cellobservatory.org Cellobservatory.org

   
Cell Observatory: visualising structures of life - Leiden University

Domain Summary

What IP addresses does Cellobservatory.org resolve to?

• Cellobservatory.org resolves to the IP addresses 5.157.87.204.

Where are Cellobservatory.org servers located in?

• Cellobservatory.org has servers located in The Netherlands.

cellobservatory.org Profile

Title:Cell Observatory: visualising structures of life - Leiden University Description:From molecule, to cell, to organism. The high-level drug research at the Cell Observatory aimes at reducing the spread of *** and developing new medicines for tuberculosis.
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What technologies does cellobservatory.org use?

These are the technologies used at cellobservatory.org. cellobservatory.org has a total of 5 technologies installed in 5 different categories.
CMS
Bloomreach Bloomreach
Tag Managers
Google Tag Manager Google Tag Manager
Security
HSTS HSTS
Programming Languages
Java Java
Miscellaneous
Open Graph Open Graph

cellobservatory.org Traffic Analysis

There's no enough data about cellobservatory.org traffic.
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Monthly Visits n/a
Pages per Visit n/a
Visit duration n/a
Bounce Rate n/a
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Monthly Visits:
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Global Reach:
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HypeRank:
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*All traffic values are estimates only.

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Domain:
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Rank:
(Rank based on keywords, cost and organic traffic)
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Organic Keywords:
(Number of keywords in top 20 Google SERP)
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Organic Traffic:
(Number of visitors coming from top 20 search results)
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Organic Cost:
((How much need to spend if get same number of visitors from Google Adwords)
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Ad Experience Report ▼

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

Mobile summary

Root domain:
cellobservatory.org
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.)
Not reviewed

Desktop summary

Root domain:
cellobservatory.org
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.)
Not reviewed

Abusive Experience Report ▼

Summary of the abusive experience rating of a website.
Root domain:
cellobservatory.org
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.)
Not reviewed

Where is cellobservatory.org hosted? ▼

Cellobservatory.org may be hosted in multiple data centers distributed in different locations around the world. This is probably just one of them.
Server IP:
5.157.87.204
ASN:
AS48635 
ISP:
Astralus B.V. 
Server Location:

The Netherlands, NL
 

Other sites hosted on 5.157.87.204

How fast does cellobservatory.org load? ▼

The average loading time of cellobservatory.org is 328 ms. The Desktop speed index is 93 and mobile speed index is 51.
Average Load Time:
328 ms

Page Speed (Google PageSpeed Insights) - Desktop

93
0-49 50-89 90-100 i

Field Data

Over the last 30 days, the field data shows that this page has a FAST 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.

Cumulative Layout Shift (CLS)3ms 83% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 83% 12% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 12% 4% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 4%
Time To First Byte (TTFB)773ms 75% of loads for this page have a fast (<0.8s) Time To First Byte (TTFB) 75% 18% of loads for this page have an average (0.8s ~ 1.8s) Time To First Byte (TTFB) 18% 5% of loads for this page have a slow (>1.8s) Time To First Byte (TTFB) 5%
First Contentful Paint (FCP)1.0s 90% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 90% 6% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 6% 2% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 2%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average (0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interaction To Next Paint (INP)47ms 98% of loads for this page have a fast (<200ms) Interaction To Next Paint (INP) 98% 1% of loads for this page have an average (200ms ~ 500ms) Interaction To Next Paint (INP) 1% 0% of loads for this page have a slow (>500ms) Interaction To Next Paint (INP) 0%
Largest Contentful Paint (LCP)1.2s 93% of loads for this page have a fast (<2500ms) Largest Contentful Paint (LCP) 93% 4% of loads for this page have an average (2500ms ~ 4000ms) Largest Contentful Paint (LCP) 4% 2% of loads for this page have a slow (>4000ms) Largest Contentful Paint (LCP) 2%

Origin Data

All pages served from this origin have an FAST 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.

Cumulative Layout Shift (CLS)3ms 83% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 83% 12% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 12% 4% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 4%
Time To First Byte (TTFB)773ms 75% of loads for this page have a fast (<0.8s) Time To First Byte (TTFB) 75% 18% of loads for this page have an average (0.8s ~ 1.8s) Time To First Byte (TTFB) 18% 5% of loads for this page have a slow (>1.8s) Time To First Byte (TTFB) 5%
First Contentful Paint (FCP)1.0s 90% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 90% 6% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 6% 2% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 2%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average 0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interaction To Next Paint (INP)47ms 98% of loads for this page have a fast (<200ms) Interaction To Next Paint (INP) 98% 1% of loads for this page have an average (200ms ~ 500ms) Interaction To Next Paint (INP) 1% 0% of loads for this page have a slow (>500ms) Interaction To Next Paint (INP) 0%
Largest Contentful Paint (LCP)1.2s 93% of loads for this page have a fast (<2500ms) Largest Contentful Paint (LCP) 93% 4% of loads for this page have an average (2500ms ~ 4000ms) Largest Contentful Paint (LCP) 4% 2% of loads for this page have a slow (>4000ms) Largest Contentful Paint (LCP) 2%

Lab Data

Max Potential First Input Delay 150 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
Speed Index 0.9 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric
Time to Interactive 2.0 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
First Contentful Paint 0.9 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more about the First Contentful Paint metric
Total Blocking Time 130 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
Largest Contentful Paint 1.4 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric
INP breakdown  
Start investigating by looking at the longest subpart. how to improve INP

Page Speed (Google PageSpeed Insights) - Mobile

51
0-49 50-89 90-100 i

Field Data

Over the last 30 days, the field data shows that this page has a AVERAGE 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.

Cumulative Layout Shift (CLS)15ms 83% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 74% 1% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 1% 24% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 24%
Time To First Byte (TTFB)995ms 75% of loads for this page have a fast (<800s) Time To First Byte (TTFB) 69% 20% of loads for this page have an average (800s ~ 1800s) Time To First Byte (TTFB) 20% 9% of loads for this page have a slow (>1800s) Time To First Byte (TTFB) 9%
First Contentful Paint (FCP)1.3s 90% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 84% 8% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 8% 6% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 6%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average (0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interactive To Next Paint (INP)126ms 98% of loads for this page have a fast (<200s) Interactive To Next Paint (INP) 90% 8% of loads for this page have an average (200s ~ 500s) Interactive To Next Paint (INP) 8% 0% of loads for this page have a slow (>500s) Interactive To Next Paint (INP) 0%
Largest Contentful Paint (LCP)1.5s 93% of loads for this page have a fast (<2500s) Largest Contentful Paint (LCP) 89% 6% of loads for this page have an average (2500s ~ 4000s) Largest Contentful Paint (LCP) 6% 4% of loads for this page have a slow (>4000s) Largest Contentful Paint (LCP) 4%

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.

Cumulative Layout Shift (CLS)15ms 74% of loads for this page have a fast (<0.01s) Cumulative Layout Shift (CLS) 74% 1% of loads for this page have an average (0.01s ~ 0.025s) Cumulative Layout Shift (CLS) 1% 24% of loads for this page have a slow (>0.025s) Cumulative Layout Shift (CLS) 24%
Time To First Byte (TTFB)995ms 69% of loads for this page have a fast (<0.8s) Time To First Byte (TTFB) 69% 20% of loads for this page have an average (0.8s ~ 1.8s) Time To First Byte (TTFB) 20% 9% of loads for this page have a slow (>1.8s) Time To First Byte (TTFB) 9%
First Contentful Paint (FCP)1.3s 84% of loads for this page have a fast (<1.8s) First Contentful Paint (FCP) 84% 8% of loads for this page have an average (1.8s ~ 3s) First Contentful Paint (FCP) 8% 6% of loads for this page have a slow (>3s) First Contentful Paint (FCP) 6%
First Input Delay (FID)0 0% of loads for this page have a fast (<0ms) First Input Delay (FID) 0% 0% of loads for this page have an average 0ms ~ 0ms) First Input Delay (FID) 0% 0% of loads for this page have a slow (>0ms) First Input Delay (FID) 0%
Interactive To Next Paint (INP)126ms 90% of loads for this page have a fast (<0.2s) Interactive To Next Paint (INP) 90% 8% of loads for this page have an average (0.2s ~ 0.5s) Interactive To Next Paint (INP) 8% 0% of loads for this page have a slow (>0.5s) Interactive To Next Paint (INP) 0%
Largest Contentful Paint (LCP)1.5s 89% of loads for this page have a fast (<2.5s)Largest Contentful Paint (LCP) 89% 6% of loads for this page have an average (2.5s ~ 4s)Largest Contentful Paint (LCP) 6% 4% of loads for this page have a slow (>4s)Largest Contentful Paint (LCP) 4%

Lab Data

Speed Index 7.8 s
Speed Index shows how quickly the contents of a page are visibly populated. Learn more about the Speed Index metric
Time to Interactive 11.1 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
Largest Contentful Paint 11.1 s
Largest Contentful Paint marks the time at which the largest text or image is painted. Learn more about the Largest Contentful Paint metric
Total Blocking Time 290 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
INP breakdown  
Start investigating by looking at the longest subpart. how to improve INP
Max Potential First Input Delay 170 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
First Contentful Paint 6.8 s
First Contentful Paint marks the time at which the first text or image is painted. Learn more about the First Contentful Paint metric
LCP request discovery  
by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading Optimize LCP

Does cellobservatory.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 cellobservatory.org are reduced by 73%.
cellobservatory.org use gzip compression.
Original size: 22.79 KB
Compressed size: 6.15 KB
File reduced by: 16.63 KB (73%)

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.
Status:
  SAFE

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. cellobservatory.org supports HTTPS.
 cellobservatory.org supports HTTPS
     
Verifying SSL Support. Please wait...
Common Name: cms.universiteitleiden.nl
Organization: Universiteit Leiden
Location: Leiden, NL
Issuer: GEANT TLS RSA 1
Valid from: Aug 18 15:20:10 2025 GMT
Valid until: Aug 18 15:20:10 2026 GMT
Authority:
Keysize: 4096 Bits
Common Name: GEANT TLS RSA 1
Organization: Hellenic Academic and Research Institutions CA
Location: GR
Issuer: HARICA TLS RSA Root CA 2021
Valid from: Jan 3 11:15:00 2025 GMT
Valid until: Dec 31 11:14:59 2039 GMT
Authority: CA:TRUE
Keysize: 3072 Bits
Common Name: HARICA TLS RSA Root CA 2021
Organization: Hellenic Academic and Research Institutions CA
Location: GR
Issuer: Hellenic Academic and Research Institutions RootCA 2015
Valid from: Sep 2 07:41:55 2021 GMT
Valid until: Aug 31 07:41:54 2029 GMT
Authority: CA:TRUE
Keysize: 4096 Bits

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.
 cellobservatory.org does not support HTTP/2
     
Verifying HTTP/2.0 Support. Please wait...

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. 
server: nginx/1.20.1
date: Fri, 06 Feb 2026 09:49:01 GMT
content-type: text/html; charset=UTF-8
location: https://www.universiteitleiden.nl/en/science/cell-observatory
x-powered-by: PHP/7.1.30

HTTP/1.1 200 OK
Access-Control-Allow-Methods: GET
Access-Control-Allow-Origin: *
Access-Control-Max-Age: 3600
Content-Encoding: gzip
Content-Security-Policy: frame-ancestors 'self' https://leidenuniv.libwizard.com https://library-tutorials.leidenuniv.nl https://brightspace.universiteitleiden.nl
Content-Type: text/html;charset=UTF-8
Date: Fri, 06 Feb 2026 09:49:02 GMT
Referrer-Policy: strict-origin-when-cross-origin, strict-origin
Set-Cookie: ROUTEID=fc810d00411d05ef; Path=/; HttpOnly; Secure; SameSite=Strict
Set-Cookie: JSESSIONID=5A26813E692D9BB66BB8BB31A4AF96A5; Max-Age=43200; Expires=Fri, 06 Feb 2026 21:49:01 GMT; Path=/; Secure; HttpOnly; SameSite=Lax
Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
Vary: Origin
X-Content-Type-Options: nosniff
X-Xss-Protection: 1; mode=block
Transfer-Encoding: chunked
X-FRAME-OPTIONS: SAMEORIGIN

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 5.157.87.204 100
MX server24.firstfind.nl 100
NS ns3.firstfind.nl 100
NS ns4.firstfind.nl 100
NS ns5.firstfind.net 100
SOA 100
Mname ns3.firstfind.nl
Rname hostmaster.firstfind.nl
Serial Number 2019020502
Refresh 16384
Retry 2048
Expire 1048576
Minimum TTL 14400