takming.edu.tw DNS Report

Health Score: 81%

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Checked: 1 day before

Parent

NS records at parent servers

dns.takming.edu.tw [ 203.64.253.146 ]
[These were obtained from b.twnic.net.tw.]

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.takming.edu.tw.	86400	IN	A	203.64.253.145) present at (203.64.253.146), missing at Parent
(dns.cc.takming.edu.tw.	86400	IN	A	192.192.141.6) present at (203.64.253.146), missing at Parent

Nameservers A records 7/7

SUCCESS Nameservers do include corresponding A records when asked for your NS records. This ensures that your DNS servers know the A records corresponding to all your NS records.

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 0/5

DANGER You have less then 2 nameservers, that may cause downtime

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:
dns.cc.takming.edu.tw.

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.takming.edu.tw
Serial
2020060101
Refresh
1800
Retry
900
Expire
604800
TTL
86400

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 2020060101 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.takming.edu.tw That server is listed at the parent servers, which is correct.

Serial value 1/1

SUCCESS SOA serial number is: 2020060101 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 : 1800 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 : 900 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 : 604800 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 takming.edu.tw
lookup takming.edu.tw at A.ROOT-SERVERS.NET(198.41.0.4) 10 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to g.dns.tw(220.229.225.195)
lookup takming.edu.tw at g.dns.tw(220.229.225.195) 219 ms
g.dns.tw(220.229.225.195) refer to c.twnic.net.tw(168.95.192.10)
lookup takming.edu.tw at c.twnic.net.tw(168.95.192.10) 201 ms
c.twnic.net.tw(168.95.192.10) refer to dns.takming.edu.tw(203.64.253.146)
lookup takming.edu.tw at dns.takming.edu.tw(203.64.253.146) 239 ms
RECORD does not exist
Total time: 669 ms