fh-salzburg.ac.at DNS Report

Health Score: 75%

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Checked: 3 months before

Parent

NS records at parent servers

ns5.univie.ac.at [ 193.171.255.77 ]
ns1.fh-salzburg.ac.at [ 193.170.110.24 ]
ns0.fh-salzburg.ac.at [ 193.170.110.23 ]
[These were obtained from d.ns.at.]

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.
(ns5.univie.ac.at.	10800	IN	A	193.171.255.77) present at Parent, missing at (193.170.110.24, 193.170.110.23)

Nameservers A records 0/7

Some servers does not provide A records for nameservers.
missing A record(s) for (ns5.univie.ac.at) at nameserver 193.170.110.24
missing A record(s) for (ns5.univie.ac.at) at nameserver 193.170.110.23

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:
2001:628:453:4305::53

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
domain-admin.fh-salzburg.ac.at
Serial
2019061101
Refresh
3600
Retry
1800
Expire
28800
TTL
10800

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 2019061101 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: ns0.fh-salzburg.ac.at That server is listed at the parent servers, which is correct.

Serial value 1/1

SUCCESS SOA serial number is: 2019061101 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 : 28800 seconds. This seems too small. (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 : 10800 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 fh-salzburg.ac.at
lookup fh-salzburg.ac.at at A.ROOT-SERVERS.NET(198.41.0.4) 79 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to d.ns.at(81.91.161.98)
lookup fh-salzburg.ac.at at d.ns.at(81.91.161.98) 85 ms
d.ns.at(81.91.161.98) refer to ns5.univie.ac.at(193.171.255.77)
lookup fh-salzburg.ac.at at ns5.univie.ac.at(193.171.255.77) 104 ms
got A record 'fh-salzburg.ac.at IN A 193.170.110.54' from fh-salzburg.ac.at(193.171.255.77)
Total time: 268 ms