Report for dazzlingdiamondschorus.org

OK. Found A records for all name servers.

• a.share-dns.com. → 172.64.53.25
• b.share-dns.net. → 172.64.52.239

To reach your name servers via IPv4 an A record is needed for each name server.

OK. All your name servers responded. We queried domain's records from all of your name servers and we received them successfully.

OK. No differences found. The glue provided by the parent name servers has to match the data provided by the authoritative name servers.

OK. Domain name servers are not allowing recursive queries. On all name servers which acts as caching name servers recursive queries should be restricted to local networks. Having open DNS servers can lead to abuses such as cache poisoning and DOS (denial of service) attacks. Cache poisoning attacks allows under certain conditions to redirect legitimate web traffic, email and other traffic to malicious hosts compromising security.

OK. Domain has 2 name servers. Recommended number, between 2 and 7 name servers (RFC 2182 recommends to have at least 3 authoritative name servers for domains).

OK. All your name servers reported identical NS records. Each name server should return identical NS records.

OK. No lame name servers found. All of your name servers are configured to be either master or slave for your domain.

OK. No private IPs found. Name servers using private IPs can't be reached from the Internet causing DNS delays.

OK. Found A records for each name servers.

• a.share-dns.com. → 172.64.53.25
• b.share-dns.net. → 172.64.52.239

To reach your name servers via IPv4 an A record is needed for each name server.

OK. All names are valid. Name server name should be a valid host name, no partial name or IP address.

OK. No stealth name servers found. All name servers returned by domain name servers should be listed at parent servers.

OK. No missing name servers found. All name servers returned by the parent name servers should have an NS record at your name servers.

OK. No CNAMEs found in NS records. RFC 2181, section 10.3 says that host name must map directly to one or more address record (A or AAAA) and must not point to any CNAME records. RFC 1034, section 3.6.2 says if a name appears in the right-hand side of RR (Resource Record) it should not appear in the left-hand name of CNAME RR, thus CNAME records should not be used with NS and MX records. Despite this restrictions, there are many working configuration using CNAME with NS and MX records.

OK. All name servers are allowing TCP connections. When response to a DNS query exceeds 512 bytes, TCP is negotiated and used, all name servers should allow TCP connections (port 53).

OK. Name servers are dispersed on 2 different C class networks:

• 172.64.52.0/24:
  • b.share-dns.net.
• 172.64.53.0/24:
  • a.share-dns.com.

Name servers should be dispersed (topologically and geographically) across the Internet to avoid risk of single point of failure (RFC 2182).

OK. Name servers software versions are not exposed:

• 172.64.52.239: "unknown"
• 172.64.53.25: "unknown"

Exposing name server's versions may be risky, when a new vulnerability is found your name servers may be automatically exploited by script kiddies until you patch the system. Learn how to hide version.