Name Server Lookup Tool Description

• Simple Query. This uses the operating system's networking resolver to do a DNS query. It takes an IPv4 address or hostname and queries your default name server(s) for the translation. It also attempts to determine NetBIOS computer names if your DNS fails to respond to an IP address query--provided your computer and the target computer are both set up to do NetBIOS over TCP/IP.
  
  
   
• Who Am I? This button asks queries your networking subsystem for your computer name. Then it uses that name to obtain the IP addresses and any aliases assigned to your computer. It also shows a list of default name servers.
  
  
   
• Test Default Servers. This tool takes an IP address or hostname and tests the A or PTR record resolution for each name server IP address assigned to your computer. This assignment either occurs via DHCP or is statically assigned. Either way it tells you if each DNS is working or communicating properly when a standard name resolution query is made by any internet enabled program.
  
  
   
• NSLOOKUP. This feature functions like the UNIX command line nslookup program. It uses the parameters specified in Setup to define which records are requested from DNS. Unlike Simple Query, you can specify exactly which DNS server to use with your NSLOOKUP, AXFR, or DIG queries. We support 43 record types including the popular A, ANY, CNAME, MX, NS, PTR, SOA, and TXT types. A typical 'ANY' query result is shown below:
  
  
   
• List Domain. List Domain is actually a Zone Transfer or AXFR utility. The purpose of this utility is to make a TCP connection to DNS and request a zone (list of records) for a domain. List Domain attempts to automatically locate the Authoritative host to make the transfer possible. Security DNS server will not allow you to list the hosts via zone transfer unless you are on an approved IP address list.
   
  
   
• Dig or Domain Information Groper is similar in functionality to NSLOOKUP, however, it provides much more detailed information. We have provided DIG and DIG with a zone transfer.  Due to security concerns most domains will not allow you to list the hosts via zone transfer unless you are on an approved IP address list.
  
  
   
• DNS Verify takes an IP address and does a reverse lookup on it to find the hostname. Then it takes the hostname and translates it back to an IP address. If the IP addresses match, the DNS records verified. There is a batch version of this tool included as part of the HyperTrans tool.
  
  
   
• IP Drilldown is a tool for determining all the responsible name servers (and also the company names) of an IPv4 address. It uses the selected DNS to query in ARPA namespace for each class D, C, B and A.
  
  
   
• ENUM. This feature in Name Server Lookup accepts a fully qualified telephone number beginning with the country code and returns any records maintained by the end user in the ENUM registry in the public domain e164.arpa (or any other root you choose).
   

  Example (parts of this query have been altered to protect the privacy of the phone number owner. The phone number is fictitious.)

  [Start Queries]
  Processing Telephone Number [+420596987654]

  [Query in ENUM NAPTR namespace for 4.5.6.7.8.9.6.9.5.0.2.4.e164.arpa]

  Server:  unknown_server_name
  Address:  208.200.248.1

  Non-authoritative answer:
  4.5.6.7.8.9.6.9.5.0.2.4.e164.arpa                NAPTR        order = 200, preference = 50
         flags = "u"
         services = "E2U+h323"
         rule = "!^\+(.*)$!h323:\1@xyzext.samplecompany.cz!"
         replacement = (root)

  4.5.6.7.8.9.6.9.5.0.2.4.e164.arpa                NAPTR        order = 100, preference = 50
         flags = "u"
         services = "E2U+sip"
         rule = "!^\+(.*)$!sip:\samplecompany.cz!"
         replacement = (root)

  Authoritative answers can be found from:
  8.9.6.9.5.0.2.4.e164.arpa                NS          nameserver = ns.samplecompany.cz
  8.9.6.9.5.0.2.4.e164.arpa                NS          nameserver = ns.samplecompany.net
  ns.samplecompany.net                A           internet (IPv4) address = 255.254.253.233

  [End Query]

   

• Setup. This is used to define the many types of NSLOOKUP or DIG record queries you will be making. It also controls filtering on Zone Transfers (List Domain). Specify the name server you will be using here.
   
  

Windows Vista compatibility: Fully functional as of v10.42.

Screenshot of the Tool