trolltech.com

5611.ns1.abovedomains.com, 5611.ns2.abovedomains.com

Found

Parent zone

com

Delegation from

a.gtld-servers.net (192.5.6.30)

NS at the parent

5611.ns1.abovedomains.com, 5611.ns2.abovedomains.com

NS in the zone

ns1.abovedomains.com, ns2.abovedomains.com

Checks

• i

  2 nameservers

  Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: 5611.ns1.abovedomains.com, 5611.ns2.abovedomains.com.

  #6
• !

  NS sets differ

  The nameservers at the parent and in the zone should be the same. 5611.ns1.abovedomains.com, 5611.ns2.abovedomains.com, ns1.abovedomains.com, ns2.abovedomains.com report NS ns1.abovedomains.com ns2.abovedomains.com. Only at the parent: 5611.ns1.abovedomains.com, 5611.ns2.abovedomains.com; only in the zone: ns1.abovedomains.com, ns2.abovedomains.com.

  #7
• ✓ No glue needed #8

  All nameservers are outside the zone, so no glue records are needed.
• ✓ All names resolve #9

  Every nameserver name has an address and is not an alias.
• ✓ Nameservers in different networks #10

  The nameservers are spread over 2 IPv4 /24s and 0 IPv6 /48s.
• i

  All nameservers in one AS

  All nameserver addresses are announced by one network operator (AS133618 (TRELLIAN-AS-AP - Trellian Pty. Limited, AU): 16 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

  #11
• i

  All nameserver names under .com

  All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

  #12
• !

  No IPv6

  None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

  #13

16 of 16 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 16 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.
• ✓ No version disclosed #17

  The nameservers don't reveal their software version.
• ✓ Zone transfers refused #18

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

  All nameservers answer over TCP.
• !

  No EDNS

  These nameservers don't support EDNS(0), needed for DNSSEC and answers larger than 512 bytes: 5611.ns1.abovedomains.com (103.224.182.9), 5611.ns1.abovedomains.com (103.224.182.77), 5611.ns1.abovedomains.com (103.224.212.9), 5611.ns1.abovedomains.com (103.224.182.85), 5611.ns2.abovedomains.com (103.224.182.10), 5611.ns2.abovedomains.com (103.224.212.53), 5611.ns2.abovedomains.com (103.224.212.10), 5611.ns2.abovedomains.com (103.224.212.51), ns1.abovedomains.com (103.224.182.77), ns1.abovedomains.com (103.224.182.9), ns1.abovedomains.com (103.224.182.85), ns1.abovedomains.com (103.224.212.9), ns2.abovedomains.com (103.224.212.10), ns2.abovedomains.com (103.224.212.53), ns2.abovedomains.com (103.224.212.51), ns2.abovedomains.com (103.224.182.10).

  #20
• ✓ Public addresses #21

  All nameserver addresses are publicly routable.

serial 2026102221 · primary ns1.abovedomains.com

Found

Primary (MNAME)

ns1.abovedomains.com

Contact (RNAME)

hostmaster.trellian.com

Serial

2026102221

Refresh / retry

10800 s / 3600 s

Expire

604800 s

Negative TTL

3600 s

Serial per nameserver

Checks

• !

  Serials differ

  The nameservers serve different versions of the zone: 2026102221 on 5611.ns1.abovedomains.com (103.224.182.9), 5611.ns1.abovedomains.com (103.224.182.77), 5611.ns1.abovedomains.com (103.224.212.9), 5611.ns1.abovedomains.com (103.224.182.85), 5611.ns2.abovedomains.com (103.224.182.10), 5611.ns2.abovedomains.com (103.224.212.51), ns1.abovedomains.com (103.224.182.77), ns1.abovedomains.com (103.224.182.9), ns1.abovedomains.com (103.224.182.85), ns1.abovedomains.com (103.224.212.9), ns2.abovedomains.com (103.224.212.51), ns2.abovedomains.com (103.224.182.10); 2026102222 on 5611.ns2.abovedomains.com (103.224.212.53), 5611.ns2.abovedomains.com (103.224.212.10), ns2.abovedomains.com (103.224.212.10), ns2.abovedomains.com (103.224.212.53). 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 3h, retry 1h, expire 7d, negative TTL 1h.
• ✓ Primary is a public nameserver #24

  The primary nameserver ns1.abovedomains.com is one of the listed nameservers.
• ✓ Contact hostmaster@trellian.com #25

  The SOA RNAME hostmaster.trellian.com means hostmaster@trellian.com.
• ✓ Date-based serial #26

  The serial 2026102221 follows the YYYYMMDDnn convention (2026-10-22).

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