Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
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
BCrawlabilityrobots.txt present, no sitemapREVIEW
A sitemap helps search engines discover and index your pages more efficiently.
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
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
# If you would like to crawl GitHub contact us via https://support.github.com?tags=dotcom-robots
# We also provide an extensive API: https://docs.github.com
User-agent: bingbot
Disallow: /ekansa/Open-Context-Data
Disallow: /ekansa/opencontext-*
Disallow: /account-login
Disallow: */tarball/
Disallow: */zipball/
Disallow: /Explodingstuff/
Disallow: /copilot/
Disallow: /copilot/c/
User-agent: adidxbot
Disallow: /ekansa/Open-Context-Data
Disallow: /ekansa/opencontext-*
Disallow: /account-login
Disallow: */tarball/
Disallow: */zipball/
Disallow: /Explodingstuff/
Disallow: /copilot/
Disallow: /copilot/c/
User-agent: BingPreview
Disallow: /ekansa/Open-Context-Data
Disallow: /ekansa/opencontext-*
Disallow: /account-login
Disallow: */tarball/
Disallow: */zipball/
Disallow: /Explodingstuff/
Disallow: /copilot/
Disallow: /copilot/c/
User-agent: baidu
crawl-delay: 1
User-agent: *
Disallow: /*/*/pulse
Disallow: /*/*/projects
Disallow: /*/*/forks
Disallow: /*/*/issues/new
Disallow: /*/*/milestones/new
Disallow: /*/*/issues/search
Disallow: /*/*/commits/
Disallow: /*/*/branches
Disallow: /*/*/contributors
Disallow: /*/*/tags
Disallow: /*/*/stargazers
Disallow: /*/*/watchers
Disallow: /*/*/network
Disallow: /*/*/graphs
Disallow: /*/*/compare
Disallow: /*/tree/
Disallow: /gist/
Disallow: /*/download
Disallow: /*/revisions
Disallow: /*/commits/*?author
Disallow: /*/commits/*?path
Disallow: /*/comments
Disallow: /*/archive/
Disallow: /*/blame/
Disallow: /*/raw/
Disallow: /*/cache/
Disallow: /.git/
Disallow: */.git/
Disallow: /*.git$
Disallow: /search/advanced
Disallow: /search$
Disallow: /*q=
Disallow: /*.atom$
Disallow: /ekansa/Open-Context-Data
Disallow: /ekansa/opencontext-*
Disallow: */tarball/
Disallow: */zipball/
Disallow: /*source=*
Disallow: /*ref_cta=*
Disallow: /*plan=*
Disallow: /*return_to=*
Disallow: /*ref_loc=*
Disallow: /*setup_organization=*
Disallow: /*source_repo=*
Disallow: /*ref_page=*
Disallow: /*source=*
Disallow: /*referrer=*
Disallow: /*report=*
Disallow: /*author=*
Disallow: /*since=*
Disallow: /*until=*
Disallow: /*commits?author=*
Disallow: /*report-abuse?report=*
Disallow: /*tab=*
Allow: /*?tab=achievements&achievement=*
Disallow: /account-login
Disallow: /Explodingstuff/
Disallow: /copilot/
Disallow: /copilot/c/
No sitemap found
Adding a sitemap helps search engines discover your pages.
BTLS Certificate Expiry & Recommendations56 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Submit your domain to hstspreload.org to be added to the Chrome preload list
- 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 Records1 A records, 42 ms lookupPASS
| A | 140.82.121.3 |
| AAAA | — |
| CNAME | — |
| NS | dns1.p08.nsone.net, dns3.p08.nsone.net, dns4.p08.nsone.net, dns2.p08.nsone.net, ns-520.awsdns-01.net, ns-1707.awsdns-21.co.uk, ns-421.awsdns-52.com, ns-1283.awsdns-32.org |
| MX | 0 github-com.mail.protection.outlook.com |
| TXT | facebook-domain-verification=39xu4jzl7roi7x0n93ldkxjiaarx50 MS=6BF03E6AF5CB689E315FB6199603BABF2C88D805 shopify-verification-code=t1YPwcmvnxZyBycaCpk1MPyWoFs72o krisp-domain-verification=ZlyiK7XLhnaoUQb2hpak1PLY7dFkl1WE docusign=087098e3-3d46-47b7-9b4e-8a23028154cd loom-site-verification=f3787154f1154b7880e720a511ea664d google-site-verification=82Le34Flgtd15ojYhHlGF_6g72muSjamlMVThBOJpks MS=ms44452932 SPF v=spf1 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks... apple-domain-verification=RyQhdzTl6Z6x8ZP4 calendly-site-verification=at0DQARi7IZvJtXQAWhMqpmIzpvoBNF7aam5VKKxP google-site-verification=UTM-3akMgubp6tQtgEuAkYNYLyYAvpTnnSrDMWoDR3o jamf-site-verification=XtaPNIYghF_e_xRDI8CjgQ stripe-verification=f88ef17321660a01bab1660454192e014defa29ba7b8de9633c69d6b4912... miro-verification=d2e174fdb00c71e0bcf58f8e58c3da2dd80dcfa9 MS=ms58704441 atlassian-domain-verification=jjgw98AKv2aeoYFxiL/VFaoyPkn3undEssTRuMg6C/3Fp/iqhk... TAILSCALE-xOzoDvFUzZr5YYVCQFuD adobe-idp-site-verification=b92c9e999aef825edc36e0a3d847d2dbad5b2fc0e05c79ddd7a1... |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
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.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
A+Redirect ChainNo redirects — direct accessPASS
https://github.com
87 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://github.com | 200 | 87 ms | HTTP/1.1 | github.com |
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligencegithub.com — via MarkMonitor Inc., 18 years, 9 months old, hosted on GitHub PagesPASS
89 days
October 9, 2026
56 days
Issued by Sectigo Limited
18 years, 9 months
Registered October 9, 2007
Not enabled
Protects against DNS spoofing
GitHub Pages
ASN AS36459
140.82.121.3
MarkMonitor Inc.
Expiry timeline
Recommended actions
- Renew the domain or enable auto-renewal to prevent accidental expiry
- Enable DNSSEC to protect visitors from DNS spoofing
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