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udemy.com

Checked 2026-10-22 11:14 UTC · first added 2026-10-21
!Passed with warnings Score 85 of 100

Domain & DNS

warn

26 passed 2 warn 0 failed

Areas

iRegistration iDelegation !Nameservers !SOA ✓DNSSEC iRecords

Problems

  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: anna.ns.cloudflare.com: "2026.10.2"; pete.ns.cloudflare.com: "2026.10.2". Hide or replace the version string.
    #17
  • !
    Unusual SOA timers
    SOA · negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 2h46m40s, retry 40m, expire 7d, negative TTL 1m.
    #23

Recent checks

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Full report

Domain & DNS report for udemy.com ›

Mail

warn

29 passed 3 warn 0 failed

Areas

✓SPF ✓DMARC !DKIM ✓DNSSEC !MX !TLS ✓BIMI

Problems

  • !
    Single MX host, no backup
    MX · Only one MX record found. For better email reliability, consider adding at least one backup MX server.
    #12
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: default (1024 bits), s1 (1024 bits), s2 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Not configured
    TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32

Recent checks

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Full report

Mail report for udemy.com ›