Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations148 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
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 Records4 A records, 28 ms lookupPASS
| A | 13.33.243.119, 13.33.243.128, 13.33.243.92, 13.33.243.88 |
| AAAA | — |
| CNAME | — |
| NS | ns-1109.awsdns-10.org, ns-1014.awsdns-62.net, ns-13.awsdns-01.com, ns-1549.awsdns-01.co.uk |
| MX | 10 mxa-00593801.gslb.pphosted.com 10 mxb-00593801.gslb.pphosted.com |
| TXT | status-page-domain-verification=y08j3wqb2sw9 atlassian-sending-domain-verification=4a498916-8f31-4a42-b4ec-758ee24b79e4 google-site-verification=FJqQiq8r-ExkN9kiVDy44SL2wkm6VS8zka0HUkunGME atlassian-domain-verification=mBjfUMIIMEpsVsE5wql1jKvzxVpCWKZwpnSWFbY51pnIrp5nSd... atlassian-domain-verification=59aeShSTbEvs7cB33k4Wsvath8fOirTAy79UnAbOloto0AyhJb... SPF v=spf1 include:_spf.google.com include:sendgrid.net include:mail.zendesk.com inc... cursor-domain-verification-7zn380=ChGiB1Fhp14asve0cCXYyhxFn apple-domain-verification=iaobRRgsJ5xUkcuj facebook-domain-verification=q0sgl66mvrtj3ivlf1s98bn6gxvii2 |
| CAA | Lookup not available with standard resolver |
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
ARedirect Chain1 redirect(s), 130 ms totalPASS
https://udacity.com
7 ms · HTTP/1.1
https://www.udacity.com/
124 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://udacity.com | 301 | 7 ms | HTTP/1.1 | AmazonS3 |
| 2 | https://www.udacity.com/ | 200 | 124 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
A+Crawlabilityrobots.txt present, sitemap with 178 URLsPASS
# Applebot-Extended
User-agent: Applebot-Extended
Disallow: /
# *
User-agent: *
Allow: /
Disallow: /blog/wp-admin/admin-ajax.php
Disallow: /blog/wp-admin/options-general.php
Disallow: /blog/wp-admin/themes.php
Disallow: /blog/wp-admin/load-scripts.php
Disallow: /blog/wp-admin/upload.php
Disallow: /blog/wp-admin/load-styles.php
Disallow: /blog/wp-admin/plugins.php
Disallow: /blog/wp-admin/admin.php
Disallow: /blog/wp-admin/post.php
Disallow: /*?price
Disallow: /*?search
Disallow: /*?coupon
Disallow: /*?promo
Disallow: /*?checkoutType
Disallow: /*?school
Disallow: /*?skill
Disallow: /*?difficulty
Disallow: /*?duration
Disallow: /*?type
Disallow: /dashboard
Disallow: /settings/*
Disallow: /quick-checkout*
Disallow: /checkout/*
Disallow: /assessment/*
Disallow: /org/*
Disallow: /enrollment/*
Disallow: /flag/*
Disallow: /test/*
Disallow: /masters-artificial-intelligence/student-guide
Disallow: /mba-ai-product-management/student-guide
Disallow: /resources/*
Disallow: /*/404
# Host
Host: https://www.udacity.com
# Sitemaps
Sitemap: https://www.udacity.com/sitemap.xml
Sitemap: https://www.udacity.com/server-sitemap.xml
A+Domain Intelligenceudacity.com — via CSC Corporate Domains, Inc., 14 years, 5 months old, hosted on AWSPASS
582 days
January 17, 2028
148 days
Issued by Amazon
14 years, 5 months
Registered January 17, 2012
Not enabled
Protects against DNS spoofing
AWS
ASN AS16509
13.33.243.128
CSC Corporate Domains, Inc.
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
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.
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