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Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
0
REVIEW
2
PASS
7
INFO
0
Probed from Santa Clara, United Stated
200 OK
Checks
9
7 PASS 2 REVIEW
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
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

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

Certificate validity

175
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
A
DNS Records
4 A records, 39 ms lookup
PASS
4 A records, 39 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 18.155.192.28, 18.155.192.29, 18.155.192.112, 18.155.192.11
Info::
No IPv6 (AAAA) records
Warning::
CNAME record at zone apex
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
Got: prod.frontdoor.rdfn.net
Info::
4 nameserver(s) configured
Got: ns-1110.awsdns-10.org, ns-1787.awsdns-31.co.uk, ns-468.awsdns-58.com, ns-764.awsdns-31.net
Info::
No MX records — email not configured via DNS
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Info::
DNS resolution time: 39 ms
Got: 39 ms
A18.155.192.28, 18.155.192.29, 18.155.192.112, 18.155.192.11
AAAA—
CNAMEprod.frontdoor.rdfn.net
NSns-1110.awsdns-10.org, ns-1787.awsdns-31.co.uk, ns-468.awsdns-58.com, ns-764.awsdns-31.net
MX—
TXT—
CAALookup not available with standard resolver
Resolved in 39 ms

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Why this matters

CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.

Learn more ▾

RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.

Source: RFC 1034

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.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://www.redfin.com

https://www.redfin.com

116 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://www.redfin.com200116 msHTTP/1.1istio-envoy
A
Crawlability
robots.txt present, no sitemap
PASS
robots.txt present, no sitemap
Info::
robots.txt is present
Got: 10014 bytes
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.
Info::
robots.txt references sitemap

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more ▾

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

robots.txt 200 OK
Size 10014 B Sitemaps referenced 57 User-agents trovitBot, Exabot, sogou spider, peer39_crawler/1.0, AdsBot-Google, google-amphtml, FireCrawlAgent, bingbot, Sosospider, AdsBot-Google-Mobile, AmazonAdBot, * Blocking No — crawling allowed
User-agent: trovitBot
Allow: /home
Disallow: /

User-agent: Exabot
Allow: /home
Disallow: /

User-agent: sogou spider
Allow: /home
Disallow: /

User-agent: Sosospider
Allow: /home
Disallow: /

User-agent: peer39_crawler/1.0
Disallow: /

User-agent: AdsBot-Google
Disallow: /blog-2025
Disallow: /news-2025
Disallow: /amp-iframe/
Disallow: /stingray
Disallow: /corv
Disallow: /tools/api/agents/agentMarket
Disallow: /mortgage-get-pre-approved?property_zip=*
Disallow: /sitemap_com_properties*
Disallow: *?rfAmpClientId*
Disallow: /*%7B%7B*
Disallow: /graphs/image/*
Disallow: /rocket-mortgage-application*
Disallow: */openbook*
Disallow: */open-book-api/
Disallow: */filter/no-outline

User-agent: AdsBot-Google-Mobile
Disallow: /blog-2025
Disallow: /news-2025
Disallow: /amp-iframe/
Disallow: /stingray
Disallow: /corv
Disallow: /tools/api/agents/agentMarket
Disallow: /mortgage-get-pre-approved?property_zip=*
Disallow: /sitemap_com_properties*
Disallow: *?rfAmpClientId*
Disallow: /*%7B%7B*
Disallow: /graphs/image/*
Disallow: /rocket-mortgage-application*
Disallow: */openbook*
Disallow: */open-book-api/
Disallow: */filter/no-outline

User-agent: google-amphtml
Disallow: /blog-2025
Disallow: /news-2025
Disallow: */images/ghostTownMap2x
Disallow: *?rfAmpClientId*
Disallow: /*%7B%7B*
Disallow: /graphs/image/*
Disallow: /rocket-mortgage-application*
Disallow: */openbook*
Disallow: */open-book-api/

User-agent: AmazonAdBot
Disallow: /

User-agent: FireCrawlAgent
Disallow: /

User-agent: bingbot
Disallow: /blog-2025
Disallow: /news-2025
Disallow: /*/filter/viewport
Disallow: /amp-iframe/
Disallow: /*/Unknown/Unknown-Unknown/
Disallow: /*/amp$
Disallow: /stingray/do/tourlist/
Disallow: /sitemap_com_properties*
Allow: /stingray/*/*/newest_listings.rss
Allow: /stingray/do/buy
Allow: /stingray/do/home
Allow: /stingray/do/js
Allow: /stingray/do/multiget
Allow: /stingray/do/printable-listing
Allow: /stingray/do/printable-property
Allow: /stingray/do/redfin-advantage
Allow: /stingray/do/start
Allow: /myredfin/estimate
Allow: /stingray/do/region-chart
Allow: /stingray/dataloader
Allow: /what-is-my-home-worth
Allow: /stingray/mobile/listingResolver
Allow: /stingray/mobile/ask-agent/api-get-agent
Allow: /stingray/do/mobile-app-listing-details
Allow: /stingray/do/contactbox
Allow: /stingray/js/SearchCommon.js
Allow: /stingray/do/js/*/EnumDefinitions.js
Allow: /stingray/do/query-regionid
Allow: /stingray/do/cacheable-gis-search
Allow: /stingray/do/api-get-header-user-menu
Allow: /stingray/do/api-get-header-menu-settings
Allow: /stingray/do/cacheable-gis-search
Allow: /stingray/do/gis-search
Allow: /stingray/agent/*/photo
Allow: /now
Allow: /direct
Allow: /corv/data/environment/
Disallow: /buy-a-home/start-an-offer?listingId=*
Disallow: /myredfin/
Disallow: /stingray/
Disallow: /VPV
Disallow: /tools
Disallow: /stingray/do/multiget?cacheBuster=*
Disallow: /stingray/do/parcelstream
Disallow: /stingray/dataloader/user/check-favorites?cacheBuster=*
Disallow: /distro.html
Disallow: /flashsniffer
Disallow: /stingray/clicktracker.jsp
Disallow: /rift
Disallow: /*/includes/js/dojo-release-1.8.0-src/dojo/resources/blank.html
Disallow: /blog/search/
Disallow: /rfblog/search/
Disallow: /research/search/
Disallow: /devblog/search/
Disallow: /local/search/
Disallow: /what-is-my-home-worth?*
Disallow: /now/offer/*
Disallow: /now?*
Disallow: /edit-facts/*
Disallow: /homeowner-verification/*
Disallow: /rental-estimate?
Disallow: /mortgage-rates?
Disallow: /images/search/details/twitterCards/twitter-card
Disallow: */images/ghostTownMap2x
Disallow: /tours/checkout/times
Disallow: /corv/beacon/stats
Disallow: /sell-a-home/seller-consultation
Disallow: /sell-a-home/request-analysis
Disallow: /login-for-zendesk
Disallow: /stingray/do/chat/initialData
Disallow: /stingray/do/api-social-login-info
Disallow: /corv/beacon/amp-perf
Disallow: /selling-plan/*
Disallow: /buying-analysis/*
Disallow: /stingray/api/home/details/transit-stops
Disallow: /stingray/api/region/*/floodRisk-data
Disallow: /*%7B%7B*
Disallow: *?rfAmpClientId*
Disallow: /graphs/image/*
Disallow: /rocket-mortgage-application*
Noindex: /edit-facts/*
Noindex: /homeowner-verification/*
Disallow: */openbook*
Disallow: */open-book-api/

User-agent: *
Disallow: /blog-2025
Disallow: /news-2025
Disallow: /stingray/
Allow: /stingray/*/*/newest_listings.rss
Disallow: /corv/
Allow: /corv/data/environment/
Allow: /myredfin/estimate
Allow: /what-is-my-home-worth
Allow: /now
Allow: /direct
Disallow: /buy-a-home/start-an-offer?listingId=*
Disallow: /myredfin/
Disallow: /groups/accept-invite
Disallow: /VPV
Disallow: /tools
Disallow: /distro.html
Disallow: /flashsniffer
Disallow: /rift
Disallow: /*/amp$
Disallow: /*/includes/js/dojo-release-1.8.0-src/dojo/resources/blank.html
Disallow: /blog/search/
Disallow: /rfblog/search/
Disallow: /research/search/
Disallow: /devblog/search/
Disallow: /local/search/
Disallow: /what-is-my-home-worth?*
Disallow: /now?*
Disallow: /edit-facts/*
Disallow: /homeowner-verification/*
Disallow: /amp-iframe/
Disallow: /rental-estimate?
Disallow: /mortgage-rates?
Disallow: /images/search/details/twitterCards/twitter-card
Disallow: */images/ghostTownMap2x
Disallow: /tours/checkout/times
Disallow: /sell-a-home/seller-consultation
Disallow: /sell-a-home/request-analysis
Disallow: /login-for-zendesk
Disallow: /selling-plan/*
Disallow: /buying-analysis/*
Disallow: /*/Unknown/Unknown-Unknown/
Disallow: /meeting/schedule
Disallow: /buy-a-home/start-an-offer-flow
Disallow: /why-sell?inquirySource=482&
Disallow: /questionnaire/
Disallow: /account-deleted
Disallow: /recommendations-feedback
Disallow: /unsubscribe-confirmation
Disallow: /promo-opt-out/the-great-american-home-search
Disallow: /login-v2?
Disallow: /admin/
Disallow: /now/deal-confirmation/
Disallow: /verify-email
Disallow: /buy-a-home/partner-unsubscribe
Disallow: /redfinnow-questionnaire
Disallow: /opendoor-questionnaire
Disallow: /opendoor/confirmation
Disallow: /mortgage-get-pre-approved*
Disallow: /owner-estimate/
Disallow: /api/v1/rentals/
Disallow: /api/v1/properties/
Disallow: /*%7B%7B*
Disallow: /sitemap_com_properties*
Disallow: *?rfAmpClientId*
Disallow: /graphs/image/*
Disallow: /rocket-mortgage-application*
Disallow: */openbook*
Disallow: */open-book-api/
Disallow: */filter/no-outline

Sitemap: https://www.redfin.com/newest_listings.xml
Sitemap: https://www.redfin.com/sitemap_com_agentprofiles.xml
Sitemap: https://www.redfin.com/sitemap_com_buildings.xml
Sitemap: https://www.redfin.com/sitemap_com_city_agents.xml
Sitemap: https://www.redfin.com/sitemap_com_city_housing_market.xml
Sitemap: https://www.redfin.com/sitemap_com_city.xml
Sitemap: https://www.redfin.com/sitemap_com_mfp_city.xml
Sitemap: https://www.redfin.com/sitemap_com_longtail_city.xml
Sitemap: https://www.redfin.com/sitemap_com_county_agents.xml
Sitemap: https://www.redfin.com/sitemap_com_county_housing_market.xml
Sitemap: https://www.redfin.com/sitemap_com_county.xml
Sitemap: https://www.redfin.com/sitemap_com_mfp_county.xml
Sitemap: https://www.redfin.com/sitemap_com_minor_civil_division.xml
Sitemap: https://www.redfin.com/sitemap_com_neighborhoods_agents.xml
Sitemap: https://www.redfin.com/sitemap_com_neighborhoods_housing_market.xml
Sitemap: https://www.redfin.com/sitemap_com_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_mfp_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_school.xml
Sitemap: https://www.redfin.com/sitemap_com_school_district.xml
Sitemap: https://www.redfin.com/sitemap_com_state.xml
Sitemap: https://www.redfin.com/sitemap_com_top_10.xml
Sitemap: https://www.redfin.com/sitemap_com_zipcode_housing_market.xml
Sitemap: https://www.redfin.com/sitemap_com_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_mfp_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_listings.xml
Sitemap: https://www.redfin.com/sitemap_com_latest_updates.xml

Sitemap: https://www.redfin.com/sitemap_com_rental_city.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_county.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_state.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_apartments_city.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_condos_city.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_houses_city.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_townhomes_city.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_apartments_county.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_condos_county.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_houses_county.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_townhomes_county.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_apartments_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_condos_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_houses_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_townhomes_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_apartments_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_condos_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_houses_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_townhomes_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_mfp_city.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_mfp_neighborhoods.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_mfp_zipcode.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_dps_lnp.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_dps_pdp_na.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_dps_mf.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_dps_sf.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_dps_core.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_dps_additional.xml
Sitemap: https://www.redfin.com/sitemap_com_rental_market_trends.xml
sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.redfin.com/
301https://redfin.com/

Preferred variant: www

HTTP → HTTPS

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

Consistent

A+
Domain Intelligence
redfin.com — via GoDaddy Corporate Domains, LLC, 26 years, 3 months old, hosted on AWS
PASS
redfin.com — via GoDaddy Corporate Domains, LLC, 26 years, 3 months old, hosted on AWS
Info::
Domain registered until May 2, 2027 (1 years 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: GoDaddy Corporate Domains, LLC
Info::
Hosting: AWS
Got: AS16509
Domain expiry

258 days

May 2, 2027

SSL certificate

175 days

Issued by Amazon

Domain age

26 years, 3 months

Registered May 2, 2000

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

18.155.192.112

Registrar

GoDaddy Corporate Domains, LLC

Lock status unknown 4 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
Registrar GoDaddy Corporate Domains, LLC
Created May 2, 2000 (26 years, 3 months ago)
Expires May 2, 2027 (1 years)
Last Updated January 28, 2026
Name Servers ns-1284.awsdns-32.org, ns-146.awsdns-18.com, ns-1591.awsdns-06.co.uk, ns-716.awsdns-25.net
DNSSEC Not enabled
Hosting
IP Address 18.155.192.112
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: rdap (0.2s)

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

A+
HTTP Probe Timing
Total 183 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
6 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
3 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
5 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
95 ms
Total Time Total request time from DNS lookup through full response.
184 ms

Connection waterfall

DNS Lookup 6 ms TCP Connect 3 ms TLS Handshake 5 ms Server Processing 82 ms Content Transfer 88 ms
A
CDN & Delivery
AWS CloudFront (Miss from cloudfront)
PASS
AWS CloudFront (Miss from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: SFO53-P1)
Got: x-amz-cf-id: OpYUgTga1byMKGRPYw63EbAP7z5PyUvKQcWD1PTd3z2EMsJb5pfBVQ==
Info::
CDN cache status: Miss from cloudfront
CDN Detected: AWS CloudFront
Provider AWS CloudFront Cache Status Miss from cloudfront Evidence x-amz-cf-id: OpYUgTga1byMKGRPYw63EbAP7z5PyUvKQcWD1PTd3z2EMsJb5pfBVQ==
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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