zastavy-vlajky.sk DNS Report

Health Score: 86%

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Checked: 5 months before

Parent

NS records at parent servers

ns3.websupport.sk [ 62.176.179.10 ]
ns2.websupport.sk [ 195.210.29.64 ]
ns1.websupport.sk [ 195.210.28.30 ]
[These were obtained from a.tld.sk.]

Glue at parent nameservers 7/7

SUCCESS Parent nameservers know A records for your domain, Very good !

NS

Mismatched glue 0/7

The glue provided by the root servers does not match glue that provided by your authoritative DNS servers.
(ns1.websupport.sk.	3600	IN	A	195.210.28.30) present at Parent, missing at (62.176.179.10, 195.210.29.64, 195.210.28.30)
(ns2.websupport.sk.	3600	IN	A	195.210.29.64) present at Parent, missing at (62.176.179.10, 195.210.29.64, 195.210.28.30)
(ns3.websupport.sk.	3600	IN	A	62.176.179.10) present at Parent, missing at (62.176.179.10, 195.210.29.64, 195.210.28.30)

Nameservers A records 0/7

Some servers does not provide A records for nameservers.
missing A record(s) for (ns3.websupport.sk,ns1.websupport.sk,ns2.websupport.sk) at nameserver 62.176.179.10
missing A record(s) for (ns1.websupport.sk,ns2.websupport.sk,ns3.websupport.sk) at nameserver 195.210.29.64
missing A record(s) for (ns2.websupport.sk,ns3.websupport.sk,ns1.websupport.sk) at nameserver 195.210.28.30

Nameservers report identical NS records 7/7

SUCCESS The NS records at all your nameservers are identical.

Nameservers respond 10/10

SUCCESS All of your nameservers listed at the parent nameservers responded.

Nameserver name validity 7/7

SUCCESS All of the NS records that your nameservers report are valid (no IPs or partial domain names).

Number of nameservers 5/5

SUCCESS You have 3 nameservers. You must have at least 2 nameservers (RFC2182 section 5 recommends at least 3 nameservers), and preferably no more than 7.

Lame nameservers 7/7

SUCCESS All the nameservers listed at the parent servers answer authoritatively for your domain.

Missing (stealth) nameservers 7/7

SUCCESS All your nameservers are also listed at the parent servers.

Root missing nameservers 7/7

SUCCESS All of the nameservers listed at the parent nameservers are also listed as NS records at your nameservers.

Nameservers on separate class C's 7/7

SUCCESS Nameservers are in a different networks.

public IPs 7/7

SUCCESS All of your NS records appear to use public IPs.

SOA

SOA record

SOA record is:
Hostmaster email
admin.websupport.sk
Serial
1555056408
Refresh
3600
Retry
2048
Expire
1048576
TTL
86400

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 1555056408 That means that all your nameservers are using the same data.

SOA MNAME 3/3

SUCCESS SOA (Start of Authority) record states that your master (primary) name server is: ns1.websupport.sk That server is listed at the parent servers, which is correct.

Serial value 1/1

SUCCESS SOA serial number is: 1555056408 This appears to be in the recommended format of YYYYMMDDnn, where 'nn' is the revision. This number must be incremented every time you make a DNS change.

Refresh value 1/1

SUCCESS SOA Retry interval is : 3600 seconds. This seems OK. (Values about 3600-7200 seconds is good if not using DNS NOTIFY; RFC1912 2.2 recommends a value between 1200 to 43200 seconds (20 minutes to 12 hours)). This value determines how often secondary/slave nameservers check with the master for updates.

Retry value 1/1

SUCCESS SOA Retry interval is : 2048 seconds. This seems OK. (Values about 120-7200 seconds is good). The retry value is the amount of time your secondary/slave nameservers will wait to contact the master nameserver again if the last attempt failed.

Expire value 1/1

SUCCESS SOA Expire time is : 1048576 seconds. This seems OK. (Values 604800 to 2419200 seconds (1-4 weeks) is good). RFC1912 suggests 2-4 weeks. This is how long a secondary/slave nameserver will wait before considering its DNS data stale if it can't reach the primary nameserver.

TTL value 1/1

SUCCESS SOA Expire time is : 86400 seconds. This seems OK. (about 300 to 86400 seconds or 5 min - 24 hours is good). RFC2308 suggests a value of 1-3 hours. This value used to determine the default (technically, minimum) TTL (time-to-live) for DNS entries, but now is used for negative caching.

Info

DNS trace

Trace to zastavy-vlajky.sk
lookup zastavy-vlajky.sk at A.ROOT-SERVERS.NET(198.41.0.4) 77 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to a.tld.sk(194.0.45.1)
lookup zastavy-vlajky.sk at a.tld.sk(194.0.45.1) 102 ms
a.tld.sk(194.0.45.1) refer to ns2.websupport.sk(195.210.29.64)
lookup zastavy-vlajky.sk at ns2.websupport.sk(195.210.29.64) 112 ms
got A record 'zastavy-vlajky.sk IN A 37.9.175.19' from zastavy-vlajky.sk(195.210.29.64)
Total time: 291 ms