atcoder.jp
Registered
Page analyze update date:
2026/03/29 04:41:01
Last whois update date:
2026/03/15 17:14:13
Domain Status
Registered
Paid till
01.01.1970
Available from
31.01.1970
×
![Fullscreen website screenshot]()
atcoder.jp Website screenshot
SEO Score
38.36%
56
Score achieved
146
Maximum score
Main Information
Title: AtCoder
Description: AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online.
Keywords: empty
Page Encoding:
utf-8
Page Filesize: 40 KB
Server Information
IP: 108.138.233.122
Location: United States,US,,,37.751,-97.822,America/Chicago
Encoding: utf-8
Whois Information
creation_date: on] 2014/11/15
creation_time:
expiration_date: on] 2026/11/30
expiration_time:
Whois Raw Data
[ JPRS database provides information on network administration. Its use is ]
[ restricted to network administration purposes. For further information, ]
[ use 'whois -h whois.jprs.jp help'. To suppress Japanese output, add'/e' ]
[ at the end of command, e.g. 'whois -h whois.jprs.jp xxx/e'. ]
Domain Information:
[Domain Name] ATCODER.JP
[Registrant] AtCoder Inc.
[Name Server] ns-96.awsdns-12.com
[Name Server] ns-1144.awsdns-15.org
[Name Server] ns-890.awsdns-47.net
[Name Server] ns-1543.awsdns-00.co.uk
[Signing Key]
[Created on] 2014/11/15
[Expires on] 2026/11/30
[Status] Active
[Last Updated] 2025/12/01 01:05:04 (JST)
Contact Information:
[Name] Whois Privacy Protection Service by VALUE-DOMAIN
[Email] [email protected]
[Web Page] https://www.value-domain.com/
[Postal code] 530-0011
[Postal Address]
[Phone] 06-6241-6585
[Fax] 06-6374-0121
SEO Audit
Technical SEO
✓
Response Code
HTTP/2 200
Status 200 OK - page loads correctly.
✓
Character Encoding
Page: utf-8, Header: utf-8
Character encoding consistent between HTML and headers.
✓
Page Size
41070 bytes
Page size acceptable for fast loading.
✓
Resources
0 total
Optimal number of resources.
✓
Hreflang Tags
hreflang tags
Add hreflang tags if you have multilingual content.
!
Robots.txt
Missing
Add robots.txt file to control search engine crawling.
!
Sitemap
Not found
Add sitemap.xml and reference it in robots.txt.
!
HTTPS
No
Switch to HTTPS for security and SEO benefits.
✓
Compression
gzip
Gzip or Zstd compression enabled for faster loading.
✓
Caching
no-cache, no-store, must-revalidate, private
Cache-control headers properly set.
!
Page Speed
Unknown
Load time not measured.
On-Page SEO
!
Title
AtCoder
Title too short. Expand to 30-60 characters for better SEO.
✓
Meta Description
AtCoder is a programming contest site for anyone from beginners to experts. We hold weekly programming contests online. Lenght:119
Good meta description length (100-160 characters).
!
H1 Heading
0 found - ""
Add exactly one H1 heading with primary keywords.
!
Word Count
Content very short. Aim for at least 500 words for better SEO.
!
Canonical Tag
Add canonical tag to prevent duplicate content issues.
✓
Duplicate Meta
[]
No duplicate meta tags found.
✓
Keywords
empty
Meta keywords set (note: not used by major search engines).
Content and UX
!
Language
Add lang attribute to tag for accessibility and SEO.
✓
Images
0 total, 0 missing ALT
All images have proper ALT text.
!
Viewport
Add viewport meta tag for mobile responsiveness.
!
Open Graph
Missing: og:title, og:description, og:image, og:url
Add missing OpenGraph tags for social media sharing: og:title, og:description, og:image, og:url
!
Structured Data
JSON-LD scripts
Add structured data (JSON-LD) for rich snippets and better SEO.
Positions in Google
Search Phrases - Google
| Position | Phrase | Page | Snippet |
|---|---|---|---|
| 5 | /contests/abc361/tas... | ||
| 20 | /contests/abc414/tas... | ||
| 33 | /contests/abc166/tas... | ||
| 34 | /contests/abc417/tas... | ||
| 34 | /contests/abc391/tas... |