olympics.com

22 of 22 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 22 nameserver addresses answered.
• ✓ All authoritative #15

  Every responding nameserver answers authoritatively for the zone.
• ✓ No recursion #16

  The nameservers do not answer recursive queries for other domains.
• !

  Software version disclosed

  These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1-17.akam.net: "41824.6"; ns1-17.akam.net: "41824.11"; ns1-239.akam.net: "41824.7"; ns1-239.akam.net: "41824.8"; usc4.akam.net: "48878.26"; use4.akam.net: "48878.32"; use5.akam.net: "48878.27"; usw1.akam.net: "41824.8"; usw2.akam.net: "48878.32". Hide or replace the version string.

  #17
• ✓ Zone transfers refused #18

  No nameserver allows a zone transfer to the public.
• ✓ TCP supported #19

  All nameservers answer over TCP.
• ✓ EDNS supported #20

  All nameservers support EDNS(0).
• ✓ Public addresses #21

  All nameserver addresses are publicly routable.

serial 2020112701 · primary ns1-17.akam.net

Found

Primary (MNAME)

ns1-17.akam.net

Contact (RNAME)

ocs.techdev.olympicchannel.com

Serial

2020112701

Refresh / retry

3600 s / 600 s

Expire

604800 s

Negative TTL

300 s

Serial per nameserver

Checks

• !

  Serials differ

  The nameservers serve different versions of the zone: 2015010247 on ns11.constellix.com (96.45.80.1), ns11.constellix.com (2600:180a:1001::1), ns21.constellix.com (46.31.236.1), ns21.constellix.com (2600:180b:2001::1), ns31.constellix.com (43.247.170.1), ns31.constellix.com (2600:180c:3001::1), ns41.constellix.net (96.45.81.1), ns41.constellix.net (2600:180a:4001::1), ns51.constellix.net (46.31.237.1), ns51.constellix.net (2600:180b:5001::1), ns61.constellix.net (43.247.171.1), ns61.constellix.net (2600:180c:6001::1); 2020112701 on ns1-17.akam.net (193.108.91.17), ns1-17.akam.net (2600:1401:2::11), ns1-239.akam.net (193.108.91.239), ns1-239.akam.net (2600:1401:2::ef), usc4.akam.net (184.26.160.65), use4.akam.net (23.211.133.65), use5.akam.net (2.16.40.64), use5.akam.net (2600:1403:a::40), usw1.akam.net (23.61.199.66), usw2.akam.net (184.26.161.64). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.

  #22
• ✓ Timers within recommendations #23

  SOA refresh 1h, retry 10m, expire 7d, negative TTL 5m.
• ✓ Primary is a public nameserver #24

  The primary nameserver ns1-17.akam.net is one of the listed nameservers.
• ✓ Contact ocs@techdev.olympicchannel.com #25

  The SOA RNAME ocs.techdev.olympicchannel.com means ocs@techdev.olympicchannel.com.
• ✓ Date-based serial #26

  The serial 2020112701 follows the YYYYMMDDnn convention (2020-11-27).

Not signed

Found

Validated by resolver

no

Checks

• !

  Not signed

  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

51 records at the apex

Found

Read from

193.108.91.17:53

Checks

• !

  Very low TTLs

  These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). 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
• ✓ No CNAME at the apex #33

  The zone apex has no CNAME record.
• ✓ No wildcard #34

  Names that don't exist return NXDOMAIN.
• i

  No CAA records

  Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.

  #35