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Linux nslookup command help and examples. Updated: 0. 7/2. 0/2.

Computer Hope. About nslookup. The nslookup command is used to query internet name servers interactively for information. Overviewnslookup, which stands for . For instance, to find out what the IP address of microsoft.

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Server: 8. 8. 8. Address: 8. 8. 8. Non- authoritative answer. Name: microsoft.

Address: 1. 34. 1. Name: microsoft. Address: 1. 34. 1. Here, 8. 8. 8. 8 is the address of our system's Domain Name Server. This is the server our system is configured to use to translate domain names into IP addresses.

Our name server returned two entries, 1. This indicates that microsoft. When you access micrsoft. You can see that we have received a . An answer is . More often, our DNS will have a cache of information representing the last authoritative answer it received when it made a similar query; this information is passed on to you, but the server qualifies it as .

For instance, the command: nslookup 1. Server: 8. 8. 8.

Address: 8. 8. 8. Non- authoritative answer.

You can query a domain's NS Record using the option - type=ns, like this: nslookup - type=ns microsoft. Server: 8. 8. 8. Address: 8. 8. 8. Non- authoritative answer.

If there is an available source for authoritative answers, it is listed at the bottom of the output. Querying The MX Record. The MX Record is a map of mail exchange servers for a domain. When you send email to a domain, for example . For example: nslookup - type=mx microsoft. Server: 8. 8. 8.

Address: 8. 8. 8. Non- authoritative answer. If there were more than one mail exchanger, they would each have a different number, with the lower numbers representing a higher priority. So if there were another exchanger with the prefix 5, that server would take precedence over the server listed here. Querying The SOA Record. The SOA (. It can be queried with the option - type=soa. Server: 8. 8. 8.

Authoritative answers can be found from: The information listed here is the cached version held by our domain name server. It includes: origin: The authority from which the information originated.

The email address of the domain administrator (The first dot would be an @ symbol in an email address, so here the email address is . Here, the information is current as of August 1. A number representing the interval, in seconds, after which the secondary name server will check the primary name server for an updated revision of this information. This information tells us that the secondary Microsoft name server's information is never more than two hours (7.

The secondary nameserver will wait this many seconds before attempting to reconnect to the primary name server after a failed attempt. The secondary nameserver's cache of the primary nameserver's information will always be considered invalid after this many seconds. The secondary nameserver's cache of the primary nameserver's information should not be refreshed if this amount of time has not elapsed since the last refresh. Viewing All Available NS Records. We can also view all available NS records for a domain by using the option - type=any.

For example: nslookup - type=any microsoft. Server: 8. 8. 8. Address: 8. 8. 8.

Non- authoritative answer. Name: microsoft. Address: 1. 34. 1. Name: microsoft. Address: 1. 34. 1.

You can specify a custom DNS to query, however, by specifying it on the command line. For example: nslookup microsoft.

Server: ns. 1. msft. Address: 6. 5. 5.

Name: microsoft. Address: 1. 34. 1.

This is useful not only for obtaining authoritative information, but for finding out exactly what information a certain DNS currently has cached. Querying On A Non- Standard Port. By default, domain name servers accept queries on port 5. If this is configured differently on the server you are trying to query, you can specify another port number using the - port= option: nslookup - port=5. Here, the query attempt failed because our DNS uses the standard port, number 5. Debugging The Query Transaction. Advanced users may need to examine more closely the details of the query transaction.

This can be achieved using the - debug option: nslookup - debug microsoft. Server: 8. 8. 8. Address: 8. 8. 8. A, class = IN. - > microsoft. AUTHORITY RECORDS.

ADDITIONAL RECORDS. Non- authoritative answer. Name: microsoft. Address: 1. 34. 1. Name: microsoft. Address: 1. 34. 1. Interactive Mode.

You can also run multiple commands interactively by running nslookup with no options: nslookup. This will bring you to a special command prompt where you can use commands to perform any of the operations listed above. It will look like this: > At this prompt, you can simply type in a domain name or IP address to query your DNS for its basic information: > microsoft. Server: 8. 8. 8.

Address: 8. 8. 8. Non- authoritative answer. Name: microsoft. Address: 1. 34. 1. Name: microsoft. Address: 1. 34. 1.

For instance, these two commands are the equivalent of running nslookup - type=any microsoft. Server: 8. 8. 8. Address: 8. 8. 8. Non- authoritative answer. Name: microsoft. Address: 1. 34. 1.

Name: microsoft. Address: 1. 34. 1. Interactive mode allows the user to query name servers for information about various hosts and domains or to print a list of hosts in a domain. Non- interactive mode is used to print just the name and requested information for a host or domain. Arguments. Interactive mode is entered in the following cases: when no arguments are given (the default name server will be used)when the first argument is a hyphen (. The optional second argument specifies the host name or address of a name server, to be used instead of the system's default DNS.

Options. Options can be specified on the command line if they precede the arguments and are prefixed with a hyphen. For example, to change the default query type to host information, and the initial timeout to 1. The name of the option corresponds to the keyword of the set command. See below for a description of these keywords, and their available settings. Interactive Commandshost . If host is an Internet address and the query type is A or PTR, the name of the host is returned.

If host is a name and does not have a trailing period, the search list is used to qualify the name. To look up a host not in the current domain, append a period to the name. If an authoritative answer can't be found, the names of servers that might have the answer are returned. Exits the program. Valid keywords are: all. Prints the current values of the frequently used options to set. Information about the current default server and host is also printed.

Change the query class to one of: INthe Internet class. CHthe Chaos class. HSthe Hesiod class.

ANYwildcard. The class specifies the protocol group of the information.(Default = IN; abbreviation = cl) . This displays more about what nslookup is doing.(Default = nod. Sets the search list to name. This file is managed using the command line program resolvconf. Deprecationnslookup was briefly classified as . They later reversed this decision, but it's important to note that host and dig can provide you with the same functions as nslookup, at a somewhat higher level of industry acceptance.

Perform a reverse lookup of the IP address 2. Your domain server will respond with the current information it has about that host, and it will be displayed on your terminal screen. Output will resemble the following. Server: 8. 8. 8. Address: 8. 8. 8. Non- authoritative answer.

Output will resemble the following. Server: 8. 8. 8. Address: 8. 8. 8. Non- authoritative answer. Output will resemble the following. Server: 8. 8. 8. Address: 8. 8. 8.

Non- authoritative answer. Name: google. com. Address: 7. 4. 1.

Name: google. com. Address: 7. 4. 1. Name: google. com. Address: 7. 4. 1. Name: google. com.

Address: 7. 4. 1. Name: google. com. Address: 7. 4. 1. Name: google. com. Address: 7. 4. 1.

Name: google. com. Download Sally Salon Untuk Pc Richards. Address: 7. 4. 1. Name: google. com. Address: 7. 4. 1. Name: google. com. Address: 7. 4. 1. Name: google. com.