30888.com.tw DNS Report

Health Score: 84%

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Checked: 1 month before

Parent

NS records at parent servers

extdnsslave.fmcmotors.com.tw [ 210.59.242.7 ]
extdnsmaster.30888.com.tw [ 210.59.242.3 ]
extdnsmaster.fmcmotors.com.tw [ 210.59.242.3 ]
extdnsslave.30888.com.tw [ 210.59.242.7 ]
[These were obtained from h.dns.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.
(extdnsmaster.fmcmotors.com.tw.	3600	IN	A	210.59.242.3) present at Parent, missing at (210.59.242.7, 210.59.242.3)
(extdnsslave.fmcmotors.com.tw.	3600	IN	A	210.59.242.7) present at Parent, missing at (210.59.242.7, 210.59.242.3)

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 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 0/7

DANGER There are nameservers not listed at your nameservers:
extdnsslave.fmcmotors.com.tw.
extdnsmaster.fmcmotors.com.tw.

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
H0142.30888.com.tw
Serial
2020063001
Refresh
86400
Retry
86400
Expire
1209600
TTL
86400

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 2020063001 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: extdnsmaster.30888.com.tw That server is listed at the parent servers, which is correct.

Serial value 1/1

SUCCESS SOA serial number is: 2020063001 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 0/1

WARNING SOA Retry interval is : 86400 seconds. This seems too big;. (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 0/1

WARNING SOA Retry interval is : 86400 seconds. This seems too big;. (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 : 1209600 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 30888.com.tw
lookup 30888.com.tw at A.ROOT-SERVERS.NET(198.41.0.4) 2 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to a.dns.tw(203.73.24.25)
lookup 30888.com.tw at a.dns.tw(203.73.24.25) 200 ms
a.dns.tw(203.73.24.25) refer to h.twnic.net.tw(163.28.4.10)
lookup 30888.com.tw at h.twnic.net.tw(163.28.4.10) 223 ms
h.twnic.net.tw(163.28.4.10) refer to extdnsslave.30888.com.tw(210.59.242.7)
lookup 30888.com.tw at extdnsslave.30888.com.tw(210.59.242.7) 215 ms
RECORD does not exist
Total time: 640 ms