There are 5 different address classes. You can determine which class any IP
address is in by examining the first 4 bits of the IP address.
Class A addresses begin with 0xxx, or 1 to 126 decimal.
Class B addresses begin with 10xx, or 128 to 191 decimal.
Class C addresses begin with 110x, or 192 to 223 decimal.
Class D addresses begin with 1110, or 224 to 239 decimal.
Class E addresses begin with 1111, or 240 to 254 decimal.
There are three IP network addresses reserved for private networks. The
addresses are 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. They can be
used by anyone setting up internal IP networks, such as a lab or home LAN
behind a NAT or proxy server or a router. It is always safe to use these
because routers on the Internet will never forward packets coming from these
addresses. These addresses are defined in RFC 1918.
from: http://www.ralphb.net/IPSubnet/ipaddr.html
In summary, 192.168.0.0 is a private class C subnet with a maximum of 254
hosts or nodes (.0 and .255 are reservered as the network and broadcast
addresses respectively)
> -----Original Message-----
> From: DL Neil [mailto:[EMAIL PROTECTED]]
> Sent: Friday, March 08, 2002 11:55 AM
> To: LaserJetter
> Cc: [EMAIL PROTECTED]
> Subject: Re: [PHP-WIN] sendmail for windows
>
>
> LaserJetter,
>
> > Is 192.168.0.2 a valid IP address? I didn't know you could
> have a zero
> as
> > one of the elements.
>
> I'm not sure where this question came from, but ...
>
> Yes you can have a zero value in IP address octets.
> Obviously they all can't be zero.
> (I haven't researched it, but maybe the first cannot be zero)
> I suggest that 192.168.0.nnn must be THE most commonly used IP
> address/sub-net in the world!
>
> Regards,
> =dn
>
>
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