na-strychu.pl DNS Report

Health Score: 76%

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Checked: 3 months before

Parent

NS records at parent servers 

dns2.home.pl [ 46.242.149.20 46.242.149.21 ]
dns.home.pl [ 46.242.149.11 46.242.149.10 ]
[These were obtained from a-dns.pl.]

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. 
(dns.home.pl.		86400	IN	A	46.242.149.11) present at Parent, missing at (46.242.149.21, 46.242.149.10)
(dns.home.pl.		86400	IN	A	46.242.149.10) present at Parent, missing at (46.242.149.21, 46.242.149.10)
(dns2.home.pl.		86400	IN	A	46.242.149.20) present at Parent, missing at (46.242.149.21, 46.242.149.10)
(dns2.home.pl.		86400	IN	A	46.242.149.21) present at Parent, missing at (46.242.149.21, 46.242.149.10)

Nameservers A records 0/7

Some servers does not provide A records for nameservers. 
missing A record(s) for (dns.home.pl,dns3.home.pl,dns2.home.pl) at nameserver 46.242.149.21
missing A record(s) for (dns3.home.pl,dns.home.pl,dns2.home.pl) at nameserver 46.242.149.10

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 2/5

WARNING You have 2 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 0/7

DANGER There are nameservers not listed at the parent servers: 
dns3.home.pl.

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.home.pl
Serial
1538987684
Refresh
14400
Retry
7200
Expire
2419200
TTL
86400

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 1538987684 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: dns.home.pl That server is listed at the parent servers, which is correct.

Serial value 1/1

SUCCESS SOA serial number is: 1538987684 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 : 14400 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 : 7200 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 : 2419200 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 na-strychu.pl
lookup na-strychu.pl at A.ROOT-SERVERS.NET(198.41.0.4) 8 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to a-dns.pl(194.181.87.156)
lookup na-strychu.pl at a-dns.pl(194.181.87.156) 107 ms
a-dns.pl(194.181.87.156) refer to dns.home.pl(46.242.149.10)
lookup na-strychu.pl at dns.home.pl(46.242.149.10) 1 ms
got A record 'na-strychu.pl IN A 188.128.197.72' from na-strychu.pl(46.242.149.10)
Total time: 116 ms