msbdw.cn DNS Report

Health Score: 72%

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Checked: 3 months before

Parent

NS records at parent servers

v1s2.xundns.com
v1s1.xundns.com
[These were obtained from c.dns.cn.]

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 7/7

Skip glue checking. Make sure the nameservers domain is good standing Check xundns.com

Nameservers A records 0/7

Some servers does not provide A records for nameservers.
missing A record(s) for (v1s1.xundns.com,v1s2.xundns.com) at nameserver 14.29.32.139

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:
113.17.169.34

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 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
nsadmin.xundns.com
Serial
67677
Refresh
3600
Retry
600
Expire
604800
TTL
7200

Serial agreement 7/7

SUCCESS All your nameservers agree that your SOA serial number is 67677 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: v1s1.xundns.com That server is listed at the parent servers, which is correct.

Serial value 0/1

WARNING SOA serial number is: 67677 This not 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 : 600 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 : 7200 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 msbdw.cn
lookup msbdw.cn at A.ROOT-SERVERS.NET(198.41.0.4) 6 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to c.dns.cn(203.119.27.1)
lookup msbdw.cn at c.dns.cn(203.119.27.1) 110 ms
c.dns.cn(203.119.27.1) refer to v1s2.xundns.com(unknow IP)
extra IP lookup for v1s2.xundns.com at root server A.ROOT-SERVERS.NET(198.41.0.4)
lookup v1s2.xundns.com at A.ROOT-SERVERS.NET(198.41.0.4) 6 ms
A.ROOT-SERVERS.NET(198.41.0.4) refer to e.gtld-servers.net(192.12.94.30)
lookup v1s2.xundns.com at e.gtld-servers.net(192.12.94.30) 41 ms
e.gtld-servers.net(192.12.94.30) refer to v2s1.xundns.com(113.17.169.37)
lookup v1s2.xundns.com at v2s1.xundns.com(113.17.169.37) 368 ms
got A record 'v1s2.xundns.com IN A 116.10.184.143' from v1s2.xundns.com(113.17.169.37)
lookup msbdw.cn at v1s2.xundns.com(116.10.184.143) 361 ms
got A record 'msbdw.cn IN A 104.216.45.99' from msbdw.cn(116.10.184.143)
Total time: 892 ms