clevelandclinic.org Clevelandclinic.org

   
Cleveland Clinic: Every Life Deserves World Class Care

Domain Summary

What is the traffic rank for Clevelandclinic.org?

• Clevelandclinic.org ranks #2,197 globally on HypeStat.

What percent of global Internet users visit Clevelandclinic.org?

0.0470972% of global Internet users visit Clevelandclinic.org

How many people visit Clevelandclinic.org each day?

• Clevelandclinic.org receives approximately 2.3M visitors and 4,091,336 page impressions per day.

Which countries does Clevelandclinic.org receive most of its visitors from?

• Clevelandclinic.org is mostly visited by people located in United States,Canada,United Kingdom.

How much Clevelandclinic.org can earn?

• Clevelandclinic.org should earn about $18,326.07/day from advertising revenue.

What is Clevelandclinic.org estimated value?

• Estimated value of Clevelandclinic.org is $20,481,882.93.

What IP addresses does Clevelandclinic.org resolve to?

• Clevelandclinic.org resolves to the IP addresses 192.35.79.223.

Where are Clevelandclinic.org servers located in?

• Clevelandclinic.org has servers located in Maple Heights, Ohio, 44137, United States.

clevelandclinic.org Profile

Title:Cleveland Clinic: Every Life Deserves World Class Care
Description:Cleveland Clinic, a non-profit academic medical center, provides clinical and hospital care and is a leader in research, education and health information.
Category:Health / Medicine
About: Offers health and specialty information, research and clinical trials, news, and educational programs.
Cleveland Clinic, a non-profit academic medical center, provides clinical and hospital care and is a leader in research, education and health information. Edit Site Info

What technologies does clevelandclinic.org use?

These are the technologies used at clevelandclinic.org. clevelandclinic.org has a total of 10 technologies installed in 8 different categories.

clevelandclinic.org Traffic Analysis

Clevelandclinic.org is ranked #2,197 in the world. This website is viewed by an estimated 2.3M visitors daily, generating a total of 4.1M pageviews. This equates to about 70.4M monthly visitors. Clevelandclinic.org traffic has increased by 6.31% compared to last month.
Daily Visitors2.3M
2.05%
Monthly Visits70.4M
6.31%
Pages per Visit1.76
3.62%
Visit duration01:25
14.92%
Bounce Rate76.61%
1.4%
Is this your site?Verify your site's metrics.
Daily Unique Visitors:
2,321,856
Monthly Visits:
70,352,237
Pages per Visit:
1.76
Daily Pageviews:
4,091,336
Avg. visit duration:
01:25
Bounce rate:
76.61%
Global Reach:
0.0470972%
Monthly Visits (SEMrush):
92,756,680
Monthly Unique Visitors (SEMrush):
65,903,010
Monthly Visits (SimilarWeb):
71,077,239
HypeRank:
2,197
SEMrush Rank:
41
SimilarWeb Rank:
924
*All traffic values are estimates only.

Traffic sources

Direct:
19.38%
Referral:
6.95%
Search:
73.10%
Social:
0.57%
Paid:
0.01%

Desktop vs Mobile

Desktop:
21.54%
Mobile:
78.46%

Total Visits Last 3 Months

63.2M
FEB
66.2M
MAR
70.4M
APR

Visitors by country

Country
Users%
 
United States 64.61%
 
Canada 5.38%
 
United Kingdom 4.25%
 
India 4.09%
 
Australia 2.70%

Where do visitors go on clevelandclinic.org?

 
Reach%Pageviews%PerUser
my.clevelandclinic.org
59.92%55.64%1.4
health.clevelandclinic.org
32.77%26.89%1.2
mychart.clevelandclinic.org
5.60%13.77%3.7
consultqd.clevelandclinic.org
1.50%1.06%1.1
jobs.clevelandclinic.org
1.14%1.01%1

Which sites are competitors to clevelandclinic.org?

Websites similar to clevelandclinic.org are sites similar on user interests and browsing behavior. Users can discover new websites that are similar to the ones they already enjoy or find useful.
Last update was 417 days ago
     
This can take up to 60 seconds. Please wait...

*HypeStat.com is not promoting or affiliated with clevelandclinic.org in any way. Only publicly available statistics data are displayed.

Search Engine Indexes

Search engine indexes are huge databases or collections of net pages that search engines like google like google and yahoo use to retrieve applicable facts while customers carry out searches. These indexes are created through search engines like google and yahoo through crawling and indexing net pages from throughout the internet.
Google Index:
91,000
Bing Index:
207,000

 

SEMrush is a complete on line advertising and marketing platform that gives a extensive variety of gear and functions to help companies and entrepreneurs in enhancing their on line visibility and optimizing their virtual advertising and marketing strategies.
SemRushSemRush
Domain:
  clevelandclinic.org
Rank:
(Rank based on keywords, cost and organic traffic)
  41
Organic Keywords:
(Number of keywords in top 20 Google SERP)
  8,791,053
Organic Traffic:
(Number of visitors coming from top 20 search results)
  61,055,209
Organic Cost:
((How much need to spend if get same number of visitors from Google Adwords)
  $60,400,973.00

Revenue report

Google.com would generate approximately $18.3K per day if the source of income were advertisements, which equates to an estimated monthly revenue of $549.8K and annual gross revenue of approximately $6.7M. Based on these figures, the site's net worth is estimated at around $20.5M.

How much would clevelandclinic.org make?

Daily Revenue:
$18,326.07
Monthly Revenue:
$549,782.10
Yearly Revenue:
$6,689,015.55
*All earnings values are estimates only.

Daily earning by country

 
CountryPageviewsEarning
 
United States 2,643,467$12,767.95
 
Canada 220,000$1,328.80
 
Australia 110,550$532.85
 
United Kingdom 173,936$466.15
 
India 167,211$63.54

Loss of money due to Adblock?

Daily Revenue Loss:
$2,829.38
Monthly Revenue Loss:
$84,881.26
Yearly Revenue Loss:
$1,032,722.01
Daily Pageviews Blocked:
627,583
Monthly Pageviews Blocked:
18,827,489
Yearly Pageviews Blocked:
229,067,779

Daily revenue loss by country

 
CountryBlockedLost Money
 
United States 475,824$2,298.23
 
Canada 55,000$332.20
 
Australia 22,110$106.57
 
United Kingdom 27,830$74.58
 
India 46,819$17.79

How much is clevelandclinic.org worth?

Website Value:
$20.5M

Ad Experience Report

Summary of the ad experience rating of a website for a specific platform.

Mobile summary

Root domain:
clevelandclinic.org
Last Change Time:
(The last time that the site changed status.)
2019-02-05 13:06:20
Ad filtering:
(Chrome is not filtering ads on your site.)
Off
Status:
(The status of the site that is reviewed for the Better Ads Standards.)
Passing

Desktop summary

Root domain:
clevelandclinic.org
Last Change Time:
(The last time that the site changed status.)
2019-02-05 13:06:20
Ad filtering:
(Chrome is not filtering ads on your site.)
Off
Status:
(The status of the site that is reviewed for the Better Ads Standards.)
Passing

Abusive Experience Report

Summary of the abusive experience rating of a website.
Root domain:
clevelandclinic.org
Last Change Time:
(The last time that the site changed status.)
2019-02-05 13:06:20
Enforcement:
(Chrome is not preventing your site from opening new windows or tabs.)
Off
Status:
(The status of the site reviewed for the abusive experiences.)
Passing

Where is clevelandclinic.org hosted?

Clevelandclinic.org may be hosted in multiple data centers distributed in different locations around the world. This is probably just one of them.
Server IP:
192.35.79.223
ASN:
AS22093 
ISP:
Cleveland Clinic Foundation 
Server Location:
Maple Heights
Ohio, OH
44137
United States, US
 

Other sites hosted on 192.35.79.223

How fast does clevelandclinic.org load?

The average loading time of clevelandclinic.org is 336 ms. The Desktop speed index is 91 and mobile speed index is 28.
Average Load Time:
336 ms

Page Speed (Google PageSpeed Insights) - Desktop

91
0-49 50-89 90-100 i

Field Data

Over the last 30 days, the field data shows that this page has a SLOW speed compared to other pages in the Chrome User Experience Report.We are showing the 90th percentile of FCP and the 95th percentile of FID.

First Contentful Paint (FCP)4.7s 23% of loads for this page have a fast (<1s) First Contentful Paint (FCP) 23% 41% of loads for this page have an average (1s ~ 2.5s) First Contentful Paint (FCP) 41% 34% of loads for this page have a slow (>2.5s) First Contentful Paint (FCP) 34%
First Input Delay (FID)8ms 98% of loads for this page have a fast (<50ms) First Input Delay (FID) 98% 0% of loads for this page have an average (50ms ~ 250ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>250ms) First Input Delay (FID) 0%

Origin Data

All pages served from this origin have an SLOW speed compared to other pages in the Chrome User Experience Report. over the last 30 days.To view suggestions tailored to each page, analyze individual page URLs.

First Contentful Paint (FCP)5.1s 18% of loads for this page have a fast (<1s) First Contentful Paint (FCP) 18% 39% of loads for this page have an average (1s ~ 2.5s) First Contentful Paint (FCP) 39% 41% of loads for this page have a slow (>2.5s) First Contentful Paint (FCP) 41%
First Input Delay (FID)35ms 96% of loads for this page have a fast (<50ms) First Input Delay (FID) 96% 2% of loads for this page have an average 50ms ~ 250ms) First Input Delay (FID) 2% 1% of loads for this page have a slow (>250ms) First Input Delay (FID) 1%

Lab Data

Max Potential First Input Delay 20 ms
The maximum potential First Input Delay that your users could experience is the duration, in milliseconds, of the longest task. Learn more
Time to Interactive 1.2 s
Time to interactive is the amount of time it takes for the page to become fully interactive. Learn more
Estimated Input Latency 10 ms
Estimated Input Latency is an estimate of how long your app takes to respond to user input, in milliseconds, during the busiest 5s window of page load. If your latency is higher than 50 ms, users may perceive your app as laggy. Learn more
Total Blocking Time 0 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds.
Speed Index 1.5 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more
First CPU Idle 1.2 s
First CPU Idle marks the first time at which the page's main thread is quiet enough to handle input. Learn more
First Contentful Paint 1.1 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more
Performance budget  
Keep the quantity and size of network requests under the targets set by the provided performance budget. Learn more
First Meaningful Paint 1.2 s
First Meaningful Paint measures when the primary content of a page is visible. Learn more

Page Speed (Google PageSpeed Insights) - Mobile

28
0-49 50-89 90-100 i

Field Data

Over the last 30 days, the field data shows that this page has a SLOW speed compared to other pages in the Chrome User Experience Report.We are showing the 90th percentile of FCP and the 95th percentile of FID.

First Contentful Paint (FCP)1.5s 23% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 82% 11% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 11% 5% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 5%
First Input Delay (FID)16ms 92% of loads for this page have a fast (<100ms) First Input Delay (FID) 92% 5% of loads for this page have an average (100ms ~ 300ms) First Input Delay (FID) 5% 2% of loads for this page have a slow (>300ms) First Input Delay (FID) 2%

Origin Data

All pages served from this origin have an AVERAGE speed compared to other pages in the Chrome User Experience Report. over the last 30 days.To view suggestions tailored to each page, analyze individual page URLs.

First Contentful Paint (FCP)1.8s 76% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 76% 15% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 15% 8% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 8%
First Input Delay (FID)17ms 96% of loads for this page have a fast (<100ms) First Input Delay (FID) 90% 5% of loads for this page have an average 100ms ~ 300ms) First Input Delay (FID) 5% 3% of loads for this page have a slow (>300ms) First Input Delay (FID) 3%

Lab Data

Time to Interactive 24.3 s
Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric
Lazy load third-party resources with facades  
Some third-party embeds can be lazy loaded. Consider replacing them with a facade until they are required. Learn how to defer third-parties with a facade
Performance budget  
Keep the quantity and size of network requests under the targets set by the provided performance budget. Learn more about performance budgets
Largest Contentful Paint image was not lazily loaded  
Above-the-fold images that are lazily loaded render later in the page lifecycle, which can delay the largest contentful paint. Learn more about optimal lazy loading
Timing budget  
Set a timing budget to help you keep an eye on the performance of your site. Performant sites load fast and respond to user input events quickly. Learn more about performance budgets
Total Blocking Time 3,020 ms
Sum of all time periods between FCP and Time to Interactive, when task length exceeded 50ms, expressed in milliseconds. Learn more about the Total Blocking Time metric
First Contentful Paint 3.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more about the First Contentful Paint metric
Preconnect to required origins  
Consider adding `preconnect` or `dns-prefetch` resource hints to establish early connections to important third-party origins. Learn how to preconnect to required origins
Speed Index 4.6 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric
First Meaningful Paint 3.8 s
First Meaningful Paint measures when the primary content of a page is visible. Learn more about the First Meaningful Paint metric
Preload Largest Contentful Paint image  
If the LCP element is dynamically added to the page, you should preload the image in order to improve LCP. Learn more about preloading LCP elements
Max Potential First Input Delay 1,830 ms
The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric
Has a `<meta name="viewport">` tag with `width` or `initial-scale`  
A `<meta name="viewport">` not only optimizes your app for mobile screen sizes, but also prevents . a 300 millisecond delay to user input Learn more about using the viewport meta tag
Largest Contentful Paint 3.9 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric

Does clevelandclinic.org use compression?

Website compression is the process of reducing the size of website files, such as HTML, CSS, JavaScript, and image files, to improve website performance and load times. Compressing website files can significantly reduce the amount of data that needs to be transferred from the server to the user's browser, resulting in faster page load times and improved user experience. Files on clevelandclinic.org are reduced by 71%.
clevelandclinic.org use br compression.
Original size: 73.6 KB
Compressed size: 21.19 KB
File reduced by: 52.41 KB (71%)

Google Safe Browsing

Google Safe Browsing is a service provided by Google that helps protect users from visiting websites that may contain malicious or harmful content, such as malware, phishing attempts, or deceptive software.
This site is not currently listed as suspicious

MyWot.com Reputation Ratings

MyWOT (short for "My Web of Trust") is a web-based reputation and rating service that provides users with information about the trustworthiness and safety of websites. clevelandclinic.org has 84 Safety Reputations.
Status:
  SAFE
Safety Reputations:
  84
Safety Confidence:
  9

SSL Checker - SSL Certificate Verify

An SSL (Secure Sockets Layer) certificate is a digital certificate that establishes a secure encrypted connection between a web server and a user's web browser. It provides authentication and encryption, ensuring that data transmitted between the server and the browser remains private and protected. clevelandclinic.org supports HTTPS.
 clevelandclinic.org supports HTTPS
     
Verifying SSL Support. Please wait...
Common Name: clevelandclinic.org
Organization: "Cloudflare, Inc."
Location: San Francisco, California, US
Issuer: Cloudflare Inc ECC CA-3
Valid from: May 23 00:00:00 2023 GMT
Valid until: May 22 23:59:59 2024 GMT
Authority: CA:FALSE
Keysize:
Common Name: Cloudflare Inc ECC CA-3
Organization: "Cloudflare, Inc."
Location: US
Issuer: Baltimore CyberTrust Root
Valid from: Jan 27 12:48:08 2020 GMT
Valid until: Dec 31 23:59:59 2024 GMT
Authority: CA:TRUE
Keysize:

Verify HTTP/2 Support

HTTP/2 (Hypertext Transfer Protocol version 2) is a major revision of the HTTP protocol, which is the foundation of data communication on the World Wide Web. It was developed as an improvement over the previous HTTP/1.1 version to enhance web performance and efficiency.
 clevelandclinic.org supports HTTP/2
     
Verifying HTTP/2.0 Support. Please wait...

Site Categories

Website categories are used to classify websites based on their content or purpose. These categories provide a way to organize and filter websites, allowing users to find relevant information or ensure compliance with specific regulations or policies.
United States/Ohio
Health/Hospitals

Http Header

HTTP headers are extra portions of records despatched among a consumer (which include an internet browser) and a server at some stage in an HTTP request or response. They offer instructions, metadata, or manipulate parameters for the conversation among the consumer and server.
content-type: text/html; charset=UTF-8
location: https://my.clevelandclinic.org
date: Tue, 23 May 2023 02:44:23 GMT
content-length: 153
x-generator: unknown
x-xss-protection: 1; mode=block
age: 6

HTTP/2 200 
date: Tue, 23 May 2023 02:44:29 GMT
content-type: text/html; charset=utf-8
cache-control: public
x-frame-options: SAMEORIGIN
content-security-policy: frame-ancestors http://*.ccf.org https://*.ccf.org https://clevelandclinic.ungerboeck.com https://*.clevelandclinic.org http://*.clevelandclinic.org
arr: 52
x-generator: unknown
x-xss-protection: 1; mode=block
age: 3
cf-cache-status: DYNAMIC
set-cookie: __cf_bm=q2NpVHX4U2HcKmL0pk0neGPAQ3gfoY3G8_cIdqz9eEQ-1684809869-0-Ad5WA6WbreN160Q7N84R4RsecfFM8o9Tt7ez+5I3ZmakwCeIeOre2eRP1ENloXv6RHyWBbZLt54zxy+f2cvFSpU=; path=/; expires=Tue, 23-May-23 03:14:29 GMT; domain=.clevelandclinic.org; HttpOnly; Secure; SameSite=None
strict-transport-security: max-age=15552000; includeSubDomains; preload
x-content-type-options: nosniff
server: cloudflare
cf-ray: 7cb9f5140be91119-ORD
content-encoding: br
alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400

DNS Lookup

DNS entries (Domain Name System) are a critical component of the Internet infrastructure. They act as directories that translate human-readable domain names (such as example.com) to machine-readable IP addresses. DNS records are stored on DNS servers and help forward internet traffic efficiently.
Type Ip Target/Txt TTL
A 192.35.79.223 3541
TXT vZDYsw8mvEaAKUOOQV0AiSUAKcumtLY8gnaetoVvFfDatRSItRpXDv8Tpnr7Zk9WAKdfMNfvvcMRUWA6wY894A== 3541
TXT facebook-domain-verification=3lrbkbzm0s2x1t20o5zbm9e8tlaqd5 3541
TXT d365mktkey=6vnv94i0t2irkvtbnd7t9qlg5 3541
TXT d365mktkey=69fhnrl1ynapps6shvxrngv3m 3541
TXT d365mktkey=28sa7bafpe2de8vpiioj7eyhf 3541
TXT d365mktkey=3gwph51api0dfr21luukz4df7 3541
TXT d365mktkey=bdnrgug1lm2owwuuv3wofe3j 3541
TXT 7f576db0-d122-4e47-8a99-2393581c66e5 3541
TXT MS=ms25572796 3541
TXT ca3-1f8d9fa12bd148fb95769f650b99b8cd 3541
TXT v=spf1 include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:spf.constantcontact.com ip4:192.35.79.108 ip4:192.35.79.200 ip4:192.35.79.198 ip4:192.28.148.57 ~all 3541
MX us-smtp-inbound-1.mimecast.com 3541
MX us-smtp-inbound-2.mimecast.com 3541
SOA 3541
Mname cr-dc-02-dcaw12-2200-ib1.ccf.org
Rname ip-admin.ccf.org
Serial Number 2012042300
Refresh 10800
Retry 3600
Expire 2419200
Minimum TTL 900
NS ns5.ccf.org 3540
NS ns4.ccf.org 3540

Whois Lookup

Domain WHOIS is a public database that provides information about domain names, including registered owners, contact information, domain registrars, registration and expiration dates, name servers, and other relevant information. Domain registration for this website began on January 8, 1998 and will expire on January 7, 2024 if not renewed. This website is now assigned through the registrar GoDaddy.com, LLC. The WHOIS data for this website's domain was last updated on September 20, 2022.
Domain Created:
1998-01-08
Domain Expires:
2024-01-07
Domain Updated:
2022-09-20
Domain Age:
26 years 6 months 5 days
Domain Registrar:
GoDaddy.com, LLC
Domain Owner:
Domains By Proxy, LLC
WhoIs:
 

Domain Name: clevelandclinic.org
Registry Domain ID: 01af7004a8e04e64a062ce03e3fb2b32-LROR
Registrar WHOIS Server: http://whois.godaddy.com
Registrar URL: http://www.whois.godaddy.com
Updated Date: 2022-09-20T17:33:45Z
Creation Date: 1998-01-08T05:00:00Z
Registry Expiry Date: 2024-01-07T05:00:00Z
Registrar: GoDaddy.com, LLC
Registrar IANA ID: 146
Registrar Abuse Contact Email: email
Registrar Abuse Contact Phone: +1.4806242505
Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
Domain Status: clientRenewProhibited https://icann.org/epp#clientRenewProhibited
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
Registry Registrant ID: REDACTED FOR PRIVACY
Registrant Name: REDACTED FOR PRIVACY
Registrant Organization: Domains By Proxy, LLC
Registrant Street: REDACTED FOR PRIVACY
Registrant City: REDACTED FOR PRIVACY
Registrant State/Province: Arizona
Registrant Postal Code: REDACTED FOR PRIVACY
Registrant Country: US
Registrant Phone: REDACTED FOR PRIVACY
Registrant Phone Ext: REDACTED FOR PRIVACY
Registrant Fax: REDACTED FOR PRIVACY
Registrant Fax Ext: REDACTED FOR PRIVACY
Registrant Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Registry Admin ID: REDACTED FOR PRIVACY
Admin Name: REDACTED FOR PRIVACY
Admin Organization: REDACTED FOR PRIVACY
Admin Street: REDACTED FOR PRIVACY
Admin City: REDACTED FOR PRIVACY
Admin State/Province: REDACTED FOR PRIVACY
Admin Postal Code: REDACTED FOR PRIVACY
Admin Country: REDACTED FOR PRIVACY
Admin Phone: REDACTED FOR PRIVACY
Admin Phone Ext: REDACTED FOR PRIVACY
Admin Fax: REDACTED FOR PRIVACY
Admin Fax Ext: REDACTED FOR PRIVACY
Admin Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Registry Tech ID: REDACTED FOR PRIVACY
Tech Name: REDACTED FOR PRIVACY
Tech Organization: REDACTED FOR PRIVACY
Tech Street: REDACTED FOR PRIVACY
Tech City: REDACTED FOR PRIVACY
Tech State/Province: REDACTED FOR PRIVACY
Tech Postal Code: REDACTED FOR PRIVACY
Tech Country: REDACTED FOR PRIVACY
Tech Phone: REDACTED FOR PRIVACY
Tech Phone Ext: REDACTED FOR PRIVACY
Tech Fax: REDACTED FOR PRIVACY
Tech Fax Ext: REDACTED FOR PRIVACY
Tech Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.
Name Server: ns4.ccf.org
Name Server: ns5.ccf.org
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of WHOIS database: 2023-05-23T02:45:28Z