Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Madrid, Spain

301 Moved Permanently

Checks

5 PASS 3 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

No CDN detected

A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.

No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

No IPv6 (AAAA) records found

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

No IPv6 Support

About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

Both www and non-www versions serve content

Got: Both variants return 200 Expected: One variant 301-redirects to the other

HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.comodo.com/

200https://comodo.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://comodo.com/ → https://www.comodo.com/

Consistent

TLS Certificate Expiry & Recommendations

Action

27 days until leaf cert expires — 4 issues to address

REVIEW

Certificate validity

days left

0d 30d 60d 90d+

Renew soon — under 30 days remaining

Recommended actions

Renew certificate — 27 days remaining
Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
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

A+

DNS Records

1 A records, 28 ms lookup

PASS

1 A records, 28 ms lookup

Resolves to 1 IPv4 address(es)

Got: 207.246.124.187

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

2 nameserver(s) configured

Got: ns1.nurd.com, ns2.nurd.com

1 mail exchanger(s) configured

CAA records not checked

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

SPF record present in TXT

DNS resolution time: 28 ms

Got: 28 ms

A	207.246.124.187
AAAA	—
CNAME	—
NS	ns1.nurd.com, ns2.nurd.com
MX	0 comodo-com.mail.protection.outlook.com
TXT	SPF v=spf1 mx include:spf1.comodo.com include:spf.protection.outlook.com include:spf...
CAA	Lookup not available with standard resolver

Resolved in 28 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

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.

Redirect Chain

1 redirect(s), 639 ms total

PASS

1 redirect(s), 639 ms total

Single redirect

Got: https://comodo.com → https://www.comodo.com/ (301)

WWW normalization redirect

Redirect overhead: 639 ms total

Got: 639 ms

https://comodo.com

309 ms · HTTP/1.1

301

https://www.comodo.com/

330 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://comodo.com	301	309 ms	HTTP/1.1	NuCDN/v2.60.1
2	https://www.comodo.com/	200	330 ms	HTTP/1.1	NuCDN/v2.60.1

See the visual redirect chain in the HTTP Probe tab →

A+

Crawlability

robots.txt present, sitemap with 100 URLs

PASS

robots.txt present, sitemap with 100 URLs

robots.txt is present

Got: 10240 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 100 entries

robots.txt does not reference a 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 10240 B Sitemaps referenced 0 User-agents * Blocking No — crawling allowed

User-agent: *
Allow: /

Disallow: /click-track/
Disallow: /offer/
Disallow: /outbound/
Disallow: /internal/
Disallow: /newsletters/
Disallow: /news/itn/images/
Disallow: /includes/
Disallow: /buyev/
Disallow: /index.html?currency=USD&region=North%20America&country=US
Disallow: /index.html?utm_source=distribution&utm_medium=pr&utm_campaign=pr%2Btemplate%2Blinks
Disallow: /index.html?utm_source=distribution&utm_medium=pr&utm_term=Enterprise&utm_content=ESMAV&utm_campaign=120309
Disallow: /repository/docs/instantssl_subscriber_agreement.html?currency=GBP&region=United%20Kingdom&country=GB
Disallow: /services/index.html?currency=GBP&region=United%20Kingdom&country=US
Disallow: /home/uninstall-survey.php
Disallow: /home/uninstall-survey-thank-you.php
Disallow: /products/wizard/footer.php
Disallow: /products/wizard/package.php
Disallow: /products/wizard/results.php
Disallow: /products/wizard/results-prel.php
Disallow: /contact-comodo/thank-you.php
Disallow: /page-not-found.php
Disallow: /listmanager/notification1.php
Disallow: /listmanager/confirmation1.php
Disallow: /listmanager/notification2.php
Disallow: /listmanager/confirmation2.php
Disallow: /listmanager/goodbye.php
Disallow: /products/cancellation-info.php

# Added on 2015

Disallow: /*.swf$
Disallow: /home/download/download-v2.php
Disallow: /email/index.html 
Disallow: /*?aid
Disallow: /*?utm_source
Disallow: /*?source
Disallow: /home/internet-security/internet-security-pro-trial.php?aid=1047 
Disallow: /business-security/email-security/anti-spam/beta-form.php 
Disallow: /home/support-maintenance/free-scan.php
Disallow: /partners/welcome/index.php 
Disallow: /cis-free-v2.php
Disallow: /home/internet-security/cisc-cispro.php
Disallow: /home/internet-security-free/junemail.php
Disallow: /intelappup/index.php
Disallow: /web_qa_check_list/
Disallow: /home/download/download.php?track=2215&prod=secure-email
Disallow: /documentation/download.html
Disallow: /cmc.php
Disallow: /Comodo-Fraud-Incident-20103-23.html
Disallow: /hackerproof/order2.html
Disallow: /business-security/ssl-security.php?s=*
Disallow: /business-security/email-security/antispam-gateway.php?s=*
Disallow: /home/support-maintenance/system-utilities.php?track=*
Disallow: /news/press_releases/23_10_08.html
Disallow: /news/press_releases/10_01_06.html
Disallow: /repository/eula/Comodo-Secure-Browser-EULA-v-12-29-2014.pdf
Disallow: /e-commerce/ss...ertificate.php
Disallow: /e-commerce/user-authentication/customer-feedback.php
Disallow: /products/vengine/setup.html
Disallow: /products/tour.html
Disallow: /archive/nws-who.html
Disallow: /pdfs/userguide.pdf
Disallow: /expert-support.php
Disallow: /users_internet.html
Disallow: /library_glossary.htm
Disallow: /Comodo_SecureEmail_User_Guide.pdf
Disallow: /site/psc?*
Disallow: /site/page?*
Disallow: /site/docs?*
Disallow: /site/userguide?*
Disallow: /support/windowsxp.html
Disallow: /programs-manager-features.php?id=3
Disallow: /products/overview.html
Disallow: /case-study/references/index.php?case-study=family-fund
Disallow: /case-study/references/index.php?case-study=licking-school-district
Disallow: /hackerproof/siteinspector/index.html
Disallow: /research/crypto/CDW_SAC_03.ppt
Disallow: /easy-vpn/index.html

Disallow: /papers/establishingtrust.html
Disallow: /hackerproof/abreporting.html
Disallow: /hackerproof/questions.html
Disallow: /hackerproof/login.html
Disallow: /hackerproof/siteinspector/
Disallow: /e-commerce/user-authentication/email-encryption.php
Disallow: /e-commerce/endpoint-security/vpn-client.php
Disallow: /news/press_releases/27_03_07.html
Disallow: /resources/home/newsletters/feb-10/btn
Disallow: /resources/home/newsletters/jul-10/btn

# Added on 2016

Disallow: /contact-comodo/sales_process.php
Disallow: /partners/process/contact.php

# Added on 2017

Disallow: /products/certified_messaging/
Disallow: /products/access_management/
Disallow: /obfuscation-attacks/
Disallow: /man-in-the-middle/
Disallow: /cross-site-scripting/
Disallow: /cvc/
Disallow: /graphic-attacks/demo/
Disallow: /merchant_login/
Disallow: /news/240602.html
Disallow: /research/crypto/CDW_RSA2003.ppt
Disallow: /e-commerce/user-authentication/authentication-methods.php
Disallow: /business-security/authentication/two-factor-authentication.php
Disallow: /products/managed_security/index.html
Disallow: /e-commerce/user-authentication/authentication-methods.php?key5sk0=%
Disallow: /home/browsers-toolbars/chromodo-private-internet-browser.php?track=*
Disallow: /e-commerce/user-authentication/two-factor.php
Disallow: /products/managed_security/pricing.html?key5sk1=*
Disallow: /home/internet/internet-security-pro.php
Disallow: /home/internetsecurity/antivirus.php
Disallow: /resources/home/newsletters/sep-09/pcmag_fwd_sep09.html

# Added on 16/07/2018
Disallow: /home/download/during-download.php?prod=antivirus-for-mac
Disallow: /home/download/during-download.php?prod=firewall&track=6123&from=free-protection
Disallow: /home/download/during-download.php?prod=cis&track=6114&from=free-protection

# Added on 13/08/2018
Disallow: /e-commerce/bundles/classes/cls-ssl-savings.php
Disallow: /stay-in-loop/send_mail.php

# Added on 01/10/2018
Disallow: /includes/video.php?f=*
Disallow: /partners/process/contact.php?af=*
Disallow: /contact-comodo/sales_process.php?af=*

# Added on 28/12/2018

Disallow: /research/crypto/CDW_RSA_2003.ps
Disallow: /research/crypto/CDW_Ches2001.ps
Disallow: /products/certificate_services
Disallow: /product-category/
Disallow: /shop/sql-server/monoprice-108247-5-1-channel-home-theater-speaker-system-six 
Disallow: /classics/wmc.com

# Added on 02/01/2019

Disallow: /key/ASWD56425CSA
Disallow: /research/crypto/CDW_RSA_2002_Mist.ps
Disallow: /products/certificate_services
Disallow: /support/learning/digital_certific
Disallow: /repository/Comodo
Disallow: /product-category/office-365
Disallow: /product-category/office-2016
Disallow: /shop/sql-server/monoprice-108247-5-1-channel-home-theater-speaker-system-six
Disallow: /classics/wmc.com
Disallow: /product-category/earphones

# Added on 20/02/2019

Disallow: /zerodaychallenge
Disallow: /ttb_searcher/
Disallow: /login/comodo-members.php/*_blank
Disallow: /landing/ssl
Disallow: /secure-dns)
Disallow: /landing/ssl-c
Disallow: /dragon/v3.4
Disallow: /respository

# Added on 02/03/2020

Disallow: /repository/css_privacy_agreement_italian.php
Disallow: /game/*

# Added on 25/01/2021

Disallow: /contact-us/?*
Disallow: /news/press_releases/05_05_09.html
Disallow: /webinars/?category=*
Disallow: /home/download/during-download.php?*
Disallow: /home/internet-security/internet-security-pro.php?rs=*
Disallow: /lab/more-videos.php?*
Disallow: /contact-comodo/contact-us.php?rs=*
Disallow: /emergency-containment/?*
Disallow: /careers/?category=*
Disallow: /data-loss-prevention.php?email=*
Disallow: /in-the-news/?*
Disallow: /home/internet-security/anti-malware.php?ap=*
Disallow: /home/browsers-toolbars/browser.php?category=*
Disallow: /case-studies/?*
Disallow: /?firstname=*
Disallow: /?rs=*
Disallow: /?hubs_campaign=*
Disallow: /?category=*
Disallow: /?email=*
Disallow: /?portalId=*
Disallow: /?hsCtaTracking=*
Disallow: /?scriptPath=*
Disallow: /news-archive/page/*
Disallow: /author/haseebs/page/*
Disallow: /repository/terms.php?rs=*
Disallow: /2016/page/11/?email=*
Disallow: /endpoint-detection-response/?email=*
Disallow: /event/?*
Disallow: /careers/?*
Disallow: /socaap/?*
Disallow: /2008/page/9/?*
Disallow: /why-comodo/?*
Disallow: /2005/page/2/?*
Disallow: /2011/page/*
Disallow: /case-study/marly-computers-vof/?category=*

# Added on 01/02/2021

Disallow: /internet-security/antivirus.php?*
Disallow: /partners.php?*
Disallow: /internet-security/wifi-security.php?*
Disallow: /wannacry-ransomware-endpoints-protection/?*
Disallow: /protect-educational-institution/?*
Disallow: /comodo-company-profile.php?*
Disallow: /webinars/?*
Disallow: /products.php?*
Disallow: /home/internet-security/free-internet-security.php?*
Disallow: /home/free-antivirus/download.php?*
Disallow: /comodo-cybersecurity.php?*

# Added on 10/02/2021

Disallow: /dragon-enterprise/?rs=

# Added on 22/02/2021

Disallow: /support/comodo-support.php?*
Disallow: /home/internet-security/free-internet-security.php?*
Disallow: /landing/wannacry-ransomware-endpoints-protection/?*
Disallow: /home/internet-security/antivirus.php?*
Disallow: /home/internet-security/anti-malware.php?*
Disallow: /schedule-a-demo.php?utm_source=*
Disallow: /landing/secure-government-institutions/?*
Disallow: /landing/insurance-security/?*
Disallow: /index.php?source=*
Disallow: /news/press_releases/index.html?source=*
Disallow: /home/internet-security/antivirus-for-linux.php?*
Disallow: /home/internet-security/wifi-security.php?*
Disallow: /home/internet-security/firewall.php?*
Disallow: /home/internet-security/antivirus-advanced.php?*
Disallow: /secure-email-gateway/?utm_source=*
Disallow: /home/browsers-toolbars/internet-products.php?*
Disallow: /about/comodo-company-profile.php?*
Disallow: /home/internet-security/antivirus-for-mac.php?*
Disallow: /socaap/?utm_source=*
Disallow: /company-narrative-1.php?*
Disallow: /about/comodo-agreements.php?*
Disallow: /business-security/network-protection/cleaning-essentials.php?*
Disallow: /business-security/pki-management/certificate-manager.php?*
Disallow: /emergency-containment.php?*
Disallow: /siem.php?utm_source=*
Disallow: /business-security/email-security/antispam-gateway.php?*
Disallow: /repository/privacy-policy.php?*
Disallow: /includes/video.php?f=*
Disallow: /hackerproof/?*
Disallow: /stay-in-loop/send_mail.php?*
Disallow: /lab/?*
Disallow: /pricing-product.php?*
Disallow: /landing/comodo-conducts-webinar-on-protection-against-ransomware/?*
Disallow: /comodo-cybersecurity.php?*
Disallow: /contact-comodo/contact-us.php?*
Disallow: /business-security/support-services/it-help.php?*
Disallow: /news/?utm_source=*
Disallow: /partners.php?email=*

# Added on 15/03/2021

Disallow: /home/internet-security/internet-security-complete.php?*
Disallow: /home/download/during-download.php?prod=chromodo-browser&ref=*
Disallow: /home/download/during-download.php?prod=browser&track=*
Disallow: /home/internet-security/secure-shopping.php?*
Disallow: /careers.php?*
Disallow: /home/download/during-

sitemap.xml 200 OK

Type URL Set URLs 100 entries Valid XML Yes

Sample URLs:

A+

Domain Intelligence

comodo.com — via Gandi SAS, 28 years, 10 months old, hosted on Vultr

PASS

comodo.com — via Gandi SAS, 28 years, 10 months old, hosted on Vultr

Domain registered until Oct 27, 2026 (6 months remaining)

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.

Registrar: Gandi SAS

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.

Hosting: Vultr

Got: AS20473

Domain expiry

133 days

October 27, 2026

SSL certificate

27 days

Issued by Sectigo Limited

Domain age

28 years, 10 months

Registered October 28, 1997

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Vultr

ASN AS20473

207.246.124.187

Registrar

Gandi SAS

Unlocked 2 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Renew the TLS certificate or verify auto-renewal is working
Enable DNSSEC to protect visitors from DNS spoofing
Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar Gandi SAS

Created October 28, 1997 (28 years, 10 months ago)

Expires October 27, 2026 (6 months)

Last Updated September 26, 2025

Name Servers ns1.nurd.com, ns2.nurd.com

DNSSEC Not enabled

Hosting

IP Address 207.246.124.187

ASN AS20473 (AS-VULTR - The Constant Company, LLC, US)

Provider Vultr

Data source: rdap (0.3s)

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 340 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

PASS

DNS Lookup

26 ms

TCP Connect

100 ms

TLS Handshake

111 ms

Time to First Byte

340 ms

Total Time

340 ms

Connection waterfall

DNS Lookup 26 ms TCP Connect 100 ms TLS Handshake 111 ms Server Processing 102 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.