please define terms

[Michael Dillon]

On Mon, 20 Jan 1997, Larry Honig wrote:

> I'm sorry to brutally expse my ignorance of terms, but I may not be the
> only neophyte here so I will do it anyway. What exactly is meant by /24,
> /19, /xx??

An IP address is a 32 bit number. If you use the first 24 bits for the
network address that refers to a specific ISP then this ISP has a /24
address block. If you use the first 19 bits .... this ISP has a /19.
The largest size block being allocated is a /8

> like to allocate (in IPv4 syntax) all the numbers between (for example -
> not a real sequence) 99.128.51.0 and 99.128.51.255?

That's a /24. For examples you are supposed to use 192.0.2/24 although
10/8 is OK too. I.e. 192.0.2.0 through 192.0.2.255 or 10.0.0.0 through
10.255.255.255.

> Also, under IPv6 how would this look?

This is an utterly different animal and really only in use currently by
researchers who tunnel it through IPv4 on the experimental 6bone.

Michael Dillon                   -               Internet & ISP Consulting
Memra Software Inc.              -                  Fax: +1-250-546-3049
http://www.memra.com             -               E-mail: michael at memra.com