Bizarre decimal number to in-addr-arpa mapping......

[David T. Smith]

At 11:33 AM 6/2/99 -0500, Michael Fenton wrote:
>I discovered that people on my network are getting around
>our web filtering by using decimal number URL's.
>Check this out:
>gunk:~$ nslookup 3489040081
>Server:  server.tt.net
>Address:  209.98.124.2
>
>Name:    teen-space.com
>Address:  207.246.134.209
>
>How the hell does 3489040081 resolve?
3489040081 == 0xcff686d1
0xcf == 207
0xf6 == 246
0x86 == 134
0xd1 == 209

nslookup (and web browsers) will treat a decimal number as an IP
address without the dotted notation and resolve it.

>Thanks,
>Michael Fenton
>
>
You're welcome

DTS


D A V I D  T .   S M I T H 
Principal Consultant, Network Solutions 
__________________________________________ 
USWeb/CKS Corporation       http://www.uswebcks.com/ 
50 Washington Street 6th Floor
South Norwalk, CT 06854 
ph:  1 203 857 0080 
fax: 1 203 857 0082 
mailto: dsmith at uswebcks.com

USWeb/CKS - A Strategic Partner for the Information Age