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https://extremetech.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
82
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Santa Clara, United States
301 Moved Permanently
Checks
9
5 PASS 3 REVIEW 1 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2606:4700:440b::ac40:93c0, 2606:4700:4408::6812:2840
Info::
IPv6 connection error
Got: dial tcp6 [2606:4700:440b::ac40:93c0]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2606:4700:440b::ac40:93c0, 2606:4700:4408::6812:2840 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

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.extremetech.com/
200https://extremetech.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://extremetech.com/ https://www.extremetech.com/

Consistent

B
TLS Certificate Expiry & Recommendations
75 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

75
days left
0d 30d 60d 90d+

Recommended actions

  • 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
B
CDN & Delivery
Cloudflare
REVIEW
Cloudflare
Info::
Site is served via Cloudflare CDN (edge: SJC)
Got: cf-ray: 9f006901aa130dfd-SJC
CDN Detected: Cloudflare
Provider Cloudflare Evidence cf-ray: 9f006901aa130dfd-SJC
A+
DNS Records
2 A records, 8 ms lookup
PASS
2 A records, 8 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 104.18.40.64, 172.64.147.192
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:440b::ac40:93c0, 2606:4700:4408::6812:2840
Info::
2 nameserver(s) configured
Got: aria.ns.cloudflare.com, owen.ns.cloudflare.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: 8 ms
Got: 8 ms
A104.18.40.64, 172.64.147.192
AAAA2606:4700:440b::ac40:93c0, 2606:4700:4408::6812:2840
CNAME
NSaria.ns.cloudflare.com, owen.ns.cloudflare.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
figma-domain-verification=4f7cdfa45ca39f617dd7ba7b165e1bfd5e9b5e1ec18b849c6098df...
google-site-verification=9JKw-GrEOVvonm1QE0kG-5_3sCarqE808Fad8di9jnY
google-site-verification=uyUnW8L0wR0faPe6WQ7q5mn2IZV6wnS8L1Kbwo_vRDI
tollbit-domain-verification=75f3703af8694dde3a13699d702342595b56e86963356e016827...
SPF v=spf1 ip4:216.24.224.0/20 -all
CAALookup not available with standard resolver
Resolved in 8 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
Redirect Chain
1 redirect(s), 71 ms total
PASS
1 redirect(s), 71 ms total
Info::
Single redirect
Got: https://extremetech.com → https://www.extremetech.com/ (301)
Info::
WWW normalization redirect

https://extremetech.com

31 ms · HTTP/1.1

301

https://www.extremetech.com/

40 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://extremetech.com30131 msHTTP/1.1cloudflare
2https://www.extremetech.com/20040 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 23 URLs
PASS
robots.txt present, sitemap with 23 URLs
Info::
robots.txt is present
Got: 4883 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 23 entries
Info::
Sitemap index with 23 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 4883 B Sitemaps referenced 3 User-agents Bytespider, Direqt Anomura, Poggio-Citations, DDM-DCipher/1.0.7, Offline Explorer, cohere-training-data-crawler, AI2Bot, Applebot, AwarioSmartBot, Channel3Bot, ChatGLM-Spider, Claude-SearchBot, ICC-Crawler, meta-externalagent, mistral.ai, SemrushBot-OCOB, Timpibot, TavilyBot, VelenPublicWebCrawler, *, Bravebot, DeepSeekBot, Factset_spyderbot, iaskspider, Manus-User, CCBot, ClaudeBot, Kangaroo Bot, Kunato, LinerBot, Novellum AI Crawl, OAI-SearchBot, Webzio-Extended, AddSearchBot, ChatGPT-User, Crawl4AI, ICC Crawler, cohere-ai, omgili, Wrtn, ZanistaBot, "008", AutoRAG, GPTBot, meta-externalfetcher, PanguBot, Scrapy, bigsur.ai, Brandwatch, Devin, Echobot Bot, FacebookBot, LCC, ShapBot, HTTrack, Ai2Bot-Dolma, atlassian-bot, Cotoyogi, Datenbank Crawler, iAsk, PerplexityBot, PeopleInc-DCipher-Scraper/1.1.0, QualifiedBot, anthropic-ai, LinkupBot, LINER Bot, PetalBot, SeekrBot, SemrushBotSwa, SBIntuitionsBot, TwinAgent, Diffbot, KlaviyoAIBot, Velen Crawler, YouBot, Amazonbot, Applebot-extended, Big Sur AI, imageSpider, laion-huggingface-processor, netEstate Imprint Crawler, NovaAct, Anchor Browser, DuckAssistBot, ImageSiftBot, meta-webindexer, MistralAI-User, AmazonBuyForMe, Claude-User, Claude-Web, Perplexity-User, Spider, Nutch, Ai2Bot-DeepResearchEval Blocking No — crawling allowed
# Ziff Davis content is made available for your non-commercial use subject to our
# Terms of Use here: https://www.ziffdavis.com/terms-of-use
# Use of any robot, crawler, or other tool to scrape, harvest, extract, or retrieve any content on
# this website using automated means is prohibited without written permission from Ziff Davis.
# Prohibited uses include but are not limited to:
# (1) text and data mining under Art. 4 of the EU Directive on Copyright in the Digital Single
# Market;
# (2) development or operation of artificial intelligence or machine learning software or
# databases, including by training, fine-tuning, embedding, and retrieval-augmented generation;
# (3) creating data sets containing our content or sharing it with others; and
# (4) any commercial purposes.
# Contact licensing@ziffdavis.com for assistance.

# Bot Disallows
# Block AI and other unwanted bots

User-agent: AddSearchBot
User-agent: AI2Bot
User-agent: Ai2Bot-DeepResearchEval
User-agent: Ai2Bot-Dolma
User-agent: AmazonBuyForMe
User-agent: Amazonbot
User-agent: Anchor Browser
User-agent: anthropic-ai
User-agent: Applebot
User-agent: Applebot-extended
User-agent: atlassian-bot
User-agent: AutoRAG
User-agent: AwarioSmartBot
User-agent: Big Sur AI
User-agent: bigsur.ai
User-agent: Brandwatch
User-agent: Bravebot
User-agent: Bytespider
User-agent: CCBot
User-agent: Channel3Bot
User-agent: ChatGLM-Spider
User-agent: ChatGPT-User
User-agent: Claude-SearchBot
User-agent: Claude-User
User-agent: Claude-Web
User-agent: ClaudeBot
User-agent: cohere-ai
User-agent: cohere-training-data-crawler
User-agent: Cotoyogi
User-agent: Crawl4AI
User-agent: Datenbank Crawler
User-agent: DeepSeekBot
User-agent: Devin
User-agent: Diffbot
User-agent: Direqt Anomura
User-agent: DuckAssistBot
User-agent: Echobot Bot
User-agent: FacebookBot
User-agent: Factset_spyderbot
User-agent: GPTBot
User-agent: iAsk
User-agent: iaskspider
User-agent: ICC Crawler
User-agent: ICC-Crawler
User-agent: ImageSiftBot
User-agent: imageSpider
User-agent: Kangaroo Bot
User-agent: KlaviyoAIBot
User-agent: Kunato
User-agent: laion-huggingface-processor
User-agent: LCC
User-agent: LinerBot
User-agent: LinkupBot
User-agent: LINER Bot
User-agent: Manus-User
User-agent: meta-externalagent
User-agent: meta-externalfetcher
User-agent: meta-webindexer
User-agent: mistral.ai
User-agent: MistralAI-User
User-agent: netEstate Imprint Crawler
User-agent: Novellum AI Crawl
User-agent: NovaAct
User-agent: OAI-SearchBot
User-agent: omgili
User-agent: PanguBot
User-agent: Perplexity-User
User-agent: PerplexityBot
User-agent: PeopleInc-DCipher-Scraper/1.1.0
User-agent: PetalBot
User-agent: Poggio-Citations
User-agent: QualifiedBot
User-agent: SeekrBot
User-agent: SemrushBot-OCOB
User-agent: SemrushBotSwa
User-agent: ShapBot
User-agent: SBIntuitionsBot
User-agent: Spider
User-agent: Timpibot
User-agent: TavilyBot
User-agent: TwinAgent
User-agent: Velen Crawler
User-agent: VelenPublicWebCrawler
User-agent: Webzio-Extended
User-agent: Wrtn
User-agent: YouBot
User-agent: ZanistaBot
Disallow: /

# END Ziff Managed/Shared content

# Ziff Davis content is made available for your non-commercial use subject to our
# Terms of Use here: https://www.ziffdavis.com/terms-of-use
# Use of any robot, crawler, or other tool to scrape, harvest, extract, or retrieve any content on
# this website using automated means is prohibited without written permission from Ziff Davis.
# Prohibited uses include but are not limited to:
# (1) text and data mining under Art. 4 of the EU Directive on Copyright in the Digital Single
# Market;
# (2) development or operation of artificial intelligence or machine learning software or
# databases, including by training, fine-tuning, embedding, and retrieval-augmented generation;
# (3) creating data sets containing our content or sharing it with others; and
# (4) any commercial purposes.
# Contact licensing@ziffdavis.com for assistance.
User-agent: *
Disallow: /search
Disallow: /archive/
Disallow: /cdn-cgi/
Disallow: /*?s=*

User-agent: "008"
User-agent: Ai2Bot-Dolma
User-agent: Amazonbot
User-agent: anthropic-ai
User-agent: Applebot
User-agent: Applebot-extended
User-agent: Bytespider
User-agent: CCBot
User-agent: ChatGPT-User
User-agent: Claude-Web
User-agent: ClaudeBot
User-agent: cohere-ai
User-agent: DDM-DCipher/1.0.7
User-agent: Diffbot
User-agent: DuckAssistBot
User-agent: FacebookBot
User-agent: GPTBot
User-agent: HTTrack
User-agent: meta-externalagent
User-agent: meta-externalfetcher
User-agent: Nutch
User-agent: OAI-SearchBot
User-agent: Offline Explorer
User-agent: omgili
User-agent: Perplexity-User
User-agent: PerplexityBot
User-agent: Scrapy
User-agent: Timpibot
User-agent: YouBot
Disallow: /

Sitemap: https://www.extremetech.com/sitemap-index.xml
Sitemap: https://www.extremetech.com/sitemap-news-0.xml
Sitemap: https://www.extremetech.com/sitemap-latest-0.xml

A+
Domain Intelligence
extremetech.com — via CSC Corporate Domains, Inc., 26 years, 3 months old, hosted on Cloudflare
PASS
extremetech.com — via CSC Corporate Domains, Inc., 26 years, 3 months old, hosted on Cloudflare
Info::
Domain registered until Jul 26, 2028 (2 years, 3 months remaining)
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: CSC Corporate Domains, 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.
Info::
Hosting: Cloudflare
Got: AS13335
Domain expiry

739 days

July 26, 2028

SSL certificate

75 days

Issued by Google Trust Services

Domain age

26 years, 3 months

Registered May 8, 2000

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Cloudflare

ASN AS13335

172.64.147.192

Registrar

CSC Corporate Domains, Inc.

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar CSC Corporate Domains, Inc.
Created May 8, 2000 (26 years, 3 months ago)
Expires July 26, 2028 (2 years, 3 months)
Last Updated August 17, 2022
Name Servers aria.ns.cloudflare.com, owen.ns.cloudflare.com
DNSSEC Not enabled
Hosting
IP Address 172.64.147.192
ASN AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
Provider Cloudflare
Data source: rdap (0.1s)

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 36 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
9 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
4 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
13 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
36 ms
Total Time Total request time from DNS lookup through full response.
36 ms

Connection waterfall

DNS Lookup 9 ms TCP Connect 4 ms TLS Handshake 13 ms Server Processing 10 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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