60 out of 100

bigocheatsheet.com

Visit
Good — Likely Safe

Big-O Algorithm Complexity Cheat Sheet (Know Thy Complexities!) @ericdrowell

13 years old SSL Secure Not Blacklisted
Checked 1 week ago Re-check
Screenshot of bigocheatsheet.com
Dangerous Suspicious Fair Good Very Good Excellent

Trust Score

60/100

Domain Age

13 yrs

SSL

Secure

Blacklist

Clean

Server

Phoenix, US

Platform

React

Trust Score Breakdown

SSL Certificate 10/10

188 days remaining

Domain Age 10/10

13.6 years old

Safety APIs 8/10

GSB clean, VT not checked

DNSBL Blacklists 8/8

Clean on all 18 lists

WHOIS Transparency 0/8

Owner information is hidden

Security Headers 0/8

Grade: F

HTTP Behavior 7/7

HTTPS redirect active, 1 redirects

Email Security 1/5

Grade: D — SPF

Traffic Rank 1/5

Rank #688268 (top-1m)

Contact Information 0/5

No contact page detected

Privacy Policy 0/5

No privacy policy detected

Mobile Friendly 0/4

Not checked or failing

Phishing Databases 4/4

Clean — not in phishing databases

Content Safety 3/3

Risk level: safe

Brand Safety 3/3

No brand impersonation detected

Favicon & Content 5/5

Favicon found. 924 words on homepage.

WHOIS Information

Registrar GoDaddy.com, LLC
Registration Date 2012-10-31
Expiry Date 2026-10-31
Updated Date 2024-11-01
Domain Age 13 years (very established)
WHOIS Privacy Enabled (Hidden)
Name Servers ns17.domaincontrol.com, ns18.domaincontrol.com
Domain Status
client delete prohibited client renew prohibited client transfer prohibited client update prohibited

SSL Certificate

Valid
Status Valid SSL Certificate
Issuer GoDaddy TLS Intermediate CA DV - R1v1
Issuer Organization GoDaddy.com
Valid From 2026-06-04
Valid Until 2026-12-19
Days Remaining 188 days
Grade A
Wildcard No
Subject bigocheatsheet.com
Covered Domains (SAN)
bigocheatsheet.com www.bigocheatsheet.com

DNS Records

✗ SPF ✗ DKIM ✗ DMARC

SOA Record

mname: ns17.domaincontrol.com
rname: dns.jomax.net
serial: 2021113000
refresh: 28800
retry: 7200
expire: 604800
min-ttl: 3600

IP & Hosting Information

IPv4 Address 107.180.47.5
Hosting Provider AS400754 GoDaddy.com, LLC
Organization AS400754 GoDaddy.com, LLC
ASN AS400754
Country US
City Phoenix
Region Arizona
Timezone America/Phoenix

Safety & Threat Detection

Google Safe Browsing

Clean

VirusTotal

Not checked (API key required)

DNSBL Blacklist Check

Clean

Checked against 18 DNSBL servers.

All checked servers:

✓ multi.surbl.org
✓ uribl.swinog.ch
✓ dbl.spamhaus.org
✓ uri.blacklist.woody.ch
✓ rhsbl.sorbs.net
✓ nomail.rhsbl.sorbs.net
✓ zen.spamhaus.org
✓ bl.spamcop.net
✓ b.barracudacentral.org
✓ dnsbl.sorbs.net
✓ spam.dnsbl.sorbs.net
✓ cbl.abuseat.org
✓ dnsbl-1.uceprotect.net
✓ psbl.surriel.com
✓ all.s5h.net
✓ rbl.interserver.net
✓ dnsbl.dronebl.org
✓ access.redhawk.org

Phishing Database Check

PhishTank

Not listed — Clean

OpenPhish

Not listed — Clean

Email Security

D
50/100

Provider: Microsoft

MX Records (1 records)
SPF (strict)
DKIM
DMARC
BIMI

⚠ No DKIM records found — email authenticity unverifiable

⚠ No DMARC record — no policy for failed email authentication

Content Analysis

Safe Risk (0/100)
✓ Login Form: None
✓ Payment Form: None
✓ Obfuscated JS: None
✓ Meta Redirect: None
External Scripts: 0
External iFrames: 0

Google Search Preview

https://bigocheatsheet.com

Big-O Algorithm Complexity Cheat Sheet (Know Thy Complexities!) @ericdrowell

No meta description found.

SEO Metrics

Page Title Big-O Algorithm Complexity Cheat Sheet (Know Thy Complexities!) @ericdrowell (76 chars)
Meta Description Not found
H1 Tags Know Thy Complexities!
H2 Tags Count 7
Canonical URL Not set
Robots.txt Found
XML Sitemap Found
Language Not detected
Word Count 924
Internal Links 1
External Links 87
Total Images 1 (1 missing ALT)
Favicon Found
Has Video No

Schema & Social Markup

✗ Open Graph
✗ Twitter Card
✗ Hreflang
✗ Schema.org

Essential Pages

✗ Privacy Policy
✗ Terms of Service
✗ Contact Page
✗ About Page

Top Keywords

log
66
tree
8
sort
8
var
8
document
8
google
7
adsbygoogle
6
big
5
push
5
time
5

H2 Headings (7)

Big-O Complexity Chart
Common Data Structure Operations
Array Sorting Algorithms
Learn More
Get the Official Big-O Cheat Sheet Poster
Contributors
Make this Page Better

CSS & JavaScript Files

CSS (1/2 minified)

✓ https://cdnjs.cloudflare.com/ajax/libs/normalize/4.2.0/normalize.min.css
⚠ https://bigocheatsheet.com/css/main.css

JavaScript (0/4 minified)

⚠ https://bigocheatsheet.com/pagead2.googlesyndication.com/pagead/js/adsbygoogle.j...
⚠ https://bigocheatsheet.com/pagead2.googlesyndication.com/pagead/js/adsbygoogle.j...
⚠ https://bigocheatsheet.com/pagead2.googlesyndication.com/pagead/js/adsbygoogle.j...
⚠ https://bigocheatsheet.com/platform-api.sharethis.com/js/sharethis.js#property=5...

Technology Detection

⚙ Web Server Apache
</> Programming Language PHP
🎨 Frontend Framework React
📈 Analytics & Tracking
Google Analytics (UA)

All Detected Technologies

Apache PHP React Google Analytics (UA)

Core Web Vitals

PageSpeed data not available — Google API key may be required.

HTTP Information

HTTP Status 200
Response Time 2201 ms
Load Time 2201 ms
GZIP Compression Disabled
HTTPS Redirect Yes
WWW Redirect No
Redirect Count 1
Final URL https://www.bigocheatsheet.com/

Security Headers

F
✗ HSTS
Missing
✗ Content-Security-Policy
Missing
✗ X-Frame-Options
Missing
✗ X-XSS-Protection
Missing
✗ X-Content-Type-Options
Missing
✗ Referrer-Policy
Missing
✗ Permissions-Policy
Missing

Redirect Chain

1 HTTP/2 301 https://www.bigocheatsheet.com/
2 HTTP/2 200 Final destination

Server Location

Phoenix, Arizona, US | AS400754 GoDaddy.com, LLC

Response Time

2,201ms Slow
0ms 500ms 1500ms 3000ms+

WAF & CDN Detection

CDN

Not detected

Web Application Firewall

Not detected

Web Server

Apache

HTTPS Redirect

HTTP → HTTPS active

Mobile Friendliness

Not Optimized

Viewport Meta

Missing

robots.txt & Sitemap

✓

robots.txt

Found

✓

sitemap.xml

Found

robots.txt Preview

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<title>301 Moved Permanently</title>
</head><body>
<h1>Moved Permanently</h1>
<p>The document has moved <a href="https://www.bigocheatsheet.com/robots.txt">here</a>.</p>
</body></html>

Common Ports

Based on standard web service detection:

HTTP :80
HTTPS :443
FTP :21
SSH :22
SMTP :25
MySQL :3306

Social Media Presence

Twitter

https://twitter.com/ericdrowell

Github

https://github.com/ericdrowell

Domain History (Wayback Machine)

First Archived 2012-11-09
Last Snapshot 2026-05-14
View Oldest Snapshot → Browse All Snapshots →

User Reviews

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Quick Info

Page Title

Big-O Algorithm Complexity Cheat Sheet (Know Thy C...

Hosting

AS400754 GoDaddy.com, LLC

Server

Phoenix, US

Registrar

GoDaddy.com, LLC

SSL Issuer

GoDaddy TLS Intermediate CA DV - R1v1

Domain Age

13 years (very established)

Traffic Rank

#688,268

Tranco List

Top 1m

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Frequently Asked Questions

Is bigocheatsheet.com safe?
Score 60/100. Looks safe.
Is bigocheatsheet.com legit?
13 years (very established) old. SSL active.
Who owns bigocheatsheet.com?
Registrar: GoDaddy.com, LLC. WHOIS private.
Is bigocheatsheet.com blacklisted?
Not blacklisted.
When was bigocheatsheet.com created?
Registered 2012-10-31.