By default NSLOOKUP command inquire the DNS server for type A records. DNS RECORD TYPE = MX: SHOWS TO DOMAIN MAIL SERVER Type set type = MX and press enter Now type webimprints.com In the above screen shot you see mail server. Nslookup, Ping, and Tracert with Mac OS X (NSLOOKUP) In Mac OS X, how do I find out the IP address or domain name of another networked device? In Mac OS X, to find the IP address or domain name of another networked device, use the Network Utility, which is installed in the Utilities folder, which in turn is inside the Applications folder. NetCrunch Tools is a completely free toolkit for network professionals, featuring Ping, Traceroute, Wake OnLAN, DNS Info, Who Is, Ping Scanner, Service Scanner, Open TCP Port Scanner, SNMP Scanner, DNS Audit and Mac Resolver in one. Network-Tools.com and NWTools.com are © 1998-2016| Privacy Policy| Contact Network-Tools.com The types of advertisements displayed are based on a number of factors.
The nslookup (which stands for name server lookup) command is a network utility program used to obtain information about internet servers. It finds name server information for domains by querying the Domain Name System.
Most computer operating systems include a built-in command line program with the same name. Some network providers also host web-based services of this same utility (like Network-Tools.com). These programs are all designed to perform name server lookups against specified domains.
How to Use nslookup in Windows
To use the Windows version of nslookup, open Command Prompt and type nslookup to get a result similar to this one but with entries for the DNS server and IP address that your computer is using:
This command identifies which DNS server the computer is currently configured to use for its DNS lookups. As the example shows, this computer is using an OpenDNS DNS server.
Take note of the small > at the bottom of the command's output. nslookup remains running in the background after the command is issued. The prompt at the end of the output lets you enter additional parameters. When you execute nslookup without specifying a domain name, the program enters interactive mode.
Set Server In Nslookup
Either type the domain name you want the nslookup details for or quit nslookup with the exit command (or the Ctrl+C keyboard shortcut). You could instead use nslookup by typing the command before the domain, all on the same line:
Here's an example output:
Nameserver Lookup
In DNS, so-called 'non-authoritative answers' refer to DNS records kept on external DNS servers, which they obtained from the 'authoritative' servers that provide the original source of the data.
Here's how to get that information (assuming you've already typed nslookup into Command Prompt):
An authoritative address lookup can be performed by specifying one of the domain's registered nameservers. Nslookup then uses that server instead of the default DNS server information of the local system.
The output no longer mentions 'non-authoritative' data because the nameserver ns1.p30.dynect is a primary nameserver for Lifewire.com, as listed in the 'NS record' portion of its DNS entries.
Mail Server Lookup
To search for mail server information on a particular domain, nslookup uses the MX record feature of DNS. Some sites, like Lifewire.com, support both primary and backup servers.
Mail server queries for Lifewire.com work like this:
Other nslookup Queries
Nslookup supports querying against other less commonly used DNS records including CNAME, PTR, and SOA. Typing a question mark at the prompt prints the program's help instructions.
Some web-based variations of the utility offer a few additional features beyond the standard parameters found within the Windows tool.
How to Use Online Nslookup Tools
Online nslookup utilities, like the one from Network-Tools.com, lets you customize a lot more than what's allowed with the command from Windows.
For example, after choosing the domain, server, and port, you can pick from a drop-down list of query types like address, nameserver, canonical name, start of authority, mailbox domain, mail group member, well-known services, mail exchange, ISDN address, NSAP address, and many others.
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You can also pick the query class; internet, CHAOS or Hesiod.
Tools like ping, traceroute, lookup, whois, finger, netstat, ipconfig, and port scanners are available on nearly every operating system you can get your hands on. They’re used for everything from troubleshooting a connection to looking up information.
Whether you’re using Windows, Linux, or Mac OS X, these tools are always close at hand. You’ll also find web-based versions of many of these utilities. Some are even available in Chrome OS’s hidden Crosh shell.
ping
RELATED:How To Troubleshoot Internet Connection Problems
The ping command sends ICMP echo request packets to a destination. For example, you could run ping google.com or ping 173.194.33.174 to ping a domain name or IP address.
These packets ask the remote destination to reply. If the remote destination is configured to reply, it will respond with packets of its own. You’ll be able to see how long the round-trip time is between your computer and the destination. You’ll see a “request timed out” message if packet loss is occurring, and you’ll see an error message if your computer can’t communicate with the remote host at all.
This tool can help you troubleshoot Internet connection problems, but bear in mind that many servers and devices are configured not to reply to pings.
Nslookup Mac Terminaltraceroute / tracert / tracepath
RELATED:How to Use Traceroute to Identify Network Problems
The traceroute, tracert, or tracepath command is similar to ping, but provides information about the path a packet takes. traceroute sends packets to a destination, asking each Internet router along the way to reply when it passes on the packet. This will show you the path packets take when you send them between your location and a destination.
This tool can help troubleshoot connection problems. For example, if you can’t communicate with a server, running traceroute may show you where the problem is occurring between your computer and the remote host.
ipconfig / ifconfig
RELATED:10 Useful Windows Commands You Should Know
The ipconfig command is used on Windows, while the ifconfig command is used on Linux, Mac OS X, and other Unix-like operating systems. These commands allow you to configure your network interfaces and view information about them.
For example, you can use the ipconfig /all command on Windows to view all your configured network interfaces, their IP addresses, DNS servers, and other information. Or, you can use the ipconfig /flushdns command to flush your DNS cache, forcing Windows to get new addresses from its DNS servers every time you contact a new hostname. Other commands can force your computer to release its IP address and get a new one from its DHCP server. This utility can quickly display your computer’s IP address or help you troubleshoot problems.
nslookup
RELATED:What Is DNS, and Should I Use Another DNS Server?
The nslookup command will look up the IP addresses associated with a domain name. For example, you can run nslookup howtogeek.com to see the IP address of How-To Geek’s server.
Your computer is constantly querying its DNS servers to translate domain names to IP addresses. This command just allows you to do it manually.
nslookup also allows you to perform a reverse lookup to find the domain name associated with an IP address. For example, nslookup 208.43.115.82 will show you that this IP address is associated with howtogeek.com.
whois
The whois command looks up the registration record associated with a domain name. This can show you more information about who registered and owns a domain name, including their contact information.
This command isn’t included with Windows itself, but Microsoft’s Windows Sysinternals provides a Whois tool you can download. This information is also available from many websites that can perform whois lookups for you.
netstat
netstat stands for network statistics. This command displays incoming and outgoing network connections as well as other network information. It’s available on Windows, Mac, and Linux — each version has its own command-line options you can tweak to see different types of information.
The netstat utility can show you the open connections on your computer, which programs are making which connections, how much data is being transmitted, and other information.
finger
The finger command is old and is no longer widely used. In theory, this command allows you to view information about users logged onto a remote computer. If the computer is running a finger service or daemon, you can use the finger command on your computer to see who’s logged in on that remote computer, their email address, and their full name. In practice, almost no computers are running a finger service you can connect to.
This utility was a cute idea in the early days of networking where you might want to see who was logged into the other few computers on your university network, but it’s not suitable for a dangerous internet. You don’t want people to see your full name and email address when you’re using a computer.
Still, the finger command lives on as a common network utility and is even still included in modern versions of Windows. Windows doesn’t include a finger service that can share this information with others, though.
Port Scan / nmap
The nmap utility is a common tool used for port scans, but there are many utilities that can run this sort of scan. A port scan is the process of attempting to connect to every port on a computer — ports 1 through 65535 — and seeing if they’re open. An attacker might port-scan a system to find vulnerable services. Or, you might port scan your own computer to ensure that there are no vulnerable services listening to the network.
These aren’t the only network-related commands, but they are some of the most common.
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