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
User-agent: *
Disallow: /static/
Disallow: /welcome-guide/
Disallow: /benefits/
Disallow: /welcome-guide/
Disallow: /institutional-services/resources-for-volatile-markets/
Disallow: /solutions/
Disallow: /bonus-problems/
Disallow: /excel-obstacle-course/
Disallow: /logo-meaning/
Disallow: /quantitative-researcher/
Disallow: /apply-quantitative-researcher/
Disallow: /join-jane-street/exploding-offers/
Disallow: /enigmatologist-description-nyc/
Disallow: /enigmatologist-puzzle-nyc/
Disallow: /apply-enigmatologist-nyc-b5d9kfs0i1/
Disallow: /enigmatologist-description-ldn/
Disallow: /enigmatologist-puzzle-ldn/
Disallow: /apply-enigmatologist-ldn-agyl3jwr7n/
Disallow: /what-we-do/global-capital-markets/
Disallow: /puzzle-tutorials/
Disallow: /party-puzzle/
Disallow: /see-hkg-email.html
Disallow: /see-ldn-email.html
Disallow: /join-jane-street/position/7304961002/
Disallow: /join-jane-street/apply/7304961002/
Disallow: /web-app/
Disallow: /solved/
Disallow: /curious/
Disallow: /join-jane-street/interviewing-deep-dive/
Disallow: /join-jane-street/ml-research-interviews
Disallow: /join-jane-street/ml-engineer-interviews
No sitemap found
Adding a sitemap helps search engines discover your pages.
BTLS Certificate Expiry & Recommendations185 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
- 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
ADNS Records2 A records, 107 ms lookupPASS
| A | 13.248.239.113, 166.117.199.99 |
| AAAA | — |
| CNAME | janestreet.com |
| NS | ns-501.awsdns-62.com, ns-1215.awsdns-23.org, ns-613.awsdns-12.net, ns-1819.awsdns-35.co.uk |
| MX | 10 mxin1.mail.janestreet.com 10 mxin3.mail.janestreet.com 10 mxin4.mail.janestreet.com 10 mxin2.mail.janestreet.com |
| TXT | anthropic-domain-verification-1tvja2=TClVsR6hNQVZUIsw0Sc7y6xLv security_contact=mailto:security-txt-ea6d70@janestreet.com figma-domain-verification=776c503e3c6ceb675e7340a0819dd59a912de8e45105c6bc17ae68... SPF v=spf1 +ip4:38.105.200.78 +ip4:38.105.200.79 +ip4:64.215.233.18 +ip4:64.215.233.... adobe-idp-site-verification=6fcf8cf7306c175e36f705c53a3891c98e9b0db928234c098684... google-site-verification=A6LUH6cnfW5sYTr0INx_bV4lI2NWKJ6I9w4_0Epum7Y adobe-sign-verification=e0c7f457a2c211021e8b7028ddf8a770 goodnotes-verification=45639188-7d16-417a-b272-dd714f748430 jamf-site-verification=T00q6fdYWgzHJcw3O6QK6g smartsheet-site-validation=IGQuKGpF13IuzFsgbTvKb4BMYfxYVpFw atlassian-domain-verification=r9oLqXP1JpiBGHoDxohmjvNyysRGPnPfz3Hda1mpYWgL/jc2tc... _4tuir5rkiga8i5wvho3t2brhssiltnw uber-domain-verification=dc610b3f-750e-4d16-82e7-a8cd5e042fe5 sterling-domain-verification=a4014a90cc2b4f7a8408e324283e96a6 slack-domain-verification=CS4d25GXHEkYncSMArj1YB7GmY6Tb1d0PvCH28o7 MS=ms95726908 cisco-ci-domain-verification=51449fb45ce25667ce39943677a9d5629fa108cf92cf4ee8bd6... fxb7jqkw4y2k2dl22tfm6vdz1dxw2rs4 canva-site-verification=DOBZuEg-utLOzfmE2427DA 00D40000000Mzos=1TBPK00000000Pp |
| CAA | Lookup not available with standard resolver |
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
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.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
A+Redirect ChainNo redirects — direct accessPASS
https://www.janestreet.com
414 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://www.janestreet.com | 200 | 414 ms | HTTP/1.1 | nginx/1.14.1 |
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: www
HTTP → HTTPS
Consistent
A+Domain Intelligencejanestreet.com — via MarkMonitor Inc., 23 years, 6 months old, hosted on AWSPASS
548 days
January 11, 2028
185 days
Issued by Amazon
23 years, 6 months
Registered January 11, 2003
Not enabled
Protects against DNS spoofing
AWS
ASN AS16509
166.117.199.99
MarkMonitor Inc.
Expiry timeline
Recommended actions
- 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