Do you know about decimal formats and websites?

Over the years, you have learned that you can go to a website by simply typing the name of the website.  Such as –

http://www.wordpress.com

Did you know if you ping it, it will return the webserver’s address and you can use it to surf the web?

http://76.74.254.120

You can use this to troubleshoot your ISP.  How?  If your internet appears to be down, simple ping one of you favorite sites and then put the IP address into a browser.  If you can get to the website by doing this, more than likely your ISP’s DNS is down.

Now, did you know you can convert it to a decimal format and go to the website by typing the decimal value?

http://1279983224

As mysterious as this may seem, networking gets even more complex.  DNS entries determine the name resolution to IP address.   Webservers can be clustered and have different entries for the hundreds or even thousands of variations of naming conventions.

The network command NSLookup can be used to see these servers.   Example:  Go to a command prompt – type
NSLookup http://www.wordpress.com and you’ll see multiple servers.

C:\Users\raven>nslookup http://www.wordpress.com

Server: google-public-dns-a.google.com
Address: 8.8.8.8

Non-authoritative answer:
Name: lb.wordpress.com
Addresses: 76.74.254.123
72.233.69.6
66.155.11.238
66.155.9.238
76.74.254.120
72.233.2.58
Aliases: http://www.wordpress.com

If you ever get a decimal format in an email header and you wish to report the address as spam or as an abusive email, you can decoded it here.

To convert an IP address to a decimal format, use this site.

Here’s another small lesson using NSLookup.  Did you know you can find the email server’s information for more troubleshooting?  How?

First type nslookup and hit enter, then set the type by typing set type=mx and enter again.  Next type the website address and hit enter.

C:\Users\itisme>nslookup
Default Server: google-public-dns-a.google.com
Address: 8.8.8.8

> set type=mx
> ttcshelbyville.edu
Server: google-public-dns-a.google.com
Address: 8.8.8.8

Non-authoritative answer:
ttcshelbyville.edu MX preference = 10, mail exchanger = mail.ttcshelbyvill.edu
>

For more information on set type, visit Microsoft’s TechNet Library.

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About TCAT Shelbyville IT Department

The Tennessee College of Applied Technology - is one of 46 institutions in the Tennessee Board of Regents System, the seventh largest system of higher education in the nation. This system comprises six universities, fourteen community colleges, and twenty-six Applied Technology Colleges.
This entry was posted in Computer Security, Computers, Information Technology, Internet, network, Networking and tagged , , , . Bookmark the permalink.

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