Is stackoverflow.com safe?

Very Likely Safe

No major red flags found. This looks like a legitimate, established website.

Popular site · #550 worldwideChecked Nov 13, 2026

Trust score

Why: Main reasons: domain registered 23+ years ago; not flagged by Google Safe Browsing; popular website — ranked #550 worldwide. Minor issues: site returned HTTP 403; missing HSTS.

Identity & Age100/100

Impersonation Risk100/100

Red Flags100/100

Transparency70/100

Security98/100

Email100/100

Positive highlights

Domain registered 23+ years agoLong-established domains are far less likely to be disposable scams.
Not flagged by Google Safe BrowsingNo malware, phishing, or unwanted-software match in Google's live threat database.
HTTPS is enforcedAll redirects stayed on HTTPS. Traffic is encrypted end-to-end.
Valid SSL / TLS certificate activeIssued by C=US, O=Let's Encrypt, CN=YE2, valid for 10 remaining days.
Popular website — ranked #550 worldwideListed in the Tranco top 1 million websites. Scam sites are almost never this popular.
No impersonation patterns detectedDomain doesn't look like a typosquat, doesn't embed a well-known brand, and uses ASCII characters.
Not listed on URLhaus malware blocklist
Fast response (27ms)
Not present in PhishStats phishing feed
DMARC published (reject)

Negative highlights

Site returned HTTP 403The server is reachable but did not return a success status.
Missing HSTSTells browsers to only use HTTPS for this domain.
Certificate expires soon (10 days)

Note: Registered via CSC Corporate Domains, Inc..

Note: 1 technologies detected. Cloudflare

Note: Policy pages could not be checked. The site showed our scanner a bot-check or short page, so privacy, terms and contact pages were not verified. This is common for large sites and is not counted against them.

Key facts about stackoverflow.com

Website: stackoverflow.com
Popularity: #550 worldwide (Tranco top 1M)
Domain created: Dec 26, 2003 (22.9 years old)
Domain expires: Feb 2, 2027
Registrar: CSC Corporate Domains, Inc.
Owner details: Public in WHOIS
IP address: 198.252.206.1
Hosting / CDN: Cloudflare
SSL certificate: Let's Encrypt · valid until Nov 23, 2026
Email security: SPF ✓ · DMARC ✓ (reject)
Threat blocklists: Not listed (clean)
Technology: Cloudflare

Summary

93/100 — trusted. Long-established domain (22.9 years old), clean threat reputation, no impersonation patterns.

No malware/phishing on feedsGood reputationHTTPS enabled

Full technical report

Domain Information

Registration timeline, age calculation, registrar details, and ICANN status.

Verified

Registrar Name: CSC Corporate Domains, Inc.
Creation Date: December 26, 2003 (22.9 years ago)
Last Updated: January 29, 2026
Registry Expiry Date: February 2, 2027
WHOIS Privacy Protection: Publicly Visible
Domain Status Codes: client transfer prohibited

ICANN Status Badges

client transfer prohibited

Open in standalone WHOIS / RDAP Lookup tool →

Domain registered 23+ years ago

Long-established domains are far less likely to be disposable scams.

+15

Registered via CSC Corporate Domains, Inc.

Owner information disclosed

The domain publishes registrant contact info — a small positive transparency signal.

HTTP Headers & Security

Full HTTP response headers, HSTS, Content Security Policy (CSP), and security baselines.

Good

Security Header Baseline

Strict-Transport-SecurityMissing

Content-Security-PolicyMissing

X-Frame-Options Present

X-Content-Type-Options Present

Referrer-PolicyMissing

Permissions-PolicyMissing

Recommended Missing Headers

missing: HSTS

All Response Headers (21)

accept-ch: Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model, UA-Platform-Version, UA-Platform, UA
cf-mitigated: challenge
cf-ray: a59e9c996bc93564-CMH
connection: close
content-length: 5610
content-security-policy: default-src 'none'; script-src 'nonce-jSuj4lKv95JLMcQOzNTij9' 'unsafe-eval' https://challenges.cloudflare.com; script-src-attr 'none'; style-src 'unsafe-inline'; img-src 'self' https://challenges.cloudflare.com; connect-src 'self' https://challenges.cloudflare.com; frame-src 'self' https://challenges.cloudflare.com blob:; child-src 'self' https://challenges.cloudflare.com blob:; worker-src blob:; form-action http: https:; base-uri 'self'
content-type: text/html; charset=UTF-8
critical-ch: Sec-CH-UA-Bitness, Sec-CH-UA-Arch, Sec-CH-UA-Full-Version, Sec-CH-UA-Mobile, Sec-CH-UA-Model, Sec-CH-UA-Platform-Version, Sec-CH-UA-Full-Version-List, Sec-CH-UA-Platform, Sec-CH-UA, UA-Bitness, UA-Arch, UA-Full-Version, UA-Mobile, UA-Model, UA-Platform-Version, UA-Platform, UA
cross-origin-embedder-policy: require-corp
cross-origin-opener-policy: same-origin
cross-origin-resource-policy: same-origin
date: Fri, 13 Nov 2026 14:54:26 GMT
origin-agent-cluster: ?1
permissions-policy: accelerometer=(),camera=(),clipboard-read=(),clipboard-write=(),geolocation=(),gyroscope=(),hid=(),magnetometer=(),microphone=(),payment=(),publickey-credentials-get=(),screen-wake-lock=(),serial=(),sync-xhr=(),usb=(),xr-spatial-tracking=*
referrer-policy: same-origin
server: cloudflare
server-timing: chlray;desc="a59e9c996bc93564"
set-cookie: __cf_bm=LFxmCcI.Benhfov0m7kofoaMmUkXELI3ivgvqZGn52s-1794581666.7836049-1.0.1.1-RN.JjUhRM19eUlceGCcRIbIkDyALacN7ZTRR0d5vhGBZIxNrYb.yIUQlDSfXh6ebJie_hFcNXlHkDeupbc7uikG0viLsEqp3s0i_.4tp.DZlLlVmqpkgcKK1mTE8.tku9L9VDOeUxqdLnhDuktQDBDocSm1roAdXf3T.zc_vHIU; HttpOnly; SameSite=None; Partitioned; Secure; Path=/; Domain=stackoverflow.com; Expires=Fri, 13 Nov 2026 15:24:26 GMT
x-content-type-options: nosniff
x-dns-prefetch-control: off
x-frame-options: SAMEORIGIN

Inspect all headers in HTTP Header Checker tool →

Missing HSTS

Tells browsers to only use HTTPS for this domain.

-4

Content Security Policy is set

Restricts which scripts and resources the page can load.

X-Frame-Options is set

Prevents clickjacking by disallowing framing.

X-Content-Type-Options is set

Blocks MIME-sniffing browser attacks.

Referrer Policy is set

Controls what referrer information is sent with requests.

Permissions Policy is set

Restricts access to powerful browser features (camera, mic, etc.).

DNS Records

Encrypted DoH resolution: A, AAAA, MX mail servers, authoritative NS, and TXT verification.

Resolved

IPv4 Addresses (A): 198.252.206.1
IPv6 Addresses (AAAA): None
Mail Servers (MX): aspmx.l.google.com (Priority: 1), alt1.aspmx.l.google.com (Priority: 5), alt2.aspmx.l.google.com (Priority: 5), alt3.aspmx.l.google.com (Priority: 10), alt4.aspmx.l.google.com (Priority: 10)
Authoritative Nameservers (NS): damian.ns.cloudflare.com, sureena.ns.cloudflare.com
TXT Records Found: 22 TXT verification records

A Records (IPv4)

198.252.206.1

TXT Verification Records

MS=ms52592611

ZOOM_verify_AbkNwz5bBl0eurcDKyhhuk

adobe-idp-site-verification=25ba5203f3687c9cd6ee3223ee5de1528917828d1da3ebd3bd9a44094cbfc4ac

anthropic-domain-verification-q70207=cKyy0llXkD10O4rDQpWz8tQ5K

apple-domain-verification=O9jlnJXAQ7sNSZqC

atlassian-domain-verification=byLeZgl3MIcfOqwWuMhq8Fhr/1zem/jIaouJegvDZbBKUU5OqhwDjdpkyYg5CTzm

cursor-domain-verification-sb0ayf=Pk6AyptQuTpzpcuSlfYGWloxv

docker-verification=d65aee54-9091-4ceb-b792-61f5d5804050

docusign=4262531d-29f4-4a62-9f33-ae9f66f5247b

google-site-verification=2Bi6SYw5skkRexdtdLPL2gpxeIhLxnYVqITVP9Htl3w

google-site-verification=ctogLnZNAdc_CXq8yOhODMLpmugGynjxKecKHDz4oL8

google-site-verification=o3EMam8yBGo1yEjyybIiZcOunGHOQKpo8JmOtp9n1BU

google-site-verification=rdWtMbplKjbRHGr2dNONfwkqithlUvjr3u6i8QEz_mo

ibmid=4e7cbbb3-5f12-40b4-96c7-5b064347b822

make-domain-verification=eec31159-f381-4f38-9d89-e59123dd023e

onetrust-domain-verification=0d9d67f856334905a54256085a5768b3

onetrust-domain-verification=e445562296a64c649ae3d520230b8c4c

openai-domain-verification=dv-GLNufzbWDzAq0fDXHD6jxeCK

profound-domain-verification-5p599x=hWudYd2Du6WOYOod5ko9Rwnp8

v=MCPv1; k=ed25519; p=VhBofO8RaYvTvHT7q5tTty+HQeCU8R6h5Y8k/sj20So=

v=spf1 ip4:52.38.191.241 include:_spf.google.com include:mailgun.org include:sendgrid.net include:mail.zendesk.com include:spf.tipalti.com ~all

work-os-domain-verification-43a3e0=GoDUTSc5MMjDaiIC3s5yRKqMD

Run live DNS resolution in DNS Lookup tool →

1 address record(s) resolved

2 authoritative nameservers

WHOIS & Identity Lookup

Domain ownership status, registry lifecycle, nameservers, and privacy redaction.

Found

Registrable Domain: stackoverflow.com
Registrar Organization: CSC Corporate Domains, Inc.
WHOIS Privacy Status: Public Registration Data
Registry Status Codes: client transfer prohibited
Delegated Authoritative Nameservers: damian.ns.cloudflare.com, sureena.ns.cloudflare.com
Registration Lifecycle: Registered: 2003 → Expires: 2027

Nameservers (NS)

damian.ns.cloudflare.comsureena.ns.cloudflare.com

Run dedicated WHOIS query for stackoverflow.com →

Domain registered 23+ years ago

Long-established domains are far less likely to be disposable scams.

+15

Registered via CSC Corporate Domains, Inc.

Owner information disclosed

The domain publishes registrant contact info — a small positive transparency signal.

Email Security & Deliverability

SPF record validation, DMARC policy enforcement, DKIM selectors, and MX reputation.

Protected

SPF Record: v=spf1 ip4:52.38.191.241 include:_spf.google.com include:mailgun.org include:sendgrid.net include:mail.zendesk.com include:spf.tipalti.com ~all
DMARC Policy Mode: Policy: REJECT
DMARC Raw Record: v=DMARC1; p=reject; pct=100; rua=mailto:dmarc-aggregates@stackoverflow.com; ruf=mailto:dmarc-forensics@stackoverflow.com; fo=1
DKIM Selectors Detected: google, s1, s2

Email Protection Summary: This domain has strong email authentication configured to prevent spammers from sending emails impersonating this brand.

Test email deliverability in Email Reputation tool →

SPF record published

DMARC published (reject)

DKIM configured (google, s1, s2)

Threat Intelligence & Blocklists

Multi-source malware feeds (URLhaus), phishing checks (PhishStats, Safe Browsing), and typosquats.

Clean

URLhaus Malware

Clean / Not Listed

PhishStats Feed

Clean / Not Listed

Google Safe Browsing

Clean / Verified

Root Domain Label: stackoverflow
Top-Level Domain (TLD): .com (Standard TLD)
Punycode Obfuscation: No (Standard ASCII)
Homoglyph / Lookalike Script: No mixed scripts
Brand Match Analysis: No recognized brand impersonation
Typosquatting Risk: Clean

No impersonation patterns detected

Domain doesn't look like a typosquat, doesn't embed a well-known brand, and uses ASCII characters.

Technology Stack & Metadata

Detected CMS, JavaScript frameworks, analytics tags, CDN providers, and page metadata.

Detected

Detected Technologies by Category

cdn

Cloudflare

Page Metadata & Fingerprint

HTML Title: Just a moment...
Meta Description: —
Document Language: en-US
Character Encoding: UTF-8
Viewport Setting: width=device-width,initial-scale=1
Generator Software: —

Fingerprint tech stack in Technology Detector tool →

1 technologies detected

Cloudflare

Mobile viewport configured

Page Performance & Compression

Server response time, content payload size, Brotli/Gzip compression, and caching rules.

27ms

Items to Fix & Optimize

Text compression (Brotli/Gzip)

MUCH NEEDEDEnable on server or CDN

Modern image formats (WebP/AVIF/SVG)

OPTIONALConvert heavy images to WebP/AVIF

Protocol

HTTP/2

Binary framing, multiplexed

Compression

NONE

No compression detected

Optimization Signals (From Detectable Headers & Assets)

Image Formats

Legacy / Unchecked

Transfer

Uncompressed

Transport

HTTP/2

These are server-side signals. Actual Core Web Vitals (LCP, INP, CLS) require real-user measurement via PageSpeed Insights.

Detected Asset & Image Formats

WebPAVIFSVGJPEGPNG

HTTP Response Time: 27 ms
Payload Body Size: 5.5 KB
Compression Status: Uncompressed
Cache Directives: Standard caching rules

No findings.

AI Content Safety & Red Flags

High-pressure language, payment gateway safety, disposable domain analysis, and deceptive tactics.

Safe

AI Content Evaluation

93/100 — trusted. Long-established domain (22.9 years old), clean threat reputation, no impersonation patterns. Main reasons: domain registered 23+ years ago; not flagged by Google Safe Browsing; popular website — ranked #550 worldwide. Minor issues: site returned HTTP 403; missing HSTS.

Payment Red Flags: None (No suspicious payment requests)
High-Pressure Language: None (No artificial urgency detected)
Disposable Domain Risk: No (Established infrastructure)
Text Scanned Depth: 60 characters verified

No scam-correlated language found on the home page

No crypto-only / gift-card / wire-only payment demands, and no obvious urgency tactics.

Server & Hosting Infrastructure

Primary IP address, web server software, CDN edge network, and redirect hop chain.

cloudflare

Primary Web Server: cloudflare
CDN / Cloud Provider: Cloudflare
Primary IP Address: 198.252.206.1
HTTP Status Code: 403 OK
Final Landing Destination: https://stackoverflow.com/
Redirect Hop Count: 0 hops

Lookup IP & ASN in IP Lookup tool →Trace redirects in URL Expander tool →

Site returned HTTP 403

The server is reachable but did not return a success status.

-6

HTTPS is enforced

All redirects stayed on HTTPS. Traffic is encrypted end-to-end.

+10

Fast response (27ms)

Served through Cloudflare

Sites behind a major CDN benefit from DDoS protection and edge caching.

SSL / TLS Certificate

Active Certificate Authority, Common Name, validity period, expiration countdown, and SANs.

Secure

Certificate Authority (Issuer): C=US, O=Let's Encrypt, CN=YE2
Subject Common Name (CN): mcp.stackoverflow.com
Validity Period: 10 days remaining (Expires: 2026-11-23T17:44:42Z)
Subject Alternative Names (SANs): 25 domains protected
Certificates Logged (CT): 100 certs recorded

Subject Alternative Names (Sample)

mcp.stackoverflow.comcontests.stackoverflow.comcareers.stackoverflow.commeta.stackoverflow.comes.stackoverflow.comsso.stackoverflow.comclc.stackoverflow.compt.stackoverflow.commeta.jp.stackoverflow.commeta.br.stackoverflow.comemail.stackoverflow.comstackoverflow.comru.stackoverflow.comdev.careers.stackoverflow.commeta.pt.stackoverflow.comja.stackoverflow.combr.stackoverflow.commeta.ja.stackoverflow.commeta.es.stackoverflow.commeta.ru.stackoverflow.combusiness.stackoverflow.comblog.stackoverflow.comtalent.stackoverflow.comapi.stackoverflow.comunifiedsearch.stackoverflow.com+5 more

Check certificate history in SSL Checker tool →

Valid SSL / TLS certificate active

Issued by C=US, O=Let's Encrypt, CN=YE2, valid for 10 remaining days.

+10

Certificate expires soon (10 days)

-4

Content & Transparency Policies

Linked privacy policy, terms of service, about page, social channels, and published contacts.

Warning

Key Legal & Transparency Pages

privacy PageNot linked

terms PageNot linked

contact PageNot linked

about PageNot linked

refund PageNot linked

shipping PageNot linked

cookies PageNot linked

Published Phone Numbers: 1794581666-1.2.1.1, 1794581666, 1794581666-1.0.1.1, 0-1794581666-1.2.1.1

Policy pages could not be checked

The site showed our scanner a bot-check or short page, so privacy, terms and contact pages were not verified. This is common for large sites and is not counted against them.

Robots.txt & Sitemap Discoverability

Search engine crawler directives, indexability, and declared XML sitemaps.

Missing

Robots.txt Directives: Not Found
Sitemaps Declared: None in robots.txt
Disallow Rules Count: 0 rules

No findings.

Export & Share Intelligence

Download the complete official PDF verification report (all sections and technical signals expanded), or export raw JSON telemetry.

Scan Engine Performance

Automated multi-signal inspection pipeline

v5.1.0 Engine

Signals Analyzed

This scan

Sources Checked

Live security feeds

Scan Duration

5.28s

Full live scan

Last Scan

11/13/2026

Live timestamp

Overall Risk

Low Risk

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