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https://groupon.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 PASS 4 REVIEW
B
Redirect Chain
1 redirect(s), 1044 ms total
REVIEW
1 redirect(s), 1044 ms total
Info::
Single redirect
Got: https://groupon.com → https://www.groupon.com/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1044 ms total
Got: 1044 ms

https://groupon.com

61 ms · HTTP/1.1

301

https://www.groupon.com/

983 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://groupon.com30161 msHTTP/1.1cloudflare
2https://www.groupon.com/200983 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.groupon.com/
200https://groupon.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://groupon.com/ → https://groupon.com/

Consistent

B
TLS Certificate Expiry & Recommendations
71 days until leaf cert expires — 5 issues to address
REVIEW

Certificate validity

71
days left
0d 30d 60d 90d+

Recommended actions

  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • Enable DNSSEC on your domain for DNS spoofing protection
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
B
CDN & Delivery
Cloudflare
REVIEW
Cloudflare
Info::
Site is served via Cloudflare CDN (edge: CDG)
Got: cf-ray: 9efffff1efd53d11-CDG
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9efffff1efd53d11-CDG
A+
DNS Records
2 A records, 63 ms lookup
PASS
2 A records, 63 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.18.12.36, 104.18.13.36
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700::6812:c24, 2606:4700::6812:d24
Info::
3 nameserver(s) configured
Got: blue.foundationdns.net, blue.foundationdns.org, blue.foundationdns.com
Info::
5 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 63 ms
Got: 63 ms
A104.18.12.36, 104.18.13.36
AAAA2606:4700::6812:c24, 2606:4700::6812:d24
CNAME—
NSblue.foundationdns.net, blue.foundationdns.org, blue.foundationdns.com
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
TXT
anthropic-domain-verification-5hb58r=jkWl7775XAHDiS2fMwqD6RAoz
twilio-domain-verification=1d755492596c51fc65fb4fbc19d64c2a
cloudflare_dashboard_sso=470ba9cd4b208e366b18f40fbbf0690f
google-site-verification=bnYwipU3W9slwXzZwDq3c6zaiWpD_KiGUlJdiftfjgI
wiz-domain-verification=38911e92baad6466216aae3a3acce51e6363effe4b7e2316053fdbe8...
facebook-domain-verification=c60imsb8lu41f5g3ajiga3ule9yhha
google-site-verification=i-sWGZhjAmu9-vW3J4n2RYoqr1x-pQT_hk5nShG6BGE
google-site-verification=S5RW3bm-ZPLySg_MzGpW4t-JNHgyKYrnGZKtM_a3f_4
ppm5gp7f3c7tx01z9cnp88mf7vc669x3
atlassian-domain-verification=QIfugBKln2pS3/MW3aIctIDOP9Ncfh00zbGGrwInj4mS0CedhC...
MS=6FE1E7D0B585AC075F50EBE6B4BC4DC37B798AF1
tiktok-developers-site-verification=KWAw5A9Ic1U0eTYagaheMcBqlmXsMU2Z
onetrust-domain-verification=ff5b22486baf4fe0b8b50034143076d2
apple-domain-verification=6GOjopirIpRHnCxT
google-site-verification=6HK6n1AXDMT6VC3cCX4qjVMGjj6tX12Y74c3mfBeNL4
DirectFedAuthUrl=https://groupon.okta.com/app/groupon_pwcfederationnew_1/exk21lt...
mandrill_verify.esh2KjqaJCaa1-KA4qm7fg
wiz-domain-verification=9d76786c3d81a543b60161ace1e1120754fde8e8eeff8557f4485b91...
pardot991802=3376ec1e838ee9e4f3b5f904c854546d2a22b266ef397d629313eee9c5bc2114
docker-verification=84154f8d-f1e0-4e55-b66f-6981b74cc7dc
SPF v=spf1 include:spf.groupon.com include:_spf.google.com include:_spf.salesforce.c...
google-site-verification=pbR_15RIr57-XDPO7GMJBjnwDXcPgT-Oa1-OHfMRJGE
google-site-verification=LAePzEVB8hoONUKTNFcykITZmgGLjByjqDkC7mwiTU4
adobe-idp-site-verification=525ae05e-61ea-42e0-aa5c-7b772b5d1440
google-site-verification=hkhcfNz4uIPjSMGt9ZJL-lR-UOD_6JzHDGlrjDGM2Mo
CAALookup not available with standard resolver
Resolved in 63 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A+
IPv6 Readiness
IPv6 reachable (17 ms)
PASS
IPv6 reachable (17 ms)
Info::
IPv6 is configured and reachable at 2606:4700::6812:c24, 2606:4700::6812:d24
Got: 17 ms connect
IPv6 Ready
AAAA Records 2606:4700::6812:c24, 2606:4700::6812:d24 Connection Reachable (17 ms)
A+
Crawlability
robots.txt present, sitemap with 56 URLs
PASS
robots.txt present, sitemap with 56 URLs
Info::
robots.txt is present
Got: 167 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 56 entries
Info::
Sitemap index with 56 child sitemaps
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 167 B Sitemaps referenced 0 User-agents Blocking No — crawling allowed
<html>
<head><title>301 Moved Permanently</title></head>
<body>
<center><h1>301 Moved Permanently</h1></center>
<hr><center>cloudflare</center>
</body>
</html>
sitemap.xml 200 OK
Type Sitemap Index URLs 56 entries Valid XML Yes
Child Sitemaps:
A
Domain Intelligence
groupon.com — via MarkMonitor Inc., 24 years, 2 months old
PASS
groupon.com — via MarkMonitor Inc., 24 years, 2 months old
Warning::
Domain expires in 37 days
Consider enabling auto-renewal to prevent accidental expiration.
Got: Expires May 29, 2026
Info::
DNSSEC is not enabled
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Info::
Registrar: MarkMonitor Inc.
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Domain expiry

EXPIRED

May 29, 2026

SSL certificate

71 days

Issued by Google Trust Services

Domain age

24 years, 2 months

Registered May 29, 2002

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2606:4700::6812:c24

Registrar

MarkMonitor Inc.

Unlocked 3 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Domain has EXPIRED — renew immediately to avoid total site outage
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar MarkMonitor Inc.
Created May 29, 2002 (24 years, 2 months ago)
Expires May 29, 2026 (1 months)
Last Updated March 26, 2026
Name Servers blue.foundationdns.com, blue.foundationdns.net, blue.foundationdns.org
DNSSEC Not enabled
Hosting
IP Address 2606:4700::6812:c24
Data source: rdap (0.1s)

Consider enabling auto-renewal to prevent accidental expiration.

Why this matters

Domain expiry approaching — renew immediately and ensure auto-renew + alerting are configured.

Source: ICANN renewal policy

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 83 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
28 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
16 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
20 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
83 ms
Total Time Total request time from DNS lookup through full response.
84 ms

Connection waterfall

DNS Lookup 28 ms TCP Connect 16 ms TLS Handshake 20 ms Server Processing 19 ms Content Transfer 0 ms
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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