servismanager.cz DNS Report

Health Score: 68%

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Checked: 1 week before

Parent

NS records at parent servers

ns.wedos.cz [ 46.28.104.67 ]
ns.wedos.eu
ns.wedos.com
ns.wedos.net
[These were obtained from a.ns.nic.cz.]

Glue at parent nameservers 0/7

WARNING The parent servers are not providing glue for all your nameservers. This means that they are supplying the NS records (host.example.com), but not supplying the A records. That may cause some extra milliseconds in DNS. This will usually occur if your DNS servers are not in the same TLD as your domain

NS

Mismatched glue 0/7

The glue provided by the root servers does not match glue that provided by your authoritative DNS servers.
(ns.wedos.cz.		3600	IN	A	46.28.104.67) present at Parent, missing at (213.136.87.214)
(ns.wedos.eu.		3600	IN	A	164.138.27.146) present at (164.138.27.146, 37.157.192.2), missing at Parent
(ns.wedos.com.		3600	IN	A	37.157.192.2) present at (164.138.27.146, 37.157.192.2), missing at Parent
(ns.wedos.net.		300	IN	A	213.136.87.214) present at (164.138.27.146, 37.157.192.2), missing at Parent

Nameservers A records 0/7

Some servers does not provide A records for nameservers.
missing A record(s) for (ns.wedos.cz,ns.wedos.eu,ns.wedos.com,ns.wedos.net) at nameserver 213.136.87.214

Nameservers report identical NS records 7/7

SUCCESS The NS records at all your nameservers are identical.

Nameservers respond 0/10

Some nameservers does not respond:
2a02:2b88:1:1::2

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 4 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
wedos.wedos.com
Serial
2018052202
Refresh
3600
Retry
1800
Expire
2592000
TTL
3600

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 2018052202 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: ns.wedos.net That server is listed at the parent servers, which is correct.

Serial value 1/1

SUCCESS SOA serial number is: 2018052202 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 : 1800 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 0/1

WARNING SOA Expire time is : 2592000 seconds. This seems too big;. (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 : 3600 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 servismanager.cz
lookup servismanager.cz at A.ROOT-SERVERS.NET(198.41.0.4) 13 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to a.ns.nic.cz(194.0.12.1)
lookup servismanager.cz at a.ns.nic.cz(194.0.12.1) 120 ms
a.ns.nic.cz(194.0.12.1) refer to ns.wedos.cz(46.28.104.67)
lookup servismanager.cz at ns.wedos.cz(46.28.104.67) 110 ms
got A record 'servismanager.cz IN A 31.31.79.48' from servismanager.cz(46.28.104.67)
Total time: 243 ms