SurfaceMap › s › safaribooksonline.com

safaribooksonline.com

Checked 2026-10-22 10:33 UTC · first added 2026-10-21
✗Problems found Score 50 of 100

Domain & DNS

warn

23 passed 5 warn 0 failed

Areas

iRegistration !Delegation !Nameservers !SOA !DNSSEC !Records

Problems

  • !
    NS sets differ
    Delegation · The nameservers at the parent and in the zone should be the same. Only at the parent: a3-67.akam.net, a4-64.akam.net. a1-225.akam.net, a13-64.akam.net, a16-65.akam.net, a20-66.akam.net, a3-67.akam.net, a4-64.akam.net report NS a1-225.akam.net a13-64.akam.net a16-65.akam.net a20-66.akam.net.
    #7
  • !
    Software version disclosed
    Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: a1-225.akam.net: "41824.6"; a1-225.akam.net: "41824.4"; a13-64.akam.net: "41824.7"; a13-64.akam.net: "41824.11"; a16-65.akam.net: "48878.29"; a16-65.akam.net: "48878.33"; a20-66.akam.net: "48878.30"; a20-66.akam.net: "48878.27"; a3-67.akam.net: "41824.8"; a3-67.akam.net: "41824.11"; a4-64.akam.net: "48878.30"; a4-64.akam.net: "48878.26". Hide or replace the version string.
    #17
  • !
    Unusual SOA timers
    SOA · refresh 10m is outside 20m–1d; retry 30m should be shorter than refresh 10m. Current values: refresh 10m, retry 30m, expire 60d, negative TTL 1h.
    #23
  • !
    Not signed
    DNSSEC · The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32

Recent checks

!

Full report

Domain & DNS report for safaribooksonline.com ›

Mail

fail

16 passed 5 warn 2 failed

Areas

✗SPF ✗DMARC !DKIM !DNSSEC ✓MX !TLS iBIMI

Problems

  • ✗
    18 DNS lookups, over the limit of 10
    SPF · SPF record needs 18 DNS lookups (including nested includes), more than the limit of 10. Receivers will return a permerror; reduce includes or flatten the record.
    #2
  • ✗
    No DMARC record
    DMARC · No DMARC record was found for this domain. DMARC is essential for preventing email spoofing. Add a DMARC record with p=reject or at least p=quarantine.
    #5
  • !
    Uses deprecated ptr mechanism
    SPF · The ptr mechanism in SPF records is deprecated due to performance issues and should be avoided.
    #1
  • !
    Not enabled
    DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: google (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Key in test mode
    DKIM · These keys have t=y, so receivers treat DKIM failures as a test: google. Remove t=y once DKIM works.
    #24
  • !
    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

✗

Full report

Mail report for safaribooksonline.com ›