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 Amsterdam, Netherlands

200 OK

Checks

4 PASS 5 REVIEW

DNS Records

Action

1 A records, 301 ms lookup

REVIEW

1 A records, 301 ms lookup

Resolves to 1 IPv4 address(es)

Got: 23.220.113.184

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

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: cn-www.delta.com.edgekey.net

No NS records found

No MX records — email not configured via DNS

CAA records not checked

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

No SPF record found in TXT records

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

DNS resolution is slow (301 ms)

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Got: 301 ms

A	23.220.113.184
AAAA	—
CNAME	cn-www.delta.com.edgekey.net
NS	—
MX	—
TXT	—
CAA	Lookup not available with standard resolver

Resolved in 301 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

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)

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

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

HTTP version does not redirect to HTTPS

Got: HTTP 302 Expected: 301 redirect to HTTPS

www / non-www

200https://www.delta.com/

https://delta.com/

HTTP → HTTPS

302http://www.delta.com/ → http://ssp.delta.com/content/dam/delta-www/sorry-server/delta_sorry.html

HTTP version does not redirect to HTTPS

TLS Certificate Expiry & Recommendations

228 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

228

days left

0d 30d 60d 90d+

Recommended actions

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

CDN & Delivery

Akamai

REVIEW

Akamai

Site is served via Akamai CDN

Got: x-akamai-transformed: 9 10357 0 pmb=mTOE,1mRUM,2

CDN Detected: Akamai

Provider Akamai Evidence x-akamai-transformed: 9 10357 0 pmb=mTOE,1mRUM,2

A+

Redirect Chain

No redirects — direct access

PASS

No redirects — direct access

Got: https://www.delta.com

https://www.delta.com

199 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://www.delta.com	200	199 ms	HTTP/1.1	AmazonS3

A+

Crawlability

robots.txt present, sitemap with 696 URLs

PASS

robots.txt present, sitemap with 696 URLs

robots.txt is present

Got: 6080 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 696 entries

robots.txt references sitemap

robots.txt 200 OK

Size 6080 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed

User-agent: *


# If you are reading this looking for a means of reporting a security issue, please see security.txt @ https://www.delta.com/us/en/legal/vulnerability-disclosure-guidelines


# Allow Individual Pages

Allow: /egift/eGiftPurchase.action

Allow: /profile/enrolllanding.action

Allow: /etc/designs/global/clientlib-overview.css


# Allow Individual .jsp Pages

Allow: /index.jsp

Allow: /components/popups/skymark/terms.jsp

Allow: /deltareservemqm/mbrLanding.action

Allow: /app_links/join_skymiles/index.jsp

Allow: /awards/skymark/landing/index.jsp

Allow: /privacy_security/index.jsp

Allow: /worldwide_sites/index.jsp

Allow: /cns/travel/flight_notification/index.jsp

Allow: /components/help/apps/booking/fare_class.jsp

Allow: /mqm-calculator/help/class.jsp


# Allow Subfolders with .jsp pages

Allow: /about_delta/

Allow: /business_programs_services/

Allow: /care/

Allow: /help/

Allow: /legal/

Allow: /marketing/

Allow: /planning_reservations/

Allow: /prog_serv/

Allow: /skymiles/

Allow: /travel/

Allow: /traveling_checkin/


# Allow App Subfolders

Allow: /buygftxfer/

Allow: /contactus/

Allow: /baggage/

Allow: /profile/

Allow: /cns/

Allow: /inside/

Allow: /schedules/

Allow: /travel-agency/

Allow: /emailus/

Allow: /dlsearch/

Allow: /skyclub/*.action

Allow: /merch/shop*.action

Allow: /home/devicetype


# Disallow file types

Disallow: /*.jsp

Disallow: /*.pdf


# Disallow generated pages

Disallow: /flight-status/

Disallow: /flight-status

Disallow: *flight-status*

Disallow: /flight-status/*

Disallow: *cacheKey*

Disallow: /*cacheKey*

Disallow: /*?*cacheKeySuffix=

Disallow: *?*paymentRef=

Disallow: /site-search?searchTerm=*

Disallow: /profile/enrolllanding.action?partnerCd*

Disallow: /merch/searchHotelAction.action?locationCode*

Disallow: /merch/searchCarAction.action?locationCode*

Disallow: /edoc/displayEdocTNC.action*

Disallow: /edoc/redeemDocuments.action?action=*

Disallow: /air-shopping/findFlights.action*

Disallow: /flight-search/book-a-flight?cacheKeySuffix=

Disallow: /flight-search/search?&tripType=

Disallow: /flight-search/search?action=

Disallow: /custlogin/showResetPassword.action*

Disallow: /flight-search-2/

Disallow: /search*

Disallow: /sitesearch*

Disallow: /flightstatus/search/*

Disallow: /refund-status/search

Disallow: /air-shopping/searchflights.action

Disallow: /merch/merch/searchCarAction.action

Disallow: /my-trips/upcoming-trips

Disallow: /mytrips/printItinerary

Disallow: /reshop/

Disallow: /cartreshop/activity/reshopPurchase.action

Disallow: /contactus/pages/business_programs_services/agency_irop/index.jsp

Disallow: /edoc/displayEdocTnC.action*

Disallow: /mypromos/registerPromotion.action

Disallow: /profile/promotionconfirm.action*

Disallow: /skyclub/purchasemembership_removePromotion.action

Disallow: /profile/enrollconfirm.action


# Disallow Subfolders

Disallow: /home

Disallow: /home/

Disallow: /completepurchase

Disallow: /complete-purchase

Disallow: /flightsearch/book-a-flight?cacheKeySuffix=

Disallow: /lib*

Disallow: /etc*

Disallow: /cart/

Disallow: /customerprofile/

Disallow: /edocviewer/

Disallow: /oci/

Disallow: /onlinerefunds/

Disallow: /PCCOciWeb/

Disallow: /smlogin/

Disallow: /widgetnav/

Disallow: /acctmaint/

Disallow: /intranetlink/

Disallow: /booking/

Disallow: /contactus/shared

Disallow: /content/dam/delta-www/pdfs/

Disallow: /seat/

Disallow: /components/

Disallow: /content/www/reference/

Disallow: /content/www/en_us/offers-and-redirects

Disallow: /content/campaigns/

Disallow: /myitinerary/

Disallow: /custlogin/

Disallow: /cartalacarte/

Disallow: /air-shopping/

Disallow: /air-shopping/*

Disallow: /air-shopping*

Disallow: /agency-refund/


# Disallow Individual App Pages

Disallow: /book/activity/confirmation.action

Disallow: /mytrips/printItinerary.action

Disallow: /mydelta/receiptDetailsPage

Disallow: /mydelta/receiptDetailsPage.action

Disallow: /mydelta/vacationReceiptDetailsPage

Disallow: /mydelta/walletMyReceiptSummary

Disallow: /mydelta/walletMyVoucherSummary


# Disallow smt links

Disallow: /*smt-silver.html

Disallow: /*smt-platinum.html

Disallow: /*smt-gold.html

Disallow: /*smt-diamond.html

Disallow: /*smt-loggedIn.html

Disallow: /*smt-member.html


# Disallow Secondary Content Pages

Disallow: /apac/en/

Disallow: /br/en/

Disallow: /ca/en/

Disallow: /cn/en/

Disallow: /eu/en/

Disallow: /fr/en/

Disallow: /gb/en/

Disallow: /jp/en/

Disallow: /kr/en/

Disallow: /lac/en/

Disallow: /mea/en/

Disallow: /mx/en/

Disallow: /eu/es/

Disallow: /lac/es/

Disallow: /mx/es/

Disallow: /eu/fr/

Disallow: /ca/fr/

Disallow: /eu/pt/

Disallow: /intl/en/

Disallow: /global/en/

Disallow: /content/www/apac/en/

Disallow: /content/www/br/en/

Disallow: /content/www/ca/en/

Disallow: /content/www/cn/en/

Disallow: /content/www/eu/en/

Disallow: /content/www/fr/en/

Disallow: /content/www/gb/en/

Disallow: /content/www/jp/en/

Disallow: /content/www/kr/en/

Disallow: /content/www/lac/en/

Disallow: /content/www/mea/en/

Disallow: /content/www/mx/en/

Disallow: /content/www/eu/es/

Disallow: /content/www/lac/es/

Disallow: /content/www/mx/es/

Disallow: /content/www/eu/fr/

Disallow: /content/www/ca/fr/

Disallow: /content/www/eu/pt/

Disallow: /content/www/intl/en/

Disallow: /content/www/global/en/

Disallow: /content/www/us/en.html

Disallow: /index.html

Disallow: /us/en/spiritofdelta

Disallow: /content/www/us/en/spiritofdelta.html

Disallow: /us/en/home

Disallow: /home_mach

Disallow: */home_mach

Disallow: /giftcards/amex

Disallow: /egift/eGiftPurchase.action*

Disallow: /egift*

Disallow: /seats

Disallow: /seats*



# Disallow Secondary Home Pages

Disallow: /apac/en

Disallow: /br/en

Disallow: /ca/en

Disallow: /cn/en

Disallow: /eu/en

Disallow: /fr/en

Disallow: /gb/en

Disallow: /jp/en

Disallow: /kr/en

Disallow: /lac/en

Disallow: /mea/en

Disallow: /mx/en

Disallow: /eu/es

Disallow: /lac/es

Disallow: /mx/es

Disallow: /eu/fr

Disallow: /ca/fr

Disallow: /eu/pt


Sitemap:  https://www.delta.com/sitemap.xml

sitemap.xml 200 OK

Type URL Set URLs 696 entries Valid XML Yes

Sample URLs:

A+

Domain Intelligence

delta.com — via Corsearch Domains LLC, 32 years, 10 months old, hosted on VERCARA - Vercara, LLC, US

PASS

delta.com — via Corsearch Domains LLC, 32 years, 10 months old, hosted on VERCARA - Vercara, LLC, US

Domain registered until Nov 22, 2026 (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: Corsearch Domains LLC

Hosting: VERCARA - Vercara, LLC, US

Got: AS12008

Domain expiry

133 days

November 22, 2026

SSL certificate

228 days

Issued by DigiCert Inc

Domain age

32 years, 10 months

Registered November 23, 1993

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

VERCARA - Vercara, LLC, US

ASN AS12008

204.74.99.103

Registrar

Corsearch Domains LLC

Lock status unknown 6 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 Corsearch Domains LLC

Created November 23, 1993 (32 years, 10 months ago)

Expires November 22, 2026 (7 months)

Last Updated October 21, 2025

Name Servers edns2.ultradns.biz, edns2.ultradns.com, edns2.ultradns.net, edns2.ultradns.org, ns93.ultradns2.com, ns93.ultradns2.org

DNSSEC Not enabled

Hosting

IP Address 204.74.99.103

ASN AS12008 (VERCARA - Vercara, LLC, US)

Provider VERCARA - Vercara, LLC, US

Data source: rdap (1.0s)

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

PASS

DNS Lookup

68 ms

TCP Connect

1 ms

TLS Handshake

4 ms

Time to First Byte

241 ms

Total Time

241 ms

Connection waterfall

DNS Lookup 68 ms TCP Connect 1 ms TLS Handshake 4 ms Server Processing 168 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.