codeforces.com - Codeforces

Quick Summary

Online Status

Offline

Server IP address resolved: No
Http response code: None
Last Checked: 01/20/2023

Over the time codeforces.com has been ranked as high as 25,144 in the world, while most of its traffic comes from China, where it reached as high as 1,130 position.

Codeforces.com receives about 20,624 unique visitors and 255,738 pageviews per day. The estimated value of codeforces.com is 3,363,840 USD. Each unique visitor makes about 12.4 pageviews on average.

Codeforces.com is registered under .COM top-level domain. Check other websites in .COM zone.

At the time of the last check (November 28, 2019) codeforces.com has an expired SSL certificate issued by Let's Encrypt (expired on January 06, 2020). Check other websites using SSL certificates issued by Let's Encrypt.

According to Google Safe Browsing, Google Safe Search, Symantec and Web of Trust codeforces.com is quite a safe domain.

Mobile-Friendly test indicates that codeforces.com is well optimized for mobile and tablet devices, however website page loading time could be improved.

Codeforces.com General Information

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	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

Country	Percent of 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	Percent of 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%

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?

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%

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%

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

Codeforces.com Alexa 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 Safety Information

Overview

Last Updated: 05/16/2024

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

Malware not found at "codeforces.com".
"codeforces.com" is not a phishing page.
"codeforces.com" does not install unwanted software.
"codeforces.com" does not contain harmfull applications.
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 isvery 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	Let's Encrypt
Issuer	Let's Encrypt Authority X3
Algorithm	RSA-SHA256
Valid form	10/08/2019
Expiration	01/06/2020
Signed	Certificate is not self signed
Additional Domains	*.codeforces.com codeforces.com

Codeforces.com Server Information

Server Location

Geolocation Tool

Saratov

Saratovskaya oblast'

Russian Federation

ASN Information

ASN Lookup Tool

ASN ID: 13335
ASN Title: CLOUDFLARENET - Cloudflare, Inc., US

Last Update: 10/02/2023

ASN Whois

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

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
OrgTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

OrgAbuseHandle: ABUSE2916-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-650-319-8930
OrgAbuseEmail: abuse@cloudflare.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

OrgNOCHandle: NOC11962-ARIN
OrgNOCName: NOC
OrgNOCPhone: +1-650-319-8930
OrgNOCEmail: noc@cloudflare.com
OrgNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

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
RTechName: Admin
RTechPhone: +1-650-319-8930
RTechEmail: rir@cloudflare.com
RTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

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
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Codeforces.com Domain Name Information

WHOIS

WHOIS Lookup Tool

Domain Whois

Domain Name: CODEFORCES.COM
Registry Domain ID: 1551886546_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.nic.ru
Registrar URL: http://nic.ru
Updated Date: 2021-02-16T07:52:25Z
Creation Date: 2009-04-10T18:26:18Z
Registry Expiry Date: 2022-04-10T18:26:18Z
Registrar: Regional Network Information Center, JSC dba RU-CENTER
Registrar IANA ID: 463
Registrar Abuse Contact Email: tld-abuse@nic.ru
Registrar Abuse Contact Phone: +7 (495) 994-46-01
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: DNS1.YANDEX.NET
Name Server: DNS2.YANDEX.NET
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2021-04-25T10:34:30Z

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 Validation

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 Insights

Desktop Page Insights Tool

Last tested: 08/10/2016

Desktop

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

Mobile Page Insights Tool

Last tested: 12/07/2019

Mobile

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

Quick Summary

Codeforces.com General Information

Codeforces.com Alexa Rank History

Codeforces.com Safety Information

Codeforces.com Server Information

Codeforces.com Domain Name Information

Codeforces.com HTML Validation

Codeforces.com Desktop Insights

Codeforces.com Mobile Insights

Codeforces.com Nearest Competitors

Codeforces.com Typos