Codeforces.com Codeforces

Codeforces. Programming competitions and contests, programming community

Codeforces.com Overview

Codeforces.com is a website that provides programming competitions and contests for its users. It also has a programming community where participants can interact with each other and share their programming experiences. The website is hosted by Telia Company AB hosting and has a top-level domain of .COM. SSL for the website is issued by Let's Encrypt, which ensures secure data transmission on the platform.

The website has a considerable amount of traffic with 20624 unique users per day and 255737.6 pageviews. The site value is estimated to be around 3,363,840 US dollars. However, one critical question that needs to be addressed is whether the website is family-friendly or not.

A closer look at Codeforces.com shows that it is family-friendly. The platform's competitions and contests revolve around programming, and they do not discuss sensitive or explicit content. Although users may interact with each other in the community section, the website has a strict code of conduct that prohibits any inappropriate behaviour or language. The website's administrators usually monitor users' activities to ensure that they adhere to the website's policies. The website is also secure, and the SSL issued by Let's Encrypt ensures secure data transmission on the platform, hence protecting user’s information.

Regarding the website's structure, it has a clean and straightforward layout. From the homepage, users can access information on upcoming competitions and contests, view their programming status, access the community section, and also engage in other programming-related activities. The website features a user-friendly hall of fame that displays the top users' rankings. Additionally, it provides a leaderboard feature that lists users according to their contest ranking and usually gets updated every five minutes.

However, the website's page speed insight score is 43, which is relatively low. This score could be an indication that some of its pages are not optimized correctly, leading to slow loading speeds. Given that internet users tend to be impatient and leave sites that take too long to load, the website's management needs to improve its website’s loading speed to prevent users from leaving the website.

In conclusion, Codeforces.com is a family-friendly website that offers programming competitions, contests, and a supportive community for its patrons. Its structure is simple and easy to manoeuvre, though its page speed score needs improvement.

Codeforces.com Rank Summary

Global Rank

2,399

Average Load Time

1.37sec

Links In Count

807

Website Value

$3.4 M

Audience Geography. Where are codeforces.com visitors located?

Country	Visitors
China CN	30.9%
India IN	30.4%
Egypt EG	12.2%
Azerbaijan AZ	6.7%
United States US	4.7%
Bangladesh BD	2.3%
Viet Nam VN	2.3%
Iran IR	1.2%
Russian Federation RU	0.9%
Other	8.5%

Country	Pageviews
Egypt EG	24.8%
India IN	24.8%
China CN	23.2%
Azerbaijan AZ	14.9%
United States US	3.3%
Viet Nam VN	2.7%
Bangladesh BD	1.3%
Iran IR	1.2%
United Kingdom GB	0.5%
Other	3.3%

Country	Rank
Egypt EG	191
Azerbaijan AZ	417
Bangladesh BD	531
India IN	602
Viet Nam VN	758
China CN	1130
Romania RO	3191
Iran IR	4438
Saudi Arabia SA	6462
United Kingdom GB	7888
United States US	8409
Russian Federation RU	11403

Where do visitors go on codeforces.com?

Subdomain	Pageviews
codeforces.com	98.53%
polygon.codeforces.com	0.8%
m1.codeforces.com	0.28%
contest.codeforces.com	0.23%
other	0.15%

Subdomain	Pageviews per User
codeforces.com	14
polygon.codeforces.com	9.2
m1.codeforces.com	4
contest.codeforces.com	3

Subdomain	Reach
codeforces.com	99.71%
polygon.codeforces.com	1.23%
m1.codeforces.com	1.05%
contest.codeforces.com	0.97%

How popular is codeforces.com?

Period	Global Rank	Global Rank Delta
past 3 months	2399	-2761
past month	1872	-636
past week	1983	-83
yesterday	2194	318

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	959	-1581	552	93.8%	12.4	26%
30	692	-359	792	55%	14	20%
7	778	-143	716	14%	13	10%
1	807	71	72	-13.01%	15	0.6%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	3586	-3785	149	54%
30	2798	-913	180	30%
7	2937	-57	180	-0.33%
1	3335	498	160	-13.57%

Codeforces.com Website Safety

Overview

Last Updated: 12/25/2024

Overall result - codeforces.com is safe.

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

Last Updated: 03/21/2024

codeforces.com is safe.

Norton ConnectSafe evaluates codeforces.com for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 10/11/2016

codeforces.com is safe.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 01/09/2019

codeforces.com is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.

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

Site Advisor

Last Updated: 02/22/2021

codeforces.com is safe.

McAfee assesses codeforces.com 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 codeforces.com for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 01/09/2019

codeforces.com child safety is very good.

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

SSL Information

SSL Checker Tool

Domain	codeforces.com
Issuer Organization	Google Trust Services
Issuer	WE1
Algorithm	ecdsa-with-SHA256
Valid form	09/19/2024
Expiration	12/18/2024
Signed	Certificate is not self signed
Additional Domains	codeforces.com *.codeforces.com

Codeforces.com Rank History

Alexa Rank shows how popular codeforces.com is in comparison with other sites. The most popular site has Alexa Rank equals 1. If codeforces.com has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to codeforces.com and pageviews on codeforces.com over the past 3 months.

Codeforces.com Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 13335

ASN Title: CLOUDFLARENET - Cloudflare, Inc., US

Last Update: 07/16/2024

#
# ARIN WHOIS data and services are subject to the Terms of Use
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ASNumber: 13335
ASName: CLOUDFLARENET
ASHandle: AS13335
RegDate: 2010-07-14
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/autnum/13335

OrgName: Cloudflare, Inc.
OrgId: CLOUD14
Address: 101 Townsend Street
City: San Francisco
StateProv: CA
PostalCode: 94107
Country: US
RegDate: 2010-07-09
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/entity/CLOUD14

OrgTechHandle: ADMIN2521-ARIN
OrgTechName: Admin
OrgTechPhone: +1-650-319-8930
OrgTechEmail: rir@cloudflare.com
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OrgAbuseHandle: ABUSE2916-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-650-319-8930
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RNOCHandle: NOC11962-ARIN
RNOCName: NOC
RNOCPhone: +1-650-319-8930
RNOCEmail: noc@cloudflare.com
RNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RTechHandle: ADMIN2521-ARIN
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RAbuseHandle: ABUSE2916-ARIN
RAbuseName: Abuse
RAbusePhone: +1-650-319-8930
RAbuseEmail: abuse@cloudflare.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
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# If you see inaccuracies in the results, please report at
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Codeforces.com Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: CODEFORCES.COM
Registry Domain ID: 1551886546_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.gandi.net
Registrar URL: http://www.gandi.net
Updated Date: 2024-04-05T00:10:39Z
Creation Date: 2009-04-10T18:26:18Z
Registry Expiry Date: 2025-04-10T18:26:18Z
Registrar: Gandi SAS
Registrar IANA ID: 81
Registrar Abuse Contact Email: abuse@support.gandi.net
Registrar Abuse Contact Phone: +33.170377661
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: FRED.NS.CLOUDFLARE.COM
Name Server: JEAN.NS.CLOUDFLARE.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-09-10T23:44:19Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL
codeforces.com	77.234.215.195	21600

Host	MX Record	Priority	TTL
codeforces.com	codeforces.com	10	21600

Host	NS Record	TTL
codeforces.com	dns1.yandex.net	900
codeforces.com	dns2.yandex.net	900

Host	TXT Record	TTL
codeforces.com	loaderio=17e74635884b3872197928c7ea0123c5	21600
codeforces.com	v=spf1 a mx ip4:77.234.215.195 -all	21600

dns1.yandex.net
TTL: 900
Email address: dns-hosting.yandex.ru
Serial: 41
Refresh: 900
Retry: 90
Expire: 86400
Minimum: 900

Codeforces.com HTML Check

HTML Validation Tool

Errors

Obsolete doctype. Expected “<!DOCTYPE html>”.

Bad value “pragma” for attribute “http-equiv” on element “meta”.

Bad value “expires” for attribute “http-equiv” on element “meta”.

Bad value “profileName” for attribute “http-equiv” on element “meta”.

The “charset” attribute on the “link” element is obsolete. Use an HTTP Content-Type header on the linked resource instead.

An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.

Attribute “home” not allowed on element “span” at this point.

Attribute “noredirection” not allowed on element “span” at this point.

Attribute “textbeforeredirect” not allowed on element “span” at this point.

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

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

Element “option” without attribute “label” must not be empty.

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

Attribute “contestid” not allowed on element “a” at this point.

No “p” element in scope but a “p” end tag seen.

The “font” element is obsolete. Use CSS instead.

The “center” element is obsolete. Use CSS instead.

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

Attribute “pageindex” not allowed on element “span” at this point.

End tag for “body” seen, but there were unclosed elements.

Unclosed element “div”.

Warnings

The “type” attribute is unnecessary for JavaScript resources.

The “charset” attribute on the “script” element is obsolete.

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

This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.

Codeforces.com Desktop Performance

Last tested: 08/10/2016

Desktop Speed

78%

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

Minify JavaScript

Enable compression

Leverage browser caching

Optimize images

Desktop Resource Breakdown

Total Resources	96
Number of Hosts	13
Static Resources	85
JavaScript Resources	31
CSS Resources	23

Codeforces.com Mobile Insights

Last tested: 12/07/2019

Mobile Usability

90%

Size content to viewport

Size tap targets appropriately

Mobile Speed

43%

Optimize images

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

Minify JavaScript

Leverage browser caching

Minify CSS

Enable compression

Mobile Resource Breakdown

Total Resources	113
Number of Hosts	11
Static Resources	102
JavaScript Resources	38
CSS Resources	24

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Codeforces.com Codeforces

Codeforces. Programming competitions and contests, programming community

Codeforces.com Overview

Codeforces.com Rank Summary

Codeforces.com Website Safety

Codeforces.com Rank History

Codeforces.com Hosting Information

Codeforces.com Domain Registration and Settings

Codeforces.com HTML Check

Codeforces.com Desktop Performance

Codeforces.com Mobile Insights

Codeforces.com Similar Audits

Codeforces.com Common Typos