx.com	10	43200
caltech.edu	mx2.caltech.iphmx.com	10	43200

Host	NS Record	TTL
caltech.edu	ns0090.secondary.cloudflare.com	43200
caltech.edu	ns0239.secondary.cloudflare.com	43200

Host	TXT Record	TTL
caltech.edu	1password-site-verification=VRLN67QMNNEPXIIREL6TDZABF4	3600
caltech.edu	MS=ms43712753	3600
caltech.edu	Y84qDmmAIPozyUoBIRWmXsFltoU2Pl8b8WGKPlqgz+1t5Db4z9H5ngaaCTq3TTaOK+SCPYUsGVlGn0wUzXNdow==	3600
caltech.edu	ZOOM_verify_a-Gb5-aqQgygEiKsnho63w	3600
caltech.edu	adobe-idp-site-verification=1e150df049a820e49156727d1b84c48a1ae11f66f87ad76d2cf30cb9d378acb6	3600
caltech.edu	amazonses:CBaUu/J2wBFtHuO9isUzHAXTnIWcN5RyPUBvggu7SNE=	3600
caltech.edu	amazonses:X9y0RbFXXvxu3ft83xg2e+YV++OUePTUSeCOdB3Chjg=	3600
caltech.edu	apple-domain-verification=KD7b3wNXe76BHRAV	3600
caltech.edu	iContact1389932	3600
caltech.edu	v=spf1 ip4:131.215.0.0/16 ip4:134.4.0.0/16 ip4:192.100.16.0/24 ip4:198.129.208.0/23 ip4:208.69.128.0/22 ip4:199.188.184.0/22 ip4:198.202.125.128/25 include:spf.protection.outlook.com include:sendgrid.net include:mktomail.com include:spf.dynect.net	3600

Caltech.edu Whois Information

Information about registered users or assignees of an Internet resource

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Raw WHOIS data:

Whois

DNS Lookup

Caltech.edu HTML Validation

Caltech.edu W3C HTML Markup Validation

HTML markup errors and warnings

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Errors:

A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.

A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.

Attribute “href” not allowed on element “div” at this point.

Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.

Bad value “300px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.

The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.

Element “ul” not allowed as child of element “h1” in this context. (Suppressing further errors from this subtree.)

Element “ul” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)

Warnings:

The “type” attribute for the “style” element is not needed and should be omitted.

The “type” attribute is unnecessary for JavaScript resources.

HTML Validator

Caltech.edu Desktop Performance

How Well Caltech.edu Performs On Desktops?

Website desktop performance and usability tips

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Speed
Resource Breakdown

Speed

58%

Enable compression

Optimize images

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Minify CSS

Minify JavaScript

Leverage browser caching

Updated: 06/13/2016

Caltech.edu Mobile Performance

How Optimized Is Caltech.edu for Mobile Devices?

Tips on speeding up mobile site performance

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Usability
Speed
Resource Breakdown

Usability

99%

Size tap targets appropriately

Updated: 12/03/2019

Caltech.edu Nearest Competitors

Estimated Nearest Competitors Of Caltech.edu

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securityfocus.com
mediawiki.org
discovery.com
dl.acm.org
ctvnews.ca
google.nl
wufoo.com
unl.edu
rs6.net
caltech.edu
google.com.au
ourworldindata.org
irishtimes.com
answers.com
service.weibo.com
space.com
moodle.com
bostonglobe.com
fedex.com
lg.com
iea.org

Caltech.edu URL Typos

Most common user URL mistypes for caltech.edu

www.caltech.com
www.caltech.net
www.caltech.org
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Text	166.8 KBytes
CSS	524.1 KBytes
Images	999.8 KBytes
HTML	87.9 KBytes
JavaScript	1.6 MBytes
Other	38.3 KBytes

Total Resources	142
Number of Hosts	9
Static Resources	39
JavaScript Resources	20
CSS Resources	4

CSS	404.0 KBytes
Images	6.6 MBytes
HTML	393.7 KBytes
JavaScript	1.2 MBytes
Other	76.4 KBytes