ieji.de

ie.prot.li, ld.prot.li, sh.prot.li

Found

Parent zone

de

Delegation from

a.nic.de (194.0.0.53)

NS at the parent

ie.prot.li, ld.prot.li, sh.prot.li

NS in the zone

ie.prot.li, ld.prot.li, sh.prot.li

Checks

• ✓ 3 nameservers #6

  Delegated to ie.prot.li, ld.prot.li, sh.prot.li.
• ✓ Parent and zone agree #7

  The parent delegation and the zone's NS records list the same nameservers.
• ✓ 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 one network

  all IPv4 addresses are in 91.207.248.0/24; all IPv6 addresses are in 2a13:8240:203::/48. A single network failure takes all nameservers down; RFC 2182 recommends topologically separate networks (anycast setups are an exception).

  #10
• i

  All nameservers in one AS

  All nameserver addresses are announced by one network operator (AS60439 (SERVERNET-AS - SERVERNET INTERNET LIMITED, GB): 6 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 .li

  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
• ✓ All reachable over IPv6 #13

  Every nameserver has an IPv6 address.

6 of 6 addresses answer authoritatively

Found

Checks

• ✓ All respond #14

  All 6 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: ld.prot.li (2a13:8240:203:18::62).

  #20
• ✓ Public addresses #21

  All nameserver addresses are publicly routable.

serial 1792622407 · primary sh.prot.li

Found

Primary (MNAME)

sh.prot.li

Contact (RNAME)

hostmaster.prot.li

Serial

1792622407

Refresh / retry

7200 s / 2000 s

Expire

1209600 s

Negative TTL

300 s

Serial per nameserver

Checks

• !

  Serials differ

  The nameservers serve different versions of the zone: 1792622407 on ie.prot.li (91.207.248.61), ie.prot.li (2a13:8240:203:18::61), sh.prot.li (91.207.248.60), sh.prot.li (2a13:8240:203:18::60); 2026102002 on ld.prot.li (91.207.248.62), ld.prot.li (2a13:8240:203:18::62). 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 2h, retry 33m20s, expire 14d, negative TTL 5m.
• ✓ Primary is a public nameserver #24

  The primary nameserver sh.prot.li is one of the listed nameservers.
• ✓ Contact hostmaster@prot.li #25

  The SOA RNAME hostmaster.prot.li means hostmaster@prot.li.
• ✓ Timestamp serial #26

  The serial 1792622407 is a Unix timestamp (2026-10-21 22:40 UTC).