airbnb.de

Checked 21 October 2026, 21:28 UTC · via 8.8.8.8
!Passed with warnings
22 passed 3 warnings 0 failed 4 info

Registration

info

.de country-code

Found

TLD
.de (country-code)
ICANN policies apply
no

Checks

  • i
    .de is a country-code TLD (ccTLD)
    Country-code TLD: governed by its local registry under national policy, not by an ICANN contract. Registrar accreditation, dispute resolution and RDAP/WHOIS rules are set by the registry.
    #1
  • ✓ TLD delegated and signed #2
    .de is delegated in the root zone and DNSSEC-signed.
  • i
    Registration data not available
    No registration data via RDAP: the registry of .de offers no RDAP service. Many ccTLD registries don't offer RDAP; check the registry's WHOIS instead.
    #3

Delegation

pass

dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns-1087.awsdns-07.org, ns-1877.awsdns-42.co.uk, ns-394.awsdns-49.com, ns-949.awsdns-54.net

Found

Parent zone
de
Delegation from
a.nic.de (194.0.0.53)
NS at the parent
dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns-1087.awsdns-07.org, ns-1877.awsdns-42.co.uk, ns-394.awsdns-49.com, ns-949.awsdns-54.net
NS in the zone
dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns-1087.awsdns-07.org, ns-1877.awsdns-42.co.uk, ns-394.awsdns-49.com, ns-949.awsdns-54.net
NameserverAddressesNetwork (AS)Glue
dns1.p01.nsone.net198.51.44.1 2620:4d:4000:6259:7:1:0:1AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns2.p01.nsone.net198.51.45.1 2a00:edc0:6259:7:1::2AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns3.p01.nsone.net198.51.44.65 2620:4d:4000:6259:7:1:0:3AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns4.p01.nsone.net198.51.45.65 2a00:edc0:6259:7:1::4AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
ns-1087.awsdns-07.org205.251.196.63 2600:9000:5304:3f00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1877.awsdns-42.co.uk205.251.199.85 2600:9000:5307:5500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-394.awsdns-49.com205.251.193.138 2600:9000:5301:8a00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-949.awsdns-54.net205.251.195.181 2600:9000:5303:b500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 8 nameservers #6
    Delegated to dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns-1087.awsdns-07.org, ns-1877.awsdns-42.co.uk, ns-394.awsdns-49.com, ns-949.awsdns-54.net.
  • ✓ 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 different networks #10
    The nameservers are spread over 6 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS16509 (AMAZON-02 - Amazon.com, Inc., US): 8 addresses; AS62597 (NSONE - NSONE Inc, US): 8 addresses.
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

16 of 16 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.p01.nsone.net 198.51.44.1NOERROR, 6 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns1.p01.nsone.net 2620:4d:4000:6259:7:1:0:1NOERROR, 6 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns2.p01.nsone.net 198.51.45.1NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns2.p01.nsone.net 2a00:edc0:6259:7:1::2NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns3.p01.nsone.net 198.51.44.65NOERROR, 6 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns3.p01.nsone.net 2620:4d:4000:6259:7:1:0:3NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns4.p01.nsone.net 198.51.45.65NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns4.p01.nsone.net 2a00:edc0:6259:7:1::4NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
ns-1087.awsdns-07.org 205.251.196.63NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1087.awsdns-07.org 2600:9000:5304:3f00::1NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns-1877.awsdns-42.co.uk 205.251.199.85NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1877.awsdns-42.co.uk 2600:9000:5307:5500::1NOERROR, 11 ms, authoritativenoyes / yesrefused-
ns-394.awsdns-49.com 205.251.193.138NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-394.awsdns-49.com 2600:9000:5301:8a00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-949.awsdns-54.net 205.251.195.181NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-949.awsdns-54.net 2600:9000:5303:b500::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: dns1.p01.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns2.p01.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns3.p01.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns4.p01.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9".
    #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.

SOA

warn

serial 1783450017 · primary dns1.p02.nsone.net

Found

Primary (MNAME)
dns1.p02.nsone.net
Contact (RNAME)
hostmaster.nsone.net
Serial
1783450017
Refresh / retry
43200 s / 7200 s
Expire
1209600 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
dns1.p01.nsone.net (198.51.44.1)1783450017
dns1.p01.nsone.net (2620:4d:4000:6259:7:1:0:1)1783450017
dns2.p01.nsone.net (198.51.45.1)1783450017
dns2.p01.nsone.net (2a00:edc0:6259:7:1::2)1783450017
dns3.p01.nsone.net (198.51.44.65)1783450017
dns3.p01.nsone.net (2620:4d:4000:6259:7:1:0:3)1783450017
dns4.p01.nsone.net (198.51.45.65)1783450017
dns4.p01.nsone.net (2a00:edc0:6259:7:1::4)1783450017
ns-1087.awsdns-07.org (205.251.196.63)1
ns-1087.awsdns-07.org (2600:9000:5304:3f00::1)1
ns-1877.awsdns-42.co.uk (205.251.199.85)1
ns-1877.awsdns-42.co.uk (2600:9000:5307:5500::1)1
ns-394.awsdns-49.com (205.251.193.138)1
ns-394.awsdns-49.com (2600:9000:5301:8a00::1)1
ns-949.awsdns-54.net (205.251.195.181)1
ns-949.awsdns-54.net (2600:9000:5303:b500::1)1

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 1 on ns-1087.awsdns-07.org (205.251.196.63), ns-1087.awsdns-07.org (2600:9000:5304:3f00::1), ns-1877.awsdns-42.co.uk (205.251.199.85), ns-1877.awsdns-42.co.uk (2600:9000:5307:5500::1), ns-394.awsdns-49.com (205.251.193.138), ns-394.awsdns-49.com (2600:9000:5301:8a00::1), ns-949.awsdns-54.net (205.251.195.181), ns-949.awsdns-54.net (2600:9000:5303:b500::1); 1783450017 on dns1.p01.nsone.net (198.51.44.1), dns1.p01.nsone.net (2620:4d:4000:6259:7:1:0:1), dns2.p01.nsone.net (198.51.45.1), dns2.p01.nsone.net (2a00:edc0:6259:7:1::2), dns3.p01.nsone.net (198.51.44.65), dns3.p01.nsone.net (2620:4d:4000:6259:7:1:0:3), dns4.p01.nsone.net (198.51.45.65), dns4.p01.nsone.net (2a00:edc0:6259:7:1::4). 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 12h, retry 2h, expire 14d, negative TTL 1h.
  • i
    Hidden master
    The primary nameserver dns1.p02.nsone.net is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@nsone.net #25
    The SOA RNAME hostmaster.nsone.net means hostmaster@nsone.net.
  • ✓ Timestamp serial #26
    The serial 1783450017 is a Unix timestamp (2026-07-07 18:46 UTC).

DNSSEC

warn

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

Records

warn

18 records at the apex

Found

Read from
198.51.44.1:53
TypeValueTTL
SOAdns1.p02.nsone.net. hostmaster.nsone.net. 1783450017 43200 7200 1209600 36003600
NSdns1.p01.nsone.net.3600
NSdns2.p01.nsone.net.3600
NSdns3.p01.nsone.net.3600
NSdns4.p01.nsone.net.3600
NSns-1877.awsdns-42.co.uk.3600
NSns-1087.awsdns-07.org.3600
NSns-394.awsdns-49.com.3600
NSns-949.awsdns-54.net.3600
A166.117.189.176272
A166.117.27.62272
TXT"9uNoLQpmJX1b2uOUlaRrp6fOXyCnO3+MPIi1n+Li1Cc="3600
TXT"facebook-domain-verification=jws6ipztb8psj1mpk4eej7v7jps3ga"3600
TXT"google-site-verification=tVvm902Dpoaa7psw00UEFnOzexEUMbs-LZwB1Ye4pow"3600
TXT"google-site-verification=isVKBQHItx8V_4NdgftzxafkDjdkFDboF0SwZvwU2gg"3600
TXT"v=spf1 -all"3600
CAA0 issue "digicert.com"300
CAA0 iodef "mailto:caa-alerts@airbnb.com"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (4m32s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 1d and in the zone 1h; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: digicert.com.