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Domainwikipedia.org
✓ 18 Pass ⚠ 5 Warn ✗ 1 Fail ℹ 9 Info
Action Items
Failures first, then warnings
Fail
NS Records
DNS servers responded
FAIL. Some nameserver IPv4 addresses did not respond.
Warn
DNSSEC
DS records
No DS records found at parent.
Warn
DNSSEC
DNSSEC chain
No DS records found at parent. Domain appears unsigned.
Warn
NS Records
TCP connections
Some nameservers do not accept TCP connections over IPv4. RFC 9210 requires DNS servers to support TCP to handle large responses.
Warn
NS Records
SOA serial consistency
SOA serial mismatch across IPv4 nameservers. This usually indicates that secondary nameservers are out of sync with the primary, causing inconsistent DNS responses.
Warn
SOA Record
SOA Retry
Retry: 7200 (2 hour(s)). Recommended range is 10 minutes to 1 hour.
PARENT
Info
Parent delegation records
Delegation NS records returned by parent zone org (b0.org.afilias-nst.org):
ns2.wikimedia.orgglue=[198.35.27.27, 2a02:ec80:53::1] resolved=[198.35.27.27, 2a02:ec80:53::1][TTL=172800] ns0.wikimedia.orgglue=[208.80.154.238, 2620:0:861:53::1] resolved=[208.80.154.238, 2620:0:861:53::1][TTL=172800] ns1.wikimedia.orgglue=[208.80.153.231, 2620:0:860:53::1] resolved=[208.80.153.231, 2620:0:860:53::1][TTL=172800]
PARENT
Pass
Nameservers listed at parent
Good. Parent server b0.org.afilias-nst.org has the nameservers listed.
PARENT
Pass
Nameserver IPv4 address records
Good. Every nameserver has IPv4 A records. IPv6 AAAA records are informational only.
PARENT
Pass
DNS Parent sent Glue
Good. Parent response included glue address records.
NS
Info
NS records
NS records from the nameservers. Address health checks validate IPv4 A records only.
ns0.wikimedia.org[208.80.154.238][TTL=21600] ns1.wikimedia.org[208.80.153.231][TTL=21600] ns2.wikimedia.org[198.35.27.27][TTL=21600]
NS
Pass
Recursive queries
Good. The nameservers do not allow recursive queries for outside hosts.
ns0.wikimedia.org 208.80.154.238 auth=ok recursion=closed tcp=ok serial=2026060420 ns1.wikimedia.org 208.80.153.231 auth=fail recursion=closed tcp=fail serial=— ns2.wikimedia.org 198.35.27.27 auth=ok recursion=closed tcp=ok serial=2026060420
NS
Pass
Multiple nameservers
Good. It have 3 nameservers. RFC2182 recommends at least 3.
NS
Pass
Different subnets
Good. Nameservers are on 3 different subnets.
NS
Pass
Public IPs
Good. All nameserver IPv4 addresses are public.
NS
Fail
DNS servers responded
FAIL. Some nameserver IPv4 addresses did not respond.
ns0.wikimedia.org 208.80.154.238 auth=ok recursion=closed tcp=ok serial=2026060420 ns1.wikimedia.org 208.80.153.231 auth=fail recursion=closed tcp=fail serial=— ns2.wikimedia.org 198.35.27.27 auth=ok recursion=closed tcp=ok serial=2026060420
NS
Warn
TCP connections
Some nameservers do not accept TCP connections over IPv4. RFC 9210 requires DNS servers to support TCP to handle large responses.
ns0.wikimedia.org 208.80.154.238 auth=ok recursion=closed tcp=ok serial=2026060420 ns1.wikimedia.org 208.80.153.231 auth=fail recursion=closed tcp=fail serial=— ns2.wikimedia.org 198.35.27.27 auth=ok recursion=closed tcp=ok serial=2026060420
NS
Pass
Delegation mismatch
Good. NS records match between parent and authoritative servers.
NS
Warn
SOA serial consistency
SOA serial mismatch across IPv4 nameservers. This usually indicates that secondary nameservers are out of sync with the primary, causing inconsistent DNS responses.
ns0.wikimedia.org 208.80.154.238 auth=ok recursion=closed tcp=ok serial=2026060420 ns1.wikimedia.org 208.80.153.231 auth=fail recursion=closed tcp=fail serial=— ns2.wikimedia.org 198.35.27.27 auth=ok recursion=closed tcp=ok serial=2026060420
SOA
Info
SOA record
SOA record details:
Primary NS : ns0.wikimedia.org Hostmaster : hostmaster@wikimedia.org Serial : 2026060420 Refresh : 43200 Retry : 7200 Expire : 1209600 Min TTL : 3600
SOA
Pass
SOA MNAME
OK. ns0.wikimedia.org is listed in the NS records.
SOA
Info
SOA Serial
Current SOA serial is 2026060420. Format looks correct (YYYYMMDDnn).
SOA
Pass
SOA Refresh
Refresh: 43200 (12 hour(s)). OK. Within recommended 1 to 24 hours range.
SOA
Warn
SOA Retry
Retry: 7200 (2 hour(s)). Recommended range is 10 minutes to 1 hour.
SOA
Pass
SOA Expire
Expire: 1209600 (14 day(s)). OK.
SOA
Pass
SOA Minimum TTL
Min TTL: 3600 (1 hour(s)). OK. RFC2308 recommends 1-3 hours for negative caching.
MX
Info
MX Records
Current MX records:
10 mx-in2001.wikimedia.org [208.80.153.75] 10 mx-in1001.wikimedia.org [208.80.155.102]
MX
Pass
MX count
Zone have 2 MX record(s). Good redundancy.
MX
Pass
MX IPv4 addresses are public
Good. All MX records use public IPv4 addresses.
MX
Pass
MX is hostname
Good. All MX records use hostnames, not IP addresses.
MX
Pass
MX CNAME check
OK. No CNAME records found for MX hosts.
MX
Pass
Reverse PTR records
PTR (reverse DNS) records for MX hosts:
208.80.153.75 → mx-in2001.wikimedia.org 208.80.155.102 → mx-in1001.wikimedia.org
DNSSEC
Warn
DS records
No DS records found at parent.
DNSSEC
Info
DNSKEY records
No DNSKEY records found at child.
DNSSEC
Warn
DNSSEC chain
No DS records found at parent. Domain appears unsigned.
WWW
Info
WWW A Record
www.wikipedia.org resolves to:
198.35.26.224
WWW
Info
WWW AAAA (IPv6)
IPv6 addresses:
2620:0:863:ed1a::1
WWW
Pass
WWW IPv4 addresses are public
Good. All WWW IPv4 addresses are public.
WWW
Info
WWW CNAME
www.wikipedia.org has a CNAME pointing to dyna.wikimedia.org.
Processed in 11.318s · Real DNS resolution via dnspython · Wed, 23 Sep 2026 20:39:35 GMT