These are defintely routable. They are just not useful as internet = routable. That is becuase no one is registered to use those numbers. = They are considered private addresses according to the 1597 RFC. Plus = check out 1918 too I think. The Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of the IP address space for private networks: 10.0.0.0 - 10.255.255.255 (Class A) 172.16.0.0 - 172.31.255.255 (Class B) 192.168.0.0 - 192.168.255.255 (Class C) You can even subnet and supernet them too. If you have a large network = that is subneted or using vlans, you can route between networks using = these numbers. Even though the numbers are in a private address space = all the IP rules still apply. Ray, since most local subnets are class C in size, it is a very commonly = seen scheme. For those that are interested in more details: http://www.faqs.org/rfcs/rfc1597.html Ken -----Original Message----- From: Costanzo, Ray [mailto:rcostanzo@xxxxxxxxxxx] Sent: Monday, November 18, 2002 8:59 AM To: windows2000@xxxxxxxxxxxxx Subject: [windows2000] 192.168.*.* - why? Hi list, I'm just curious about something. It seems that most networks use 192.168.*.* for their internal addresses. Why? It doesn't really matter, does it? Isn't 192.168.*.* completely arbitrary? My theory on how this came to be the norm is that MS used those addresses in some samples in some books or something, and people started using that and it just became the norm. But then there's that whole Internet connection sharing feature that came out in what, W98SE? With that, the computer that's sharing its Internet connection will be 192.168.1.1. So, I imagine that it's coded somewhere into other OS'es to look to see if 192.168.1.1 can be used as a gateway when the user does not specify an IP configuration. So what came first? 192.168.*.* or computers looking to 192.168.1.1 as a gateway? Or what my real question is is why 192.168.*.*? Thanks, Ray at work ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com ********************************************************************** =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D To Unsubscribe, set digest or vacation mode or view archives use the below link. http://thethin.net/win2000list.cfm ================================== To Unsubscribe, set digest or vacation mode or view archives use the below link. http://thethin.net/win2000list.cfm