Leung, Michael <Michael.Leung@networksolutions.com> wrote:
>
> It looks like the first one was converted
>
> Original New
> 146.115.44.11 146-115-44-11.c3-0.sbo-ubr1.sbo.ma.cable.rcn.com
> 125.17.144.210 axcend.com
>
> The second one seems right, but the first one looks a little odd to
> me.
C:\>ping -a 146.115.44.11
Pinging 146-115-44-11.c3-0.sbo-ubr1.sbo.ma.cable.rcn.com [146.115.44.11] with 32 bytes of data: ....
Consumer ISPs often include the actual number in the DNS name that they record for each address. They have to have something to distinguish each entry in the "host" field, and for privacy reasons they wouldn't want to use the customers name or account info, and they often use overlapping pools of numbers, so the "geographic" part of the name doesn't necessarily map into a specific subnet. So you end up with something like 146-115-44-11.c3-0.sbo-ubr1.sbo.ma.cable.rcn.com. It makes sense to someone at rcn.com.
Aengus
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>
> It looks like the first one was converted
>
> Original New
> 146.115.44.11 146-115-44-11.c3-0.sbo-ubr1.sbo.ma.cable.rcn.com
> 125.17.144.210 axcend.com
>
> The second one seems right, but the first one looks a little odd to
> me.
C:\>ping -a 146.115.44.11
Pinging 146-115-44-11.c3-0.sbo-ubr1.sbo.ma.cable.rcn.com [146.115.44.11] with 32 bytes of data: ....
Consumer ISPs often include the actual number in the DNS name that they record for each address. They have to have something to distinguish each entry in the "host" field, and for privacy reasons they wouldn't want to use the customers name or account info, and they often use overlapping pools of numbers, so the "geographic" part of the name doesn't necessarily map into a specific subnet. So you end up with something like 146-115-44-11.c3-0.sbo-ubr1.sbo.ma.cable.rcn.com. It makes sense to someone at rcn.com.
Aengus
+------------------------------------------------------------------------
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| Usenet version: news://news.gmane.org/gmane.comp.web.analog.general
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