Infrastructure - https://zillow.com BeaverCheck Audit

C

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

B

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.zillow.com/

200https://zillow.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

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

Consistent

B

TLS Certificate Expiry & Recommendations

121 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

121

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, 4 ms lookup

PASS

4 A records, 4 ms lookup

Resolves to 4 IPv4 address(es)

Got: 99.84.160.15, 99.84.160.74, 99.84.160.98, 99.84.160.31

No IPv6 (AAAA) records

4 nameserver(s) configured

Got: ns-1126.awsdns-12.org, ns-188.awsdns-23.com, ns-1978.awsdns-55.co.uk, ns-709.awsdns-24.net

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: 4 ms

Got: 4 ms

A	99.84.160.15, 99.84.160.74, 99.84.160.98, 99.84.160.31
AAAA	—
CNAME	—
NS	ns-1126.awsdns-12.org, ns-188.awsdns-23.com, ns-1978.awsdns-55.co.uk, ns-709.awsdns-24.net
MX	10 zillow-com.mail.protection.outlook.com
TXT	ZOOM_verify_g3zmMzzxSbyRGE80XhMPaQ _ui9ta7kmntna9fx9k3khchsb70nai67 adobe-idp-site-verification=d5bc3993e341ec9e2211f76c8437d1b427f8dc2b67fcaaad95e2... apple-domain-verification=QPRde8ebYlB5qiWJLg5jy_lqZtfEs1qhV3kkahf-wVU atlassian-domain-verification=dgV3G6mkX85097hkLZzFLTjyRE9EyRvlj3HkR+RR47uo2ISUcE... docusign=d41b9d07-a056-4736-b25a-bfd9493bbcc9 facebook-domain-verification=oza42xuvjx7gi2qkqu214fdfdn83sh google-site-verification=vj5n_vwgH6UQqF3EpXUf2TCCwkF0L261STagywmS6kk slack-domain-verification=SCiUKlfWV8dWeasWT0pgvLj2kDQJS7uSQSqbwf78 SPF v=spf1 include:spf.protection.outlook.com include:mail.zendesk.com include:_spf.... zapier-domain-verification-challenge=0f703ce2-8795-4c0c-88cf-ca04af96a128
CAA	Lookup not available with standard resolver

Resolved in 4 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), 368 ms total

PASS

1 redirect(s), 368 ms total

Single redirect

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

WWW normalization redirect

https://zillow.com

102 ms · HTTP/1.1

301

https://www.zillow.com/

266 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://zillow.com	301	102 ms	HTTP/1.1	AmazonS3
2	https://www.zillow.com/	200	266 ms	HTTP/1.1	CloudFront

See the visual redirect chain in the HTTP Probe tab →

A+

Crawlability

robots.txt present, sitemap with 161 URLs

PASS

robots.txt present, sitemap with 161 URLs

robots.txt is present

Got: 10240 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 161 entries

Sitemap index with 161 child sitemaps

robots.txt references sitemap

robots.txt 200 OK

Size 10240 B Sitemaps referenced 11 User-agents Applebot-Extended, AI2Bot-DeepResearchEval, Ai2Bot-Dolma, ActiveComplyBot, CriteoBot, TaraGroup Intelligent Bot, *, YandexAdditional, YandexAdditionalBot, amazon-kendra, AI2Bot, meta-externalagent, facebookexternalhit, Twitterbot, YouBot, Meta-ExternalAgent, Amazonbot, GumGumBot, LinkedInBot Blocking No — crawling allowed

# Access to and use of Zillow.com is governed by our Terms of Use. See https://www.zillow.com/corp/Terms.htm

User-agent: *

Allow: /homes/for_sale/$
Allow: /homes/for_sale/fore_lt/$
Allow: /homes/fsbo/$
Allow: /homes/for_sale/1_open/$
Allow: /homes/new_homes/$
Allow: /homes/coming_soon/$
Allow: /homes/for_rent/$
Allow: /homes/for_rent/condo,apartment_duplex_type/$
Allow: /homes/for_rent/house,townhouse_type/$
Allow: /homes/recently_sold/$
Allow: /homes/apartment-communities/$

Allow: /homes/for_sale/*_p/$
Allow: /homes/for_sale/fore_lt/*_p/$
Allow: /homes/fsbo/*_p/$
Allow: /homes/for_sale/1_open/*_p/$
Allow: /homes/new_homes/*_p/$
Allow: /homes/coming_soon/*_p/$
Allow: /homes/for_rent/*_p/$
Allow: /homes/for_rent/condo,apartment_duplex_type/*_p/$
Allow: /homes/for_rent/house,townhouse_type/*_p/$
Allow: /homes/recently_sold/*_p/$
Allow: /homes/apartment-communities/*_p/$

Allow: /homes/apartments-pet-friendly/$
Allow: /homes/apartments-1-bedrooms/$
Allow: /homes/apartments-2-bedrooms/$
Allow: /homes/apartments-under-1500/$
Allow: /homes/apartments-under-2000/$
Allow: /homes/apartments-3-bedrooms/$
Allow: /homes/pet-friendly/$
Allow: /homes/rooms-for-rent/$
Allow: /homes/apartments-with-washer-dryer/$

Allow: /homes/apartments-pet-friendly/*_p/$
Allow: /homes/apartments-1-bedrooms/*_p/$
Allow: /homes/apartments-2-bedrooms/*_p/$
Allow: /homes/apartments-under-1500/*_p/$
Allow: /homes/apartments-under-2000/*_p/$
Allow: /homes/apartments-3-bedrooms/*_p/$
Allow: /homes/pet-friendly/*_p/$
Allow: /homes/rooms-for-rent/*_p/$
Allow: /homes/apartments-with-washer-dryer/*_p/$

Disallow: /api/
Disallow: /homes/
Disallow: /?url=
Disallow: /*_rect
Disallow: /*_rect/
Disallow: /*_rid
Disallow: /*_sort/
Disallow: /*.sdirect
Disallow: /*1_fs/
Disallow: /*3ab9b0d/
Disallow: /*3bec89b
Disallow: /*/_type/
Disallow: /*/0-0_beds/
Disallow: /*/admin-ajax.php
Disallow: /*/apartments-are_att/
Disallow: /*/apartments-madden_att/
Disallow: /*/apartments-offers_att/
Disallow: /*/apartments-rent_att/
Disallow: /*cbpartner=
Disallow: /*/CountyAssessorPage.htm?*
Disallow: /*/duplex-apartments_att/
Disallow: /*/floor-map-annotator/*
Disallow: /*/foreclosure--
Disallow: /*/foreclosed/*
Disallow: /*/GetResults.htm*
Disallow: /*/house_type/
Disallow: /*/house,apartment_duplex_type/
Disallow: /*/house,mobile_type/
Disallow: /*/house,mobile,land_type/
Disallow: /*/house,mobile,townhouse_type/
Disallow: /*/loft-apartments_att/
Disallow: /*/mostrecentchange_sort/
Disallow: /*/node_modules/.bin/
Disallow: /*/plus/
Disallow: /*/rent-house_att/
Disallow: /*/rino-_att/
Disallow: /*/qc/
Disallow: /*-qc/
Disallow: /*-qc-*
Disallow: /*/townhome_att/
Disallow: /*/u1_sch/
Disallow: /*/z/internet-tv-deals-saver/?z*
Disallow: /*/z/internet-tv-deals-speed/?z*
Disallow: /*RentalConfirmedClaim
Disallow: /*?searchQueryState=*
Disallow: /ads/
Disallow: /advice-thread/
Disallow: /advicepages/
Disallow: /aerial/
Disallow: /advice/
Disallow: /agent-websites/
Disallow: /ajax/homedetail/CompareWithPublicFactsData.htm
Disallow: /ajax/homedetail/HomeValueChartData.htm
Disallow: /ajax/nav/UserNavAsync.htm?pageframe=true
Disallow: /ajax/rentals/ClaimedRentalProperties.htm?actionType=claims
Disallow: /ajax/ownerview/PerformSellerLeadContact.htm
Disallow: /ajax/ownerview/SellerLeadData.htm
Disallow: /app?
Disallow: /b/*/rental-manager/resources/
Disallow: /b/*bed*/
Disallow: /b/*month*/
Disallow: /b/*!*/
Disallow: /b/*(*/
Disallow: /b/*&*/
Disallow: /b/*/*_ll/
Disallow: /bal/impression/
Disallow: /bal/impression/RecordImpression.htm?
Disallow: /browse/homes/all/
Disallow: /captcha/
Disallow: /captchaPerimeterX/
Disallow: /careers/apply/
Disallow: /careers/jobs/
Disallow: /chat/finance
Disallow: /claiming/
Disallow: /claiming/ClaimProperty.htm?
Disallow: /cma-tool/create/*
Disallow: /cms-constellation/
Disallow: /community/error-subdivision-name-unavailable/
Disallow: /contact/
Disallow: /corp/Privacy.htm
Disallow: /corp/Terms.htm
Disallow: /CountyAssessorPage.htm
Disallow: /del/
Disallow: /discovery/
Disallow: /editing/
Disallow: /email/EnrollmentUnsubscribe.htm
Disallow: /email/SubscriptionTypeUnsubscribe.htm
Disallow: /email/Unsubscribe.htm
Disallow: /for-sale-by-owner/?zpid=
Disallow: /graphql/
Disallow: /home-improvement-dueling-digs/
Disallow: /homedetail/AuthRequired.htm
Disallow: /homedetail/HomeDetail,*Border.*debug*DebugBar.*InspectorButton.link.sdirect
Disallow: /homedetails/*view=owner
Disallow: /homedetails/*/rental-manager/resources/
Disallow: /homedetails/*/*/?altId
Disallow: /homeimprovement/EmbeddedProfile.htm
Disallow: /homepage/HomepageVideoMetrics.htm
Disallow: /howto/GoodNeighborPolicy.htm
Disallow: /HYx10rg3/*
Disallow: /IMAGE
Disallow: /imf-fetch-message/api/v1/request/fetch-message/MOBILE_APP_UPSELL
Disallow: /instant-offers/version/
Disallow: /jmp/questionnaire-eligibility-check
Disallow: /jmp/lead-eligibility
Disallow: /l/
Disallow: /learnmore/
Disallow: /license/
Disallow: /m/
Disallow: /make-me-move?zpid=
Disallow: /make-me-move/?zpid=
Disallow: /mobile/GetAdConfiguration.htm
Disallow: /mobile/MobilePropertyDetails.htm
Disallow: /mobile/WinmoPropertyDetails.htm
Disallow: /mobile/WPPropertyDetails.htm
Disallow: /mortgage/SmallMortgageLoanCalculatorWidget.htm
Disallow: /mortgage/MortgageCalculatorWidgetLarge.htm
Disallow: /mortgage/MortgageRateTable.htm
Disallow: /mortgage/widgets/AffordabilityCalculatorWidget.htm
Disallow: /mortgage/MortgageRateTableWidget.htm
Disallow: /mortgage/MortgageLoanCalculatorWidget.htm
Disallow: /mortgage/RateExplorerGraphWidget.htm
Disallow: /myzillow/
Disallow: /offers/request/
Disallow: /ofr/api/v3/questionnaire
Disallow: /pbflex/
Disallow: /personalization/
Disallow: /post-real-estate-listings?zpid=
Disallow: /post-real-estate-listings/?zpid=
Disallow: /post-rental-listings?zpid=
Disallow: /postings/
Disallow: /postings/PostForSale.htm?
Disallow: /postings/PostMakeMeMoveStreamlined.htm?
Disallow: /*/pre-foreclosure/*
Disallow: /pricing/
Disallow: /profile/*/Advice/
Disallow: /profile/*/Reviews-Written/
Disallow: /profile/*/photos/
Disallow: /profiles/ProfileBorderTemplate,*myzillow*MyListingsTabulated.*postings*owners*OwnersProfileUpsell.*DirectLink.sdirect
Disallow: /real-estate-listings
Disallow: /rental-manager/?source=topnav&itc=postbutton_topnav
Disallow: /rental-manager/?zpid=
Disallow: /rental-manager/properties?postingPath=true
Disallow: /rental-manager/properties/?source=*
Disallow: /rental-manager/r/
Disallow: /rentals/
Disallow: /rentalsrevenue/
Disallow: /rentalsrevenue/resume/UpdatePasswordInline*
Disallow: /research/monthly-reports/
Disallow: /reviews/write?s=
Disallow: /reviews/write/?s=
Disallow: /routing/email/
Disallow: /s/
Disallow: /savedhomes/
Disallow: /schools/TestHistoryAsync.htm
Disallow: /search/browse/HDPTree,*Border.*debug*DebugBar.*InspectorButton.link.sdirect
Disallow: /search/HDPMapResults.htm
Disallow: /search/SavedSearchLightboxContent.htm
Disallow: /sell/?*
Disallow: /sell/options/
Disallow: /showcase/Click.htm?
Disallow: /sitemap/catalog/
Disallow: /sitemap/rss/
Disallow: /sitemap/crawl-monitor/
Disallow: /trk/
Disallow: /ui/
Disallow: /url-shortner/
Disallow: /user/account/SaveSearchOptions.htm
Disallow: /user/account/services/
Disallow: /user/account/services/WhoAmI.htm
Disallow: /user/acct/login/
Disallow: /user/InlineLogin.htm?
Disallow: /user/Login
Disallow: /user/Register
Disallow: /util/ClientLogger.htm
Disallow: /videodetails/
Disallow: /walkscore/
Disallow: /webservice/
Disallow: /webtools/
Disallow: /widgets/
Disallow: /wikipages/
Disallow: /zg-graph/
Disallow: /ajax/profile-broker-website
Disallow: /agent-resources/zgwp/app/themes/paxl/assets/fonts/stargate.ttf
Disallow: /my-agent/eligibility*
Disallow: /jsonp/Bdp.htm?*
Disallow: /ajax/homedetail/MarkPropertyViewed*
Disallow: /wiki/Help*
Disallow: /*/allunits/*
Disallow: /reviews/batch-request/
Disallow: /myzillow/ChangePassword.htm
Disallow: /editing/EditHomeFacts.htm
Disallow: /user/account/
Disallow: /reviews/request/
Disallow: /error/PageNotFound.htm
Disallow: /imf-fetch-message/
Disallow: /app$
Disallow: /*/node_modules/.bin/jest
Disallow: /view-3d-home
Disallow: /b/*/*_p/
Disallow: /rental-manager/login/?url/*
Disallow: /view-imx/
Disallow: /view-skytour/
Disallow: /view-floor-plan/
Disallow: /homeloans/*zga_z_guid=
Disallow: /tech/*s=
Disallow: /async-create-search-page-state
Disallow: /deferred
Disallow: /shopper-platform/


User-agent: facebookexternalhit
User-agent: LinkedInBot
User-agent: Twitterbot
Allow: /view-imx/
Allow: /view-3d-home/

# Bots with limited access to CMS resources
User-agent: YouBot
User-agent: YandexAdditional
User-agent: YandexAdditionalBot
User-agent: Applebot-Extended
User-agent: Amazonbot
User-agent: amazon-kendra
User-agent: AI2Bot
User-agent: AI2Bot-DeepResearchEval
User-agent: Ai2Bot-Dolma
User-agent: meta-externalagent
User-agent: Meta-ExternalAgent
Allow: /agent-resources/
Allow: /blog/
Allow: /data-science/
Allow: /digs/guides/
Allow: /engineering/
Allow: /foreclosures/
Allow: /home-buying-guide/
Allow: /info/
Allow: /lender-resources/
Allow: /marketing/
Allow: /mortgage-learning/
Allow: /multifamily-knowledge-center/
Allow: /promo/
Allow: /public-engagement/
Allow: /rent/guide/
Allow: /rental-manager/resources/
Allow: /resources/
Allow: /research/
Allow: /sellers-guide/
Allow: /tech/
Allow: /video/
Allow: /z/
Disallow: /
Crawl-delay: 1

# Fully Disallowed Bots
User-agent: ActiveComplyBot
User-agent: CriteoBot
User-agent: GumGumBot
User-agent: TaraGroup Intelligent Bot
Disallow: /

Sitemap: https://mortgageapi.zillow.com/sitemap.xml

Sitemap: https://www.zillow.com/xml/indexes/us/static.xml.gz

Sitemap: https://www.zillow.com/xml/indexes/us/hdp/for-sale-by-agent.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/for-sale-by-owner.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/new-construction.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/auction.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/pending.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/recently-sold.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/for-rent.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/off-market.xml.gz
Sitemap: https://www.zillow.com/xml/indexes/us/hdp/other.xml.gz
Site

sitemap.xml 200 OK

Type Sitemap Index URLs 161 entries Valid XML Yes

Child Sitemaps:

A+

Domain Intelligence

zillow.com — via GoDaddy Corporate Domains, LLC, 21 years, 10 months old, hosted on AWS

PASS

zillow.com — via GoDaddy Corporate Domains, LLC, 21 years, 10 months old, hosted on AWS

Domain registered until Nov 11, 2028 (2 years, 7 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: GoDaddy Corporate Domains, LLC

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: AWS

Got: AS16509

Domain expiry

851 days

November 11, 2028

SSL certificate

121 days

Issued by Amazon

Domain age

21 years, 10 months

Registered September 16, 2004

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

99.84.160.15

Registrar

GoDaddy Corporate Domains, LLC

Unlocked 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
Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar GoDaddy Corporate Domains, LLC

Created September 16, 2004 (21 years, 10 months ago)

Expires November 11, 2028 (2 years, 7 months)

Last Updated June 25, 2024

Name Servers ns-1126.awsdns-12.org, ns-188.awsdns-23.com, ns-1978.awsdns-55.co.uk, ns-709.awsdns-24.net

DNSSEC Not enabled

Hosting

IP Address 99.84.160.15

ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)

Provider AWS

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

PASS

DNS Lookup

3 ms

TCP Connect

1 ms

TLS Handshake

4 ms

Time to First Byte

34 ms

Total Time

34 ms

Connection waterfall

DNS Lookup 3 ms TCP Connect 1 ms TLS Handshake 4 ms Server Processing 26 ms Content Transfer 0 ms

A

CDN & Delivery

AWS CloudFront (Miss from cloudfront)

PASS

AWS CloudFront (Miss from cloudfront)

Site is served via AWS CloudFront CDN (edge: JFK50-P15)

Got: x-amz-cf-id: dYjYx3gbxaq_ihCtd3758ilPQnmtY843z81kRrxasMyjWXxVSSTUMg==

CDN cache status: Miss from cloudfront

CDN Detected: AWS CloudFront

Provider AWS CloudFront Cache Status Miss from cloudfront Evidence x-amz-cf-id: dYjYx3gbxaq_ihCtd3758ilPQnmtY843z81kRrxasMyjWXxVSSTUMg==