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https://discover.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
4
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 PASS 4 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
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.discover.com/
200https://discover.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://discover.com/ → https://discover.com/

Consistent

B
TLS Certificate Expiry & Recommendations
96 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

96
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
B
CDN & Delivery
Akamai
REVIEW
Akamai
Info::
Site is served via Akamai CDN
Got: server header
CDN Detected: Akamai
Provider Akamai Evidence server header
A+
DNS Records
1 A records, 195 ms lookup
PASS
1 A records, 195 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 23.214.153.186
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
6 nameserver(s) configured
Got: a4-64.akam.net, a8-66.akam.net, a5-67.akam.net, a6-65.akam.net, a3-64.akam.net, a1-23.akam.net
Info::
2 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: 195 ms
Got: 195 ms
A23.214.153.186
AAAA—
CNAME—
NSa4-64.akam.net, a8-66.akam.net, a5-67.akam.net, a6-65.akam.net, a3-64.akam.net, a1-23.akam.net
MX
10 mxb-001d7a03.gslb.pphosted.com
10 mxa-001d7a03.gslb.pphosted.com
TXT
miro-verification=83418712c8125e0254c79b098863f8659af6930c
onetrust-domain-verification=0c4765e5156f4e78b36dc2f1d305673a
smartsheet-site-validation=Iv9fVsrnPZvM4cBbmLjkfbHVhq2K0_2i
liveramp-site-verification=jX1k2k5MDwCmq1tnItOg2-YG2a_PyoJqBChf0Sz9MIk
_pzgmyka5aljqxxn77ir3v3koefwskh5
jamf-site-verification=_KaTb5rtYKzVLTIrdhYvjQ
adobe-idp-site-verification=7f07dde30af8df4fd20d31d40218629bf64f7526c0167389c85b...
_7ww1a1mmc70wcsyuibm5tfyl98kw7jq
atlassian-domain-verification=ZRP73NoVRbStETwopgeDhJUz4YP/WitUqaGB2j8LbZ0eBBhnDY...
_g388o34hath14j4pf1ekm9iaceu58vo
_09q3bamtp2c0tr5ftvvk1n4yjvj0pw1
segment-site-verification=4buUSoY7ujgHSrmewrfwcxWf6YtjSQAJ
segment-site-verification=rGSHgJVcEYlpxLyjEyTPWbUGz5v9VQ6V
cisco-ci-domain-verification=272cdfb51736fedef16cfe09950f59b883d3a08d89829f5a895...
mongodb-site-verification=eTTHxouNWqnRHzQEjrqlvYEITei4I1tB
SPF v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
_0gffxxzk749xgqldbw2rvg3cfoomsdo
onetrust-domain-verification=64cd9b1790f24b6290cd627d4e90c9bc
_sv5vkhrn9iysjygrzn89ghamhjat3tt
google-site-verification=Ck4DD5rX8PTce9sLBn5-bOTFRXuqZ4ri3HndolHcLvs
google-site-verification=VbNflIwyH0KM0Td8gC-bDXZKnC8cZ6IpYurg5LRs65o
CAALookup not available with standard resolver
Resolved in 195 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.

A
Redirect Chain
1 redirect(s), 198 ms total
PASS
1 redirect(s), 198 ms total
Info::
Single redirect
Got: https://discover.com → https://www.discover.com/ (301)
Info::
WWW normalization redirect

https://discover.com

89 ms · HTTP/1.1

301

https://www.discover.com/

110 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://discover.com30189 msHTTP/1.1AkamaiGHost
2https://www.discover.com/200110 msHTTP/1.1Apache

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 963 URLs
PASS
robots.txt present, sitemap with 963 URLs
Info::
robots.txt is present
Got: 2107 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 963 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2107 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
sitemap: https://www.discover.com/site-map.xml
user-agent: *
#begin directives to prevent crawling 
# START Card
disallow: /.well-known/pki-validation/fileauth.txt
disallow: /cln*
disallow: /content/dam/dfs/credit-cards/applications/nic/assets/pki/fileauth.txt
disallow: /credit-cards/exclusives/5percent-current-offer.html
disallow: /credit-cards/exclusives/applepay-support/index.html
disallow: /credit-cards/digital-wallets/applepayredeem/
disallow: /credit-cards/member-benefits/my-offers.html
disallow: /maintenance.html
disallow: /membership-registration
disallow: /merchant
disallow: /messageus/
disallow: /mobile/install.html
disallow: /nic/.well-known/pki-validation/fileauth.txt
disallow: /online-media-kit
disallow: /technical-error.html
disallow: /content/dam/discover/en_us/credit-cards/card-acquisitions/global/js/at.js
disallow: /products*
disallow: /?ef_id*
disallow: /?iq_id*
disallow: /?irgwc*
disallow: /?pid*
disallow: /?sid*
disallow: /?source=infosec-jobs*
disallow: /?source=post_page*
disallow: /credit-cards/card-smarts/wp-admin*
disallow: /credit-cards/card-smarts/wp-login*
disallow: /credit-cards/card-smarts/access-account-with-mobile-apps//1d9riyv85.html
disallow: /credit-cards/card-smarts/access-account-with-mobile-apps//achj37v85.html
disallow: /credit-cards/card-smarts/access-account-with-mobile-apps//d9g1ncv85.html
disallow: /credit-cards/card-smarts/are-student-credit-cards-only-for-students/?channel=LINK
disallow: /credit-cards/card-smarts/credit-card-minimum-paymenthttps://www.discover.com/credit-cards/card-smarts/credit-card-minimum-payment
disallow: /credit-cards/card-smarts/how-to-increase-credit-limithttps://www.discover.com/credit-cards/card-smarts/how-to-increase-credit-limit
disallow: /credit-cards/card-smarts/qualify-for-a-higher-credit-limithttps://www.discover.com/credit-cards/card-smarts/qualify-for-a-higher-credit-limit
disallow: /credit-cards/card-smarts/what-is-post-date-in-credit-cardshttps://www.discover.com/credit-cards/card-smarts/what-is-post-date-in-credit-cards
disallow: /credit-cards/browser-support/hardware-software-requirements/
sitemap.xml 200 OK
Type URL Set URLs 963 entries Valid XML Yes
Sample URLs:
A+
Domain Intelligence
discover.com — via CSC Corporate Domains, Inc., 32 years, 10 months old, hosted on Akamai
PASS
discover.com — via CSC Corporate Domains, Inc., 32 years, 10 months old, hosted on Akamai
Info::
Domain registered until Nov 14, 2026 (6 months remaining)
Info::
DNSSEC is enabled
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: Akamai
Got: AS16625
Domain expiry

151 days

November 14, 2026

SSL certificate

96 days

Issued by DigiCert Inc

Domain age

32 years, 10 months

Registered November 15, 1993

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Akamai

ASN AS16625

23.214.153.186

Registrar

CSC Corporate Domains, Inc.

Unlocked 6 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar CSC Corporate Domains, Inc.
Created November 15, 1993 (32 years, 10 months ago)
Expires November 14, 2026 (6 months)
Last Updated November 10, 2025
Name Servers a1-23.akam.net, a3-64.akam.net, a4-64.akam.net, a5-67.akam.net, a6-65.akam.net, a8-66.akam.net
DNSSEC Enabled
Hosting
IP Address 23.214.153.186
ASN AS16625 (AKAMAI-AS - Akamai Technologies, Inc., US)
Provider Akamai
Data source: rdap (0.3s)

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

Connection waterfall

DNS Lookup 39 ms TCP Connect 25 ms TLS Handshake 27 ms Server Processing 36 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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